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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

​

​ | ​ | ​
☒ |  | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

​

For the quarterly period ended September 30, 2025

OR

​

​ | ​ | ​
☐ |  | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

​

For the transition period from ________ to ________

Commission File Number: 001-39413

VERTEX, INC.

(Exact Name of Registrant as Specified in its Charter)

​

​ | ​ | ​ | ​ | ​
Delaware |  |  |  | 23-2081753
(State or other jurisdiction of incorporation or organization) | ​ |  | ​ | (I.R.S. Employer Identification No.)
| ​ |  | ​ |
2301 Renaissance Blvd King of Prussia, Pennsylvania | ​ |  | ​ | 19406
(Address of principal executive offices) | ​ |  | ​ | (Zip Code)

​

Registrant’s telephone number, including area code: (800) 355-3500

Securities registered pursuant to Section 12(b) of the Act:

​

​ | ​ | ​ | ​ | ​
Title of each class |  | Trading symbol |  | Name of each exchange on which registered
Class A Common Stock, Par Value $0.001 Per Share | ​ | VERX | ​ | The Nasdaq Stock Market LLC

​

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

​

​ | ​ | ​ | ​ | ​
Large accelerated filer | ☒ |  | Accelerated filer | ☐
Non-accelerated filer | ☐ | ​ | Smaller reporting company | ☐
​ | ​ | ​ | Emerging growth company | ☐

​

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of October 30, 2025, the registrant had 77,372,323 shares of Class A common stock, $0.001 par value per share, and 82,155,641 shares of Class B common stock, $0.001 par value per share, outstanding.

​

​

​

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TABLE OF CONTENTS

​

​ |  | Page
​ | Part I - Financial Information | ​
Item 1. | Financial Statements | ​
​ | Condensed Consolidated Balance Sheets as of September 30, 2025 (unaudited) and December 31, 2024 | 5
​ | Condensed Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2025 and 2024 (unaudited) | 6
​ | Condensed Consolidated Statements of Changes in Stockholders’ Equity for the Three and Nine Months Ended September 30, 2025 and 2024 (unaudited) | 7
​ | Condensed Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2025 and 2024 (unaudited) | 9
​ | Notes to Condensed Consolidated Financial Statements (unaudited) | 10
Item 2. | Management’s Discussion and Analysis of Financial Condition and Results of Operations | 35
Item 3. | Quantitative and Qualitative Disclosures About Market Risk | 58
Item 4. | Controls and Procedures | 59
| Part II - Other Information | 60
Item 1. | Legal Proceedings | 60
Item 1A. | Risk Factors | 60
Item 2. | Unregistered Sales of Equity Securities and Use of Proceeds | 60
Item 3. | Defaults Upon Senior Securities | 60
Item 4. | Mine Safety Disclosures | 60
Item 5. | Other Information | 60
Item 6. | Exhibits | 61
| Signatures | 62

​

​

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements made in this Quarterly Report on Form 10-Q that are not statements of historical fact, including statements about our beliefs and expectations and regarding future events or our future results of operations, financial condition, business, strategies, financial needs, the plans and objectives of management, and our stock repurchase program are forward-looking statements and should be evaluated as such. These statements often include words such as “anticipate,” “believe,” “expect,” “suggests,” “plans,” “intend,” “estimates,” “targets,” “projects,” “should,” “could,” “would,” “may,” “will,” “forecast,” and other similar expressions or the negatives of those terms. We base these forward-looking statements on our current expectations, plans, and assumptions that we have made in light of our experience in the industry, as well as our perceptions of historical trends, current conditions, expected future developments and other factors we believe are appropriate under the circumstances at such time. As you read and consider this Quarterly Report on Form 10-Q, you should understand that these statements are not guarantees of future performance or results. The forward-looking statements are subject to and involve risks, uncertainties and assumptions, and you should not place undue reliance on these forward-looking statements. Although we believe that these forward-looking statements are based on reasonable assumptions at the time they are made, you should be aware that many factors could affect our actual results or results of operations and could cause actual results to differ materially from those expressed in the forward-looking statements. Important factors that may materially affect such forward-looking statements include, but are not limited to:

| ● | our ability to maintain and grow revenue from existing customers and new customers, and expand their usage of our solutions;

| ● | our ability to maintain and expand our strategic relationships with third parties;

| ● | our ability to adapt to technological change and successfully introduce new solutions or provide updates to existing solutions;

| ● | risks related to failures in information technology or infrastructure;

| ● | challenges in using and managing use of Artificial Intelligence (“AI”) in our business;

| ● | incorrect or improper implementation, integration or use of our solutions;

| ● | failure to attract and retain qualified technical and tax-content personnel;

| ● | competitive pressures from other tax software and service providers and challenges of convincing businesses using native enterprise resource planning functions to switch to our software;

| ● | our ability to accurately forecast our revenue and other future results of operations based on recent success;

| ● | our ability to offer specific software deployment methods based on changes to customers’ and partners’ software systems;

| ● | our ability to continue making significant investments in software development and equipment;

| ● | our ability to sustain and expand revenues, maintain profitability, and to effectively manage our anticipated growth;

| ● | our ability to successfully diversify our solutions by developing or introducing new solutions or acquiring and integrating additional businesses, products, services, or content;

| ● | our ability to successfully integrate acquired businesses and to realize the anticipated benefits of such acquisitions;

| ● | risks related to the fluctuations in our results of operations;

| ● | risks related to our expanding international operations;

| ● | our exposure to liability from errors, delays, fraud or system failures, which may not be covered by insurance;

| ● | our ability to adapt to organizational changes and effectively implement strategic initiatives;

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| ● | risks related to our determinations of customers’ transaction tax and tax payments;

| ● | risks related to changes in tax laws and regulations or their interpretation or enforcement;

| ● | our ability to manage cybersecurity and data privacy risks;

| ● | our involvement in material legal proceedings and audits;

| ● | risks related to undetected errors, bugs or defects in our software;

| ● | risks related to utilization of open-source software, business processes and information systems;

| ● | risks related to failures in information technology, infrastructure, and third-party service providers;

| ● | our ability to effectively protect, maintain, and enhance our brand;

| ● | changes in application, scope, interpretation or enforcement of laws and regulations;

| ● | global economic weakness and uncertainties, including the economic uncertainty created by the changing legal, regulatory, or taxation landscape in the United States, and disruption in the capital and credit markets;

| ● | business disruptions related to natural disasters, epidemic outbreaks, including a global endemic or pandemic, terrorist acts, political events, or other events outside of our control;

| ● | our ability to comply with anti-corruption, anti-bribery, and similar laws;

| ● | our ability to protect our intellectual property;

| ● | changes in interest rates, security ratings and market perceptions of the industry in which we operate, or our ability to obtain capital on commercially reasonable terms or at all;

| ● | our ability to maintain an effective system of disclosure controls and internal control over financial reporting, or ability to remediate any material weakness in our internal controls;

| ● | risks related to our Class A common stock and controlled company status;

| ● | risks related to our indebtedness and adherence to the covenants under our debt instruments;

| ● | the effects of the Capped Call Transactions (as defined in the notes to the financial statements) and the actions of the Option Counterparties (as defined in the notes to the financial statements) and/or their respective affiliates;

| ● | any statements of belief and any statements of assumptions underlying any of the foregoing; and

| ● | other factors beyond our control.

The risks included here are not exhaustive, and additional factors could adversely affect our business and financial performance, including factors and risks included in our Annual Report on Form 10-K for the year ended December 31, 2024, filed with the Securities and Exchange Commission (the “SEC”) on February 27, 2025 (the “2024 Annual Report”). Moreover, we operate in a very competitive and rapidly changing environment. New risk factors emerge from time to time, and it is not possible for us to identify all such risk factors, nor can we assess the impact of all such risk factors on the business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. Given these risks and uncertainties, you should not place undue reliance on our forward-looking statements, and you should not rely on forward-looking statements as predictions of future events. The results, events, and circumstances reflected in the forward-looking statements may not be achieved or occur, and actual results, events, or circumstances could differ materially from those described in the forward-looking statements. The forward-looking statements made in this Quarterly Report on Form 10-Q speak only as of the date of this report. We undertake no obligation to update any forward-looking statements made in this report to reflect events or circumstances after the date of this report or to reflect new information or the occurrence of unanticipated events, except as required by law. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements.

​

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PART I - FINANCIAL INFORMATION

​

Item 1. FINANCIAL STATEMENTS

​

Vertex, Inc. and Subsidiaries

Condensed Consolidated Balance Sheets

As of September 30, 2025 and December 31, 2024

(Amounts in thousands, except per share data)

​

​ | ​ | ​ | ​ | ​ | ​
​ | September 30, |  | December 31,
​ | 2025 | ​ | 2024
​ | (unaudited) |  | ​ | ​
Assets | ​ | ​ | ​ | ​ | ​
Current assets: | ​ |  |  | ​ | ​
Cash and cash equivalents | $ | 313,506 | ​ | $ | 296,051
Funds held for customers |  | 25,287 | ​ |  | 30,015
Accounts receivable, net of allowance of $15,069 and $16,838, respectively |  | 131,502 | ​ |  | 164,432
Prepaid expenses and other current assets |  | 48,532 | ​ |  | 36,678
Investment securities available-for-sale, at fair value (amortized cost of $0 and $9,147, respectively) | ​ | — | ​ | ​ | 9,157
Total current assets |  | 518,827 | ​ |  | 536,333
Property and equipment, net of accumulated depreciation |  | 202,655 | ​ |  | 177,559
Capitalized software, net of accumulated amortization |  | 35,917 | ​ |  | 36,350
Goodwill and other intangible assets |  | 396,997 | ​ |  | 363,021
Deferred commissions |  | 28,812 | ​ |  | 27,480
Deferred income tax asset | ​ | 22 | ​ | ​ | 19
Operating lease right-of-use assets | ​ | 10,496 | ​ | ​ | 11,956
Long-term investment | ​ | 15,000 | ​ | ​ | —
Other assets |  | 13,132 | ​ |  | 14,073
Total assets | $ | 1,221,858 | ​ | $ | 1,166,791
Liabilities and Stockholders' Equity |  | ​ | ​ |  | ​
Current liabilities: |  |  | ​ |  |
Accounts payable | $ | 35,374 | ​ | $ | 36,215
Accrued expenses |  | 39,788 | ​ |  | 35,169
Customer funds obligations |  | 22,904 | ​ |  | 27,406
Accrued salaries and benefits |  | 23,729 | ​ |  | 14,581
Accrued variable compensation |  | 29,101 | ​ |  | 45,507
Deferred revenue, current |  | 333,636 | ​ |  | 339,326
Current portion of operating lease liabilities | ​ | 4,236 | ​ | ​ | 3,995
Current portion of finance lease liabilities | ​ | 71 | ​ | ​ | 77
Purchase commitment and contingent consideration liabilities, current |  | 27,100 | ​ |  | 35,100
Total current liabilities |  | 515,939 | ​ |  | 537,376
Deferred revenue, net of current portion |  | 5,407 | ​ |  | 4,840
Debt, net of current portion | ​ | 336,913 | ​ | ​ | 335,220
Operating lease liabilities, net of current portion | ​ | 10,093 | ​ | ​ | 12,585
Finance lease liabilities, net of current portion | ​ | 61 | ​ | ​ | 10
Purchase commitment and contingent consideration liabilities, net of current portion |  | 79,000 | ​ |  | 87,400
Deferred income tax liabilities | ​ | 7,950 | ​ | ​ | 9,918
Deferred other liabilities |  | 2,023 | ​ |  | 90
Total liabilities |  | 957,386 | ​ |  | 987,439
Commitments and contingencies (Note 12) |  |  | ​ |  |
Stockholders' equity: |  |  | ​ |  |
Preferred shares, $0.001 par value, 30,000 shares authorized; no shares issued and outstanding | ​ | — | ​ |  | —
Class A voting common stock, $0.001 par value, 300,000 shares authorized; 77,315 and 70,670 shares issued and outstanding, respectively | ​ | 77 | ​ | ​ | 71
Class B voting common stock, $0.001 par value, 150,000 shares authorized; 82,156 and 86,481 shares issued and outstanding, respectively | ​ | 82 | ​ | ​ | 86
Additional paid in capital | ​ | 304,177 | ​ | ​ | 278,389
Accumulated deficit |  | (39,101) | ​ |  | (53,315)
Accumulated other comprehensive loss |  | (763) | ​ |  | (45,879)
Total stockholders' equity |  | 264,472 | ​ |  | 179,352
Total liabilities and stockholders' equity | $ | 1,221,858 | ​ | $ | 1,166,791
​

The accompanying notes are an integral part of these condensed consolidated financial statements.

​

5

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Vertex, Inc. and Subsidiaries

Condensed Consolidated Statements of Comprehensive Income

For the three and nine months ended September 30, 2025 and 2024 (unaudited)

(Amounts in thousands, except per share data)

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three months ended September 30, | ​ | Nine months ended September 30,
​ | 2025 | ​ | 2024 | ​ | 2025 | ​ | 2024
​ | (unaudited) | ​ | (unaudited)
Revenues: | ​ |  |  | ​ |  |  | ​ | ​ |  | ​ | ​
Software subscriptions | $ | 164,824 | ​ | $ | 146,254 | ​ | $ | 473,429 | ​ | $ | 414,527
Services | ​ | 27,288 | ​ |  | 24,181 | ​ | ​ | 80,304 | ​ | ​ | 73,793
Total revenues |  | 192,112 | ​ |  | 170,435 | ​ | ​ | 553,733 | ​ |  | 488,320
Cost of revenues: |  | ​ | ​ |  |  | ​ | ​ | ​ | ​ | ​ | ​
Software subscriptions |  | 50,034 | ​ |  | 43,641 | ​ | ​ | 138,738 | ​ | ​ | 131,030
Services |  | 20,762 | ​ |  | 16,270 | ​ | ​ | 59,485 | ​ | ​ | 48,286
Total cost of revenues |  | 70,796 | ​ |  | 59,911 | ​ | ​ | 198,223 | ​ |  | 179,316
Gross profit |  | 121,316 | ​ |  | 110,524 | ​ | ​ | 355,510 | ​ |  | 309,004
Operating expenses: |  | ​ | ​ |  |  | ​ | ​ | ​ | ​ | ​ | ​
Research and development |  | 19,929 | ​ |  | 15,621 | ​ | ​ | 61,397 | ​ | ​ | 47,080
Selling and marketing |  | 47,385 | ​ |  | 42,111 | ​ | ​ | 143,994 | ​ | ​ | 123,143
General and administrative |  | 44,609 | ​ |  | 41,499 | ​ | ​ | 133,029 | ​ | ​ | 112,915
Depreciation and amortization |  | 6,372 | ​ |  | 5,214 | ​ | ​ | 18,439 | ​ | ​ | 15,432
Change in fair value of acquisition contingent earn-outs |  | (4,000) | ​ |  | — | ​ | ​ | (16,400) | ​ | ​ | —
Other operating expense (income), net |  | 2,701 | ​ |  | 1,183 | ​ | ​ | 10,109 | ​ | ​ | (442)
Total operating expenses |  | 116,996 | ​ |  | 105,628 | ​ | ​ | 350,568 | ​ | ​ | 298,128
Income from operations |  | 4,320 | ​ |  | 4,896 | ​ | ​ | 4,942 | ​ | ​ | 10,876
Interest income, net |  | (1,245) | ​ |  | (2,938) | ​ | ​ | (4,012) | ​ | ​ | (2,471)
Income before income taxes |  | 5,565 | ​ |  | 7,834 | ​ | ​ | 8,954 | ​ |  | 13,347
Income tax expense (benefit) |  | 1,520 | ​ |  | 613 | ​ | ​ | (5,260) | ​ | ​ | (1,722)
Net income |  | 4,045 | ​ |  | 7,221 | ​ | ​ | 14,214 | ​ |  | 15,069
Other comprehensive (income) loss: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Foreign currency translation adjustments, net of tax |  | (286) | ​ |  | (8,955) | ​ | ​ | (45,125) | ​ | ​ | (1,609)
Unrealized loss (gain) on investments, net of tax | ​ | — | ​ | ​ | (24) | ​ | ​ | 9 | ​ | ​ | (26)
Total other comprehensive income, net of tax | ​ | (286) | ​ | ​ | (8,979) | ​ | ​ | (45,116) | ​ | ​ | (1,635)
Total comprehensive income | $ | 4,331 | ​ | $ | 16,200 | ​ | $ | 59,330 | ​ | $ | 16,704
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income per share of Class A and Class B, basic | $ | 0.03 | ​ | $ | 0.05 | ​ | $ | 0.09 | ​ | $ | 0.10
Net income per share of Class A and Class B, dilutive | $ | 0.02 | ​ | $ | 0.04 | ​ | $ | 0.09 | ​ | $ | 0.09
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

​

The accompanying notes are an integral part of these condensed consolidated financial statements.

​

​

6

Table of Contents

​

​
​
Vertex, Inc. and Subsidiaries
Condensed Consolidated Statements of Changes in Stockholders’ Equity
For the three and nine months ended September 30, 2025 and 2024 (unaudited)
(Amounts in thousands)

​

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Retained | ​ | Accumulated | ​ | ​ | ​
​ | ​ | Outstanding | ​ | Class A | ​ | Outstanding | ​ | Class B | ​ | Additional |  | Earnings |  | Other |  | Total
​ | ​ | Class A | ​ | Common | ​ | Class B | ​ | Common | ​ | Paid In | ​ | (Accumulated | ​ | Comprehensive | ​ | Stockholders'
​ |  | Shares |  | Stock |  | Shares |  | Stock |  | Capital |  | Deficit) |  | Loss |  | Equity
Balance, January 1, 2025 | ​ | 70,670 | ​ | $ | 71 | ​ | 86,481 | ​ | $ | 86 | ​ | $ | 278,389 | ​ | $ | (53,315) | ​ | $ | (45,879) | ​ | $ | 179,352
Exercise of stock options, net | ​ | 374 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 1,165 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,165
Shares issued upon vesting of Restricted Stock Units, net | ​ | 863 | ​ | ​ | 1 | ​ | — | ​ | ​ | — | ​ | ​ | (25,035) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (25,034)
Stock-based compensation expense | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 18,780 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 18,780
Tax impact on capped call transactions | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1
Foreign currency translation adjustments and revaluations, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,105 | ​ | ​ | 15,105
Unrealized loss from available-for-sale investments, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (9) | ​ | ​ | (9)
Net income | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11,130 | ​ | ​ | — | ​ | ​ | 11,130
Balance, March 31, 2025 | ​ | 71,907 | ​ | $ | 72 | ​ | 86,481 | ​ | $ | 86 | ​ | $ | 273,300 | ​ | $ | (42,185) | ​ | $ | (30,783) | ​ | $ | 200,490
Exercise of stock options, net | ​ | 871 | ​ | ​ | 1 | ​ | — | ​ | ​ | — | ​ | ​ | 6,371 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,372
Shares issued upon vesting of Restricted Stock Units, net | ​ | 52 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (921) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (921)
Shares issued upon vesting of Restricted Stock Awards, net | ​ | 34 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Stock-based compensation expense | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 11,545 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11,545
Shares issued under ESPP | ​ | 53 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 1,782 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,782
Class B shares exchanged for Class A shares | ​ | 4,325 | ​ | ​ | 4 | ​ | (4,325) | ​ | ​ | (4) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Tax impact on capped call transactions | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1
Foreign currency translation adjustments and revaluations, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 29,734 | ​ | ​ | 29,734
Net loss | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (961) | ​ | ​ | — | ​ | ​ | (961)
Balance, June 30, 2025 | ​ | 77,242 | ​ | $ | 77 | ​ | 82,156 | ​ | $ | 82 | ​ | $ | 292,078 | ​ | $ | (43,146) | ​ | $ | (1,049) | ​ | $ | 248,042
Exercise of stock options, net | ​ | 7 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 19 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 19
Shares issued upon vesting of Restricted Stock Units, net | ​ | 66 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (1,073) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,073)
Stock-based compensation expense | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 13,152 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 13,152
Tax impact on capped calls | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1
Foreign currency translation adjustments and revaluations, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 286 | ​ | ​ | 286
Net income | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,045 | ​ | ​ | — | ​ | ​ | 4,045
Balance, September 30, 2025 | ​ | 77,315 | ​ | $ | 77 | ​ | 82,156 | ​ | $ | 82 | ​ | $ | 304,177 | ​ | $ | (39,101) | ​ | $ | (763) | ​ | $ | 264,472
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

7

Table of Contents

​
Vertex, Inc. and Subsidiaries
Condensed Consolidated Statements of Changes in Stockholders’ Equity
For the three and nine months ended September 30, 2025 and 2024 (unaudited) (continued)
(Amounts in thousands)

​

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Retained | ​ | Accumulated | ​ | ​ | ​
​ | ​ | Outstanding | ​ | Class A | ​ | Outstanding | ​ | Class B | ​ | Additional |  | Earnings |  | Other |  | Total
​ | ​ | Class A | ​ | Common | ​ | Class B | ​ | Common | ​ | Paid In | ​ | (Accumulated | ​ | Comprehensive | ​ | Stockholders'
​ | ​ | Shares |  | Stock |  | Shares |  | Stock |  | Capital |  | Deficit) |  | Loss |  | Equity
Balance, January 1, 2024 | ​ | 60,989 | ​ | $ | 61 | ​ | 92,661 | ​ | $ | 93 | ​ | $ | 275,155 | ​ | $ | (586) | ​ | $ | (21,742) | ​ | $ | 252,981
Exercise of stock options, net | ​ | 653 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (5,454) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (5,454)
Shares issued upon vesting of Restricted Stock Units, net | ​ | 674 | ​ | ​ | 1 | ​ | — | ​ | ​ | — | ​ | ​ | (10,899) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (10,898)
Stock-based compensation expense | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 14,845 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 14,845
Foreign currency translation adjustments and revaluations, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4,011) | ​ | ​ | (4,011)
Unrealized loss from available-for-sale investments, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (17) | ​ | ​ | (17)
Net income | ​ | — | ​ |  | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,684 | ​ | ​ | — | ​ | ​ | 2,684
Balance, March 31, 2024 |  | 62,316 | ​ | $ | 62 | ​ | 92,661 | ​ | $ | 93 | ​ | $ | 273,647 | ​ | $ | 2,098 | ​ | $ | (25,770) | ​ | $ | 250,130
Exercise of stock options, net | ​ | 194 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 1,734 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,734
Shares issued upon vesting of Restricted Stock Units, net | ​ | 32 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (432) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (432)
Shares issued upon vesting of Restricted Stock Awards, net | ​ | 62 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Stock-based compensation expense | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 9,924 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,924
Shares issued in connection with ESPP | ​ | 61 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 1,443 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,443
Class B shares exchanged for Class A shares | ​ | 2,500 | ​ | ​ | 3 | ​ | (2,500) | ​ | ​ | (3) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Purchase of capped calls, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (31,517) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (31,517)
Foreign currency translation adjustments and revaluations, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3,335) | ​ | ​ | (3,335)
Unrealized gain from available-for-sale investments, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 19 | ​ | ​ | 19
Net income | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,164 | ​ | ​ | — | ​ | ​ | 5,164
Balance, June 30, 2024 |  | 65,165 | ​ | $ | 65 | ​ | 90,161 | ​ | $ | 90 | ​ | $ | 254,799 | ​ | $ | 7,262 | ​ | $ | (29,086) | ​ | $ | 233,130
Exercise of stock options, net | ​ | 461 | ​ | ​ | 1 | ​ | — | ​ | ​ | — | ​ | ​ | 1,386 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,387
Shares issued upon vesting of Restricted Stock Units, net | ​ | 74 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (1,348) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,348)
Shares issued upon vesting of Restricted Stock Awards, net | ​ | 22 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (290) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (290)
Stock-based compensation expense | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 9,946 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,946
Tax impact on capped calls | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1
Foreign currency translation adjustments and revaluations, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 8,955 | ​ | ​ | 8,955
Unrealized gain from available-for-sale investments, net of tax | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 24 | ​ | ​ | 24
Net income | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,221 | ​ | ​ | — | ​ | ​ | 7,221
Balance, September 30, 2024 |  | 65,722 | ​ | $ | 66 | ​ | 90,161 | ​ | $ | 90 | ​ | $ | 264,494 | ​ | $ | 14,483 | ​ | $ | (20,107) | ​ | $ | 259,026

​

The accompanying notes are an integral part of these condensed consolidated financial statements.

