Exhibit 99.1

Byline Bancorp, Inc. Reports Fourth Quarter and Full Year 2025 Financial Results

Fourth quarter net income of $34.5 million, $0.76 diluted earnings per share

Full year net income of $130.1 million, $2.89 diluted earnings per share

Chicago, IL, January 22, 2026 – Byline Bancorp, Inc. (NYSE: BY), today reported:

|  |  |  | At or for the quarter |  | Full Year Highlights (compared to prior year)
|  |  | 4Q25 |  | 3Q25 |  | 4Q24 |  |
Financial Results ($ in thousands) |  |  |  |  |  |  |  |  |  |  | • Delivered solid full year 2025 results
| Net interest income |  | $ | 101,255 |  | $ | 99,890 |  | $ | 88,524 |  | reflecting record revenues of $446.3 million
| Non-interest income |  |  | 15,750 |  |  | 15,845 |  |  | 16,149 |  |
| Total revenue(1) |  |  | 117,005 |  |  | 115,735 |  |  | 104,673 |  | • Net income increased 7.7% to $130.1 million
| Non-interest expense (NIE) |  |  | 60,369 |  |  | 60,518 |  |  | 57,431 |  |
| Pre-tax pre-provision net income (PTPP)(1) |  |  | 56,636 |  |  | 55,217 |  |  | 47,242 |  | • PTPP net income of $209.4 million(1), up 11.3%
| Provision for credit losses |  |  | 9,702 |  |  | 5,298 |  |  | 6,878 |  |
| Provision for income taxes |  |  | 12,413 |  |  | 12,719 |  |  | 10,044 |  | • Net interest income up $37.3 million,
| Net income |  | $ | 34,521 |  | $ | 37,200 |  | $ | 30,320 |  | or 10.7%; NIM up 25 bps to 4.22%
Per Share |  |  |  |  |  |  |  |  |  |  | • Generated full year positive operating leverage
| Diluted earnings per share (EPS) |  | $ | 0.76 |  | $ | 0.82 |  | $ | 0.69 |  |
| Dividends declared per common share |  |  | 0.10 |  |  | 0.10 |  |  | 0.09 |  | • TBV per common share of $23.44(1), up 16.7%
| Book value per common share |  |  | 27.84 |  |  | 26.99 |  |  | 24.55 |  |
| Tangible book value per common share(1) |  |  | 23.44 |  |  | 22.58 |  |  | 20.09 |  | Fourth Quarter Highlights (compared to prior quarter)
Balance Sheet & Credit Quality ($ in thousands) |  |  |  |  |  |  |  |  |  |  | • Net interest income of $101.3 million, an
| Total deposits |  | $ | 7,647,443 |  | $ | 7,828,197 |  | $ | 7,458,628 |  | increase of $1.4 million, or 1.4%
| Total loans and leases |  |  | 7,522,990 |  |  | 7,461,321 |  |  | 6,910,022 |  |
| Net charge-offs |  |  | 6,707 |  |  | 7,107 |  |  | 7,792 |  | • NIM expanded eight bps to 4.35%
| Allowance for credit losses (ACL) |  |  | 108,834 |  |  | 105,717 |  |  | 97,988 |  |
| ACL to total loans and leases held for investment |  |  | 1.45% |  |  | 1.42% |  |  | 1.42% |  | • PTPP ROAA of 2.32%(1), 13th consecutive
|  |  |  |  |  |  |  |  |  |  |  | quarter greater than 2.00%
Select Ratios (annualized where applicable) |  |  |  |  |  |  |  |  |  |  |
| Efficiency ratio(1) |  |  | 50.32% |  |  | 51.00% |  |  | 53.58% |  | • Efficiency ratio(1) of 50.32%
| Return on average assets (ROAA) |  |  | 1.41% |  |  | 1.52% |  |  | 1.31% |  |
| Return on average stockholders' equity |  |  | 10.61% |  |  | 12.21% |  |  | 11.03% |  | • TCE/TA of 11.29%(1), increase of 51 bps
| Return on average tangible common equity(1) |  |  | 12.97% |  |  | 15.11% |  |  | 13.92% |  |
| Net interest margin (NIM) |  |  | 4.35% |  |  | 4.27% |  |  | 4.01% |  | • CET 1 of 12.33%, up 18 bps
| Common equity to total assets |  |  | 13.14% |  |  | 12.61% |  |  | 11.49% |  |
| Tangible common equity to tangible assets(1) |  |  | 11.29% |  |  | 10.78% |  |  | 9.61% |  | • Repurchased 345,706 common shares
| Common equity tier 1 |  |  | 12.33% |  |  | 12.15% |  |  | 11.70% |  |

CEO/President Commentary
Roberto R. Herencia, Executive Chairman and CEO of Byline Bancorp, commented, "Throughout 2025 we advanced our strategy of becoming the preeminent commercial bank in Chicago and delivering strong financial results. We made significant progress across our strategic priorities—deepening our commercial presence, growing customers, and executing initiatives that strengthened our franchise. As we enter 2026, we are operating from a position of strength, remain focused on consistent execution of our strategy, supporting our customers, and driving long‑term value for our stockholders." Alberto J. Paracchini, President of Byline Bancorp, added, "Our fourth quarter performance reflected strong execution across our business units. We delivered solid earnings, maintained excellent profitability while strengthening our balance sheet. The quarter capped a year of meaningful progress, and we are well positioned to support our customers and drive profitable growth in 2026. I want to thank all our employees for their dedication, talent, and commitment, which remain central to our success."

(1)
Represents non-GAAP financial measures. See “Reconciliation of non-GAAP Financial Measures” for a reconciliation to the most directly comparable GAAP financial measure.

Byline Bancorp, Inc.

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Board Declares Cash Dividend of $0.12 per Share

On January 21, 2026, the Company's Board of Directors declared a cash dividend of $0.12 per share, which represents a 20.0% increase from the previous quarterly dividend of $0.10 per share. The dividend will be paid on February 17, 2026, to stockholders of record of the Company's common stock as of February 3, 2026.