​

8

Table of Contents

Vertex, Inc. and Subsidiaries

Condensed Consolidated Statements of Cash Flows

For the nine months ended September 30, 2025 and 2024 (unaudited)

(Amounts in thousands)

​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine months ended September 30,
​ | 2025 |  | ​ | 2024 | ​
​ | (unaudited)
Cash flows from operating activities: | ​ |  |  | ​ | ​ |
Net income | $ | 14,214 | ​ | $ | 15,069 | ​
Adjustments to reconcile net income to net cash provided by operating activities: |  | ​ | ​ |  | ​ | ​
Depreciation and amortization |  | 70,797 | ​ |  | 61,448 | ​
Amortization of cloud computing implementation costs | ​ | 2,895 | ​ | ​ | 2,994 | ​
Provision for subscription cancellations and non-renewals |  | (498) | ​ |  | (470) | ​
Amortization of deferred financing costs |  | 2,041 | ​ |  | 1,345 | ​
Change in fair value of contingent consideration liabilities | ​ | (16,200) | ​ | ​ | (2,275) | ​
Change in settlement value of deferred purchase commitment liability | ​ | — | ​ | ​ | 423 | ​
Write-off of deferred financing costs | ​ | — | ​ | ​ | 276 | ​
Stock-based compensation expense |  | 46,249 | ​ |  | 36,459 | ​
Deferred income taxes | ​ | (3,029) | ​ | ​ | (8,615) | ​
Non-cash operating lease costs | ​ | 2,440 | ​ | ​ | 2,038 | ​
Other |  | (60) | ​ |  | (151) | ​
Changes in operating assets and liabilities: |  | ​ | ​ |  | ​ | ​
Accounts receivable |  | 35,819 | ​ |  | 15,593 | ​
Prepaid expenses and other current assets |  | (14,489) | ​ |  | (10,245) | ​
Deferred commissions |  | (1,332) | ​ |  | (1,302) | ​
Accounts payable |  | (963) | ​ |  | 4,535 | ​
Accrued expenses |  | 4,362 | ​ |  | (851) | ​
Accrued and deferred compensation |  | (10,910) | ​ |  | 3,032 | ​
Deferred revenue |  | (6,784) | ​ |  | 9,411 | ​
Operating lease liabilities | ​ | (3,191) | ​ | ​ | (2,856) | ​
Payments for purchase commitment and contingent consideration liabilities in excess of initial fair value | ​ | (200) | ​ | ​ | (4,367) | ​
Other |  | 2,114 | ​ |  | 2,197 | ​
Net cash provided by operating activities |  | 123,275 | ​ |  | 123,688 | ​
Cash flows from investing activities: |  |  | ​ |  |  | ​
Acquisition of businesses and assets, net of cash acquired |  | — | ​ |  | (71,755) | ​
Long-term investment | ​ | (15,000) | ​ | ​ | — | ​
Property and equipment additions |  | (69,342) | ​ |  | (47,520) | ​
Capitalized software additions |  | (16,444) | ​ |  | (16,357) | ​
Purchase of investment securities, available-for-sale | ​ | (2,398) | ​ | ​ | (12,246) | ​
Proceeds from sales and maturities of investment securities, available-for-sale | ​ | 11,607 | ​ | ​ | 14,610 | ​
Net cash used in investing activities |  | (91,577) | ​ |  | (133,268) | ​
Cash flows from financing activities: |  |  | ​ |  |  | ​
Net increase (decrease) in customer funds obligations |  | (4,502) | ​ |  | 6,032 | ​
Proceeds from convertible senior notes |  | — | ​ |  | 345,000 | ​
Principal payments on long-term debt |  | — | ​ |  | (46,875) | ​
Payments on third-party debt | ​ | — | ​ | ​ | (3,904) | ​
Payment for purchase of capped calls | ​ | — | ​ | ​ | (42,366) | ​
Payments for deferred financing costs |  | — | ​ |  | (11,374) | ​
Proceeds from purchases of stock under ESPP | ​ | 1,782 | ​ | ​ | 1,443 | ​
Payments for taxes related to net share settlement of stock-based awards | ​ | (27,178) | ​ | ​ | (19,990) | ​
Proceeds from exercise of stock options |  | 7,706 | ​ |  | 4,689 | ​
Payments for purchase commitment and contingent consideration liabilities | ​ | — | ​ | ​ | (7,580) | ​
Payments of finance lease liabilities | ​ | (50) | ​ | ​ | (70) | ​
Net cash provided by (used in) financing activities |  | (22,242) | ​ |  | 225,005 | ​
Effect of exchange rate changes on cash, cash equivalents and restricted cash |  | 3,271 | ​ |  | 810 | ​
Net increase in cash, cash equivalents and restricted cash | ​ | 12,727 | ​ | ​ | 216,235 | ​
Cash, cash equivalents and restricted cash, beginning of period |  | 326,066 | ​ |  | 89,151 | ​
Cash, cash equivalents and restricted cash, end of period | $ | 338,793 | ​ | $ | 305,386 | ​
Reconciliation of cash, cash equivalents and restricted cash to the Condensed Consolidated Balance Sheets, end of period: |  |  | ​ |  |  | ​
Cash and cash equivalents | $ | 313,506 | ​ | $ | 278,979 | ​
Restricted cash—funds held for customers |  | 25,287 | ​ |  | 26,407 | ​
Total cash, cash equivalents and restricted cash, end of period | $ | 338,793 | ​ | $ | 305,386 | ​

​

The accompanying notes are an integral part of these condensed consolidated financial statements.

​

​

9

Table of Contents

Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited)
(Amounts in thousands, except per share data) ​

​

| 1. | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Business

Vertex, Inc. (“Vertex”) and its consolidated subsidiaries (collectively, the “Company”) operate as solutions providers of state, local, and value added tax calculation, compliance, and analytics, offering software products that are sold through software license and software as a service (“cloud”) subscriptions. The Company also provides implementation and training services in connection with its software license and cloud subscriptions, transaction tax returns outsourcing, and other tax-related services. The Company sells to customers located throughout the United States of America (“U.S.”) and internationally.

Basis of Consolidation

The condensed consolidated financial statements are prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) and include the accounts of the Company. All intercompany transactions have been eliminated in consolidation.

On August 30, 2024, the Company completed its acquisition of ecosio GmbH (“ecosio”). Upon its acquisition, ecosio became a wholly owned subsidiary of the Company, and its operations have been included in the Company’s condensed consolidated financial statements commencing on the acquisition date.

Prior to June 5, 2024, the Company owned an 80% controlling equity interest in Systax Sistemas Fiscais LTDA (“Systax”), a provider of Brazilian transaction tax content and software. Systax was determined to be a variable interest entity and the accounts were included in the condensed consolidated financial statements. Vertex did not have full decision-making authority over Systax; however, Vertex was the entity that most significantly participated in the variability of the fair value of Systax’s net assets and was considered the entity most closely associated to Systax. As such, Vertex was deemed the primary beneficiary of Systax and consolidated Systax into its condensed consolidated financial statements. On June 5, 2024, Vertex acquired the remaining 20% equity interest in Systax, resulting in Systax becoming a wholly owned subsidiary of the Company, and is consolidated into the condensed consolidated financial statements.

Unaudited Interim Financial Information

The accompanying unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information and include the accounts of the Company. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes for the year ended December 31, 2024 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 (the “2024 Annual Report”) filed with the SEC on February 27, 2025. The condensed consolidated balance sheet as of December 31, 2024 has been derived from audited financial statements included in the 2024 Annual Report. The accompanying interim condensed consolidated balance sheet as of September 30, 2025, the interim condensed consolidated statements of comprehensive income and changes in stockholders’ equity for the three and nine months ended September 30, 2025 and 2024, and the interim condensed consolidated statements of cash flows for the nine months ended September 30, 2025 and 2024 are unaudited. The unaudited interim condensed consolidated financial statements have been prepared on a basis consistent with that used to prepare the annual audited consolidated financial statements and include, in the opinion of management, all adjustments, consisting of normal and recurring items necessary for the fair presentation of the condensed consolidated financial statements. The operating results for the three and nine months ended September 30, 2025 are not necessarily indicative of the results expected for the full year ending December 31, 2025.

10

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

Use of Estimates

The preparation of condensed consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, equity, revenues, and expenses during the reporting period. Significant estimates used in preparing these condensed consolidated financial statements include: (i) the estimated allowance for subscription cancellations; (ii) expected credit losses associated with the allowance for doubtful accounts; (iii) allowance for credit losses on available-for-sale debt securities; (iv) the reserve for self-insurance; (v) assumptions related to achievement of technological feasibility for software developed for sale; (vi) product life cycles; (vii) estimated useful lives and potential impairment of long-lived assets, intangible assets, and capitalized cloud computing arrangement software implementation costs; (viii) potential impairment of goodwill; (ix) determination of the fair value of tangible and intangible assets acquired, liabilities assumed, and consideration transferred in acquisitions; (x) amortization period of deferred commissions; (xi) Black-Scholes-Merton option pricing model (“Black-Scholes model”) input assumptions used to determine the fair value of certain stock-based compensation awards and Employee Stock Purchase Plan (“ESPP”) purchase rights; (xii) measurement of future purchase commitment, fair value of contingent consideration liabilities related to cash and stock earn-out payments, contingent consideration and deferred purchase consideration liabilities associated with acquisitions; (xiii) measurements of long-term investment and warrant rights; and (xiv) the potential outcome of future tax consequences of events that have been recognized in the condensed consolidated financial statements or tax returns. Actual results may differ from these estimates.

​

Supplemental Balance Sheet Disclosures

Supplemental balance sheet disclosures are as follows for the respective periods:

​

​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | As of September 30, | ​ | ​ | As of December 31,
​ |  | 2025 | ​ | 2024
​ |  | (unaudited) | ​ | ​ | ​
Prepaid expenses and other current assets: |  | ​ |  |  | ​ |
Prepaid expenses | ​ | $ | 21,663 | ​ | $ | 15,223
Unamortized cloud computing implementation costs | ​ | ​ | 4,088 | ​ | ​ | 4,088
Prepaid insurance | ​ | ​ | 1,149 | ​ | ​ | 1,488
Prepaid licenses and support | ​ | ​ | 21,632 | ​ | ​ | 15,879
Prepaid expenses and other current assets | ​ | $ | 48,532 | ​ | $ | 36,678
​ | ​ | ​ | ​ | ​ | ​ | ​
Other assets: | ​ |  | ​ | ​ |  | ​
Unamortized cloud computing implementation costs | ​ | $ | 9,096 | ​ | $ | 10,173
Other assets | ​ | ​ | 4,036 | ​ | ​ | 3,900
Total other assets | ​ | $ | 13,132 | ​ | $ | 14,073
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued expenses: | ​ | ​ | ​ | ​ | ​ | ​
Accrued general expenses | ​ | $ | 15,294 | ​ | $ | 14,862
Accrued contract labor and professional fees | ​ | ​ | 18,307 | ​ | ​ | 15,152
Accrued income and other taxes | ​ | ​ | 6,187 | ​ | ​ | 5,155
Accrued expenses | ​ | $ | 39,788 | ​ | $ | 35,169
​ | ​ | ​ | ​ | ​ | ​ | ​

​

Cloud computing software implementation costs incurred in hosting arrangements are capitalized and included as a component of prepaid expenses and other current assets, or other assets, once available for their intended use. These costs are amortized using the straight-line method over their respective contract service periods, including periods covered by an option to extend, ranging from two to five years. Amortization expense for capitalized cloud computing implementation costs for the three and nine months ended September 30, 2025 were $871 and $2,895, respectively, and for the three and

11

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

nine months ended September 30, 2024 were $1,005 and $2,994, respectively, and are included in general and administrative expense in the condensed consolidated statements of comprehensive income.

​

Recently Issued Accounting Pronouncements

Targeted Improvements to the Accounting for Internal-Use Software

​

On September 18, 2025, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2025-06, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. ASU 2025-06 replaces the existing stage-based capitalization model with a principles-based approach. Under the new guidance, software development costs are capitalized only when (i) management has authorized and committed to funding the software project, and (ii) it is probable that the project will be completed and the software will be used to perform its intended function. The standard also consolidates guidance for website development costs from Subtopic 350-50 into Subtopic 350-40 and introduces enhanced disclosure requirements related to capitalized software costs. The standard is effective for annual reporting periods beginning after December 15, 2027, including interim reporting periods within those fiscal years. The standard can be adopted retrospectively, prospectively or on a modified prospective basis, and early adoption is permitted as of the beginning of an annual reporting period, provided that the financial statements for that period have not yet been issued or made available for issuance. The Company is currently evaluating the impact of the standard on its consolidated financial statements and related disclosures and will determine the appropriate transition method prior to adoption.

Income Tax Disclosures

​

On December 14, 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. ASU 2023-09 requires entities to disclose additional information in specified categories in the reconciliation of the effective tax rate to the statutory rate for federal, state, and foreign income taxes. ASU 2023-09 also requires greater detail about individual reconciling items in the rate reconciliation to the extent the impact of those items exceeds a specified threshold and eliminates certain existing disclosures. In addition to new disclosures associated with the rate reconciliation, the standard requires information pertaining to taxes paid (net of refunds received) to be disaggregated for federal, state, and foreign taxes and further disaggregated for specific jurisdictions to the extent the related amounts exceed a quantitative threshold. The standard is effective for annual reporting periods beginning after December 15, 2024. The guidance will be applied on a prospective basis with the option to apply the standard retrospectively, and early adoption is permitted. The Company is continuing to assess the potential impacts of the standard, but does not expect this pronouncement to have a material effect on its condensed consolidated financial statements, other than the required changes to the income tax disclosures.

Disaggregation of Income Statement Expenses

On November 4, 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. Entities will be required to provide disaggregation of certain expense captions into specified categories in disclosures within the footnotes to the financial statements for both interim and annual reporting periods. The standard does not change the expense captions that an entity presents on the face of the income statement. The standard will be effective for annual reporting periods beginning after December 15, 2026, and for interim reporting periods for annual reporting periods beginning after December 15, 2027, with early adoption permitted. Entities are required to adopt the standard prospectively; however, entities are permitted to apply the amendments retrospectively to any or all prior periods presented in the financial statements. The Company is continuing to assess the potential impacts of the standard, but does not expect this pronouncement to have a material effect on its financial statements, other than the required changes to the disclosures.

​

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

2. REVENUE RECOGNITION

Disaggregation of revenue

The table reflects revenue by major source for the following periods:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, |  | Nine months ended September 30,
​ |  | ​ | 2025 |  | 2024 |  | ​ | 2025 |  | 2024
​ |  | (unaudited) |  | (unaudited)
Software subscriptions: | ​ | ​ | ​ | ​ | ​ |  |  | ​ | ​ | ​ | ​ |
Software licenses | ​ | $ | 72,837 | ​ | $ | 75,273 |  | $ | 215,080 | ​ | $ | 215,365
Cloud subscriptions | ​ | ​ | 91,987 | ​ | ​ | 70,981 |  | ​ | 258,349 | ​ | ​ | 199,162
Software subscriptions | ​ | ​ | 164,824 | ​ | ​ | 146,254 |  | ​ | 473,429 | ​ | ​ | 414,527
Services | ​ |  | 27,288 | ​ |  | 24,181 |  |  | 80,304 | ​ |  | 73,793
Total revenues | ​ | $ | 192,112 | ​ | $ | 170,435 | ​ | $ | 553,733 | ​ | $ | 488,320

​

Contract balances

Timing of revenue recognition may differ from the timing of invoicing customers. A receivable is recorded in the condensed consolidated balance sheets when customers are billed related to revenue to be collected and recognized for subscription agreements as there is an unconditional right to invoice and receive payment in the future related to these subscriptions. A receivable and related revenue may also be recorded in advance of billings to the extent services have been performed and the Company has a right under the contract to bill and collect for such performance. Subscription-based customers are generally invoiced annually at the beginning of each annual subscription period. Accounts receivable is presented net of an allowance for potentially uncollectible accounts and estimated cancellations of software license and cloud-based subscriptions (the “allowance”) of $15,069 and $16,838 at September 30, 2025 and December 31, 2024, respectively. The allowance for potentially uncollectible accounts represents future expected credit losses over the life of the receivables based on past experience, current information and forward-looking economic considerations.

The beginning and ending balances of accounts receivable, net of allowance, are as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended September 30, 2025 | ​ | For the year ended December 31, 2024 | ​
​ | ​ | (unaudited) | ​ | ​ | ​ | ​
Balance, beginning of period | ​ | $ | 164,432 | ​ | $ | 141,752 | ​
Balance, end of period | ​ |  | 131,502 | ​ |  | 164,432 | ​
Increase (decrease) | ​ | $ | (32,930) | ​ | $ | 22,680 | ​

​

A contract liability is recorded as deferred revenue on the condensed consolidated balance sheets when customers are billed in advance of performance obligations being satisfied, and revenue is recognized after invoicing ratably over the subscription period. Deferred revenue is included net of a related deferred allowance for subscription cancellations (the

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

“deferred allowance”) of $10,682 and $12,028 at September 30, 2025 and December 31, 2024, respectively. The deferred allowance represents the portion of the allowance for subscription cancellations associated with deferred revenue.

The beginning and ending balances of and changes to the allowance and the deferred allowance are as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30,
​ | ​ | 2025 | ​ | 2024
​ | ​ | Balance |  | ​ | Net Change |  | Balance |  | ​ | Net Change
​ | ​ | (unaudited)
Allowance balance, July 1 | ​ | $ | (16,389) |  | ​ |  | ​ | $ | (17,704) |  | ​ |
Allowance balance, September 30, | ​ |  | (15,069) |  | ​ |  | ​ |  | (14,273) |  | ​ |
Change in allowance | ​ | ​ | ​ |  | $ | (1,320) | ​ | ​ | ​ |  | $ | (3,431)
Deferred allowance balance, July 1, | ​ |  | 11,661 |  | ​ |  | ​ |  | 12,753 |  | ​ |
Deferred allowance balance, September 30, | ​ |  | 10,682 |  | ​ |  | ​ |  | 10,235 |  | ​ |
Change in deferred allowance | ​ |  | ​ |  | ​ | 979 | ​ |  | ​ |  | ​ | 2,518
Net amount charged to revenues | ​ | ​ | ​ |  | $ | (341) | ​ | ​ | ​ |  | $ | (913)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended September 30,
​ | ​ | 2025 | ​ | 2024
​ | ​ | Balance |  | ​ | Net Change |  | Balance |  | ​ | Net Change
​ | ​ | (unaudited)
Allowance balance, January 1, | ​ | $ | (16,838) |  | ​ |  | ​ | $ | (16,272) |  | ​ |
Allowance balance, September 30, | ​ |  | (15,069) |  | ​ |  | ​ |  | (14,273) |  | ​ |
Change in allowance | ​ | ​ | ​ |  | $ | (1,769) | ​ | ​ | ​ |  | $ | (1,999)
Deferred allowance balance, January 1, | ​ |  | 12,028 |  | ​ |  | ​ |  | 11,741 |  | ​ |
Deferred allowance balance, September 30, | ​ |  | 10,682 |  | ​ |  | ​ |  | 10,235 |  | ​ |
Change in deferred allowance | ​ |  | ​ |  | ​ | 1,346 | ​ |  | ​ |  | ​ | 1,506
Net amount charged to revenues | ​ | ​ | ​ |  | $ | (423) | ​ | ​ | ​ |  | $ | (493)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

​

The portion of deferred revenue expected to be recognized in revenue beyond one year is included in deferred revenue, net of current portion in the condensed consolidated balance sheets. The following table provides information about the balances of and changes to deferred revenue for the following periods:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
​ | ​ | 2025 | ​ | 2024 | ​ | 2025 | ​ | 2024
​ | ​ | (unaudited) | ​ | (unaudited)
Changes to deferred revenue: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Beginning balance | ​ | $ | 347,250 | ​ | $ | 299,741 | ​ | $ | 344,166 | ​ | $ | 292,720
Additional amounts deferred | ​ |  | 183,905 | ​ |  | 175,106 | ​ |  | 548,610 | ​ |  | 500,012
Revenues recognized | ​ |  | (192,112) | ​ |  | (170,435) | ​ |  | (553,733) | ​ |  | (488,320)
Ending balance | ​ | $ | 339,043 | ​ | $ | 304,412 | ​ | $ | 339,043 | ​ | $ | 304,412

​

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

Contract costs

Deferred sales commissions earned by the Company’s sales force and certain sales incentive programs and vendor referral agreements are considered incremental and recoverable costs of obtaining a contract with a customer. An asset is recognized for these incremental contract costs and included as deferred commissions in the condensed consolidated balance sheets. These contract costs are amortized on a straight-line basis over a period consistent with the transfer of the associated product and services to the customer, which is generally one to three years. Amortization of these costs are included in selling and marketing expense in the condensed consolidated statements of comprehensive income. The Company periodically reviews these contract assets to determine whether events or changes in circumstances have occurred that could impact the period of benefit of these assets. There were no impairment losses recorded for the periods presented.

​

The changes to contract cost balances as of and for the following periods are:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
​ | ​ | 2025 | ​ | 2024 | ​ | 2025 | ​ | 2024
​ | ​ | (unaudited) | ​ | (unaudited)
Deferred commissions: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Beginning balance | ​ | $ | 27,737 | ​ | $ | 21,862 | ​ | $ | 27,480 | ​ | $ | 21,237
Additions | ​ |  | 7,205 | ​ |  | 5,024 | ​ |  | 18,184 | ​ |  | 13,793
Amortization | ​ |  | (6,130) | ​ |  | (4,346) | ​ |  | (16,852) | ​ |  | (12,490)
Ending balance | ​ | $ | 28,812 | ​ | $ | 22,540 | ​ | $ | 28,812 | ​ | $ | 22,540

​

​

3. INVESTMENTS

In April 2025, the Company entered into a Preferred Stock Purchase Agreement (the “Purchase Agreement”) with Kintsugi AI, Inc. (“Kintsugi”), a San Francisco-based, AI startup focused on automating sales tax compliance for small and mid-size businesses (the “Kintsugi Investment”). The Company completed the Kintsugi Investment with the goal of expanding use of AI in its tax software solutions to deliver new innovations to customers.