STATEMENTS OF OPERATIONS HIGHLIGHTS

Net Interest Income

Quarterly results

Net interest income for the fourth quarter of 2025 was $101.3 million, an increase of $1.4 million, or 1.4%, from the third quarter of 2025. The increase in net interest income was due to lower rates paid on deposits and the redemption of the subordinated note issued during 2020 on October 1, 2025, offset by lower interest income on loans and leases and on securities.

Tax-equivalent net interest margin(1) for the fourth quarter of 2025 was 4.36%, an increase of eight basis points compared to the third quarter of 2025. The increase was primarily due to lower rates paid on deposits and lower costs of subordinated notes and debentures, offset by lower yields on loans and leases. Net loan accretion income contributed 10 basis points to the net interest margin for the quarter, a one basis point decrease over the prior quarter.

The average cost of total deposits was 1.97% for the fourth quarter of 2025, a decrease of 19 basis points compared to the third quarter of 2025, mainly as a result of a lower rates paid on money market accounts, and lower balances of, and rates paid on, brokered time deposits.

Full-year results

Net interest income for the year ended December 31, 2025 was $385.3 million, an increase of $37.3 million, or 10.7%, from the prior year. The increase in net interest income was primarily due to lower rates paid on deposits, and higher interest income reflecting growth in the loan and lease portfolio, offset by lower income on other interest and dividend income.

Tax-equivalent net interest margin(1) for the year ended December 31, 2025 was 4.23%, an increase of 25 basis points compared to the prior year. The increase was primarily a result of the changing interest rate environment, reflecting our lower reliance on brokered time deposits, offset by lower yields on loans and interest-bearing cash. Net loan accretion income contributed 11 basis points to the net interest margin for the year, a four basis point decrease over the prior year.

The average cost of total deposits was 2.17% for the year ended December 31, 2025, a decrease of 44 basis points compared to the prior year mainly as a result of lower balances and rates paid on time deposits.

Provision for Credit Losses

Quarterly results

The provision for credit losses was $9.7 million for the fourth quarter of 2025, an increase of $4.4 million compared to $5.3 million for the third quarter of 2025, mainly due to higher non-performing loans and leases.

Full-year result

The provision for credit losses was $36.1 million for the year ended December 31, 2025, an increase of $9.1 million compared to $27.0 million for the prior year, mainly due to growth in the loan and leases portfolio and higher non-performing loans and leases.

Non-interest Income

Quarterly results

Non-interest income for the fourth quarter of 2025 was $15.7 million, a slight decrease of $95,000 , or 0.6%, compared to $15.8 million for the third quarter of 2025. The modest decline in total non-interest income was primarily due to lower net gains on sales of loans, offset by higher other non-interest income and increases in the fair value of equity securities. Net gains on sales of loans totaled $5.4 million for the quarter, a decrease of $1.6 million, or 22.8%, compared to the prior quarter. This decrease was primarily due to lower premiums, mix and timing of loans sold. During the fourth quarter of 2025, we sold $78.9 million of U.S. government guaranteed loans compared to $92.9 million during the third quarter of 2025.

Full-year results

Non-interest income for the year ended December 31, 2025 was $60.9 million, an increase of $2.1 million, or 3.5%, compared to $58.9 million for the prior year. The increase in total non-interest income was primarily due to higher income on other non-interest income primarily driven by swap activity, and a lower downward revaluation on the loan servicing asset, offset by lower net gains on sales of loans. Net gains on sales of loans were $22.7 million for the current year, a decrease of $1.8 million, or 7.4% compared to the prior year,

(1) Represents non-GAAP financial measures. See “Reconciliation of non-GAAP Financial Measures” for a reconciliation of our non-GAAP measures to the most directly comparable GAAP financial measure.

Byline Bancorp, Inc.

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primarily due to lower premiums compared to the prior year. During 2025, we sold $315.0 million of U.S. government guaranteed loans compared to $314.8 million during the prior year.

Non-interest Expense

Quarterly results

Non-interest expense for the fourth quarter of 2025 was $60.4 million, a decrease of $149,000 , or 0.2%, compared to $60.5 million for the third quarter of 2025. The decrease in non-interest expense was mainly due to lower loan and lease related expenses and lower data processing expenses, offset by higher salaries and benefits.

Our efficiency ratio was 50.32%(1) for the fourth quarter of 2025, compared to 51.00%(1) for the third quarter of 2025, an improvement of 68 basis points. The improvement in the efficiency ratio was mainly driven by decreased interest expense. Excluding significant items, our adjusted efficiency ratio was 50.15%(1) for the fourth quarter of 2025, compared to 50.27%(1) for the third quarter of 2025, an improvement of 12 basis points.

Full-year results

Non-interest expense for the year ended December 31, 2025 was $236.9 million, an increase of $18.1 million, or 8.3%, compared to $218.8 million for the year ended December 31, 2024. The increase in non-interest expense was mainly due to increased salaries and employee benefits, legal, audit, and other professional fees, and data processing, all primarily driven from merger-related activities.

Our efficiency ratio was 51.83%(1) for the year ended December 31, 2025, compared to 52.45%(1) for the year ended December 31, 2024, an improvement of 62 basis points. The improvement in the efficiency ratio was mainly driven by increased total revenues and lower interest expense. Excluding significant items, our adjusted efficiency ratio was 50.37%(1) for the year ended December 31, 2025, compared to 52.24%(1) for the year ended December 31, 2024, an improvement of 187 basis points, mainly due to higher revenues, lower interest expense, and lower adjusted non-interest expense.

Income Taxes

Quarterly results

We recorded income tax expense of $12.4 million during the fourth quarter of 2025, compared to $12.7 million during the third quarter of 2025. The effective tax rates were 26.4% and 25.5% for the fourth and third quarters of 2025, respectively.