Pursuant to the Purchase Agreement, the Company purchased 1,568 preferred shares (the “Preferred Stock”) for aggregate consideration of approximately $15,000 (the “Purchase Price”), representing approximately 10% of the fully diluted shares outstanding of Kintsugi on an “as converted” basis, and received a warrant to purchase 320 shares of Kintsugi’s Class A common stock at a price of $0.01 per share (the “Warrant”). The Warrant will vest subject to Kintsugi failing to achieve a certain annualized recurring monthly revenue threshold as of January 15, 2026.

The Company and Kintsugi also entered into a license and intellectual property sharing arrangement (the “License Agreement”) providing for, among other things, the Company’s use of and collaboration with respect to certain of Kintsugi’s intellectual property. Additionally, the Company has designated one member to Kintsugi’s board of directors.

In accordance with Accounting Standards Codification (“ASC”) 805-50-30-3, the Company allocated the full Purchase Price to the value of the Preferred Stock as the fair value of both the Warrant and the License Agreement were determined to be nil.

The Company classified the Preferred Stock as an equity security under ASC 321, Investments – Equity Securities. As Kintsugi is a privately held company without a readily determinable fair value, the Preferred Stock qualifies for the measurement alternative under ASC 321 and is measured at cost, less impairment, subject to upward and downward adjustments resulting from observable price changes for identical or similar investments of the same issuer. These

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

adjustments require quantitative assessments of the fair value, which may require the use of unobservable inputs, which management considers to be Level 3 measurements under the fair value hierarchy. The Company performs a qualitative assessment each reporting period to identify indicators of impairment. No observable price change or impairment adjustments have been recorded for the three or nine months ended September 30, 2025. The $15,000 carrying value of the Kintsugi Investment is presented in the long-term investment line in the condensed consolidated balance sheets.

​

The fair value of the Warrant was determined by third-party valuation specialists using a Monte Carlo simulation in a risk-neutral framework calibrated to management’s revenue forecasts. The following assumptions were used: expected revenue volatility of 24.5%, equity volatility of 75.0%, a revenue discount rate of 7.2%, and expected term of 0.8 years.

Total transaction costs associated with the Kintsugi Investment are recorded in other operating expense (income), net in the consolidated statements of comprehensive income and amounts are not material.

​

4. FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes the Company’s fair value for its financial assets and liabilities measured at fair value on a recurring basis:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements Using
As of September 30, 2025 (unaudited) | ​ | Fair Value |  | Prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
Money Market Funds | ​ | $ | 269,664 | ​ | $ | 269,664 | ​ | $ | — | ​ | $ | —
ecosio Cash Earn-outs | ​ | ​ | 83,000 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 83,000
ecosio Stock Earn-outs | ​ | ​ | 23,100 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 23,100
Long-Term Investment (See Note 3) | ​ | ​ | 15,000 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,000
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements Using
As of December 31, 2024 | ​ | Fair Value |  | Prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
Money Market Funds | ​ | $ | 276,374 | ​ | $ | 276,374 | ​ | $ | — | ​ | $ | —
Commercial Paper | ​ | ​ | 4,920 | ​ | ​ | — | ​ | ​ | 4,920 | ​ | ​ | —
Corporate Bonds | ​ | ​ | 250 | ​ | ​ | — | ​ | ​ | 250 | ​ | ​ | —
U.S. Treasury Securities | ​ | ​ | 5,983 | ​ | ​ | — | ​ | ​ | 5,983 | ​ | ​ | —
ecosio Cash Earn-outs | ​ | ​ | 74,400 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 74,400
ecosio Stock Earn-outs | ​ | ​ | 48,100 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 48,100

​

The Company has investments in high quality, short-term money market instruments, which are issued and payable in U.S. dollars (“Money Market Funds”) and included in cash and cash equivalents on the condensed consolidated balance sheets. Fair value inputs for these investments are considered Level 1 measurements within the fair value hierarchy since Money Market Fund fair values are known and observable through daily published floating net asset values. Securities classified as available-for-sale are reported at fair value using Level 2 inputs.

As of December 31, 2024, the Company had additional investments in bank and corporate issued commercial paper (“Commercial Paper”), corporate bonds (“Corporate Bonds”), and U.S. treasury securities (“U.S. Treasury Securities”). The Company believes that Level 2 designation was appropriate for these securities under ASC 820-10, Fair Value

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

Measurements and Disclosures, as these securities were fixed income securities, none were exchange-traded, and all were priced by correlation to observed market data. For these securities, the Company obtained fair value measurements from an independent pricing service. The fair value measurements considered observable data that may have included dealer quotes, market spreads, cash flows, U.S. government and agency yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the security’s terms and conditions, among other factors. These securities qualified as debt securities per ASC 320, Investments– Debt Securities, and were classified as available-for-sale as they could be liquidated and used for general corporate purposes. These securities were carried at fair value in the investment securities available-for-sale line in the condensed consolidated balance sheets, with the unrealized holding gains and (losses), net of tax, included in other comprehensive (income) loss until realized. During the first quarter of 2025, the Company fully liquidated these securities, which resulted in a realized gain of $19, which is included in the interest expense (income), net line of the condensed consolidated statements of comprehensive income for the nine months ended September 30, 2025.

​

Tellutax Contingent Consideration

​

In connection with the January 2021 Tellutax LLC (“Tellutax”) acquisition, the sellers were entitled to contingent consideration if sales targets were met during a period of time following the acquisition (the “Tellutax Contingent Consideration”).

The Tellutax Contingent Consideration was based on three potential earn-out payments determined by periodic revenue achievements over a thirty-month period. The final payment of $200 was made during the second quarter of 2025 and is included in other operating expense, net for the three and nine months ended September 30, 2025. Fair value adjustments of $100 and $(2,275) were included in other operating expense (income), net for the three and nine months ended September 30, 2024, respectively. At both September 30, 2025 and December 31, 2024, the Tellutax Contingent Consideration balance was $0.

Systax Purchase Commitment Liability

The Company had a contractual commitment to acquire the remaining equity interest from the original Systax quotaholders incrementally through 2024. Purchase commitment payments for these incremental acquisition amounts were based on a multiple of Systax revenue and earnings before interest, depreciation, amortization, and income taxes (“EBITDA”) performance at the end of 2023 and 2022. Management determined these future purchase commitments to be a forward contract, resulting in the Company being required to estimate and record an estimated future purchase commitment amount (the “Purchase Commitment Liability”) in connection with recording the initial purchase. Adjustments to the settlement date value that arose as a result of remeasurement at future balance sheet dates were reflected as interest expense related to financing costs in the condensed consolidated statements of comprehensive income (loss) in the period the change is identified. A final adjustment for $423 to interest expense was recorded in the second quarter of 2024.

During the second quarter of 2024, the Company paid $9,622 to acquire the remaining 20% equity interest of Systax, which increased the Company’s ownership percentage of Systax to 100%, and settled the outstanding Purchase Commitment Liability.

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

ecosio Earn-outs

In connection with the August 2024 ecosio acquisition, the sellers are entitled to three annual earn-outs in the form of cash, with an aggregate of up to $94,355 (the “Cash Earn-outs”), and stock, with an aggregate value of up to $35,000 (the “Stock Earn-outs,” and together with the Cash Earn-outs, the “Earn-outs”), assuming maximum payouts. The Earn-outs are based on ecosio’s achievement of certain monthly software revenue targets over a three-year period, measured over an aggregate of 12 months and paid within 90 days after the relevant measurement period. At the acquisition date, the fair value of the Cash Earn-outs and Stock Earn-outs were $71,000 and $34,000, respectively. The fair value of the Cash Earn-out and the Stock Earn-out were measured on the acquisition date using a Monte Carlo simulation in a risk-neutral framework, calibrated to management’s revenue forecasts. Additional information on the Cash Earn-outs and the Stock Earn-outs is presented in the following table:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Maximum | ​ | Fair Value | ​ | Fair Value
Cash Earn-outs/ Period (unaudited) | ​ | Payout | ​ | September 30, 2025 | ​ | December 31, 2024
Year 1 - December 1, 2024 - December 1, 2025 | ​ | $ | 19,600 | ​ | $ | 19,100 | ​ | $ | 17,900
Year 2 - December 1, 2025 - December 1, 2026 | ​ | ​ | 30,625 | ​ | ​ | 27,900 | ​ | ​ | 24,400
Year 3 - December 1, 2026 - December 1, 2027 | ​ | ​ | 44,130 | ​ | ​ | 36,000 | ​ | ​ | 32,100
Total Cash Earn-outs | ​ | $ | 94,355 | ​ | $ | 83,000 | ​ | $ | 74,400
​ | ​ | Maximum | ​ | Fair Value | ​ | Fair Value
Stock Earn-outs/ Period (unaudited) | ​ | Payout (1) | ​ | September 30, 2025 | ​ | December 31, 2024
Year 1 - December 1, 2024 - December 1, 2025 | ​ | $ | 12,000 | ​ | $ | 8,000 | ​ | $ | 17,200
Year 2 - December 1, 2025 - December 1, 2026 | ​ | ​ | 12,000 | ​ | ​ | 8,000 | ​ | ​ | 16,300
Year 3 - December 1, 2026 - December 1, 2027 | ​ | ​ | 11,000 | ​ | ​ | 7,100 | ​ | ​ | 14,600
Total Stock Earn-outs | ​ | $ | 35,000 | ​ | $ | 23,100 | ​ | $ | 48,100
(1) Maximum payout based on Vertex's August 6, 2024 opening share price of $37.02, as referenced in the purchase agreement.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

​

Actual payouts are further adjusted depending on ecosio’s software revenue attainment for each of the measurement periods. In the event that actual software revenues exceed 100% of the target, additional payments may be made up to a maximum of 122.5% of the annual target. If actual software revenues are below 85% of the target, no payouts are made for that measurement period. The Stock Earn-outs are paid in shares of the Company’s Class A common stock.

​

The Cash Earn-outs and Stock Earn-outs are recorded at fair value in the condensed consolidated balance sheets as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | As of September 30, 2025 | ​ | As of December 31, 2024
​ | (unaudited) | ​ | ​ | ​ | ​ | ​ | ​
​ | Current (1) | ​ | Non-Current (2) | ​ | Current (1) | ​ | Non-Current (2)
Cash Earn-outs | $ | 19,100 | ​ | $ | 63,900 | ​ | $ | 17,900 | ​ | $ | 56,500
Stock Earn-outs | ​ | 8,000 | ​ | ​ | 15,100 | ​ | ​ | 17,200 | ​ | ​ | 30,900
Total | $ | 27,100 | ​ | $ | 79,000 | ​ | $ | 35,100 | ​ | $ | 87,400
​
(1) Included in purchase commitment and contingent consideration liabilities, current.
(2) Included in purchase commitment and contingent consideration liabilities, net of current portion.

​

These Earn-outs represent recurring fair value measurements with significant unobservable inputs, which management considers to be Level 3 measurements under the fair value hierarchy. The final payments may be adjusted depending on the actual amount, above or below the target. The Earn-outs will be revalued and adjusted quarterly until the end of the Earn-out period, and any fair value adjustments will be recorded in the other operating expense (income), net line of the condensed consolidated statement of income (loss).

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

During the three months ended September 30, 2025, the Company recorded fair value adjustments of $5,100 and $(9,100) to the Cash Earn-outs and Stock Earn-outs, respectively. During the nine months ended September 30, 2025, the Company recorded fair value adjustments of $8,600 and $(25,000) to the Cash Earn-outs and Stock Earn-outs, respectively.

The fair values of the Cash Earn-outs and the Stock Earn-outs and unobservable inputs used for the Monte Carlo Simulation valuation are shown in the table below.

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025 (unaudited)
Liabilities |  | Fair Value |  | ​ | Valuation Technique | ​ | ​ | Unobservable Inputs
ecosio Contingent Consideration - Cash Earn-outs | ​ | $ | 83,000 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | ​ | 22.5 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | ​ | 7.1 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | ​ | 2.4 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
ecosio Contingent Consideration - Stock Earn-outs | ​ | $ | 23,100 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | ​ | 22.5 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | ​ | 7.1 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | ​ | 2.4 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
Liabilities |  | Fair Value |  | ​ | Valuation Technique | ​ | ​ | Unobservable Inputs
ecosio Contingent Consideration - Cash Earn-outs | ​ | $ | 74,400 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | ​ | 21.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | ​ | 7.7 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | ​ | 3.2 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
ecosio Contingent Consideration - Stock Earn-outs | ​ | $ | 48,100 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | ​ | 21.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | ​ | 7.7 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | ​ | 3.2 | ​

​

Changes in the fair value of the Company’s Level 3 liabilities during the nine months ended September 30, 2025 were as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ecosio | ​ | ​ | ​
​ | ​ | Contingent Consideration | ​ | ​ | Kintsugi
​ | ​ | Cash Earn-outs | ​ | Stock Earn-outs | ​ | ​ | Long-term Investment
​ | ​ | (unaudited) | ​ | ​ | (unaudited)
Balance, January 1, 2025 | ​ | $ | 74,400 | ​ | $ | 48,100 | ​ | $ | —
Initial measurement | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,000
Fair value adjustments | ​ | ​ | 8,600 | ​ | ​ | (25,000) | ​ | ​ | —
Balance, September 30, 2025 | ​ | $ | 83,000 | ​ | $ | 23,100 | ​ | $ | 15,000

​

Assets and Liabilities for Which Fair Value is Only Disclosed

​

The carrying amounts of cash and cash equivalents and the carrying amount of funds held for customers were the same as their respective fair values and are considered Level 1 measurements.

The carrying amount of the Company’s bank debt approximates fair value as the variable rates on the debt approximate those commercially available in the market and is considered a Level 3 measurement.

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

Non-recurring Fair Value Measurements

The ecosio acquisition on August 30, 2024, the Tellutax acquisition on January 25, 2021, and the Systax acquisition on January 10, 2020 were accounted for as business combinations, and the total purchase price for each acquisition was allocated to the net assets acquired and liabilities assumed based on their estimated fair values.

Derivative Instruments

​

The Company may periodically enter into derivative contracts to reduce its exposure to foreign currency exchange rates. Historically, the Company has not designated derivative contracts as hedges. Such derivative contracts are typically designed to manage specific risks according to the Company’s strategies, which may change from time to time.

Convertible Senior Notes

​

As of September 30, 2025 and December 31, 2024, the fair value of the Notes (as defined in Note 8, “Debt”) was $350,003 and $539,494, respectively. The fair value was determined based on the quoted price of the Notes in an over-the-counter market on the last trading day of the reporting period and has been classified as Level 2 in the fair value hierarchy. For further information on the Notes, refer to Note 8, “Debt”.

​

5. PROPERTY AND EQUIPMENT

The major components of property and equipment are as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, | ​ | As of December 31,
​ | ​ | 2025 | ​ | 2024
​ |  | (unaudited) |  | ​
Leasehold improvements | ​ | $ | 20,513 | ​ | $ | 20,096
Equipment | ​ |  | 18,377 | ​ |  | 14,386
Computer software purchased | ​ |  | 1,383 | ​ |  | 1,344
Internal-use software developed: | ​ |  | ​ | ​ |  | ​
Cloud-based customer solutions | ​ |  | 313,120 | ​ |  | 237,232
Internal systems and tools | ​ |  | 85,743 | ​ |  | 72,406
Furniture and fixtures | ​ |  | 7,324 | ​ |  | 7,292
In-process internal-use software | ​ |  | 18,243 | ​ |  | 28,916
Property and equipment | ​ |  | 464,703 | ​ |  | 381,672
Less accumulated depreciation and amortization | ​ |  | (262,048) | ​ |  | (204,113)
Property and equipment, net | ​ | $ | 202,655 | ​ | $ | 177,559
​ | ​ | ​ | ​ | ​ | ​ | ​

​

Depreciation expense for property and equipment, excluding all internal-use software developed and finance leases, was $1,089 and $1,004 for the three months ended September 30, 2025 and 2024, respectively, and $3,213 and $3,369 for the nine months ended September 30, 2025 and 2024, respectively, and is included in depreciation and amortization in the condensed consolidated statements of comprehensive income.

Finance lease amortization was $18 and $19 for the three months ended September 30, 2025 and 2024, respectively, and $56 and $61 for the nine months ended September 30, 2025 and 2024, respectively, and is included in depreciation and amortization in the condensed consolidated statements of comprehensive income.

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

Assets under finance leases of $265 and $172, net of accumulated amortization of $153 and $97, respectively, at September 30, 2025 and December 31, 2024, respectively, are included in property and equipment, net in the condensed consolidated balance sheets.

The major components of internal-use software developed are as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, | ​ | As of December 31,
​ | ​ | 2025 | ​ | 2024
​ |  | (unaudited) |  | ​ | ​
Internal-use software developed | ​ | $ | 398,863 | ​ | $ | 309,638
Less accumulated depreciation | ​ |  | (225,652) | ​ |  | (171,181)
Internal-use software developed, net of accumulated depreciation | ​ |  | 173,211 | ​ |  | 138,457
In-process internal-use software | ​ |  | 18,243 | ​ |  | 28,916
Internal-use software developed, net | ​ | $ | 191,454 | ​ | $ | 167,373

​

​

Amounts included in property and equipment additions related to capitalized internal-use software on the condensed consolidated statements of cash flows are as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended September 30,
​ | ​ | 2025 | ​ | 2024
​ | ​ | (unaudited)
Cloud-based customer solutions |  | $ | 49,177 | ​ | $ | 32,078
Internal systems and tools | ​ |  | 16,001 | ​ |  | 14,683
Total | ​ | $ | 65,178 | ​ | $ | 46,761

​

In-process internal-use software developed is not depreciated until it is available for its intended use. Depreciation expense for internal-use software developed for cloud-based customer solutions for the three months ended September 30, 2025 and 2024 was $12,522 and $7,909, respectively, and $33,791 and $25,685 for the nine months ended September 30, 2025 and 2024, respectively, and is included in cost of revenues, software subscriptions in the condensed consolidated statements of comprehensive income.

Depreciation expense for internal-use software developed for internal systems and tools for the three months ended September 30, 2025 and 2024 was $5,264 and $4,191, respectively, and $15,170 and $12,002 for the nine months ended September 30, 2025 and 2024, respectively, and is included in depreciation and amortization in the condensed consolidated statements of comprehensive income.

​

6. CAPITALIZED SOFTWARE

Capitalized software includes acquired software and direct labor and related expenses for software developed for sale for new products and enhancements to existing products.

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Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

The major components of capitalized software are as follows:

​

​ | ​ | ​ | ​ | ​ | ​
​ | As of September 30, | ​ | As of December 31,
​ | 2025 | ​ | 2024
​ | (unaudited) | ​ | ​ | ​
Capitalized software | $ | 156,755 | ​ | $ | 140,562
Less accumulated amortization |  | (121,600) | ​ |  | (105,175)
Capitalized software, net of accumulated depreciation |  | 35,155 | ​ |  | 35,387
In-process capitalized software |  | 762 | ​ |  | 963
Capitalized software, net | $ | 35,917 | ​ | $ | 36,350

​

Software development costs capitalized for the three months ended September 30, 2025 and 2024 were $5,879 and $5,260, respectively, and $16,444 and $16,357 for the nine months ended September 30, 2025 and 2024, respectively.

Capitalized software amortization expense, including amortization of acquired technology, was $5,621 and $6,236 for the three months ended September 30, 2025 and 2024, respectively, and $16,877 and $18,264 for the nine months ended September 30, 2025 and 2024, respectively, and is included in cost of revenues, software subscriptions in the condensed consolidated statements of comprehensive income.

​

7. GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill and other intangible assets are as follows for the periods presented:

​

​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, | ​ | As of December 31,
​ | ​ | 2025 | ​ | 2024
​ | ​ | ​ | (unaudited) | ​ | ​ | ​
Goodwill | ​ | $ | 392,893 | ​ | $ | 357,823
Other intangible assets, net | ​ | ​ | 4,104 | ​ |  | 5,198
Total | ​ | $ | 396,997 | ​ | $ | 363,021

​

​

The Company has recognized various amortizable other intangible assets in connection with acquisitions related to customer relationships, technology, and tradenames. The following tables provide additional information for other intangible assets, which are individually not material to the condensed consolidated financial statements, for the periods presented:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | As of September 30, | ​ | As of December 31,
​ | ​ | ​ | ​ | ​ | 2025 | ​ | 2024
​ | ​ | ​ | ​ | ​ | ​ | (unaudited) | ​ | ​ | ​
Weighted average amortization period (years) | ​ | ​ | ​ | ​ | ​ | 1.9 | ​ | ​ | 2.6
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross value | ​ | ​ | ​ | ​ | $ | 17,107 | ​ | $ | 15,818
Accumulated amortization | ​ | ​ | ​ | ​ | ​ | (13,003) | ​ | ​ | (10,620)
Carrying value | ​ | ​ | ​ | ​ | $ | 4,104 | ​ | $ | 5,198

​

​

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

The following table presents amortization of other intangible assets:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the three months ended September 30, | ​ | ​ | ​ | Cost of Revenues, Software Subscriptions | ​ | Selling and Marketing Expense | ​ | ​ | Total Expense
2025 | ​ | ​ | ​ |  | $ | — |  | $ | 588 | ​ | $ | 588
2024 | ​ | ​ | ​ | ​ | ​ | 55 | ​ | ​ | 706 | ​ | ​ | 761
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the nine months ended September 30, | ​ | ​ | ​ | Cost of Revenues, Software Subscriptions | ​ | Selling and Marketing Expense | ​ | ​ | Total Expense
2025 | ​ | ​ | ​ |  | $ | — |  | $ | 1,690 | ​ | $ | 1,690
2024 | ​ | ​ | ​ |  | ​ | 174 |  | ​ | 1,893 | ​ | ​ | 2,067

​

​

8.DEBT

Credit Agreement

The Company has a credit agreement (“Credit Agreement”) with a banking syndicate, which initially provided (i) a term loan in the aggregate amount of $50,000 (the “Term Loan”); and (ii) a $200,000 revolving facility (the “Line of Credit”). On May 10, 2024, the Company repaid the outstanding Term Loan balance in full.

On November 4, 2024, the Company entered into a Fifth Amendment to the Credit Agreement (the “Fifth Amendment”), which provided for, among other modifications, an increase in the Line of Credit commitment from $200,000 to $300,000 and an extension of the maturity date to November 4, 2029.

The Company had no outstanding borrowings under the Credit Agreement at September 30, 2025 or December 31, 2024.

Indenture and Notes

​

On April 26, 2024, the Company issued $345,000 aggregate principal amount of 0.750% Convertible Senior Notes due 2029 (the “Notes”) to qualified institutional buyers in accordance with Rule 144A under the Securities Act of 1933, as amended. The Notes bear interest at a rate of 0.750% per annum on the principal amount thereof, payable semi-annually in arrears on May 1 and November 1 of each year, beginning on November 1, 2024. The Notes will mature on May 1, 2029, unless earlier repurchased, redeemed or converted in accordance with their terms.