Full-year results

We recorded income tax expense of $43.2 million during the year ended December 31, 2025, compared to $40.3 million during the year ended December 31, 2024. The effective tax rates were 24.9% and 25.0% for the years ended December 31, 2025 and December 31, 2024, respectively.

(1) Represents non-GAAP financial measures. See “Reconciliation of non-GAAP Financial Measures” for a reconciliation of our non-GAAP measures to the most directly comparable GAAP financial measure.

Byline Bancorp, Inc.

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STATEMENTS OF FINANCIAL CONDITION HIGHLIGHTS

Assets

Total assets were $9.7 billion as of December 31, 2025, a decrease of $159.7 million, or 1.6%, compared to $9.8 billion at September 30, 2025, and an increase of $156.1 million, or 1.6% compared to $9.5 billion as of December 31, 2024.

The decrease for the current quarter was mainly due to a decrease in cash and cash equivalents of $112.1 million and a decrease in securities of $107.1 million, offset by a $65.5 million increase to net loans and leases.

The increase for the current year was mainly due to a $591.7 million increase in net loans and leases, offset by a decrease of $414.0 million to cash and cash equivalents.

Allowance for Credit Losses

The ACL was $108.8 million as of December 31, 2025, an increase of $3.1 million, or 2.9%, from $105.7 million at September 30, 2025, mainly due to higher non-performing loans, and an increase of $10.8 million, or 11.1%, from $98.0 million as of December 31, 2024.

Net loan and lease charge-offs during the fourth quarter of 2025 were $6.7 million, or 0.36% of average loans and leases, on an annualized basis, a decrease of $400,000 compared to net charge-offs of $7.1 million, or 0.38% of average loans and leases, during the third quarter of 2025. The decrease in net charge-offs for the quarter was due to lower charge-offs in the commercial real estate portfolio.

Net loan and leases charge-offs during the year ended December 31, 2025 were $28.1 million, or 0.39% of average loans and leases, a decrease of $3.9 million compared to net charge-offs of $32.0 million, or 0.47% of average loans and leases, during the year ended December 31, 2024. The decrease in net charge-offs for the year was mainly due to higher recoveries and a decrease in commercial and industrial charge-offs.

Asset Quality

Non-performing assets were $74.7 million, or 0.77% of total assets, as of December 31, 2025, an increase of $7.3 million from $67.4 million, or 0.69% of total assets, at September 30, 2025. The increase was mainly driven by one loan reclassified to non-performing, offset by decreases to other real estate owned. The government guaranteed portion of non-performing loans included in non-performing assets was $9.7 million at December 31, 2025, compared to $8.4 million at September 30, 2025, an increase of $1.3 million.

Non-performing assets increased $7.4 million compared to December 31, 2024, primarily due to increases in non-accrual in commercial and industrial and commercial real estate loans, offset by decreases in other real estate owned. The government guaranteed portion of non-performing loans included in non-performing assets decreased $146,000 during 2025, from $9.9 million as of December 31, 2024, to $9.7 million as of December 31, 2025.

Deposits and Other Liabilities

Total deposits decreased $180.8 million, or 2.3% to $7.6 billion at December 31, 2025 from $7.8 billion as of September 30, 2025, and increased $188.8 million or 2.5% from $7.5 billion as of December 31, 2024. The decrease in deposits during the fourth quarter was mainly due to decreases in non-interest-bearing demand accounts, and decreases to time deposits. The increase during the year was due primarily to deposits acquired through acquisition.

Total borrowings and other liabilities were $737.3 million at December 31, 2025, a decrease of $9.2 million from $746.5 million at September 30, 2025, and a decrease of $209.1 million from $946.4 million as of December 31, 2024. The decrease for the quarter was primarily driven by the redemption of $75.0 million of subordinated notes, offset by higher Federal Home Loan Bank ("FHLB") advances. The decrease for the year was primarily due to lower FHLB advances.

Stockholders’ Equity

Total stockholders’ equity was $1.3 billion at December 31, 2025, an increase of $30.2 million, or 2.4%, from September 30, 2025, primarily due to an increase in retained earnings from net income. Total stockholders' equity increased $176.4 million, or 16.2% from December 31, 2024, due to increased retained earnings from net income, lower unrealized loss on securities available-for-sale in accumulated other comprehensive income, and from common stock issued in connection with the First Security acquisition.

During the quarter and year ended December 31, 2025, we purchased 345,706 and 922,729 shares of our common stock at an average price of $28.21 and $25.72, per share, respectively.

(1) Represents non-GAAP financial measures. See “Reconciliation of non-GAAP Financial Measures” for a reconciliation of our non-GAAP measures to the most directly comparable GAAP financial measure.

Byline Bancorp, Inc.

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Conference Call, Webcast and Slide Presentation

We will host a conference call and webcast at 9:00 a.m. Central Time on Friday, January 23, 2026, to discuss our quarterly financial results. Analysts and investors may participate in the question-and-answer session. The call can be accessed via telephone at (833) 470-1428; passcode 535219. A recorded replay can be accessed through February 6, 2026, by dialing (866) 813-9403; passcode: 656595.

A slide presentation relating to our fourth quarter 2025 results will be accessible prior to the conference call. The slide presentation and webcast of the conference call can be accessed on our investor relations website at www.bylinebancorp.com.

About Byline Bancorp, Inc.

Headquartered in Chicago, Byline Bancorp, Inc. is the parent company of Byline Bank, a full service commercial bank serving small- and medium-sized businesses, financial sponsors, and consumers. Byline Bank has approximately $9.6 billion in assets and operates 45 branch locations throughout the Chicago and Milwaukee metropolitan areas. Byline Bank offers a broad range of commercial and community banking products and services including small ticket equipment leasing solutions and is one of the top Small Business Administration lenders in the United States.