​

There have been no changes to the initial conversion price of the Notes since issuance. The Notes are convertible into the Company’s Class A common stock at the option of the holders. As of September 30, 2025, none of the Notes were converted.

​

Capped Call Transactions

​

In connection with the pricing of the Notes on April 23, 2024, the Company entered into privately negotiated capped call transactions (the “Base Capped Call Transactions”) with certain financial institutions (together, the “Option Counterparties”). In connection with the exercise of the option to purchase the additional Notes in full, the Company

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

entered into additional capped call transactions with the Option Counterparties (together with the Base Capped Call Transactions, the “Capped Call Transactions”).

​

The Company’s indebtedness at September 30, 2025 and December 31, 2024 was as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | As of September 30, 2025 (unaudited) | ​ | As of December 31, 2024
​ | ​ | Principal Amount | ​ | ​ | Discounts and Deferred Financing Costs | ​ | ​ | Net Carrying Amount | ​ |  | Principal Amount | ​ | ​ | Discounts and Deferred Financing Costs | ​ | ​ | Net Carrying Amount
Convertible senior notes, non-current | ​ | 345,000 | ​ | ​ | (8,087) | ​ | ​ | 336,913 | ​ | ​ | 345,000 | ​ | ​ | (9,780) | ​ | ​ | 335,220
Total debt | $ | 345,000 | ​ | $ | (8,087) | ​ | $ | 336,913 | ​ | $ | 345,000 | ​ | $ | (9,780) | ​ | $ | 335,220

​

​

​

​

​

​

​

​

​

​

​

​

​

The Company’s interest expense related to the Notes is as follows:

​

​

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | For the three months ended September 30, | ​ | ​ | ​ | For the nine months ended September 30,
​ | ​ | ​ | ​ | 2025 | ​ | ​ | 2024 | ​ | ​ | ​ | 2025 | ​ | ​ | 2024
​ | ​ | ​ | ​ | (unaudited) | ​ | ​ | (unaudited)
Contractual interest expense | ​ | ​ | $ | 646 | ​ | $ | 677 | ​ | ​ | $ | 1,940 | ​ | $ | 1,108
Amortization of issuance costs | ​ | ​ | ​ | 565 | ​ | ​ | 564 | ​ | ​ | ​ | 1,693 | ​ | ​ | 940
Total interest expense, convertible senior notes | ​ | ​ | $ | 1,211 | ​ | $ | 1,241 | ​ | ​ | $ | 3,633 | ​ | $ | 2,048

​

​

​

​

​

​

​

​

​

​

​

9.STOCKHOLDERS’ EQUITY

Common Stock

During the three months ended September 30, 2025, the Company issued (i) 7 shares of Class A common stock related to the exercise of options, and (ii) 66 shares of Class A common stock in connection with the vesting of Restricted Stock Units (“RSUs”), net of 34 shares returned to the Company in lieu of payment of taxes due on the vesting of these RSUs. During the nine months ended September 30, 2025, the Company issued (i) 1,252 shares of Class A common stock related to the exercise of options, net of 18 shares returned to the Company in lieu of payment of the exercise price and taxes due on these exercises, (ii) 981 shares of Class A common stock in connection with the vesting of RSUs, net of 604 shares returned to the Company in lieu of payment of taxes due on the vesting of these RSUs, (iii) 34 shares of Class A common stock in connection with the vesting of Restricted Stock Awards (“RSAs”), (iv) 53 shares of Class A common stock in connection with the ESPP, and (v) 4,325 shares of Class A common stock related to a stockholder’s election to convert an equivalent number of shares of Class B common stock.

During the three months ended September 30, 2024, the Company issued (i) 461 shares of Class A common stock related to the exercise of options, net of 2 shares returned to the Company in lieu of payment of the exercise price and taxes due on these exercises, (ii) 74 shares of Class A common stock in connection with the vesting of RSUs, net of 36 shares returned to the Company in lieu of payment of taxes due on the vesting of these RSUs, and (iii) 22 shares of Class A common stock in connection with the vesting of RSAs, net of 7 shares returned to the Company in lieu of payment of taxes due on the vesting of these RSAs. During the nine months ended September 30, 2024, the Company issued (i) 1,308 shares of Class A common stock related to the exercise of options, net of 268 shares returned to the Company in lieu of payment of the exercise price and taxes due on these exercises, (ii) 780 shares of Class A common stock in connection with the vesting of RSUs, net of 467 shares returned to the Company in lieu of payment of taxes due on the vesting of these RSUs, (iii) 84 shares of Class A common stock in connection with the vesting of RSAs, net of 7 shares returned to the Company in lieu of payment of taxes due on the vesting of these RSAs, (iv) 61 shares of Class A common

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Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

stock in connection with the ESPP, and (v) 2,500 shares of Class A common stock related to a stockholder’s election to convert an equivalent number of shares of Class B common stock.

10. EARNINGS PER SHARE

The Company has two classes of common stock outstanding and thus calculates earnings per share (“EPS”) following the two-class method. This method allocates earnings for the respective periods between the two classes of common stock in proportion to the weighted average shares outstanding for each class of common stock as a percentage of total weighted average shares of both classes of common stock outstanding. Neither the Class A nor Class B common stock has any liquidity or dividend preferences and are both considered to be participating securities.

​

Basic and diluted net income (loss) per share attributable to common stockholders is calculated using the treasury stock and if-converted methods. The basic net income (loss) per share attributable to Class A common stockholders includes RSAs, RSUs, Performance Stock Units (“PSUs”), and ESPP shares once vesting or purchase contingencies are resolved, and the related shares are deemed to be outstanding. The diluted net income (loss) per share attributable to Class A common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, all options to purchase shares of Class A common stock and nonvested RSAs and RSUs are considered common stock equivalents. PSUs are included in the computation of diluted net income (loss) per share only to the extent that the underlying performance conditions are satisfied prior to the end of the reporting period or would be satisfied if the end of the reporting period were the end of the related performance period, and if the effect would be dilutive. The portion of ESPP shares for which the Company has received payments but for which the related shares are not yet issuable are also considered potential common stock equivalents. Additionally, the dilutive effect of shares issuable upon conversion of the Notes is included in the calculation of diluted EPS by application of the if-converted method. In connection with the issuance of the Notes, the Company entered into the Capped Call Transactions, which are not included for purposes of calculating the number of diluted weighted-average shares outstanding, as their effect would be anti-dilutive. The Company has excluded the effect of its Class A common stock to be issued in connection with the Stock Earn-outs as the underlying performance conditions were not satisfied prior to the end of the reporting period, nor would they be satisfied if the end of the reporting period were the end of the related performance period. In periods of net loss available to common stockholders, diluted calculations are equal to basic calculations because the inclusion of potential common stock equivalents would be anti-dilutive.

​

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

The tables below illustrate the calculation of basic and diluted net income per common share for the Class A common stock and Class B common stock for the periods reflected below.

​

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
​ | ​ | 2025 | ​ | ​ | 2024 | ​ | ​ | 2025 | ​ | ​ | 2024
​ | ​ | Class A | ​ | ​ | Class B | ​ | ​ | Class A | ​ | ​ | Class B | ​ | ​ | Class A | ​ | ​ | Class B | ​ | ​ | Class A | ​ | ​ | Class B
​ | (unaudited) | ​ | (unaudited)
Basic net income per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Numerator | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allocation of net income (1) | $ | 1,961 | ​ | $ | 2,084 | ​ | $ | 3,038 | ​ | $ | 4,183 | ​ | $ | 6,636 | ​ | $ | 7,578 | ​ | $ | 6,197 | ​ | $ | 8,872
Denominator | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total shares used in per share computation | ​ | 77,290 | ​ |  | 82,156 | ​ | ​ | 65,468 | ​ |  | 90,161 | ​ |  | 74,102 | ​ | ​ | 84,610 | ​ |  | 63,742 | ​ |  | 91,251
Basic net income per share: | $ | 0.03 | ​ | $ | 0.03 | ​ | $ | 0.05 | ​ | $ | 0.05 | ​ | $ | 0.09 | ​ | $ | 0.09 | ​ | $ | 0.10 | ​ | $ | 0.10
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Numerator | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allocation of net income (1) | $ | 1,996 | ​ | $ | 2,049 | ​ | $ | 3,206 | ​ | $ | 4,015 | ​ | $ | 6,813 | ​ | $ | 7,401 | ​ | $ | 6,549 | ​ | $ | 8,520
Total net income used in per diluted computation | $ | 1,996 | ​ | $ | 2,049 | ​ | $ | 3,206 | ​ | $ | 4,015 | ​ | $ | 6,813 | ​ | $ | 7,401 | ​ | $ | 6,549 | ​ | $ | 8,520
Denominator | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Number shares used in basic per share computation | ​ | 77,290 | ​ |  | 82,156 | ​ | ​ | 65,468 | ​ |  | 90,161 | ​ |  | 74,102 | ​ |  | 84,610 | ​ | ​ | 63,742 | ​ |  | 91,251
Dilutive effect of common stock equivalents | ​ | 2,725 | ​ |  | — | ​ | ​ | 6,509 | ​ |  | — | ​ |  | 3,782 | ​ |  | — | ​ | ​ | 6,394 | ​ |  | —
Total shares used in per share computation (2) | ​ | 80,015 | ​ | ​ | 82,156 | ​ | ​ | 71,977 | ​ | ​ | 90,161 | ​ | ​ | 77,884 | ​ | ​ | 84,610 | ​ | ​ | 70,136 | ​ | ​ | 91,251
Dilutive net income per share: | $ | 0.02 | ​ | $ | 0.02 | ​ | $ | 0.04 | ​ | $ | 0.04 | ​ | $ | 0.09 | ​ | $ | 0.09 | ​ | $ | 0.09 | ​ | $ | 0.09
(1) Allocation of net income is based on the percentage of shares outstanding.
(2) The following resulted in anti-dilutive impact to EPS and therefore were excluded from the calculation: (i) for both the three and nine months ended September 30, 2025, a total of 9,498 shares assumed to be converted from the Notes, (ii) for the three months ended September 30, 2025, a total of 51 out-of-the-money options, (iii) for the nine months ended September 30, 2025 and 2024, a total of 21 and 135 out-of-the-money options, respectively, and (iv) for the three and nine months ended September 30, 2025, a total of 212 and 201 PSUs, respectively.

​

​

​

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​

​

11. STOCK-BASED AWARD PLANS

The 2020 Incentive Award Plan (the “2020 Plan”) provides the ability to grant cash and equity-based incentive awards to eligible employees, directors and service providers in order to attract, retain and motivate those that make important contributions to the Company. The Company issued stock options, RSAs, RSUs, and PSUs under the 2020 Plan. As of September 30, 2025, 20,108 shares of Class A common stock were available for issuance under the 2020 Plan.

​

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Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

Options

The following table summarizes activity for options outstanding under the 2020 Plan for the nine months ended September 30, 2025:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​
​ | ​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
2020 Plan Option Activity | ​ | Units | ​ | ​ | Price | ​ | Life (Years) | ​ | Value
​ | ​ | (unaudited)
Outstanding at January 1, 2025 | ​ | 2,970 | ​ | $ | 6.93 | ​ | 4.4 | ​ | $ | 137,857
Exercised | ​ | (1,270) | ​ | ​ | 6.41 | ​ | ​ | ​ | ​ | ​
2020 Plan options outstanding at September 30, 2025 | ​ | 1,700 | ​ | $ | 7.32 | ​ | 4.6 | ​ | $ | 30,314
2020 Plan options exercisable at September 30, 2025 |  | 1,646 | ​ | $ | 6.95 |  | 4.5 | ​ | $ | 29,977

​

​

The details of options outstanding, vested, and exercisable under the 2020 Plan as of September 30, 2025 are as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options Outstanding | ​ | Options Vested and Exercisable
​ |  | ​ |  | Weighted |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
Exercise Prices | ​ | Units | ​ | Life (Years) | ​ | Units | ​ | Life (Years)
​ | ​ | (unaudited)
$0.15 to $0.71 |  | 310 | ​ | * | ​ | 310 | ​ | *
$2.50 |  | 8 | ​ | 0.3 | ​ | 8 | ​ | 0.3
$3.17 |  | 58 | ​ | 2.4 | ​ | 58 | ​ | 2.4
$3.73 | ​ | 481 | ​ | 4.1 | ​ | 481 | ​ | 4.1
$4.70 | ​ | 466 | ​ | 4.4 | ​ | 466 | ​ | 4.4
$18.47 | ​ | 190 | ​ | 6.2 | ​ | 136 | ​ | 6.2
$18.96 | ​ | 60 | ​ | 5.9 | ​ | 60 | ​ | 5.9
$19.00 |  | 43 | ​ | 6.0 | ​ | 43 | ​ | 6.0
$32.16 |  | 84 | ​ | 5.4 | ​ | 84 | ​ | 5.4
​ | ​ | 1,700 | ​ | ​ |  | 1,646 | ​ | ​
*These options have indefinite contractual lives. |  | ​ | ​ | ​ | ​ | ​ | ​ | ​

​

The Board of Directors (the “Board”) intends all options granted to be exercisable at a price per share not less than the per share fair market value of the Company’s Class A common stock underlying the options on the date of grant. Compensation expense for option awards are measured based on the grant date fair value of the awards and recognized in the condensed consolidated statements of comprehensive income (loss) over the period during which the participant is required to perform the requisite services. The vesting period is generally one to four years. The grant date fair value of options is estimated using the Black-Scholes model.

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

There were no options issued under the 2020 Plan during the three months ended September 30, 2025 or 2024.

​

At September 30, 2025, $63 of unrecognized compensation expense associated with options is expected to be recognized over a weighted average period of approximately 0.3 years.

​

Restricted Stock Units

The following table summarizes RSU activity for the nine months ended September 30, 2025:

​

​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date Fair
​ | ​ | Units | ​ | Value Per Share
Outstanding at January 1, 2025 | ​ | 4,534 | ​ | $ | 19.96
Granted | ​ | 1,229 | ​ | ​ | 44.48
Vested | ​ | (1,585) | ​ | ​ | 18.99
Forfeited | ​ | (110) | ​ | ​ | 29.00
Outstanding at September 30, 2025 | ​ | 4,068 | ​ | $ | 27.50
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​

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Stock-based compensation cost for RSUs is measured based on the fair value of the Company’s underlying common stock on the date of grant and is recognized on a straight-line basis in the condensed consolidated statements of comprehensive income (loss) over the period during which the participant is required to perform services in exchange for the award, which is generally one to four years. Vested RSUs are settled by issuing Class A common stock or the equivalent value in cash at the Board’s discretion. At September 30, 2025, $68,680 of unrecognized compensation expense for RSUs is expected to be recognized over a weighted average period of approximately 2.5 years.

Restricted Stock Awards

The following table summarizes RSA activity for the nine months ended September 30, 2025:

​

​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date Fair
​ | ​ | Units | ​ | Value Per Share
Outstanding at January 1, 2025 | ​ | 34 | ​ | $ | 35.06
Granted | ​ | 37 | ​ | ​ | 37.55
Vested | ​ | (34) | ​ | ​ | 35.06
Outstanding at September 30, 2025 | ​ | 37 | ​ | $ | 37.55

​

Stock-based compensation cost for RSAs is measured based on the fair value of the Company’s underlying common stock on the date of grant and is recognized on a straight-line basis in the condensed consolidated statements of comprehensive income (loss) over the period during which the participant is required to perform services in exchange for the award, which is one year. At September 30, 2025, $972 of unrecognized compensation expense for RSAs is expected to be recognized over a weighted average period of approximately 0.8 years.

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

Performance Stock Units

In connection with the 2024 ecosio acquisition, current and newly hired employees of ecosio have or may receive RSUs that vest upon continuing service and performance conditions (“Performance Stock Units” or “PSUs”). These performance conditions are based upon ecosio’s monthly software revenues meeting specified annual targets over a three-year period. The annual targets are based on a range of performance targets in which grantees may earn a prorated portion of the base number of awards granted up to 100%.

The stock-compensation expense associated with the awards will be accounted for as compensation expense over the vesting periods based on the Company’s assessment of the probability of achieving the targets. If the required conditions are not met, no compensation expense is recognized and any previously recognized compensation expense is reversed. As of September 30, 2025, the Company determined that it is probable that the performance targets for the annual measurement periods would be achieved at varying levels across the measurement periods and has recorded $2,301 and $4,009 in stock-based compensation expense for the three and nine months ended September 30, 2025, respectively.

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​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date Fair
​ | ​ | Units | ​ | Value Per Share
Outstanding at January 1, 2025 | ​ | 192 | ​ | $ | 53.46
Granted | ​ | 28 | ​ | ​ | 35.81
Forfeited | ​ | (8) | ​ | ​ | 50.51
Outstanding at September 30, 2025 | ​ | 212 | ​ | $ | 51.25

​

At September 30, 2025, a maximum of $6,562 of unrecognized compensation expense for PSUs, pending achievement of targets, may be recognized over a weighted average period of approximately 2.2 years.

Employee Stock Purchase Plan

The ESPP provides eligible employees with rights during each six-month ESPP offering period to purchase shares of the Company’s Class A common stock through payroll deductions of up to a specified percentage of their eligible compensation. The purchase price of the shares, in the absence of a contrary designation, is 85% of the lower of the fair value of the Class A common stock on the first or last day of the ESPP offering period. Amounts withheld from participants are included in accrued salaries and benefits in the condensed consolidated balance sheets until such shares are purchased. Amounts withheld from participants for the offering period ending November 30, 2025 aggregated $2,161 as of September 30, 2025. As of September 30, 2025, 6,282 shares of Class A common stock were available for issuance under the ESPP.

As of September 30, 2025, there was approximately $280 of unrecognized ESPP stock-based compensation expense expected to be recognized on a straight-line basis over the remaining term of the six-month offering period ending November 30, 2025.

​

At September 30, 2025 and 2024, there were two ESPP offering periods open that end November 30, 2025 and 2024, respectively. The fair value of ESPP purchase rights for the offering periods is comprised of the value of the 15% ESPP discount and the value associated with the call or put over the respective ESPP offering period. ESPP offering periods

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

reported in the September 30, 2025 and 2024 financial statements include the periods noted below in the table. The value of the call or put was estimated using the Black-Scholes model with the following assumptions:

​

​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Offering Period Ending
​ | 11/30/2025 | ​ | 11/30/2024 | ​
Fair market value of common stock | $ | 39.86 | ​ | $ | 33.26 | ​
Volatility |  | 33.5 | % |  | 41.7 | %
Expected term (years) |  | 0.5 | ​ |  | 0.5 | ​
Expected dividend yield |  | - | % |  | - | %
Risk-free interest rate |  | 4.3 | % |  | 5.4 | %

​

​

Volatility is representative of expected stock price volatility over the offering period. The Company’s volatility is applied to current and future offering periods. The expected term represents the term of the ESPP offering period, which is six months. The Company does not expect to pay dividends. The risk-free interest rate was based on the rate for a U.S. Treasury zero-coupon issue with a term that closely approximates the expected term of the award at the date nearest to the offering term.

​

Stock-Based Compensation

The Company recognized total stock-based compensation expense related to incentive awards, net of forfeitures, as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
​ | ​ | 2025 |  | 2024 |  | 2025 |  | 2024
​ | ​ | (unaudited) | ​ | (unaudited)
Stock-based compensation expense: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options | ​ | $ | 111 | ​ | $ | 1,219 | ​ | $ | 532 | ​ | $ | 4,969
RSUs | ​ |  | 10,026 | ​ |  | 8,305 | ​ |  | 39,777 | ​ |  | 29,453
RSAs | ​ | ​ | 354 | ​ | ​ | 347 | ​ | ​ | 960 | ​ | ​ | 1,313
PSUs | ​ | ​ | 2,301 | ​ | ​ | — | ​ | ​ | 4,009 | ​ | ​ | —
ESPP | ​ |  | 423 | ​ |  | 263 | ​ |  | 971 | ​ |  | 724
Total stock-based compensation expense | ​ | $ | 13,215 | ​ | $ | 10,134 | ​ | $ | 46,249 | ​ | $ | 36,459

​

The Company recognized stock-based compensation expense in the condensed consolidated statements of comprehensive income as follows:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
​ | ​ | 2025 |  | 2024 |  | 2025 |  | 2024
​ | ​ | (unaudited) | ​ | (unaudited)
Stock-based compensation expense: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cost of revenues, software subscriptions | ​ | $ | 1,218 | ​ | $ | 894 | ​ | $ | 4,678 | ​ | $ | 3,437
Cost of revenues, services | ​ |  | 1,341 | ​ |  | 558 | ​ |  | 4,061 | ​ |  | 2,129
Research and development | ​ |  | 3,163 | ​ |  | 2,001 | ​ |  | 10,027 | ​ |  | 7,296
Selling and marketing | ​ |  | 3,391 | ​ |  | 2,951 | ​ |  | 12,432 | ​ |  | 10,101
General and administrative | ​ |  | 4,102 | ​ |  | 3,730 | ​ |  | 15,051 | ​ |  | 13,496
Total stock-based compensation expense | ​ | $ | 13,215 | ​ | $ | 10,134 | ​ | $ | 46,249 | ​ | $ | 36,459

​

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

12. COMMITMENTS AND CONTINGENCIES

In January 2022, the Company filed a complaint against a competitor alleging claims of unfair competition, intentional interference with contractual relations, and trade secret misappropriation. The outcome of the case is subject to a number of uncertainties; therefore, the Company has not recognized any potential impact to the condensed consolidated financial statements related to the outcome of the case. During the three and nine months ended September 30, 2025, the Company recognized $2,785 and $8,093, respectively, for legal expenses associated with the case within the other operating expense, net line of the condensed consolidated statements of income.

​

The Company may become involved in various lawsuits and legal proceedings, which arise in the ordinary course of business. However, litigation is subject to inherent uncertainties, and an adverse result in these or other matters may arise from time to time that may harm the Company’s business. The Company is not aware of any such legal proceedings or claims that management believes will have a material adverse effect on its business, financial condition, or operating results.

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13. SEGMENT DISCLOSURES

The Company operates its business as one operating segment. Operating segments are defined as components of an enterprise in which separate financial information is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and assess performance. The Company’s CODM, the Chief Executive Officer, reviews financial information regularly at the consolidated level. Net income (loss) and adjusted earnings before interest, taxes, depreciation, and amortization (“Adjusted EBITDA”), a non-GAAP measure, are both used as metrics to evaluate performance of the business in deciding whether to reinvest profits into software development, acquisitions or into other areas of the Company. The Company believes that Adjusted EBITDA is a useful supplemental measure to evaluate overall operating performance as it measures business performance by focusing on cash related results and it is an important metric to lenders under the Company’s Credit Agreement. The most directly comparable GAAP measure to Adjusted EBITDA is net income (loss).

​

The CODM monitors consolidated forecasted versus actual net income (loss) and Adjusted EBITDA results for the purpose of determining the general health of the Company and assessing the performance of the Company as compared to management’s expectations.

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

The following significant expense categories and measures of segment income (loss) are regularly reported to the CODM for the Company’s single segment:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
​ | 2025 | ​ | 2024 | ​ | 2025 | ​ | 2024
​ | (unaudited) | ​ | (unaudited)
Total Revenues | $ | 192,112 | ​ | $ | 170,435 | ​ | $ | 553,733 | ​ | $ | 488,320
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cost of revenues – software subscriptions | ​ | 50,034 | ​ | ​ | 43,641 | ​ | ​ | 138,738 | ​ | ​ | 131,030
Cost of revenues – services | ​ | 20,762 | ​ | ​ | 16,270 | ​ | ​ | 59,485 | ​ | ​ | 48,286
Research & development | ​ | 19,929 | ​ | ​ | 15,621 | ​ | ​ | 61,397 | ​ | ​ | 47,080
Selling & marketing | ​ | 47,385 | ​ | ​ | 42,111 | ​ | ​ | 143,994 | ​ | ​ | 123,143
General & administrative | ​ | 44,609 | ​ | ​ | 41,499 | ​ | ​ | 133,029 | ​ | ​ | 112,915
Depreciation & amortization | ​ | 6,372 | ​ | ​ | 5,214 | ​ | ​ | 18,439 | ​ | ​ | 15,432
Change in fair value of acquisition contingent earn-outs | ​ | (4,000) | ​ | ​ | — | ​ | ​ | (16,400) | ​ | ​ | —
Other segment items (1) | ​ | 2,701 | ​ | ​ | 1,183 | ​ | ​ | 10,109 | ​ | ​ | (442)
Interest income, net | ​ | (1,245) | ​ | ​ | (2,938) | ​ | ​ | (4,012) | ​ | ​ | (2,471)
Income tax expense (benefit) | ​ | 1,520 | ​ | ​ | 613 | ​ | ​ | (5,260) | ​ | ​ | (1,722)
Net income (GAAP) | $ | 4,045 | ​ | $ | 7,221 | ​ | $ | 14,214 | ​ | $ | 15,069
Adjustments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest income, net | ​ | (1,245) | ​ | ​ | (2,938) | ​ | ​ | (4,012) | ​ | ​ | (2,471)
Income tax expense (benefit) | ​ | 1,520 | ​ | ​ | 613 | ​ | ​ | (5,260) | ​ | ​ | (1,722)
Depreciation and amortization – property and equipment | ​ | 6,372 | ​ | ​ | 5,214 | ​ | ​ | 18,439 | ​ | ​ | 15,432
Depreciation and amortization of capitalized software and acquired intangible assets – cost of subscription revenues | ​ | 18,143 | ​ | ​ | 14,198 | ​ | ​ | 50,668 | ​ | ​ | 44,123
Amortization of acquired intangible assets – selling and marketing expense | ​ | 588 | ​ | ​ | 706 | ​ | ​ | 1,690 | ​ | ​ | 1,893
Amortization of cloud computing implementation costs – general and administrative expense | ​ | 871 | ​ | ​ | 1,005 | ​ | ​ | 2,895 | ​ | ​ | 2,994
Stock-based compensation expense | ​ | 13,215 | ​ | ​ | 10,134 | ​ | ​ | 46,249 | ​ | ​ | 36,459
Severance expense | ​ | 1,199 | ​ | ​ | 927 | ​ | ​ | 1,973 | ​ | ​ | 2,388
Acquisition contingent consideration | ​ | — | ​ | ​ | 100 | ​ | ​ | 200 | ​ | ​ | (2,275)
Change in fair value of acquisition contingent earn-outs | ​ | (4,000) | ​ | ​ | — | ​ | ​ | (16,400) | ​ | ​ | —
Transaction costs (2) | ​ | 2,785 | ​ | ​ | 1,443 | ​ | ​ | 8,425 | ​ | ​ | 1,991
Adjusted EBITDA (Non-GAAP) | $ | 43,493 | ​ | $ | 38,623 | ​ | $ | 119,081 | ​ | $ | 113,881
(1) Other segment items include professional fees, contracted labor, transaction costs, acquisition related earn-out adjustments and foreign currency exchange gains (losses).
(2) The current year periods include legal expenses associated with pending litigation related to claims the Company has made against a competitor. For further information, refer to Note 12, “Commitments and Contingencies” to the condensed consolidated financial statements.

​

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

Additionally, the Company considers stock-based compensation expense a significant expense category. For further information, refer to Note 11, “Stock Based Award Plans.”

​

As the Company operates solely within one segment, total assets, property and equipment, net, and capitalized software, net are reported at the consolidated level on the condensed consolidated balance sheets. The Company’s assets include both current and long-lived assets, and corporate assets. As of September 30, 2025 and December 31, 2024, $1,378 and $687, respectively, of the Company’s property and equipment assets were held outside of the U.S.

​

Depreciation and amortization, property and equipment additions, and capital software additions are reported at the consolidated level on the condensed consolidated statements of cash flows.

​

The Company disaggregates revenue from contracts with customers based on geographical regions, timing of revenue recognition, and the major product and service types. For both the three and nine months ended September 30, 2025 approximately 9% of the Company’s revenues were generated from customers located outside of the U.S. For the three and nine months ended September 30, 2024, approximately 8% and 7%, respectively, of the Company’s revenues were generated from customers located outside the U.S. None of the Company’s customers represented more than 10% of total revenues for the three or nine months ended September 30, 2025 or 2024. For further information including disaggregation of revenues, refer to Note 2, “Revenue Recognition.”

​

14. INCOME TAXES

The Company reported income tax expense (benefit) of $1,520 and $613 for the three months ended September 30, 2025 and 2024, respectively, and $(5,260) and $(1,722) for the nine months ended September 30, 2025 and 2024, respectively. The effective income tax rate was 27.3% for the three months ended September 30, 2025, compared to 7.8% for the three months ended September 30, 2024, and (58.7)% for the nine months ended September 30, 2025, compared to (12.9)% for the nine months ended September 30, 2024.

In determining interim provisions for income taxes, the Company uses the annual estimated effective tax rate applied to the actual year-to-date income (loss) adjusted for discrete items arising year-to-date. The Company’s effective tax rate differs from the U.S. federal statutory rate of 21% primarily due to state taxes, foreign taxes, tax benefits on the exercises and vesting of stock awards, tax credits, limitations on deductions of certain employees’ compensation under Internal Revenue Code Section 162(m), fluctuations in valuation allowances on net deferred tax assets established for U.S. and certain foreign jurisdictions, and fluctuations in nondeductible contingent consideration liabilities.

​

The income tax expense for the three months ended September 30, 2025 was primarily attributable to taxes in profitable jurisdictions and fluctuations in valuation allowance on net deferred tax assets established for U.S. and certain foreign jurisdictions. This income tax expense was partially offset by fluctuations in tax credits and nondeductible contingent consideration liabilities. The income tax benefit for the nine months ended September 30, 2025 was primarily attributable to tax benefits from stock-based awards exercised or vested, tax credits, and fluctuations in nondeductible contingent consideration liabilities. These were partially offset by limitations on deductions of certain employees’ compensation, fluctuations in valuation allowances on net deferred tax assets established for U.S. and certain foreign jurisdictions, and taxes in profitable jurisdictions. The income tax expense for the three months ended September 30, 2024 was primarily attributable to income tax expense from profitable jurisdictions and on income allocated to state jurisdictions. This income tax expense was partially offset by tax benefits from stock-based awards exercised or vested during the quarter, net of the impact from limitations on deductions of certain employees’ compensation, and benefits from tax credits. The income tax benefit for the nine months ended September 30, 2024 was primarily attributable to tax benefits from stock-based awards exercised or vested, as well as tax credits. This income tax benefit was partially offset by limitations on deductions of certain employees’ compensation, which were greater than the income tax expense recognized during the three months ended September 30, 2024, as well as taxes in profitable jurisdictions.

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Vertex, Inc. and Subsidiaries
Notes to Condensed Consolidated Financial Statements (unaudited) continued
(Amounts in thousands, except per share data) ​

​

On July 4, 2025, the One Big Beautiful Bill Act (the “OBBBA”) was enacted into law in the U.S. Among other things, the OBBBA amends U.S. tax law, including provisions related to research and development, bonus depreciation, interest expense limitation, charitable contributions, and foreign derived intangible income. The Company has accounted for the impact of the OBBBA on its condensed consolidated financial statements in the three months ended September 30, 2025. The OBBBA did not have a material impact on the Company’s U.S. income taxes.

15. SUBSEQUENT EVENTS

​

On October 21, 2025, the Company announced that David DeStefano, the Company’s Chief Executive Officer, President and Chairperson of the Board, will retire as an executive officer of the Company effective as of November 10, 2025. In connection with Mr. DeStefano’s retirement, the Board appointed Christopher Young as Chief Executive Officer, President and a Class III director of the Company effective as of November 10, 2025.

​

On October 30, 2025, the Board authorized a stock repurchase program for up to $150,000 of the Company's outstanding shares of Class A common stock (the “Repurchase Program”). Under the Repurchase Program, share repurchases may be made from time to time in one or more open market or privately negotiated transactions, and/or through other legally permissible means in accordance with applicable rules and regulations promulgated under the Exchange Act. The timing and amount of any shares repurchased will be determined by the Company's management based on its evaluation of market conditions and other factors. Repurchases may also be made under a Rule 10b5-1 plan, which would permit shares to be repurchased when the Company might otherwise be precluded from doing so under insider trading laws. Any repurchased shares will be available for use in connection with the Company’s stock plans and for other corporate purposes. The Repurchase Program has no termination date and may be modified, suspended or discontinued at any time.

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Item 2. | MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

You should read the following discussion and analysis of our financial condition and results of operations in conjunction with the condensed consolidated financial statements and the notes thereto included elsewhere in this Quarterly Report on Form 10-Q, as well as our audited consolidated financial statements and related notes as disclosed in our Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on February 27, 2025 (the “2024 Annual Report”). In addition to historical financial information, the following discussion contains forward-looking statements that reflect our plans, estimates, beliefs, and expectations that involve risks and uncertainties. Our actual results and the timing of events could differ materially from those discussed in the forward-looking statements. Factors that could cause or contribute to these differences include those discussed below and elsewhere in this Quarterly Report on Form 10-Q, particularly in the section titled “Special Note Regarding Forward-Looking Statements” above, and in Part I, Item 1A of the 2024 Annual Report and as may be subsequently updated by our other SEC filings.

Overview

Vertex is a leading global provider of indirect tax solutions. Our mission is to deliver the most trusted tax technology enabling global businesses to transact, comply and grow with confidence. Vertex provides solutions that can be tailored to specific industries for major lines of indirect tax, including sales and consumer use, value added and payroll. Headquartered in North America, and with offices in South America and Europe, Vertex empowers the world’s leading brands to simplify the complexity of continuous compliance. Vertex employs over 1,900 professionals and serves companies across the globe.

We derive the majority of our revenue from software subscriptions. These subscriptions include use of our software and ongoing monthly content updates. Our software is offered on a subscription basis to our customers, regardless of their deployment preferences. On-premise subscriptions are typically sold through one-year contracts, and cloud-based subscriptions are typically sold through one- to three-year contracts. We bill the majority of our customers annually in advance of the subscription period.

Our customers include a majority of the Fortune 500, as well as a majority of the top 10 companies by revenue in multiple industries such as retail, technology, and manufacturing, in addition to leading marketplaces. As our customers expand geographically and pursue omnichannel business models, their tax determination and compliance requirements increase and become more complex, providing sustainable organic growth opportunities for our business. Our flexible, tiered transaction-based pricing model also results in our customers growing their spend with us as they grow and continue to use our solutions. We principally price our solutions based on a customer’s revenue base, in addition to a number of other factors.

We employ a hybrid deployment model to align to our customers’ technology preferences for their core financial management software across on-premise, cloud deployments or any combination of these models. Over time, we expect both existing and newly acquired customers to continue to shift towards cloud deployment models. Cloud-based subscription sales to new customers have grown at a faster rate than on-premise software subscription sales, which is a trend that we expect to continue over time. We generated 56% and 49% of software subscription revenue from cloud-based subscriptions during the three months ended September 30, 2025 and 2024, respectively, and 55% and 48% for the nine months ended September 30, 2025 and 2024, respectively. While our on-premise software subscription revenue comprised 44% and 51% of our software subscription revenue during the three months ended September 30, 2025 and 2024, respectively, and 45% and 52% during the nine months ended September 30, 2025 and 2024, respectively, it continues to decrease as a percentage of total software subscriptions revenues as cloud-based subscriptions grow.

We license our solutions primarily through our direct sales force, which focuses on selling to qualified leads provided by our marketing efforts, and through our network of referral partners. We also utilize indirect sales to a lesser extent to efficiently grow and scale our enterprise and mid-market revenues.

Our partner ecosystem is a differentiating, competitive strength in both our software development and our sales and marketing activities. We integrate with key technology partners that span Enterprise Resource Planning (“ERP”),

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Customer Relationship Management, procurement, billing, Point of Sale and e-commerce. These partners include Adobe/Magento, Coupa, Microsoft Dynamics, NetSuite, Oracle, Salesforce, SAP, SAP Ariba, Shopify, Workday and Zuora. We also collaborate with numerous accounting firms who have built implementation practices around our software to serve their customer base.

We believe that global commerce and the compliance environment provides durable and accelerating growth opportunities for our business. We generated revenue of $192.1 million and $170.4 million for the three months ended September 30, 2025 and 2024, respectively, and $553.7 million and $488.3 million for the nine months ended September 30, 2025 and 2024, respectively. We had net income of $4.0 million and $7.2 million for the three months ended September 30, 2025 and 2024, respectively, and $14.2 million and $15.1 million for the nine months ended September 30, 2025 and 2024, respectively. These amounts are presented in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”).

We define Adjusted EBITDA as net loss or income before interest (including adjustments to the settlement value of deferred purchase commitment liabilities), taxes, depreciation, and amortization, as adjusted to exclude charges for stock-based compensation expense, amortization of cloud computing arrangement implementation costs, severance expense, acquisition contingent consideration, changes in the fair value of acquisition contingent earn-outs, changes in the settlement value of deferred purchase commitment liabilities recorded as interest expense, and transaction costs. Adjusted EBITDA was $43.5 million and $38.6 million for the three months ended September 30, 2025 and 2024, respectively, and $119.1 million and $113.9 million for the nine months ended September 30, 2025 and 2024, respectively. Adjusted EBITDA is a non-GAAP financial measure. Refer to “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Business Metrics” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Use and Reconciliation of Non-GAAP Financial Measures” for further discussion of key business metrics and non-GAAP financial measures and their comparison to GAAP financial measures.

We believe that we currently have ample liquidity and capital resources to continue to meet our operating needs, and our ability to continue to service our debt or other financial obligations is not currently impaired. For a further description of our liquidity, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.”

Recent Developments

On October 21, 2025, we announced that David DeStefano, our Chief Executive Officer, President and Chairperson of the board of directors of the Company (the “Board”), will retire as an executive officer effective as of November 10, 2025. In connection with Mr. DeStefano’s retirement, the Board appointed Christopher Young as Chief Executive Officer, President and a Class III director effective as of November 10, 2025.

​

On October 30, 2025, the Board authorized a stock repurchase program for up to $150.0 million of our outstanding shares of Class A common stock (the “Repurchase Program”). Under the Repurchase Program, share repurchases may be made from time to time in one or more open market or privately negotiated transactions, and/or through other legally permissible means in accordance with applicable rules and regulations promulgated under the Exchange Act. The timing and amount of any shares repurchased will be determined by management based on evaluation of market conditions and other factors. Repurchases may also be made under a Rule 10b5-1 plan, which would permit shares to be repurchased when we might otherwise be precluded from doing so under insider trading laws. Any repurchased shares will be available for use in connection with our stock plans and for other corporate purposes. The Repurchase Program has no termination date and may be modified, suspended or discontinued at any time.

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Components of Our Results of Operations

Revenue

We generate revenue from software subscriptions and services.

Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration expected to be received in exchange for those products or services. We enter into contracts that include various combinations of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of allowance for subscription and non-renewal cancellations and any taxes collected from customers that are subsequently remitted to governmental authorities.

Software Subscriptions

Licenses for on-premise software subscriptions provide the customer with a right to use the software as it exists when made available to the customer. Customers purchase a subscription to these licenses, which includes the related software and tax content updates and product support. The updates and support, which are part of the subscription agreement, are essential to the continued utility of the software; therefore, we have determined the software and the related updates and support to be a single performance obligation. Accordingly, when on-premise software is licensed, the revenue associated with this combined performance obligation is recognized ratably over the license term as these subscriptions are provided for the duration of the license term. Revenue recognition begins on the later of the beginning of the subscription period or the date the software is made available to the customer to download.

Our cloud-based subscriptions allow customers to use Vertex-hosted software over the contract period without taking possession of the software. The contracts are generally for one to three years and are generally billed annually in advance of the subscription period. Our cloud-based offerings also include related updates and support. Revenue recognition begins on the later of the beginning of the subscription period or the date the customer is provided access to the cloud-based solutions. All services within the cloud-based contracts consistently provide a benefit to the customer during the subscription period; thus, the associated revenue is recognized ratably over the subscription period.

Revenue is impacted by the timing of sales and our customers’ growth or contractions resulting in their need to expand or contract their subscription usage, the purchase of new solutions, or the non-renewal of existing solutions. In addition, revenue will fluctuate with the cessation of extended product support fees charged for older versions of our software subscription solutions when they are retired and these fees are no longer charged. Contracts for on-premise licenses permit cancellations at the end of the license term. Legacy cloud-based subscription contracts for multi-year periods previously provided customers the right to terminate their contract for services prior to the end of the subscription period at a significant penalty. This penalty requires the payment of a percentage of the remaining months of the then-current contract term. Current cloud-based contracts do not contain such termination rights. Terminations of cloud-based subscriptions prior to the end of the subscription term have occurred infrequently, and the impact has been immaterial. The allowance for subscription and non-renewal cancellations reflects an estimate of the amount of such cancellations and non-renewals based on past experience, current information, and forward-looking economic considerations.

Services Revenue

We generate services revenue primarily in support of our customers’ needs associated with our software and to enable them to realize the full benefit of our solutions. These software subscription-related services include configuration, data migration and implementation, and premium support and training. In addition, we generate services revenue through our managed services offering which allows customers to outsource all or a portion of their indirect tax operations to us. These services include indirect tax return preparation, filing and tax payment, and notice management. We generally bill for services on a per-transaction or time and materials basis, and we recognize revenue from deliverable-based professional services as services are performed.

Fluctuations in services revenue are directly correlated to fluctuations in our subscription revenues with respect to implementation and training services as we have historically experienced an attachment rate to subscription sales for these

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services of approximately 60%. In addition, our managed services offering has continued to experience increased revenues associated with returns processing volume increases attributable to regulatory changes, as customers expanded their tax filings into more jurisdictions.

Cost of Revenue

Software Subscriptions

Cost of software subscriptions revenue consists of costs related to providing and supporting our software subscriptions and includes personnel and related expenses, including salaries, benefits, bonuses, and stock-based compensation. In addition, cost of revenue includes direct costs associated with information technology, such as data center and software hosting costs, and tax content maintenance. Cost of software subscriptions revenue also includes amortization associated with capitalized internal-use software for cloud-based subscription solutions and software developed for sale for new products and enhancements to existing products, and costs associated with the amortization of certain acquired intangible assets. We plan to continue to significantly expand our infrastructure and personnel to support our future growth and increases in transaction volumes of our cloud-based solutions, including through acquisitions. We expect growth in our business will result in an increase in cost of software subscriptions revenue in absolute dollars.

Services

Cost of services revenue consists of direct costs of software subscription-related services and our managed services offering. These costs include personnel and related expenses, including salaries, benefits, bonuses, stock-based compensation, and the cost of third-party contractors and other direct expenses. We plan to continue to expand our infrastructure and personnel as necessary to support our future growth in our managed service offerings and related increases in our service revenue. We expect growth in our business will result in an increase in the cost of services revenue in absolute dollars.

Research and Development

Research and development expenses consist primarily of personnel and related expenses for our research and development activities, including salaries, benefits, bonuses and stock-based compensation, and the cost of third-party developers and other contractors. Research and development costs, other than software development expenses qualifying for capitalization, are expensed as incurred.

We devote substantial resources to developing new products and enhancing existing products, conducting quality assurance testing, improving our core technology, and integrating acquired technology with our products. We believe continued investments in research and development are critical to attain our strategic objectives and expect research and development costs to increase in absolute dollars. These investments include enhancing our solution offerings to address changing customer needs to support their growth, as well as implementing changes required to keep pace with our partners’ technology to ensure the continued ability of our solutions to work together and deliver value to our customers. The market for our solutions is characterized by rapid technological change, frequent new product and service introductions and enhancements, changing customer demands, and evolving industry standards. As a result, although we are making significant research and development expenditures, certain of which may be capitalized, there is no guarantee these solutions will be accepted by the market. This could result in increased costs or an impairment of capitalized development costs with no resulting future revenue benefit.

Selling and Marketing Expenses

Selling and marketing expenses consist primarily of personnel and related expenses in support of sales and marketing efforts. These costs include salaries, benefits, bonuses and stock-based compensation. In addition, selling and marketing expenses include costs related to advertising and promotion efforts, branding costs, partner-based commissions, costs associated with our annual customer conferences and amortization of certain acquired intangible assets. We intend to continue to invest in our sales and marketing capabilities in the future to continue to increase our brand awareness and expect these costs to increase on an absolute dollar basis as we grow our business and continue to expand our market and

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partner ecosystem penetration. Sales and marketing expense in absolute dollars and as a percentage of total revenue may fluctuate from period-to-period based on total revenue levels and the timing of our investments in our sales and marketing functions, as these investments will occur in advance of experiencing the benefits from such investments and may vary in scope and scale over future periods.

General and Administrative

General and administrative expenses consist primarily of personnel and related expenses for administrative, finance, information technology, legal, risk management, facilities, and human resources staffing, including salaries, benefits, bonuses, severance, stock-based compensation, professional fees, insurance premiums, facility costs, amortization of cloud computing arrangement implementation costs, and other internal support and infrastructure costs.

We expect our general and administrative expenses to increase in absolute dollars as we continue to expand our operations, hire additional personnel, and integrate current and future acquisitions.

Depreciation and Amortization

Depreciation and amortization expense consists of the allocation of purchased and developed asset costs over the future periods benefitted by the use of these assets. These assets include leasehold improvements for our facilities, computers and equipment needed to support our customers and our internal infrastructure and capitalized internal-use software associated with our internal tools. Depreciation and amortization will fluctuate in correlation with our ongoing investment in internal infrastructure costs to support our growth.

Change in Fair Value of Acquisition Contingent Earn-Outs

In connection with our acquisition of ecosio GmbH (“ecosio”) in August 2024, the sellers are entitled to three annual earn-outs in the form of cash, with an aggregate value of up to $94.4 million (the “Cash Earn-outs”), and stock, with an aggregate value of up to $35.0 million (the “Stock Earn-outs,” and together with the Cash Earn-outs, the “Earn-outs”), assuming maximum payouts. The Earn-outs are based on ecosio’s achievement of certain monthly software revenue targets over a three-year period, measured over an aggregate of 12 months and paid within 90 days after the relevant measurement period. The change in fair value of acquisition contingent earn-outs consists of fair value adjustments to our Earn-outs, which will be revalued and adjusted quarterly until the end of the Earn-out periods.