Forward-Looking Statements

This communication contains forward-looking statements within the meaning of the U.S. federal securities laws. Forward-looking statements include, without limitation, statements concerning plans, estimates, calculations, forecasts and projections with respect to the anticipated future performance of the Company. These statements are often, but not always, made through the use of words or phrases such as ‘‘may’’, ‘‘might’’, ‘‘should’’, ‘‘could’’, ‘‘predict’’, ‘‘potential’’, ‘‘believe’’, ‘‘expect’’, ‘‘continue’’, ‘‘will’’, ‘‘anticipate’’, ‘‘seek’’, ‘‘estimate’’, ‘‘intend’’, ‘‘plan’’, ‘‘projection’’, ‘‘would’’, ‘‘annualized’’, “target” and ‘‘outlook’’, or the negative version of those words or other comparable words or phrases of a future or forward-looking nature. Forward-looking statements involve estimates and known and unknown risks, and reflect various assumptions and involve elements of subjective judgment and analysis, which may or may not prove to be correct, and which are subject to uncertainties and contingencies outside the control of Byline and its respective affiliates, directors, employees and other representatives, which could cause actual results to differ materially from those presented in this communication.

No representations, warranties or guarantees are or will be made by Byline as to the reliability, accuracy or completeness of any forward-looking statements contained in this communication or that such forward-looking statements are or will remain based on reasonable assumptions. You should not place undue reliance on any forward-looking statements contained in this communication.

Certain risks and important factors that could affect Byline’s future results are identified in our Annual Report on Form 10-K and other reports we file with the Securities and Exchange Commission, including among other things under the heading “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2024. Any forward-looking statement speaks only as of the date on which it is made, and Byline undertakes no obligation to update any forward-looking statement, whether to reflect events or circumstances after the date on which the statement is made, to reflect new information or the occurrence of unanticipated events, or otherwise unless required under the federal securities laws.

Contact For Byline Bancorp, Inc.:

Investors / Media:
Brooks O. Rennie
Investor Relations Director
(312) 660-5805
brennie@bylinebank.com

Byline Bancorp, Inc.

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BYLINE BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (unaudited)

|  | December 31, |  |  | September 30, |  |  | December 31, |
(dollars in thousands) |  | 2025 |  |  | 2025 |  |  | 2024 |
ASSETS |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 60,184 |  |  | $ | 70,406 |  |  | $ | 58,759 |
Interest bearing deposits with other banks |  |  | 88,911 |  |  |  | 190,774 |  |  |  | 504,379 |
Cash and cash equivalents |  |  | 149,095 |  |  |  | 261,180 |  |  |  | 563,138 |
Equity and other securities, at fair value |  |  | 10,660 |  |  |  | 10,461 |  |  |  | 9,865 |
Securities available-for-sale, at fair value |  |  | 1,405,106 |  |  |  | 1,512,194 |  |  |  | 1,415,696 |
Securities held-to-maturity, at amortized cost |  |  | — |  |  |  | — |  |  |  | 605 |
Restricted stock, at cost |  |  | 21,314 |  |  |  | 15,934 |  |  |  | 27,452 |
Loans held for sale |  |  | 13,621 |  |  |  | 20,566 |  |  |  | 3,200 |
Loans and leases: |  |  |  |  |  |  |  |  |
Loans and leases |  |  | 7,509,369 |  |  |  | 7,440,755 |  |  |  | 6,906,822 |
Allowance for credit losses - loans and leases |  |  | (108,834 | ) |  |  | (105,717 | ) |  |  | (97,988 | )
Net loans and leases |  |  | 7,400,535 |  |  |  | 7,335,038 |  |  |  | 6,808,834 |
Servicing assets, at fair value |  |  | 19,234 |  |  |  | 19,019 |  |  |  | 18,952 |
Premises and equipment, net |  |  | 57,988 |  |  |  | 58,785 |  |  |  | 60,502 |
Other real estate owned, net |  |  | 3,394 |  |  |  | 4,220 |  |  |  | 5,170 |
Goodwill and other intangible assets, net |  |  | 200,520 |  |  |  | 202,014 |  |  |  | 198,098 |
Bank-owned life insurance |  |  | 107,462 |  |  |  | 106,575 |  |  |  | 100,083 |
Deferred tax assets, net |  |  | 41,779 |  |  |  | 49,918 |  |  |  | 56,458 |
Accrued interest receivable and other assets |  |  | 221,968 |  |  |  | 216,471 |  |  |  | 228,476 |
Total assets |  | $ | 9,652,676 |  |  | $ | 9,812,375 |  |  | $ | 9,496,529 |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |  |  |  |  |
LIABILITIES |  |  |  |  |  |  |  |  |
Non-interest-bearing demand deposits |  | $ | 1,818,888 |  |  | $ | 1,932,869 |  |  | $ | 1,756,098 |
Interest-bearing deposits |  |  | 5,828,555 |  |  |  | 5,895,328 |  |  |  | 5,702,530 |
Total deposits |  |  | 7,647,443 |  |  |  | 7,828,197 |  |  |  | 7,458,628 |
Other borrowings |  |  | 419,598 |  |  |  | 361,286 |  |  |  | 618,773 |
Subordinated notes, net |  |  | 73,940 |  |  |  | 148,971 |  |  |  | 74,040 |
Junior subordinated debentures issued to capital trusts, net |  |  | 71,409 |  |  |  | 71,272 |  |  |  | 70,890 |
Accrued expenses and other liabilities |  |  | 172,380 |  |  |  | 164,967 |  |  |  | 182,701 |
Total liabilities |  |  | 8,384,770 |  |  |  | 8,574,693 |  |  |  | 8,405,032 |
STOCKHOLDERS’ EQUITY |  |  |  |  |  |  |  |  |
Common stock |  |  | 471 |  |  |  | 471 |  |  |  | 455 |
Additional paid-in capital |  |  | 760,700 |  |  |  | 758,089 |  |  |  | 717,763 |
Retained earnings |  |  | 645,724 |  |  |  | 615,784 |  |  |  | 533,901 |
Treasury stock |  |  | (65,914 | ) |  |  | (56,959 | ) |  |  | (46,935 | )
Accumulated other comprehensive loss, net of tax |  |  | (73,075 | ) |  |  | (79,703 | ) |  |  | (113,687 | )
Total stockholders’ equity |  |  | 1,267,906 |  |  |  | 1,237,682 |  |  |  | 1,091,497 |
Total liabilities and stockholders’ equity |  | $ | 9,652,676 |  |  | $ | 9,812,375 |  |  | $ | 9,496,529 |

Byline Bancorp, Inc.

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BYLINE BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited)

|  | Three Months Ended |  |  | Year Ended |
(dollars in thousands, |  | December 31, |  |  | September 30, |  |  | December 31, |  |  | December 31, |  |  | December 31, |
except per share data) |  | 2025 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
INTEREST AND DIVIDEND INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and fees on loans and leases |  | $ | 129,394 |  |  | $ | 132,401 |  |  | $ | 123,702 |  |  | $ | 511,224 |  |  | $ | 502,353 |
Interest on securities |  |  | 12,431 |  |  |  | 13,289 |  |  |  | 11,710 |  |  |  | 51,754 |  |  |  | 43,218 |
Other interest and dividend income |  |  | 2,375 |  |  |  | 2,936 |  |  |  | 4,191 |  |  |  | 9,242 |  |  |  | 20,358 |
Total interest and dividend income |  |  | 144,200 |  |  |  | 148,626 |  |  |  | 139,603 |  |  |  | 572,220 |  |  |  | 565,929 |
INTEREST EXPENSE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 38,432 |  |  |  | 42,857 |  |  |  | 46,725 |  |  |  | 167,718 |  |  |  | 192,366 |
Other borrowings |  |  | 1,639 |  |  |  | 1,502 |  |  |  | 1,466 |  |  |  | 6,372 |  |  |  | 13,669 |
Subordinated notes and debentures |  |  | 2,874 |  |  |  | 4,377 |  |  |  | 2,888 |  |  |  | 12,782 |  |  |  | 11,848 |
Total interest expense |  |  | 42,945 |  |  |  | 48,736 |  |  |  | 51,079 |  |  |  | 186,872 |  |  |  | 217,883 |
Net interest income |  |  | 101,255 |  |  |  | 99,890 |  |  |  | 88,524 |  |  |  | 385,348 |  |  |  | 348,046 |
PROVISION FOR CREDIT LOSSES |  |  | 9,702 |  |  |  | 5,298 |  |  |  | 6,878 |  |  |  | 36,102 |  |  |  | 27,041 |
Net interest income after provision for credit losses |  |  | 91,553 |  |  |  | 94,592 |  |  |  | 81,646 |  |  |  | 349,246 |  |  |  | 321,005 |
NON-INTEREST INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees and service charges on deposits |  |  | 2,799 |  |  |  | 2,741 |  |  |  | 2,648 |  |  |  | 10,876 |  |  |  | 10,214 |
Loan servicing revenue |  |  | 3,085 |  |  |  | 3,062 |  |  |  | 3,151 |  |  |  | 12,261 |  |  |  | 12,905 |
Loan servicing asset revaluation |  |  | (1,107 | ) |  |  | (1,294 | ) |  |  | (1,350 | ) |  |  | (5,602 | ) |  |  | (6,704 | )
ATM and interchange fees |  |  | 975 |  |  |  | 1,015 |  |  |  | 1,083 |  |  |  | 4,083 |  |  |  | 4,464 |
Net gains (losses) on sales of securities available-for-sale |  |  | 16 |  |  |  | — |  |  |  | (699 | ) |  |  | (21 | ) |  |  | (699 | )
Change in fair value of equity securities, net |  |  | 199 |  |  |  | (298 | ) |  |  | 732 |  |  |  | 795 |  |  |  | 1,122 |
Net gains on sales of loans |  |  | 5,386 |  |  |  | 6,981 |  |  |  | 7,107 |  |  |  | 22,719 |  |  |  | 24,540 |
Wealth management and trust income |  |  | 1,324 |  |  |  | 1,366 |  |  |  | 1,110 |  |  |  | 4,846 |  |  |  | 4,310 |
Other non-interest income |  |  | 3,073 |  |  |  | 2,272 |  |  |  | 2,367 |  |  |  | 10,968 |  |  |  | 8,699 |
Total non-interest income |  |  | 15,750 |  |  |  | 15,845 |  |  |  | 16,149 |  |  |  | 60,925 |  |  |  | 58,851 |
NON-INTEREST EXPENSE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  | 38,813 |  |  |  | 37,492 |  |  |  | 37,281 |  |  |  | 150,376 |  |  |  | 140,119 |
Occupancy and equipment expense, net |  |  | 4,142 |  |  |  | 4,531 |  |  |  | 4,407 |  |  |  | 18,264 |  |  |  | 18,703 |
Impairment charge on assets held for sale |  |  | 195 |  |  |  | — |  |  |  | — |  |  |  | 195 |  |  |  | — |
Loan and lease related expenses |  |  | 584 |  |  |  | 1,274 |  |  |  | 660 |  |  |  | 3,623 |  |  |  | 2,789 |
Legal, audit, and other professional fees |  |  | 4,088 |  |  |  | 3,876 |  |  |  | 3,358 |  |  |  | 16,058 |  |  |  | 13,428 |
Data processing |  |  | 4,385 |  |  |  | 4,903 |  |  |  | 4,473 |  |  |  | 19,445 |  |  |  | 16,869 |
Net loss recognized on other real estate owned and other related expenses |  |  | 528 |  |  |  | 617 |  |  |  | 654 |  |  |  | 1,143 |  |  |  | 568 |
Other intangible assets amortization expense |  |  | 1,494 |  |  |  | 1,494 |  |  |  | 1,345 |  |  |  | 5,605 |  |  |  | 5,380 |
Other non-interest expense |  |  | 6,140 |  |  |  | 6,331 |  |  |  | 5,253 |  |  |  | 22,209 |  |  |  | 20,921 |
Total non-interest expense |  |  | 60,369 |  |  |  | 60,518 |  |  |  | 57,431 |  |  |  | 236,918 |  |  |  | 218,777 |
INCOME BEFORE PROVISION FOR INCOME TAXES |  |  | 46,934 |  |  |  | 49,919 |  |  |  | 40,364 |  |  |  | 173,253 |  |  |  | 161,079 |
PROVISION FOR INCOME TAXES |  |  | 12,413 |  |  |  | 12,719 |  |  |  | 10,044 |  |  |  | 43,202 |  |  |  | 40,320 |
NET INCOME |  | $ | 34,521 |  |  | $ | 37,200 |  |  | $ | 30,320 |  |  | $ | 130,051 |  |  | $ | 120,759 |
EARNINGS PER COMMON SHARE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.77 |  |  | $ | 0.82 |  |  | $ | 0.69 |  |  | $ | 2.90 |  |  | $ | 2.78 |
Diluted |  | $ | 0.76 |  |  | $ | 0.82 |  |  | $ | 0.69 |  |  | $ | 2.89 |  |  | $ | 2.75 |