Other Operating Expense (Income), net

Other operating expense (income), net consists primarily of transactions costs associated with merger and acquisition activities, periodic remeasurement of contingent consideration associated with completed acquisitions, realized gains and losses on foreign currency changes, and other operating gains and losses. These amounts will fluctuate as a result of ongoing merger and acquisition activities and for changes in foreign currency rates.

Interest Expense (Income), net

Interest expense (income), net reflects the net amount of our interest expense and interest income within the same period.

Interest expense consists primarily of interest incurred related to the Notes (as defined below), a term loan in the aggregate amount of $50.0 million (the “Term Loan”), Credit Agreement (as defined below), and leases. Interest expense includes amortization of deferred financing fees over the term of the credit facility or write-downs of such costs upon redemption of debt. Interest expense will vary as a result of fluctuations in the level of debt outstanding as well as interest rates on such debt. In addition, interest expense will include adjustments to the fair value of contracts that may be entered into to hedge risks associated with currency fluctuations for cash receipts or cash payments denominated in currencies other than U.S. dollars and which do not qualify for hedge accounting, as well as changes in the settlement value of the future payment obligation for the Systax Sistemas Fiscais LTDA (“Systax”) acquisition, which was fully settled on June 5, 2024. Interest income reflects earnings on investments of our cash on hand and our investment securities. Interest income

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will vary as a result of fluctuations in the future level of funds available for investment and the rate of return available in the market on such funds.

Income Tax Expense (Benefit)

​

Income tax expense (benefit) consists primarily of federal, foreign, state, and local taxes on our loss or income. In determining our annualized effective income tax rates, net deferred tax assets, valuation allowances, and cash paid for income taxes, we are required to make judgments and estimates about domestic and foreign profitability, the timing and usage of net operating loss and credit carryforwards, applicable tax rates, and transfer pricing methodologies. Judgments and estimates related to our projections and assumptions are inherently uncertain; therefore, actual results could materially differ from our projections.

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Results of Operations

You should read the following discussion and analysis of our financial condition and results of operations in conjunction with our condensed consolidated financial statements and the notes thereto included elsewhere in this Quarterly Report on Form 10-Q, and our consolidated financial statements and the notes thereto included in our 2024 Annual Report. The period-to-period comparison of financial results is not necessarily indicative of financial results to be achieved in future periods. The following table sets forth our condensed consolidated statements of comprehensive income for the periods indicated.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 | ​ | Period-Over-Period Change | ​ | ​ | 2025 |  | 2024 | ​ | Period-Over-Period Change | ​
​ | ​ | (unaudited) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (unaudited) | ​ | ​ | ​ | ​ | ​ | ​
Revenues: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Software subscriptions | ​ | $ | 164,824 |  | $ | 146,254 | ​ | $ | 18,570 |  | 12.7 | % |  | $ | 473,429 |  | $ | 414,527 | ​ | $ | 58,902 |  | 14.2 | %
Services | ​ | ​ | 27,288 | ​ | ​ | 24,181 | ​ | ​ | 3,107 | ​ | 12.8 | % | ​ | ​ | 80,304 | ​ | ​ | 73,793 | ​ | ​ | 6,511 | ​ | 8.8 | %
Total revenues | ​ | ​ | 192,112 | ​ | ​ | 170,435 | ​ | ​ | 21,677 | ​ | 12.7 | % | ​ | ​ | 553,733 | ​ | ​ | 488,320 | ​ | ​ | 65,413 | ​ | 13.4 | %
Cost of revenues: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Software subscriptions (1) | ​ | ​ | 50,034 | ​ | ​ | 43,641 | ​ | ​ | 6,393 | ​ | 14.6 | % | ​ | ​ | 138,738 | ​ | ​ | 131,030 | ​ | ​ | 7,708 | ​ | 5.9 | %
Services (1) | ​ | ​ | 20,762 | ​ | ​ | 16,270 | ​ | ​ | 4,492 | ​ | 27.6 | % | ​ | ​ | 59,485 | ​ | ​ | 48,286 | ​ | ​ | 11,199 | ​ | 23.2 | %
Total cost of revenues | ​ | ​ | 70,796 | ​ | ​ | 59,911 | ​ | ​ | 10,885 | ​ | 18.2 | % | ​ | ​ | 198,223 | ​ | ​ | 179,316 | ​ | ​ | 18,907 | ​ | 10.5 | %
Gross profit | ​ | ​ | 121,316 | ​ | ​ | 110,524 | ​ | ​ | 10,792 | ​ | 9.8 | % | ​ | ​ | 355,510 | ​ | ​ | 309,004 | ​ | ​ | 46,506 | ​ | 15.1 | %
Operating expenses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Research and development (1) | ​ | ​ | 19,929 | ​ | ​ | 15,621 | ​ | ​ | 4,308 | ​ | 27.6 | % | ​ | ​ | 61,397 | ​ | ​ | 47,080 | ​ | ​ | 14,317 | ​ | 30.4 | %
Selling and marketing (1) | ​ | ​ | 47,385 | ​ | ​ | 42,111 | ​ | ​ | 5,274 | ​ | 12.5 | % | ​ | ​ | 143,994 | ​ | ​ | 123,143 | ​ | ​ | 20,851 | ​ | 16.9 | %
General and administrative (1) | ​ | ​ | 44,609 | ​ | ​ | 41,499 | ​ | ​ | 3,110 | ​ | 7.5 | % | ​ | ​ | 133,029 | ​ | ​ | 112,915 | ​ | ​ | 20,114 | ​ | 17.8 | %
Depreciation and amortization | ​ | ​ | 6,372 | ​ | ​ | 5,214 | ​ | ​ | 1,158 | ​ | 22.2 | % | ​ | ​ | 18,439 | ​ | ​ | 15,432 | ​ | ​ | 3,007 | ​ | 19.5 | %
Change in fair value of acquisition contingent earn-outs | ​ | ​ | (4,000) | ​ | ​ | — | ​ | ​ | (4,000) | ​ | * | ​ | ​ | ​ | (16,400) | ​ | ​ | — | ​ | ​ | (16,400) | ​ | * | ​
Other operating expense (income), net | ​ | ​ | 2,701 | ​ | ​ | 1,183 | ​ | ​ | 1,518 | ​ | * | ​ | ​ | ​ | 10,109 | ​ | ​ | (442) | ​ | ​ | 10,551 | ​ | * | ​
Total operating expenses | ​ | ​ | 116,996 | ​ | ​ | 105,628 | ​ | ​ | 11,368 | ​ | 10.8 | % | ​ | ​ | 350,568 | ​ | ​ | 298,128 | ​ | ​ | 52,440 | ​ | 17.6 | %
Income from operations | ​ | ​ | 4,320 | ​ | ​ | 4,896 | ​ | ​ | (576) | ​ | (11.8) | % | ​ | ​ | 4,942 | ​ | ​ | 10,876 | ​ | ​ | (5,934) | ​ | (54.6) | %
Interest income, net | ​ | ​ | (1,245) | ​ | ​ | (2,938) | ​ | ​ | 1,693 | ​ | * | ​ | ​ | ​ | (4,012) | ​ | ​ | (2,471) | ​ | ​ | (1,541) | ​ | * | ​
Income before income taxes | ​ | ​ | 5,565 | ​ | ​ | 7,834 | ​ | ​ | (2,269) | ​ | (29.0) | % | ​ | ​ | 8,954 | ​ | ​ | 13,347 | ​ | ​ | (4,393) | ​ | (32.9) | %
Income tax expense (benefit) | ​ | ​ | 1,520 | ​ | ​ | 613 | ​ | ​ | 907 | ​ | * | ​ | ​ | ​ | (5,260) | ​ | ​ | (1,722) | ​ | ​ | (3,538) | ​ | * | ​
Net income | ​ | ​ | 4,045 | ​ | ​ | 7,221 | ​ | ​ | (3,176) | ​ | (44.0) | % | ​ | ​ | 14,214 | ​ | ​ | 15,069 | ​ | ​ | (855) | ​ | (5.7) | %
Other comprehensive (income) loss: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Foreign currency translation adjustments, net of tax | ​ | ​ | (286) | ​ | ​ | (8,955) | ​ | ​ | 8,669 | ​ | (96.8) | % | ​ | ​ | (45,125) | ​ | ​ | (1,609) | ​ | ​ | (43,516) | ​ | 2,704.5 | %
Unrealized loss (gain) on investments, net of tax | ​ | ​ | — | ​ | ​ | (24) | ​ | ​ | 24 | ​ | * | ​ | ​ | ​ | 9 | ​ | ​ | (26) | ​ | ​ | 35 | ​ | * | ​
Total other comprehensive income, net of tax | ​ | ​ | (286) | ​ | ​ | (8,979) | ​ | ​ | 8,693 | ​ | * | ​ | ​ | ​ | (45,116) | ​ | ​ | (1,635) | ​ | ​ | (43,481) | ​ | * | ​
Total comprehensive income | ​ | $ | 4,331 | ​ | $ | 16,200 | ​ | $ | (11,869) | ​ | (73.3) | % | ​ | $ | 59,330 | ​ | $ | 16,704 | ​ | $ | 42,626 | ​ | 255.2 | %

| (1) | Includes stock-based compensation expenses as follows in the table below.

* Percentage change not meaningful.

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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | For the three months ended | ​ | For the nine months ended
​ | September 30, | ​ | September 30,
(Dollars in thousands) | 2025 |  | 2024 | ​ | 2025 |  | 2024
​ | (unaudited) | ​ | (unaudited)
Stock-based compensation expense: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cost of revenues, software subscriptions | $ | 1,218 | ​ | $ | 894 | ​ | $ | 4,678 | ​ | $ | 3,437
Cost of revenues, services |  | 1,341 | ​ |  | 558 | ​ |  | 4,061 | ​ |  | 2,129
Research and development |  | 3,163 | ​ |  | 2,001 | ​ |  | 10,027 | ​ |  | 7,296
Selling and marketing |  | 3,391 | ​ |  | 2,951 | ​ |  | 12,432 | ​ |  | 10,101
General and administrative |  | 4,102 | ​ |  | 3,730 | ​ |  | 15,051 | ​ |  | 13,496
Total stock-based compensation expense | $ | 13,215 | ​ | $ | 10,134 | ​ | $ | 46,249 | ​ | $ | 36,459

​

​

The following table sets forth our results of operations as a percentage of our total revenues for the periods presented.

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | ​ | For the nine months ended September 30, | ​
​ |  | 2025 |  | 2024 |  | ​ | 2025 |  | 2024 | ​
​ | ​ | (unaudited) |  | ​ | (unaudited) | ​
Revenues: |  |  |  |  | ​ | ​ |  |  |  | ​
Software subscriptions |  | 85.8 | % | 85.8 | % | ​ | 85.5 | % | 84.9 | %
Services |  | 14.2 | % | 14.2 | % | ​ | 14.5 | % | 15.1 | %
Total revenues |  | 100.0 | % | 100.0 | % | ​ | 100.0 | % | 100.0 | %
Cost of revenues: |  |  |  |  | ​ | ​ |  |  |  | ​
Software subscriptions |  | 26.0 | % | 25.6 | % | ​ | 25.1 | % | 26.8 | %
Services |  | 10.8 | % | 9.5 | % | ​ | 10.7 | % | 9.9 | %
Total cost of revenues |  | 36.8 | % | 35.1 | % | ​ | 35.8 | % | 36.7 | %
Gross profit |  | 63.2 | % | 64.9 | % | ​ | 64.2 | % | 63.3 | %
Operating expenses: |  |  |  |  | ​ | ​ |  |  |  | ​
Research and development |  | 10.4 | % | 9.2 | % | ​ | 11.1 | % | 9.6 | %
Selling and marketing |  | 24.7 | % | 24.7 | % | ​ | 26.0 | % | 25.2 | %
General and administrative |  | 23.2 | % | 24.3 | % | ​ | 24.0 | % | 23.1 | %
Depreciation and amortization |  | 3.3 | % | 3.1 | % | ​ | 3.3 | % | 3.2 | %
Change in fair value of acquisition contingent earn-outs | ​ | (2.1) | % | — | % | ​ | (3.0) | % | — | %
Other operating expense (income), net |  | 1.4 | % | 0.7 | % | ​ | 1.8 | % | (0.1) | %
Total operating expenses |  | 60.9 | % | 62.0 | % | ​ | 63.2 | % | 61.0 | %
Income from operations |  | 2.3 | % | 2.9 | % | ​ | 1.0 | % | 2.3 | %
Interest income, net |  | (0.6) | % | (1.7) | % | ​ | (0.7) | % | (0.5) | %
Income before income taxes |  | 2.9 | % | 4.6 | % | ​ | 1.7 | % | 2.8 | %
Income tax expense (benefit) |  | 0.8 | % | 0.4 | % | ​ | (0.9) | % | (0.4) | %
Net income |  | 2.1 | % | 4.2 | % | ​ | 2.6 | % | 3.2 | %
Other comprehensive (income) loss: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Foreign currency translation adjustments, net of tax | ​ | (0.1) | % | (5.3) | % | ​ | (8.1) | % | (0.3) | %
Unrealized loss (gain) on investments, net of tax | ​ | — | % | — | % | ​ | — | % | — | %
Total other comprehensive income, net of tax |  | (0.1) | % | (5.3) | % | ​ | (8.1) | % | (0.3) | %
Total comprehensive income |  | 2.2 | % | 9.5 | % | ​ | 10.7 | % | 3.5 | %

​

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Three Months Ended September 30, 2025 Compared to Three Months Ended September 30, 2024

Revenues

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
​ | ​ | (unaudited) | ​ | ​ | ​ | ​ | ​ | ​
Revenues: |  | ​ |  |  | ​ |  |  | ​ |  |  |  | ​
Software subscriptions | ​ | $ | 164,824 | ​ | $ | 146,254 | ​ | $ | 18,570 |  | 12.7 | %
Services | ​ |  | 27,288 | ​ |  | 24,181 | ​ |  | 3,107 |  | 12.8 | %
Total revenues | ​ | $ | 192,112 | ​ | $ | 170,435 | ​ | $ | 21,677 | ​ | 12.7 | %

​

Revenues increased $21.7 million, or 12.7%, to $192.1 million for the three months ended September 30, 2025 compared to $170.4 million for the same period in 2024. The increase in software subscriptions revenues of $18.6 million, or 12.7%, was primarily driven by increases from our existing customers through cross-selling new products, and to a lesser extent, increases due to expanded use and price increases. Software subscriptions revenues derived from new customers averaged 5.9% and 6.0% of total software subscriptions revenues in the three months ended September 30, 2025 and 2024, respectively.

​

The $3.1 million increase in services revenues was primarily driven by a $1.8 million increase in recurring services revenues due to returns processing volume increases related to customer business growth and regulatory changes as customers expanded their tax filings into more jurisdictions, as well as an increase in interest received from our funds held for customers. Additionally, our managed services offering experienced a $1.3 million increase in service revenues associated with the growth in subscription revenues, which includes new customers implementing our solutions and existing customers upgrading to newer versions of our solutions.

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Cost of Software Subscriptions Revenues

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
Cost of software subscriptions revenues | ​ | $ | 50,034 | ​ | $ | 43,641 | ​ | $ | 6,393 |  | 14.6 | %

​

Cost of software subscriptions revenues increased $6.4 million, or 14.6%, to $50.0 million for the three months ended September 30, 2025 compared to $43.6 million for the same period in 2024. The increase was primarily driven by a $3.9 million increase in depreciation and amortization of capitalized software and acquired intangible assets associated with our ongoing investments in internal-use software for cloud-based subscription solutions, software developed for sale for new products and enhancements to existing products, and costs associated with the increased amortization of acquired intangible assets. Additionally, there was a $2.4 million increase in costs of personnel supporting period-over-period growth of sales and customers, ongoing infrastructure investments and support costs to enable the continued expansion of customer transaction volumes for our cloud-based subscription customers.

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Cost of Services Revenues

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
Cost of services revenues | ​ | $ | 20,762 | ​ | $ | 16,270 | ​ | $ | 4,492 |  | 27.6 | %

​

Cost of services revenues increased $4.5 million, or 27.6%, to $20.8 million for the three months ended September 30, 2025, compared to $16.3 million for the same period in 2024. The increase was primarily due to an increase in costs of service delivery personnel to support revenue growth in software subscription-related services and our managed services offering.

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Research and Development

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
Research and development | ​ | $ | 19,929 | ​ | $ | 15,621 | ​ | $ | 4,308 |  | 27.6 | %

​

Research and development expenses increased $4.3 million, or 27.6%, to $19.9 million for the three months ended September 30, 2025 compared to $15.6 million for the same period in 2024. This increase in research and development expenses was primarily due to an increase in personnel costs related to development work associated with new solutions to address end-to-end data analysis and compliance needs of our customers, and continued expansion of connectors and application program interfaces to customer ERP and other software platforms. Additionally, this increase reflects additional research and development investments related to the commercialization of our AI-based Smart Categorization product, other AI-related internal tools and new product initiatives, and other emerging technologies.

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Selling and Marketing

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
Selling and marketing | ​ | $ | 47,385 | ​ | $ | 42,111 | ​ | $ | 5,274 |  | 12.5 | %

​

Selling and marketing expenses increased $5.3 million, or 12.5%, to $47.4 million for the three months ended September 30, 2025 compared to $42.1 million for the same period in 2024. This increase was primarily driven by a $4.2 million increase in payroll and related expenses associated with the growth in period-over-period subscription sales and services revenues and expansion of our partner and channel management programs. Additionally, there was an increase of $1.1 million in advertising and promotional spending related to expanded brand awareness efforts.

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General and Administrative

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
General and administrative | ​ | $ | 44,609 | ​ | $ | 41,499 | ​ | $ | 3,110 |  | 7.5 | %

​

General and administrative expenses increased $3.1 million, or 7.5%, to $44.6 million for the three months ended September 30, 2025 compared to $41.5 million for the same period in 2024, primarily driven by planned strategic investments in information technology infrastructure, business process re-engineering and other initiatives to drive future operating leverage, as well as investments in employees, systems and other resources in support of our growth.

​

Depreciation and Amortization

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
Depreciation and amortization |  | $ | 6,372 |  | $ | 5,214 |  | $ | 1,158 |  | 22.2 | %

​

Depreciation and amortization expenses increased $1.2 million, or 22.2%, to $6.4 million for the three months ended September 30, 2025 compared to $5.2 million for the same period in 2024. The increase was primarily due to the impact of infrastructure and technology purchases and other capitalized costs to support our growth.

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Change in Fair Value of Acquisition Contingent Earn-outs

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | ​ | 2025 | ​ | ​ | 2024 |  | Period-Over-Period Change
Change in fair value of acquisition contingent earn-outs | ​ | $ | (4,000) | ​ | $ | — |  | $ | (4,000) |  | *
* Percentage change not meaningful. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

​

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Change in fair value of acquisition contingent earn-outs was $(4.0) million for the three months ended September 30, 2025 due entirely to adjustments to the fair values of our ecosio acquisition contingent Cash Earn-outs and Stock Earn-outs of $5.1 million and $(9.1) million, respectively. For further information, refer to Note 4, “Financial Instruments and Fair Value Measurements” to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

Other Operating Expense, Net

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
Other operating expense, net |  | $ | 2,701 |  | $ | 1,183 |  | $ | 1,518 |  | (128.3) | %

​

Other operating expense, net was $2.7 million for the three months ended September 30, 2025 compared to $1.2 million for the same period in 2024. This change was primarily driven by $2.8 million related to legal costs associated with a pending legal claim. For further information regarding the referenced pending legal claim, refer to Note 12, “Commitments and Contingencies” to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

​

Interest Income, Net

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
Interest income, net |  | $ | (1,245) |  | $ | (2,938) |  | $ | 1,693 |  | (57.6) | %

​

Interest income, net was $1.2 million for the three months ended September 30, 2025 compared to $2.9 million for the same period in 2024. This change was mainly due to a $1.6 million decrease in interest income due to decreased dollars invested and lower interest rates during the period.

​

Income Tax Expense

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Period-Over-Period Change | ​
Income tax expense |  | $ | 1,520 |  | $ | 613 |  | $ | 907 |  | 148.0 | %

​

Income tax expense was $1.5 million and $0.6 million for the three months ended September 30, 2025 and 2024, respectively. This change was primarily driven by a decreased tax benefit on exercises and vesting of stock awards recognized during the three months ended September 30, 2025, as well as income tax from fluctuations in valuation allowances on net deferred tax assets established for U.S. and certain foreign jurisdictions. These income tax expense increases were partially offset by fluctuations in nondeductible contingent consideration liabilities and taxes in profitable jurisdictions, as well as tax credits.

​

​

​

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Nine Months Ended September 30, 2025 Compared to Nine Months Ended September 30, 2024

​

Revenues

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change | ​
​ | ​ | (unaudited) | ​ | ​ | ​ | ​ | ​ | ​
Revenues: |  | ​ |  |  | ​ |  |  | ​ |  |  |  | ​
Software subscriptions | ​ | $ | 473,429 | ​ | $ | 414,527 | ​ | $ | 58,902 |  | 14.2 | %
Services | ​ |  | 80,304 | ​ |  | 73,793 | ​ |  | 6,511 |  | 8.8 | %
Total revenues | ​ | $ | 553,733 | ​ | $ | 488,320 | ​ | $ | 65,413 |  | 13.4 | %

​

Revenues increased $65.4 million, or 13.4%, to $553.7 million for the nine months ended September 30, 2025 compared to $488.3 million for the same period in 2024. The increase in software subscriptions revenues of $58.9 million, or 14.2%, was primarily driven by increases from our existing customers through cross-selling new products, and to a lesser extent, increases due to expanded use and price increases. Software subscriptions revenues derived from new customers averaged 7.4% and 5.8% of total software subscriptions revenues in the nine months ended September 30, 2025 and 2024, respectively.

​

The $6.5 million increase in services revenues was primarily driven by a $6.0 million increase in recurring services revenues due to returns processing volume increases related to customer business growth and regulatory changes as customers expanded their tax filings into more jurisdictions, as well as an increase in interest received from our funds held for customers. Additionally, there was a $0.5 million increase in software subscription-related services associated with the growth in subscription revenues, which includes new customers implementing our solutions and existing customers upgrading to newer versions of our solutions.

​

Cost of Software Subscriptions Revenues

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ |
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change |
Cost of software subscriptions revenues |  | $ | 138,738 |  | $ | 131,030 |  | $ | 7,708 |  | 5.9 | %

​

​

Cost of software subscriptions revenues increased $7.7 million, or 5.9%, to $138.7 million for the nine months ended September 30, 2025 compared to $131.0 million for the same period in 2024. The increase was primarily driven by a $6.5 million increase in depreciation and amortization of capitalized software and acquired intangible assets associated with our ongoing investments in internal-use software for cloud-based subscription solutions, software developed for sale for new products and enhancements to existing products, and costs associated with the increased amortization of acquired intangible assets. Additionally, there was a $1.2 million increase in costs of personnel supporting period-over-period growth of sales and customers, ongoing infrastructure investments and support costs to enable the continued expansion of customer transaction volumes for our cloud-based subscription customers.