Byline Bancorp, Inc.

Page 8 of 15

BYLINE BANCORP, INC. AND SUBSIDIARIES

SELECTED FINANCIAL DATA (unaudited)

| As of or For the Three Months Ended |  |  | As of or For the Year Ended |
(dollars in thousands, except share | December 31, |  |  | September 30, |  |  | December 31, |  |  | December 31, |  |  | December 31, |
and per share data) | 2025 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Earnings per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share | $ | 0.77 |  |  | $ | 0.82 |  |  | $ | 0.69 |  |  | $ | 2.90 |  |  | $ | 2.78 |
Diluted earnings per common share | $ | 0.76 |  |  | $ | 0.82 |  |  | $ | 0.69 |  |  | $ | 2.89 |  |  | $ | 2.75 |
Adjusted diluted earnings per common share(1)(3) | $ | 0.76 |  |  | $ | 0.83 |  |  | $ | 0.69 |  |  | $ | 3.00 |  |  | $ | 2.76 |
Weighted average common shares outstanding (basic) |  | 44,980,736 |  |  |  | 45,102,828 |  |  |  | 43,656,793 |  |  |  | 44,798,651 |  |  |  | 43,448,856 |
Weighted average common shares outstanding (diluted) |  | 45,330,163 |  |  |  | 45,372,602 |  |  |  | 44,179,818 |  |  |  | 45,063,611 |  |  |  | 43,853,939 |
Common shares outstanding |  | 45,545,928 |  |  |  | 45,859,977 |  |  |  | 44,459,584 |  |  |  | 45,545,928 |  |  |  | 44,459,584 |
Cash dividends per common share | $ | 0.10 |  |  | $ | 0.10 |  |  | $ | 0.09 |  |  | $ | 0.40 |  |  | $ | 0.36 |
Dividend payout ratio on common stock |  | 13.16 | % |  |  | 12.20 | % |  |  | 13.04 | % |  |  | 13.84 | % |  |  | 13.09 | %
Book value per common share | $ | 27.84 |  |  | $ | 26.99 |  |  | $ | 24.55 |  |  | $ | 27.84 |  |  | $ | 24.55 |
Tangible book value per common share(1) | $ | 23.44 |  |  | $ | 22.58 |  |  | $ | 20.09 |  |  | $ | 23.44 |  |  | $ | 20.09 |
Key Ratios and Performance Metrics (annualized where applicable) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest margin |  | 4.35 | % |  |  | 4.27 | % |  |  | 4.01 | % |  |  | 4.22 | % |  |  | 3.97 | %
Net interest margin, fully taxable equivalent (1)(4) |  | 4.36 | % |  |  | 4.28 | % |  |  | 4.02 | % |  |  | 4.23 | % |  |  | 3.98 | %
Average cost of deposits |  | 1.97 | % |  |  | 2.16 | % |  |  | 2.48 | % |  |  | 2.17 | % |  |  | 2.61 | %
Efficiency ratio(1)(2) |  | 50.32 | % |  |  | 51.00 | % |  |  | 53.58 | % |  |  | 51.83 | % |  |  | 52.45 | %
Adjusted efficiency ratio(1)(2)(3) |  | 50.15 | % |  |  | 50.27 | % |  |  | 53.37 | % |  |  | 50.37 | % |  |  | 52.24 | %
Non-interest income to total revenues(1) |  | 13.46 | % |  |  | 13.69 | % |  |  | 15.43 | % |  |  | 13.65 | % |  |  | 14.46 | %
Non-interest expense to average assets |  | 2.47 | % |  |  | 2.47 | % |  |  | 2.48 | % |  |  | 2.48 | % |  |  | 2.38 | %
Adjusted non-interest expense to average assets(1)(3) |  | 2.47 | % |  |  | 2.44 | % |  |  | 2.47 | % |  |  | 2.41 | % |  |  | 2.37 | %
Return on average stockholders' equity |  | 10.61 | % |  |  | 12.21 | % |  |  | 11.03 | % |  |  | 10.86 | % |  |  | 11.61 | %
Adjusted return on average stockholders' equity(1)(3) |  | 10.65 | % |  |  | 12.42 | % |  |  | 11.10 | % |  |  | 11.28 | % |  |  | 11.68 | %
Return on average assets |  | 1.41 | % |  |  | 1.52 | % |  |  | 1.31 | % |  |  | 1.36 | % |  |  | 1.31 | %
Adjusted return on average assets(1)(3) |  | 1.42 | % |  |  | 1.54 | % |  |  | 1.32 | % |  |  | 1.41 | % |  |  | 1.32 | %
Pre-tax pre-provision return on average assets(1) |  | 2.32 | % |  |  | 2.25 | % |  |  | 2.04 | % |  |  | 2.19 | % |  |  | 2.05 | %
Adjusted pre-tax pre-provision return on average assets(1)(3) |  | 2.33 | % |  |  | 2.29 | % |  |  | 2.05 | % |  |  | 2.26 | % |  |  | 2.06 | %
Return on average tangible common stockholders' equity(1) |  | 12.97 | % |  |  | 15.11 | % |  |  | 13.92 | % |  |  | 13.47 | % |  |  | 14.85 | %
Adjusted return on average tangible common stockholders' equity(1)(3) |  | 13.02 | % |  |  | 15.36 | % |  |  | 14.02 | % |  |  | 13.97 | % |  |  | 14.94 | %
Non-interest-bearing deposits to total deposits |  | 23.78 | % |  |  | 24.69 | % |  |  | 23.54 | % |  |  | 23.78 | % |  |  | 23.54 | %
Loans and leases held for sale and loans and lease held for investment to total deposits |  | 98.37 | % |  |  | 95.31 | % |  |  | 92.64 | % |  |  | 98.37 | % |  |  | 92.64 | %
Deposits to total liabilities |  | 91.21 | % |  |  | 91.29 | % |  |  | 88.74 | % |  |  | 91.21 | % |  |  | 88.74 | %
Deposits per branch | $ | 169,943 |  |  | $ | 173,960 |  |  | $ | 162,144 |  |  | $ | 169,943 |  |  | $ | 162,144 |
Asset Quality Ratios |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-performing loans and leases to total loans and leases held for investment, net before ACL |  | 0.95 | % |  |  | 0.85 | % |  |  | 0.90 | % |  |  | 0.95 | % |  |  | 0.90 | %
Total non-performing assets as a percentage of total assets |  | 0.77 | % |  |  | 0.69 | % |  |  | 0.71 | % |  |  | 0.77 | % |  |  | 0.71 | %
ACL to total loans and leases held for investment, net before ACL |  | 1.45 | % |  |  | 1.42 | % |  |  | 1.42 | % |  |  | 1.45 | % |  |  | 1.42 | %
Net charge-offs to average total loans and leases held for investment, net before ACL - loans and leases |  | 0.36 | % |  |  | 0.38 | % |  |  | 0.45 | % |  |  | 0.39 | % |  |  | 0.47 | %
Capital Ratios |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity to total assets |  | 13.14 | % |  |  | 12.61 | % |  |  | 11.49 | % |  |  | 13.14 | % |  |  | 11.49 | %
Tangible common equity to tangible assets(1) |  | 11.29 | % |  |  | 10.78 | % |  |  | 9.61 | % |  |  | 11.29 | % |  |  | 9.61 | %
Leverage ratio |  | 12.53 | % |  |  | 12.20 | % |  |  | 11.74 | % |  |  | 12.53 | % |  |  | 11.74 | %
Common equity tier 1 capital ratio |  | 12.33 | % |  |  | 12.15 | % |  |  | 11.70 | % |  |  | 12.33 | % |  |  | 11.70 | %
Tier 1 capital ratio |  | 13.29 | % |  |  | 13.12 | % |  |  | 12.73 | % |  |  | 13.29 | % |  |  | 12.73 | %
Total capital ratio |  | 15.34 | % |  |  | 15.81 | % |  |  | 14.74 | % |  |  | 15.34 | % |  |  | 14.74 | %