​

Cost of Services Revenues

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change | ​
Cost of services revenues |  | $ | 59,485 |  | $ | 48,286 |  | $ | 11,199 |  | 23.2 | %

​

​

Cost of services revenues increased $11.2 million, or 23.2%, to $59.5 million for the nine months ended September 30, 2025, compared to $48.3 million for the same period in 2024. The increase was primarily due to an increase in costs of service delivery personnel to support revenue growth in software subscription-related services and our managed services offering.

​

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Research and Development

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ |
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change |
Research and development |  | $ | 61,397 |  | $ | 47,080 |  | $ | 14,317 |  | 30.4 | %

​

​

Research and development expenses increased $14.3 million, or 30.4%, to $61.4 million for the nine months ended September 30, 2025 compared to $47.1 million for the same period in 2024. This increase in research and development expenses was primarily due to an increase in personnel costs related to development work associated with new solutions to address end-to-end data analysis and compliance needs of our customers, and continued expansion of connectors and application program interfaces to customer ERP and other software platforms. Additionally, this increase reflects additional research and development investments related to the commercialization of our AI-based Smart Categorization product, other AI-related internal tools and new product initiatives, and other emerging technologies.

​

Selling and Marketing

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ |
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change |
Selling and marketing |  | $ | 143,994 |  | $ | 123,143 |  | $ | 20,851 |  | 16.9 | %

​

​

Selling and marketing expenses increased $20.9 million, or 16.9%, to $144.0 million for the nine months ended September 30, 2025 compared to $123.1 million for the same period in 2024. This increase was primarily driven by an $10.9 million increase in payroll and related expenses associated with the growth in period-over-period subscription sales and services revenues and expansion of our partner and channel management programs. Additionally, there was an increase of $10.0 million in advertising and promotional spending related to expanded brand awareness efforts.

​

General and Administrative

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change | ​
General and administrative |  | $ | 133,029 |  | $ | 112,915 |  | $ | 20,114 |  | 17.8 | %

​

​

General and administrative expenses increased $20.1 million, or 17.8%, to $133.0 million for the nine months ended September 30, 2025 compared to $112.9 million for the same period in 2024, primarily driven by planned strategic investments in information technology infrastructure, business process re-engineering and other initiatives to drive future operating leverage, as well as investments in employees, systems and other resources in support of our growth.

​

Depreciation and Amortization

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | 2025 |  | 2024 | ​ | Year-Over-Year Change |
Depreciation and amortization |  | $ | 18,439 |  | $ | 15,432 |  | $ | 3,007 |  | 19.5 | %

​

Depreciation and amortization expenses increased $3.0 million, or 19.5%, to $18.4 million for the nine months ended September 30, 2025 compared to $15.4 million for the same period in 2024. The increase was primarily due to the impact of infrastructure and technology purchases and other capitalized costs to support our growth.

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Change in Fair Value of Acquisition Contingent Earn-outs

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | ​ | 2025 | ​ | ​ | 2024 |  | Period-Over-Period Change
Change in fair value of acquisition contingent earn-outs | ​ | $ | (16,400) | ​ | $ | — |  | $ | (16,400) |  | *
* Percentage change not meaningful. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

​

Change in fair value of acquisition contingent earn-outs was $(16.4) million for the nine months ended September 30, 2025 due entirely to adjustments to the fair values of our ecosio acquisition contingent Cash Earn-outs and Stock Earn-outs of $8.6 million and $(25.0) million, respectively. For further information, refer to Note 4, “Financial Instruments and Fair Value Measurements” to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

Other Operating Expense (Income), Net

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ |
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change | ​
Other operating expense (income), net |  | $ | 10,109 |  | $ | (442) |  | $ | 10,551 |  | 2,387.1 | %

​

​

Other operating expense (income), net was $10.1 million of other operating expense, net for the nine months ended September 30, 2025 compared to $0.4 million of other operating income, net for the same period in 2024. This change was primarily driven by $8.1 million related to legal costs associated with a pending legal claim and $1.5 million in foreign currency transaction losses incurred. For further information regarding the referenced pending legal claim, refer to Note 12, “Commitments and Contingencies” to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

Interest Income, Net

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ |
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change | ​
Interest income, net |  | $ | (4,012) |  | $ | (2,471) |  | $ | (1,541) |  | 62.4 | %

​

​

Interest income, net was $4.0 million for the nine months ended September 30, 2025, compared to $2.5 million for the same period in 2024. This change was mainly due to several factors: (i) a $1.3 million increase in interest income primarily due to increased dollars invested during the period, (ii) a reduction of $0.4 million of interest expense related to the valuation of our prior year foreign currency forward contracts due to market fluctuations, and (iii) a $0.9 million decrease in interest costs related to the repayment of our Term Loan, which was fully repaid in the second quarter of 2024. These interest income increases were partially offset by $0.7 million in interest expense and a $0.4 million increase in deferred financing costs related to our Notes (as defined below).

​

Income Tax Benefit

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ |
(Dollars in thousands) |  | 2025 |  | 2024 |  | Year-Over-Year Change | ​
Income tax benefit |  | $ | (5,260) |  | $ | (1,722) |  | $ | (3,538) |  | 205.5 | %

​

Income tax benefit was $5.3 million and $1.7 million for the nine months ended September 30, 2025 and 2024, respectively. The change in tax benefit was primarily driven by higher tax benefits on exercises and vesting of stock awards recognized during the nine months ended September 30, 2025, as well as fluctuations in nondeductible contingent consideration liabilities and lower taxes in profitable jurisdictions. These income tax benefit increases were partially offset by fluctuations in valuation allowances on net deferred tax assets established for U.S. and certain foreign jurisdictions and increased limitations on deductions of certain employees’ compensation.

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Liquidity and Capital Resources

As of September 30, 2025, we had unrestricted cash and cash equivalents of $313.5 million. Our primary sources of capital include sales of our solutions, proceeds from bank lending facilities, and the offering of existing or future classes of stock.

​

As of September 30, 2025, we had a credit agreement with a banking syndicate (the “Credit Agreement”) that provides a $300.0 million revolving facility (the “Line of Credit”). There were no outstanding borrowings under the Credit Agreement at September 30, 2025.

​

On April 26, 2024, we closed a private offering of $345.0 million aggregate principal amount of 0.750% Convertible Senior Notes due in 2029 (the “Notes”). The net proceeds from the offering of the Notes were $333.7 million, after deducting the initial purchasers’ discount and commissions, and other transaction and offering expenses. For further information on the Notes, refer to our 2024 Annual Report.

​

We believe that our existing cash resources and our Line of Credit will be sufficient to meet our capital requirements and fund our operations for the next 12 months as well as our longer-term liquidity needs. If an early conversion notice occurs on our Notes, we have the option to pay cash, shares of our Class A common stock, or a combination of both. Also, we expect to have access to additional sources of funds in the capital markets, and we may, from time to time, seek additional capital through a combination of additional debt and/or equity financings. If we were to raise additional funds by issuing equity securities, our stockholders may experience dilution. Debt financing, if available, may involve covenants restricting our operations or our ability to incur additional debt. Any debt financing or additional equity that we raise may contain terms that are not favorable to us or our stockholders. Additional financing may not be available at all, or in amounts or on terms unacceptable to us.

​

​

The following table presents a summary of our cash flows for the periods indicated:

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | For the nine months ended | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | September 30, | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | 2025 | ​ | 2024 | ​ | Year-Over-Year Change | ​
Net cash provided by operating activities | $ | 123,275 | ​ | $ | 123,688 | ​ | $ | (413) |  | (0.3) | % | ​
Net cash used in investing activities | ​ | (91,577) | ​ | ​ | (133,268) | ​ | ​ | 41,691 | ​ | 31.3 | % | ​
Net cash provided by (used in) financing activities | ​ | (22,242) | ​ | ​ | 225,005 | ​ | ​ | (247,247) | ​ | 109.9 | % | ​
Effect of foreign exchange rate changes | ​ | 3,271 | ​ | ​ | 810 | ​ | ​ | 2,461 | ​ | (303.8) | % | ​
Net increase in cash, cash equivalents and restricted cash | $ | 12,727 | ​ | $ | 216,235 | ​ | $ | (203,508) | ​ | ​ | ​ | ​

​

Operating Activities. Net cash provided by operating activities of $123.3 million for the nine months ended September 30, 2025 consisted of net income of $14.2 million, adjusted for non-cash charges of $104.6 million, and cash inflows of $4.6 million related to changes in operating assets and liabilities, which were partially offset by $0.2 million in payments for purchase commitment and contingent consideration liabilities in excess of their initial fair value. The change in operating assets and liabilities was primarily driven by a decrease in accounts receivable due to the timing of cash collections during the period. This change was partially offset by an increase in prepaid expenses and other current assets, a decrease in accrued and deferred compensation and a decrease in deferred revenue.

​

Net cash provided by operating activities of $123.7 million for the nine months ended September 30, 2024 consisted of net income of $15.1 million, adjusted for non-cash charges of $93.5 million, and cash inflows of $19.5 million from changes in operating assets and liabilities, which were partially offset by $4.4 million in payments for purchase commitment and contingent consideration liabilities in excess of their initial fair value. The change in operating assets and liabilities was primarily driven by a decrease in accounts receivable and an increase in deferred revenue, primarily due to cash collections and customer growth during the period. These changes were partially offset by an increase in prepaid expenses and other current assets. These movements were primarily due to the timing of cash payments.

​

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Investing Activities. Net cash used in investing activities of $91.6 million for the nine months ended September 30, 2025 consisted of investments in property and equipment, and capitalized software of $69.3 million and $16.4 million, respectively, related to investments in infrastructure, new products, and enhancements to existing products. During the second quarter of 2025, we invested $15.0 million in the Kintsugi Investment. Additionally, we invested $2.4 million in available-for-sale investment securities, which was more than offset by proceeds of $11.6 million received during the period for sales and maturities in our investment securities. For further information on the Kintsugi Investment, refer to Note 3, “Investments” to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

Net cash used in investing activities of $133.3 million for the nine months ended September 30, 2024 consisted of investments in property and equipment, and capitalized software of $47.5 million and $16.4 million, respectively, related to investments in infrastructure, new products, and enhancements to existing products. Additionally, we paid $71.8 million related to acquisitions completed during the second and third quarters of 2024. Finally, we invested $12.2 million in available-for-sale investment securities, which was more than offset by proceeds of $14.6 million received during the period for sales and maturities in our investment securities.

​

Financing Activities. Net cash used in financing activities of $22.2 million for the nine months ended September 30, 2025 consisted of $27.2 million in payments for taxes related to the net share settlement of stock-based awards as well as a $4.5 million decrease in customer funds obligations, primarily due to timing differences between receipt of funds from customers and taxing jurisdiction withdrawals of these funds, partly offset by $7.7 million in proceeds from the exercise of stock options and $1.8 million in proceeds from the purchase of stock under our employee stock purchase plan (“ESPP”).

​

Net cash provided by financing activities of $225.0 million for the nine months ended September 30, 2024 consisted of $345.0 million in gross proceeds from our Notes, a $6.0 million increase in customer funds obligations, primarily due to timing differences between receipt of funds from customers and taxing jurisdiction withdrawals of these funds, and $1.4 million in proceeds from the purchase of stock under our ESPP. These transactions were partly offset by $46.9 million for the repayment of our Term Loan, $42.4 million for the purchase of the Capped Call Transactions, $3.9 million in payments of third-party debt, $20.0 million in payments for taxes related to the net share settlement of stock-based awards, $11.4 million for payments related to deferred financing costs and $7.6 million for payments on purchase commitment and contingent consideration liabilities.

​

Debt. As of September 30, 2025, we had a $300.0 million Line of Credit with no outstanding borrowings in connection with our Credit Agreement. As of September 30, 2025, we had $345.0 million aggregate principal amount of debt outstanding related to our Notes. For further information on our debt obligations, refer to Note 8, “Debt” to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

Funds Held for Customers and Customer Funds Obligations

We maintain trust accounts with financial institutions, which allow our customers to outsource their tax remittance functions to us. We have legal ownership over the accounts utilized for this purpose. Funds held for customers represent cash and cash equivalents that, based upon our intent, are restricted solely for satisfying the obligations to remit funds relating to our tax remittance services. Funds held for customers are not commingled with our operating funds.

Customer funds obligations represent our contractual obligations to remit collected funds to satisfy customer tax payments. Customer funds obligations are included as a current liability on our consolidated balance sheets as the obligations are expected to be settled within one year. Cash flows related to changes in customer funds obligations liability are presented as cash flows from financing activities.

Contractual Obligations and Commitments

As of September 30, 2025, we have no outstanding borrowings under our Line of Credit. Our Notes are due in May 2029. We expect to continue to fund debt maturities and interest payments with cash flows generated from operations, existing cash and cash equivalents, or proceeds from additional financing. For further information on our debt obligations, refer to Note 8, “Debt” to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

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There have been no material updates or changes to our contractual obligations and commitments compared to contractual obligations and commitments described in our 2024 Annual Report.

​

Key Business Metrics

We regularly review the metrics identified below to evaluate growth trends, measure our performance, formulate financial projections and make strategic decisions.

Annual Recurring Revenue (“ARR”) and Average Annual Revenue Per Customer (“AARPC”).

We derive the vast majority of our revenue from recurring software subscriptions. We believe ARR provides us with visibility to our projected software subscription revenue in order to evaluate the health of our business. Because we recognize subscription revenue ratably, we believe investors can use ARR to measure our expansion of existing customer revenues, new customer activity, and as an indicator of future software subscription revenues. ARR is based on monthly recurring revenue (“MRR”) from software subscriptions for the most recent month at period end, multiplied by twelve. MRR is calculated by dividing the software subscription price, inclusive of discounts, by the number of subscription covered months. MRR only includes customers with MRR at the end of the last month of the measurement period.

AARPC represents average annual revenue per customer and is calculated by dividing ARR by the number of software subscription customers at the end of the respective period.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, | ​ | ​ | ​
(Dollars in millions) |  | 2025 |  | 2024 |  | Year-Over-Year Change | ​
Annual Recurring Revenue | ​ | $ | 648.2 | ​ | $ | 576.8 | ​ | $ | 71.4 |  | 12.4 | %

​

ARR increased by $71.4 million, or 12.4%, at September 30, 2025, as compared to September 30, 2024. The increase was primarily driven by $37.1 million of growth in revenues from existing customers through their expanded use of our solutions as well as price increases, and $34.3 million in growth of subscriptions of our solutions to new customers.

We had 4,856 direct customers and AARPC was approximately $133,484 at September 30, 2025. At September 30, 2024, we had 4,855 direct customers and approximately $118,800 of AARPC. The increase in AARPC was primarily due to expansion of usage by existing customers and adding new customers through organic growth.

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Net Revenue Retention Rate (“NRR”).

We believe that our NRR provides insight into our ability to retain and grow revenue from our customers, as well as their potential long-term value to us. We also believe it demonstrates to investors our ability to expand existing customer revenues, which is one of our key growth strategies. Our NRR refers to the ARR expansion during the 12 months of a reporting period for all customers who were part of our customer base at the beginning of the reporting period. Our NRR calculation takes into account any revenue lost from departing customers or those who have downgraded or reduced usage, as well as any revenue expansion from migrations, new licenses for additional products or contractual and usage-based price changes.

​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, | ​
​ |  | 2025 |  | 2024 | ​
Net Revenue Retention Rate |  | 107 | % | 111 | %

​

​

NRR decreased by 4.0%, at September 30, 2025, as compared to September 30, 2024. The decrease was largely due to lower growth of additional entitlements as our customers’ annual growth has slowed, keeping them within current bands of usage, as well as delayed deal activity seen for some of our large multinational customers due to the macroeconomic environment.

​

Gross Revenue Retention Rate (“GRR”).

​

We believe our GRR provides insight into and demonstrates to investors our ability to retain revenues from our existing customers. Our GRR refers to how much of our MRR we retain each month after reduction for the effects of revenues lost from departing customers or those who have downgraded or reduced usage. GRR does not take into account revenue expansion from migrations, new licenses for additional products or contractual and usage-based price changes. GRR does not include revenue reductions resulting from cancellations of customer subscriptions that are replaced by new subscriptions associated with customer migrations to a newer version of the related software solution.

​

​

​

​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, | ​
​ |  | 2025 |  | 2024 | ​
Gross Revenue Retention Rate |  | 95 | % | 95 | %

​

Adjusted EBITDA and Adjusted EBITDA Margin.

We believe that Adjusted EBITDA is a measure widely used by securities analysts and investors to evaluate the financial performance of our company and other companies. We believe that Adjusted EBITDA and Adjusted EBITDA margin are useful as supplemental measures to evaluate our overall operating performance as they measure business performance focusing on cash related charges and because they are important metrics to lenders under our Credit Agreement. We define Adjusted EBITDA as net loss or income before interest (including adjustments to the settlement value of deferred purchase commitment liabilities), taxes, depreciation, and amortization, as adjusted to exclude charges for stock-based compensation expense, amortization of cloud computing arrangement implementation costs, severance expense, acquisition contingent consideration, changes in the fair value of acquisition contingent earn-outs, changes in the settlement value of deferred purchase commitment liabilities recorded as interest expense, and transaction costs. Adjusted EBITDA margin represents Adjusted EBITDA divided by total revenues for the same period. For purposes of comparison, our net income was $4.0 million and $7.2 million for the three months ended September 30, 2025 and 2024, respectively, while our net income margin was 2.1% and 4.2% over the same periods, respectively. Additionally, our net income was

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$14.2 million and $15.1 million for the nine months ended September 30, 2025 and 2024, respectively, while our net income margin was 2.6% and 3.1% over the same periods, respectively.

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | For the nine months ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
(Dollars in thousands) |  | 2025 |  | 2024 | ​ | 2025 |  | 2024 | ​
​ | ​ | ​ | (unaudited) | ​ | ​ | (unaudited) | ​
Adjusted EBITDA: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 4,045 | ​ | $ | 7,221 | ​ | $ | 14,214 | ​ | $ | 15,069 | ​
Interest income, net | ​ |  | (1,245) | ​ |  | (2,938) | ​ |  | (4,012) | ​ | ​ | (2,471) | ​
Income tax expense (benefit) | ​ |  | 1,520 | ​ |  | 613 | ​ |  | (5,260) | ​ | ​ | (1,722) | ​
Depreciation and amortization – property and equipment | ​ |  | 6,372 | ​ |  | 5,214 | ​ |  | 18,439 | ​ | ​ | 15,432 | ​
Depreciation and amortization of capitalized software and acquired intangible assets – cost of subscription revenues | ​ |  | 18,143 | ​ |  | 14,198 | ​ |  | 50,668 | ​ | ​ | 44,123 | ​
Amortization of acquired intangible assets – selling and marketing expense | ​ | ​ | 588 | ​ | ​ | 706 | ​ | ​ | 1,690 | ​ | ​ | 1,893 | ​
Amortization of cloud computing implementation costs – general and administrative expense | ​ | ​ | 871 | ​ | ​ | 1,005 | ​ | ​ | 2,895 | ​ | ​ | 2,994 | ​
Stock-based compensation expense | ​ |  | 13,215 | ​ |  | 10,134 | ​ |  | 46,249 | ​ | ​ | 36,459 | ​
Severance expense | ​ | ​ | 1,199 | ​ | ​ | 927 | ​ | ​ | 1,973 | ​ | ​ | 2,388 | ​
Acquisition contingent consideration | ​ | ​ | - | ​ | ​ | 100 | ​ | ​ | 200 | ​ | ​ | (2,275) | ​
Change in fair value of acquisition contingent earn-outs | ​ | ​ | (4,000) | ​ | ​ | — | ​ | ​ | (16,400) | ​ | ​ | — | ​
Transaction costs (1) | ​ |  | 2,785 | ​ |  | 1,443 | ​ |  | 8,425 | ​ | ​ | 1,991 | ​
Adjusted EBITDA | ​ | $ | 43,493 | ​ | $ | 38,623 | ​ | $ | 119,081 | ​ | $ | 113,881 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Adjusted EBITDA Margin: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Total revenues | ​ | $ | 192,112 | ​ | $ | 170,435 | ​ | $ | 553,733 | ​ | $ | 488,320 | ​
Adjusted EBITDA margin | ​ |  | 22.6 | % |  | 22.7 | % |  | 21.5 | % |  | 23.3 | %
(1) The current year periods include legal expenses associated with pending litigation related to claims we have made against a competitor. For further information, refer to Note 12, “Commitments and Contingencies” to our condensed consolidated financial statements.

​

The increase in Adjusted EBITDA for the three months ended September 30, 2025 of $4.9 million over the comparable period in 2024 was primarily driven by a $15.8 million increase in non-GAAP gross profit, which was partially offset by increases of $5.0 million in non-GAAP selling and marketing expense, $3.9 million in non-GAAP research and development expense, and $2.6 million in non-GAAP general and administrative expense. Adjusted EBITDA margin decreased to 22.6% for the three months ended September 30, 2025 compared to 22.7% for the comparable period in 2024, primarily due to strategic investments into information technology infrastructure, business and re-engineering processes and other continuing initiatives related to our 2024 acquisitions.

​

The increase in Adjusted EBITDA for the nine months ended September 30, 2025 of $5.2 million over the comparable period in 2024 was primarily driven by a $56.2 million increase in non-GAAP gross profit, which was partially offset by increases of $19.1 million in non-GAAP general and administrative expense, $18.7 million in non-GAAP selling and marketing expense, and $12.3 million in non-GAAP research and development expense. Adjusted EBITDA margin decreased to 21.5% for the nine months ended September 30, 2025 compared to 23.3% for the comparable period in 2024, primarily due to strategic investments into information technology infrastructure, business and re-engineering processes and other continuing initiatives related to our 2024 acquisitions.

​

Free Cash Flow and Free Cash Flow Margin.

​

We use free cash flow as a critical measure in the evaluation of liquidity in conjunction with related GAAP amounts. We also use this measure when considering available cash, including for decision-making purposes related to dividends and discretionary investments. We consider free cash flow to be an important measure for investors because it measures the amount of cash we generate from our operations after our capital expenditures and capitalization of software

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development costs. In addition, we base certain of our forward-looking estimates and budgets on free cash flow and free cash flow margin. We define free cash flow as the total of net cash provided by operating activities less purchases of property and equipment and capitalized software. We define free cash flow margin as free cash flow divided by total revenues for the same period.