(1) Represents a non-GAAP financial measure. See “Reconciliation of non-GAAP Financial Measures” for a reconciliation of our non-GAAP measures to the most directly comparable GAAP financial measure.

(2) Represents non-interest expense less amortization of intangible assets divided by net interest income and non-interest income.

(3) Calculation excludes merger-related expenses and expenses related to the secondary public offering of common stock.

(4) Interest income and rates include the effects of a tax equivalent adjustment to adjust tax exempt investment income on tax exempt investment securities to a fully taxable basis, assuming a federal income tax rate of 21%.

Byline Bancorp, Inc.

Page 9 of 15

BYLINE BANCORP, INC. AND SUBSIDIARIES

QUARTER-TO-DATE STATEMENT OF AVERAGE INTEREST-EARNING ASSETS AND AVERAGE INTEREST-BEARING LIABILITIES (unaudited)

| For the Three Months Ended |
| December 31, 2025 |  |  | September 30, 2025 |  |  | December 31, 2024 |
(dollars in thousands) | Average Balance(5) |  |  | Interest Inc / Exp |  |  | Avg. Yield / Rate |  |  | Average Balance(5) |  |  | Interest Inc / Exp |  |  | Avg. Yield / Rate |  |  | Average Balance(5) |  |  | Interest Inc / Exp |  |  | Avg. Yield / Rate |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 190,859 |  |  | $ | 1,708 |  |  |  | 3.55 | % |  | $ | 193,683 |  |  | $ | 1,878 |  |  |  | 3.84 | % |  | $ | 272,409 |  |  | $ | 2,721 |  |  |  | 3.97 | %
Loans and leases(1) |  | 7,387,460 |  |  |  | 129,394 |  |  |  | 6.95 | % |  |  | 7,355,958 |  |  |  | 132,401 |  |  |  | 7.14 | % |  |  | 6,828,128 |  |  |  | 123,702 |  |  |  | 7.21 | %
Taxable securities |  | 1,505,617 |  |  |  | 12,296 |  |  |  | 3.24 | % |  |  | 1,585,013 |  |  |  | 13,491 |  |  |  | 3.38 | % |  |  | 1,529,134 |  |  |  | 12,317 |  |  |  | 3.20 | %
Tax-exempt securities(2) |  | 146,863 |  |  |  | 1,015 |  |  |  | 2.74 | % |  |  | 153,424 |  |  |  | 1,084 |  |  |  | 2.80 | % |  |  | 155,505 |  |  |  | 1,093 |  |  |  | 2.80 | %
Total interest-earning assets | $ | 9,230,799 |  |  | $ | 144,413 |  |  |  | 6.21 | % |  | $ | 9,288,078 |  |  | $ | 148,854 |  |  |  | 6.36 | % |  | $ | 8,785,176 |  |  | $ | 139,833 |  |  |  | 6.33 | %
Allowance for credit losses - loans and leases |  | (108,557 | ) |  |  |  |  |  |  |  |  | (109,877 | ) |  |  |  |  |  |  |  |  | (100,281 | ) |  |  |  |  |  |
All other assets |  | 560,861 |  |  |  |  |  |  |  |  |  | 538,719 |  |  |  |  |  |  |  |  |  | 516,740 |  |  |  |  |  |  |
TOTAL ASSETS | $ | 9,683,103 |  |  |  |  |  |  |  |  | $ | 9,716,920 |  |  |  |  |  |  |  |  | $ | 9,201,635 |  |  |  |  |  |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest checking | $ | 890,025 |  |  | $ | 3,686 |  |  |  | 1.64 | % |  | $ | 834,763 |  |  | $ | 3,682 |  |  |  | 1.75 | % |  | $ | 717,222 |  |  | $ | 3,478 |  |  |  | 1.93 | %
Money market accounts |  | 2,937,945 |  |  |  | 21,093 |  |  |  | 2.85 | % |  |  | 2,986,541 |  |  |  | 23,468 |  |  |  | 3.12 | % |  |  | 2,480,805 |  |  |  | 19,951 |  |  |  | 3.20 | %
Savings |  | 489,899 |  |  |  | 132 |  |  |  | 0.11 | % |  |  | 495,506 |  |  |  | 136 |  |  |  | 0.11 | % |  |  | 486,262 |  |  |  | 130 |  |  |  | 0.11 | %