Our net cash provided by operating activities was $62.5 million and $41.4 million for the three months ended September 30, 2025 and 2024, respectively, while our operating cash flow margin was 32.5% and 24.3% over the same periods, respectively. Our net cash provided by operating activities was $123.3 million and $123.7 million for the nine months ended September 30, 2025 and 2024, respectively, while our operating cash flow margin was 22.3% and 25.3% over the same periods, respectively.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | For the nine months ended | ​
​ | ​ | September 30, | ​ | ​ | September 30, | ​
(Dollars in thousands) |  | 2025 |  | ​ | 2024 | ​ | ​ | 2025 |  | 2024 | ​
​ | ​ | ​ | (unaudited) | ​ | ​ | ​ | (unaudited) | ​
Free Cash Flow: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash provided by operating activities | ​ | $ | 62,467 | ​ | ​ | $ | 41,396 | ​ | ​ | $ | 123,275 | ​ | $ | 123,688 | ​
Property and equipment additions | ​ | ​ | (26,436) | ​ | ​ | ​ | (17,771) | ​ | ​ | ​ | (69,342) | ​ | ​ | (47,520) | ​
Capitalized software additions | ​ | ​ | (5,879) | ​ | ​ | ​ | (5,260) | ​ | ​ | ​ | (16,444) | ​ | ​ | (16,357) | ​
Free cash flow | ​ | $ | 30,152 | ​ | ​ | $ | 18,365 | ​ | ​ | $ | 37,489 | ​ | $ | 59,811 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Free Cash Flow Margin: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total revenues | ​ | $ | 192,112 | ​ | ​ | $ | 170,435 | ​ | ​ | $ | 553,733 | ​ | $ | 488,320 | ​
Free cash flow margin | ​ |  | 15.7 | % | ​ | ​ | 10.8 | % | ​ |  | 6.8 | % |  | 12.2 | %

​

Free cash flow increased by $11.8 million for the three months ended September 30, 2025 as compared to the same period in 2024. This increase was primarily driven by an increase in net cash provided by operating activities of $21.1 million, primarily attributable to the timing of cash collections and payments during the period, which was partially offset by $9.3 million in additional investments in property and equipment, and capitalized software related to investments in infrastructure, new products, and enhancements to existing products. Free cash flow margin increased to 15.7% for the three months ended September 30, 2025 compared to 10.8% for the same period in 2024.

Free cash flow decreased by $22.3 million for the nine months ended September 30, 2025 as compared to the same period in 2024. This decrease was primarily driven by $21.9 million in additional investments in property and equipment, and capitalized software related to investments in infrastructure, new products, and enhancements to existing products. Free cash flow margin decreased to 6.8% for the nine months ended September 30, 2025 compared to 12.2% for the same period in 2024.

Use and Reconciliation of Non-GAAP Financial Measures

In addition to our results determined in accordance with GAAP, we have calculated Adjusted EBITDA, Adjusted EBITDA margin, free cash flow, free cash flow margin, non-GAAP cost of revenues, non-GAAP gross profit, non-GAAP gross margin, non-GAAP research and development expense, non-GAAP selling and marketing expense, non-GAAP general and administrative expense, non-GAAP operating income, and non-GAAP net income, which are each non-GAAP financial measures. We have provided tabular reconciliations of each of these non-GAAP financial measures to its most directly comparable GAAP financial measure.

We use these non-GAAP financial measures to understand and compare operating results across accounting periods, for internal budgeting and forecasting purposes, and to evaluate financial performance. We use non-GAAP financial measures of free cash flow and free cash flow margin to evaluate liquidity. Our non-GAAP financial measures are presented as supplemental disclosure as we believe they provide useful information to investors and others in understanding and evaluating our results, prospects, and liquidity period-over-period without the impact of certain items that do not directly correlate to our operating performance and that may vary significantly from period to period for reasons

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unrelated to our operating performance, as well as comparing our financial results to those of other companies. Our definitions of these non-GAAP financial measures may differ from similarly titled measures presented by other companies, and therefore, comparability may be limited. In addition, other companies may not publish these or similar metrics. Thus, our non-GAAP financial measures should be considered in addition to, not as a substitute for, or in isolation from, the financial information prepared in accordance with GAAP financial measures, and should be read in conjunction with the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

Additional Non-GAAP Financial Measures

In addition to Adjusted EBITDA, Adjusted EBITDA margin, free cash flow, and free cash flow margin calculated and discussed in “Key Business Metrics,” the following additional non-GAAP financial measures are calculated and presented further below:

| ● | Non-GAAP cost of revenues, software subscriptions is determined by adding back to GAAP cost of revenues, software subscriptions, the stock-based compensation expense, and depreciation and amortization of capitalized software and acquired intangible assets included in cost of subscription revenues for the respective periods.

| ● | Non-GAAP cost of revenues, services is determined by adding back to GAAP cost of revenues, services, the stock-based compensation expense included in cost of revenues, services for the respective periods.

| ● | Non-GAAP gross profit is determined by adding back to GAAP gross profit the stock-based compensation expense, and depreciation and amortization of capitalized software and acquired intangible assets included in cost of subscription revenues for the respective periods.

| ● | Non-GAAP gross margin is determined by dividing non-GAAP gross profit by total revenues for the respective periods.

| ● | Non-GAAP research and development expense is determined by adding back to GAAP research and development expense the stock-based compensation expense and transaction costs related to acquired technology included in research and development expense for the respective periods.

| ● | Non-GAAP selling and marketing expense is determined by adding back to GAAP selling and marketing expense the stock-based compensation expense and the amortization of acquired intangible assets included in selling and marketing expense for the respective periods.

| ● | Non-GAAP general and administrative expense is determined by adding back to GAAP general and administrative expense the stock-based compensation expense, amortization of cloud computing implementation costs and severance expense included in general and administrative expense for the respective periods.

| ● | Non-GAAP operating income is determined by adding back to GAAP loss or income from operations the stock-based compensation expense, depreciation and amortization of capitalized software and acquired intangible assets included in cost of subscription revenues, amortization of acquired intangible assets included in selling and marketing expense, amortization of cloud computing implementation costs in general and administrative expense, severance expense, acquisition contingent consideration, changes in the fair value of acquisition contingent earn-outs, and transaction costs, included in GAAP loss or income from operations for the respective periods.

| ● | Non-GAAP net income is determined by adding back to GAAP net income or loss income tax benefit or expense, stock-based compensation expense, depreciation and amortization of capitalized software and acquired intangible assets included in cost of subscription revenues, amortization of acquired intangible assets included in selling and marketing expense, amortization of cloud computing implementation costs in general and administrative expense, severance expense, acquisition contingent consideration, adjustments to

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|  | the settlement value of deferred purchase commitment liabilities recorded as interest expense, changes in the fair value of acquisition contingent earn-outs, and transaction costs, included in GAAP net income or loss for the respective periods to determine non-GAAP income or loss before income taxes. Non-GAAP income or loss before income taxes is then adjusted for income taxes calculated using the respective statutory tax rates for applicable jurisdictions, which for purposes of this determination were assumed to be 25.5%.

We encourage investors and others to review our financial information in its entirety, not to rely on any single financial measure and to view these non-GAAP financial measures in conjunction with the related GAAP financial measures.

​

The following schedules reflect our additional non-GAAP financial measures and reconciles our additional non-GAAP financial measures to the related GAAP financial measures.

​

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | For the nine months ended |
​ | ​ | September 30, | ​ | September 30, |
​ | ​ | 2025 | ​ | 2024 | ​ | 2025 | ​ | 2024 |
(Dollars in thousands) | ​ | (unaudited) | ​ | (unaudited) | ​
Non-GAAP cost of revenues, software subscriptions |  | $ | 30,673 | ​ | $ | 28,549 | ​ | $ | 83,392 |  | $ | 83,470 | ​
Non-GAAP cost of revenues, services | ​ | $ | 19,421 | ​ | $ | 15,712 | ​ | $ | 55,424 | ​ | $ | 46,157 | ​
Non-GAAP gross profit | ​ | $ | 142,018 | ​ | $ | 126,174 | ​ | $ | 414,917 | ​ | $ | 358,693 | ​
Non-GAAP gross margin | ​ |  | 73.9 | % | ​ | 74.0 | % |  | 74.9 | % |  | 73.5 | %
Non-GAAP research and development expense | ​ | $ | 16,766 | ​ | $ | 12,897 | ​ | $ | 51,370 | ​ | $ | 39,061 | ​
Non-GAAP selling and marketing expense | ​ | $ | 43,406 | ​ | $ | 38,454 | ​ | $ | 129,872 | ​ | $ | 111,149 | ​
Non-GAAP general and administrative expense | ​ | $ | 38,437 | ​ | $ | 35,837 | ​ | $ | 113,110 | ​ | $ | 94,037 | ​
Non-GAAP operating income | ​ | $ | 37,121 | ​ | $ | 33,409 | ​ | $ | 100,642 | ​ | $ | 98,449 | ​
Non-GAAP net income | ​ | $ | 28,582 | ​ | $ | 27,079 | ​ | $ | 77,967 | ​ | $ | 75,501 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

​

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | For the three months ended |  | For the nine months ended | ​
​ | September 30, |  | September 30, | ​
​ | 2025 | ​ | 2024 |  | 2025 | ​ | 2024 | ​
(Dollars in thousands) | (unaudited) | ​ | (unaudited) | ​
Non-GAAP Cost of Revenues, Software Subscriptions: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​
Cost of revenues, software subscriptions | $ | 50,034 | ​ | $ | 43,641 | ​ | $ | 138,738 | ​ | $ | 131,030 | ​
Stock-based compensation expense |  | (1,218) | ​ |  | (894) | ​ |  | (4,678) | ​ | ​ | (3,437) | ​
Depreciation and amortization of capitalized software and acquired intangible assets – cost of subscription revenues |  | (18,143) | ​ |  | (14,198) | ​ |  | (50,668) | ​ |  | (44,123) | ​
Non-GAAP cost of revenues, software subscriptions | $ | 30,673 | ​ | $ | 28,549 | ​ | $ | 83,392 | ​ | $ | 83,470 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-GAAP Cost of Revenues, Services: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cost of revenues, services | $ | 20,762 | ​ | $ | 16,270 | ​ | $ | 59,485 | ​ | $ | 48,286 | ​
Stock-based compensation expense |  | (1,341) | ​ |  | (558) | ​ |  | (4,061) | ​ |  | (2,129) | ​
Non-GAAP cost of revenues, services | $ | 19,421 | ​ | $ | 15,712 | ​ | $ | 55,424 | ​ | $ | 46,157 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-GAAP Gross Profit: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Gross profit | $ | 121,316 | ​ | $ | 110,524 | ​ | $ | 355,510 | ​ | $ | 309,004 | ​
Stock-based compensation expense |  | 2,559 | ​ |  | 1,452 | ​ |  | 8,739 | ​ |  | 5,566 | ​
Depreciation and amortization of capitalized software and acquired intangible assets – cost of subscription revenues |  | 18,143 | ​ |  | 14,198 | ​ |  | 50,668 | ​ |  | 44,123 | ​
Non-GAAP gross profit | $ | 142,018 | ​ | $ | 126,174 | ​ | $ | 414,917 | ​ | $ | 358,693 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-GAAP Gross Margin: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Total revenues | $ | 192,112 | ​ | $ | 170,435 | ​ | $ | 553,733 | ​ | $ | 488,320 | ​
Non-GAAP gross margin |  | 73.9 | % |  | 74.0 | % |  | 74.9 | % |  | 73.5 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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​ | For the three months ended | ​ | For the nine months ended
​ | September 30, | ​ | September 30, | ​
​ | 2025 | ​ | 2024 | ​ | ​ | 2025 | ​ | 2024 | ​
(Dollars in thousands) | (unaudited) | ​ | (unaudited) | ​
Non-GAAP Research and Development Expense: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Research and development expense | $ | 19,929 | ​ | $ | 15,621 | ​ | $ | 61,397 | ​ | $ | 47,080 | ​
Stock-based compensation expense |  | (3,163) | ​ |  | (2,001) | ​ |  | (10,027) | ​ |  | (7,296) | ​
Transaction costs | ​ | — | ​ | ​ | (723) | ​ | ​ | — | ​ | ​ | (723) | ​
Non-GAAP research and development expense | $ | 16,766 | ​ | $ | 12,897 | ​ | $ | 51,370 | ​ | $ | 39,061 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-GAAP Selling and Marketing Expense: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Selling and marketing expense | $ | 47,385 | ​ | $ | 42,111 | ​ | $ | 143,994 | ​ | $ | 123,143 | ​
Stock-based compensation expense | ​ | (3,391) | ​ |  | (2,951) | ​ | ​ | (12,432) | ​ |  | (10,101) | ​
Amortization of acquired intangible assets – selling and marketing expense |  | (588) | ​ |  | (706) | ​ |  | (1,690) | ​ |  | (1,893) | ​
Non-GAAP selling and marketing expense | $ | 43,406 | ​ | $ | 38,454 | ​ | $ | 129,872 | ​ | $ | 111,149 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-GAAP General and Administrative Expense: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
General and administrative expense | $ | 44,609 | ​ | $ | 41,499 | ​ | $ | 133,029 | ​ | $ | 112,915 | ​
Stock-based compensation expense |  | (4,102) | ​ |  | (3,730) | ​ |  | (15,051) | ​ |  | (13,496) | ​
Severance expense | ​ | (1,199) | ​ | ​ | (927) | ​ | ​ | (1,973) | ​ | ​ | (2,388) | ​
Amortization of cloud computing implementation costs – general and administrative expense | ​ | (871) | ​ | ​ | (1,005) | ​ | ​ | (2,895) | ​ | ​ | (2,994) | ​
Non-GAAP general and administrative expense | $ | 38,437 | ​ | $ | 35,837 | ​ | $ | 113,110 | ​ | $ | 94,037 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-GAAP Operating Income: |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Income from operations | $ | 4,320 | ​ | $ | 4,896 | ​ | $ | 4,942 | ​ | $ | 10,876 | ​
Stock-based compensation expense |  | 13,215 | ​ |  | 10,134 | ​ |  | 46,249 | ​ |  | 36,459 | ​
Depreciation and amortization of capitalized software and acquired intangible assets – cost of subscription revenues |  | 18,143 | ​ |  | 14,198 | ​ |  | 50,668 | ​ |  | 44,123 | ​
Amortization of acquired intangible assets – selling and marketing expense | ​ | 588 | ​ |  | 706 | ​ | ​ | 1,690 | ​ |  | 1,893 | ​
Amortization of cloud computing implementation costs – general and administrative expense | ​ | 871 | ​ | ​ | 1,005 | ​ | ​ | 2,895 | ​ | ​ | 2,994 | ​
Severance expense | ​ | 1,199 | ​ | ​ | 927 | ​ | ​ | 1,973 | ​ | ​ | 2,388 | ​
Acquisition contingent consideration | ​ | — | ​ | ​ | 100 | ​ | ​ | 200 | ​ | ​ | (2,275) | ​
Change in fair value of acquisition contingent earn-outs | ​ | (4,000) | ​ | ​ | — | ​ | ​ | (16,400) | ​ | ​ | — | ​
Transaction costs (1) | ​ | 2,785 | ​ |  | 1,443 | ​ |  | 8,425 | ​ | ​ | 1,991 | ​
Non-GAAP operating income | $ | 37,121 | ​ | $ | 33,409 | ​ | $ | 100,642 | ​ | $ | 98,449 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-GAAP Net Income: |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​ | ​
Net income | $ | 4,045 | ​ | $ | 7,221 | ​ | $ | 14,214 | ​ | $ | 15,069 | ​
Income tax expense (benefit) | ​ | 1,520 | ​ | ​ | 613 | ​ | ​ | (5,260) | ​ | ​ | (1,722) | ​
Stock-based compensation expense |  | 13,215 | ​ |  | 10,134 | ​ |  | 46,249 | ​ |  | 36,459 | ​
Depreciation and amortization of capitalized software and acquired intangible assets – cost of subscription revenues | ​ | 18,143 | ​ | ​ | 14,198 | ​ | ​ | 50,668 | ​ | ​ | 44,123 | ​
Amortization of acquired intangible assets – selling and marketing expense | ​ | 588 | ​ | ​ | 706 | ​ | ​ | 1,690 | ​ | ​ | 1,893 | ​
Amortization of cloud computing implementation costs – general and administrative expense | ​ | 871 | ​ | ​ | 1,005 | ​ | ​ | 2,895 | ​ | ​ | 2,994 | ​
Severance expense |  | 1,199 | ​ |  | 927 | ​ |  | 1,973 | ​ |  | 2,388 | ​
Acquisition contingent consideration | ​ | — | ​ | ​ | 100 | ​ | ​ | 200 | ​ | ​ | (2,275) | ​
Change in fair value of acquisition contingent earn-outs | ​ | (4,000) | ​ | ​ | — | ​ | ​ | (16,400) | ​ | ​ | — | ​
Transaction costs (1) | ​ | 2,785 | ​ | ​ | 1,443 | ​ | ​ | 8,425 | ​ | ​ | 1,991 | ​
Change in settlement value of deferred purchase commitment liability – interest expense | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 423 | ​
Non-GAAP income before income taxes | ​ | 38,366 | ​ |  | 36,347 | ​ | ​ | 104,654 | ​ |  | 101,343 | ​
Income tax adjustment at statutory rate (2) |  | (9,784) | ​ |  | (9,268) | ​ |  | (26,687) | ​ |  | (25,842) | ​
Non-GAAP net income | $ | 28,582 | ​ | $ | 27,079 | ​ | $ | 77,967 | ​ | $ | 75,501 | ​
(1) The current year periods include legal expenses associated with pending litigation related to claims we have made against a competitor. For further information, refer to Note 12, “Commitments and Contingencies” to our condensed consolidated financial statements. | ​
(2) Non-GAAP income before income taxes is adjusted for income taxes using the respective statutory tax rates for applicable jurisdictions, which for purposes of this determination were assumed to be 25.5%. | ​

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​

Critical Accounting Estimates

The critical accounting policies that reflect our more significant judgments and estimates used in the preparation of our condensed consolidated financial statements include revenue recognition and income taxes, which are described in our 2024 Annual Report. There have been no material updates or changes to our critical accounting estimates compared to the critical accounting estimates described in our 2024 Annual Report.

Recent Accounting Pronouncements

For further information on recent accounting pronouncements, refer to Note 1, “Summary of Significant Accounting Policies” to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

Item 3. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

We had unrestricted cash and cash equivalents of $313.5 million and $296.1 million as of September 30, 2025 and December 31, 2024, respectively, and investments of $9.2 million as of December 31, 2024. We maintain our cash and cash equivalents in deposit accounts and money market funds with various financial institutions. Due to the short-term nature of these instruments, we believe that we do not have any material exposure to changes in the fair value of these investments as a result of changes in interest rates. Increases or declines in interest rates would be expected to augment or reduce future interest income by an insignificant amount.

We are exposed to risk related to changes in interest rates on our outstanding borrowings. Borrowings under our Credit Agreement bear interest at rates that are variable. Increases in the bank prime or SOFR rates would increase the interest rate on any future outstanding borrowings. Any debt we incur in the future may also bear interest at variable rates.

​

Our Notes have a fixed annual interest rate; therefore, we have no financial or economic interest exposure associated with changes in interest rates. However, the fair value of fixed rate debt instruments fluctuates when interest rates change. Additionally, the fair value of the Notes can be affected when the market price of our common stock fluctuates. We carry the Notes at principal value less unamortized issuance costs on our condensed consolidated balance sheets, and we present fair value for required disclosure purposes only.

​

Foreign Currency Exchange Risk

Our revenues and expenses are primarily denominated in U.S. Dollars. For our foreign operations, the majority of our revenues and expenses are denominated in other currencies, such as the Canadian Dollar, Euro, British Pound, Swedish Krona, and Brazilian Real. Decreases in the relative value of the U.S. Dollar as compared to these currencies may negatively affect our revenues and other operating results as expressed in U.S. Dollars. For the three and nine months ended September 30, 2025, approximately 6% and 5%, respectively, of our revenues were denominated in currencies other than U.S. Dollars. For the three and nine months ended September 30, 2024, approximately 3% and 4%, respectively, of our revenues were denominated in currencies other than U.S. Dollars.

We have experienced and will continue to experience fluctuations in our net income or loss as a result of transaction gains or losses related to revaluing certain current asset and current liability balances that are denominated in currencies other than the functional currency of the entities in which they are recorded. We have historically recognized immaterial amounts of foreign currency gains and losses in each of the periods presented. We may in the future hedge selected significant transactions denominated in currencies other than the U.S. dollar as we expand our international operations and our risk grows.

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Item 4. | CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial officer, evaluated the effectiveness of our disclosure controls and procedures as defined in Rule 13a-15(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

Based on the evaluation of our disclosure controls and procedures, our principal executive officer and principal financial officer concluded that, as of September 30, 2025, our disclosure controls and procedures were effective at a reasonable assurance level.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during the period covered by this Quarterly Report on Form 10-Q that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

​

​

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PART II---OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

On January 25, 2022, we filed a complaint (subsequently amended on February 9, 2022) against Avalara, Inc. (“Avalara”) in the United States District Court for the Eastern District of Pennsylvania. The complaint alleges claims of unfair competition, intentional interference with contractual relations, and trade secret misappropriation against Avalara. We are seeking a permanent injunction to prevent Avalara from further interference with our contractual relations and to prohibit the disclosure in any way of our confidential, proprietary and/or trade secret information. We are also seeking monetary damages, including punitive damages and attorney’s fees. As of September 30, 2025, the matter remains before the Court and is proceeding through the discovery process. We believe the allegations in the complaint, once proven, are sufficient to prevail in this matter. However, the eventual outcome of the case is subject to a number of uncertainties, and therefore we cannot offer any assurance as to the ultimate impact of this case on our business and operations.

In addition to the foregoing matter, from time to time, we may be involved in various legal proceedings arising from the normal course of business activities. We are not presently a party to any litigation the outcome of which we believe, if determined adversely to us, would individually or taken together have a material adverse effect on our business, operating results, cash flows or financial condition.

ITEM 1A. RISK FACTORS

This document incorporates by reference various risk factors discussed in the Company’s 2024 Annual Report, under the heading “Risk Factors”. There are no material changes to the risk factors discussed in these filings. You should carefully consider these risks, together with management’s discussion and analysis of our financial condition and results of operations in conjunction with the condensed consolidated financial statements and the notes thereto included elsewhere in this Quarterly Report on Form 10-Q. If any of the events contemplated should occur, our business, results of operations, financial condition and cash flows could suffer significantly.

ITEM 2. | UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. | DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

ITEM 5. OTHER INFORMATION

During the three months ended September 30, 2025, no director or officer of the Company adopted, modified or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K.

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ITEM 6. EXHIBITS

​ |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Exhibit Number |  | Exhibit Description |  | Form |  | File No. |  | Exhibit |  | Filing Date |  | Filed Herewith |  | Furnished Herewith
31.1 | ​ | Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X | ​ | ​
31.2 |  | Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X | ​ | ​
32.1 |  | Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X
32.2 |  | Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X
101.INS |  | Inline XBRL Instance Document | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X | ​ |
101.SCH |  | Inline XBRL Taxonomy Extension Schema Document | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X | ​ | ​
101.CAL |  | Inline XBRL Taxonomy Extension Calculation Linkbase Document | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X | ​ | ​
101.DEF |  | Inline XBRL Taxonomy Extension Definition Linkbase Document | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X | ​ | ​
101.LAB |  | Inline XBRL Taxonomy Extension Label Linkbase Document | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X | ​ | ​
101.PRE |  | Inline XBRL Taxonomy Extension Presentation Linkbase Document | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | X | ​ | ​
104 | ​ | Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

​

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SIGNATURES

​

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

​

| ​ |  |
|  | Vertex, Inc.
| ​ |
Date: November 3, 2025 | ​ | By: | /s/ David DeStefano
| ​ |  | David DeStefano
| ​ |  | President, Chief Executive Officer and Chairperson (principal executive officer)
| ​ |
Date: November 3, 2025 | ​ | By: | /s/ John Schwab
| ​ |  | John Schwab
| ​ |  | Chief Financial Officer (principal financial officer)

​

​

​

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