Time deposits |  | 1,521,864 |  |  |  | 13,521 |  |  |  | 3.52 | % |  |  | 1,654,056 |  |  |  | 15,571 |  |  |  | 3.73 | % |  |  | 2,020,225 |  |  |  | 23,166 |  |  |  | 4.56 | %
Total interest-bearing deposits |  | 5,839,733 |  |  |  | 38,432 |  |  |  | 2.61 | % |  |  | 5,970,866 |  |  |  | 42,857 |  |  |  | 2.85 | % |  |  | 5,704,514 |  |  |  | 46,725 |  |  |  | 3.26 | %
Other borrowings |  | 332,284 |  |  |  | 1,639 |  |  |  | 1.96 | % |  |  | 307,457 |  |  |  | 1,502 |  |  |  | 1.94 | % |  |  | 301,959 |  |  |  | 1,466 |  |  |  | 1.93 | %
Subordinated notes and debentures |  | 145,297 |  |  |  | 2,874 |  |  |  | 7.85 | % |  |  | 190,074 |  |  |  | 4,377 |  |  |  | 9.14 | % |  |  | 144,853 |  |  |  | 2,888 |  |  |  | 7.93 | %
Total borrowings |  | 477,581 |  |  |  | 4,513 |  |  |  | 3.75 | % |  |  | 497,531 |  |  |  | 5,879 |  |  |  | 4.69 | % |  |  | 446,812 |  |  |  | 4,354 |  |  |  | 3.88 | %
Total interest-bearing liabilities | $ | 6,317,314 |  |  | $ | 42,945 |  |  |  | 2.70 | % |  | $ | 6,468,397 |  |  | $ | 48,736 |  |  |  | 2.99 | % |  | $ | 6,151,326 |  |  | $ | 51,079 |  |  |  | 3.30 | %
Non-interest-bearing demand deposits |  | 1,910,132 |  |  |  |  |  |  |  |  |  | 1,888,693 |  |  |  |  |  |  |  |  |  | 1,777,273 |  |  |  |  |  |  |
Other liabilities |  | 164,868 |  |  |  |  |  |  |  |  |  | 151,540 |  |  |  |  |  |  |  |  |  | 179,011 |  |  |  |  |  |  |
Total stockholders’ equity |  | 1,290,789 |  |  |  |  |  |  |  |  |  | 1,208,290 |  |  |  |  |  |  |  |  |  | 1,094,025 |  |  |  |  |  |  |
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY | $ | 9,683,103 |  |  |  |  |  |  |  |  | $ | 9,716,920 |  |  |  |  |  |  |  |  | $ | 9,201,635 |  |  |  |  |  |  |
Net interest spread(3) |  |  |  |  |  |  |  | 3.51 | % |  |  |  |  |  |  |  |  | 3.37 | % |  |  |  |  |  |  |  |  | 3.03 | %
Net interest income, fully taxable equivalent |  |  |  | $ | 101,468 |  |  |  |  |  |  |  |  | $ | 100,118 |  |  |  |  |  |  |  |  | $ | 88,754 |  |  |  |
Net interest margin, fully taxable equivalent(2)(4) |  |  |  |  |  |  |  | 4.36 | % |  |  |  |  |  |  |  |  | 4.28 | % |  |  |  |  |  |  |  |  | 4.02 | %
Less: Tax-equivalent adjustment |  |  |  |  | 213 |  |  |  | 0.01 | % |  |  |  |  |  | 228 |  |  |  | 0.01 | % |  |  |  |  |  | 230 |  |  |  | 0.01 | %
Net interest income |  |  |  | $ | 101,255 |  |  |  |  |  |  |  |  | $ | 99,890 |  |  |  |  |  |  |  |  | $ | 88,524 |  |  |  |
Net interest margin(4) |  |  |  |  |  |  |  | 4.35 | % |  |  |  |  |  |  |  |  | 4.27 | % |  |  |  |  |  |  |  |  | 4.01 | %
Net loan accretion impact on margin |  |  |  | $ | 2,312 |  |  |  | 0.10 | % |  |  |  |  | $ | 2,528 |  |  |  | 0.11 | % |  |  |  |  | $ | 2,590 |  |  |  | 0.12 | %

(1) Loan and lease balances are net of deferred origination fees and costs and initial direct costs. Non-accrual loans and leases are included in total loan and lease balances.

(2) Interest income and rates include the effects of a tax equivalent adjustment to adjust tax exempt investment income on tax exempt investment securities to a fully taxable basis, assuming a federal income tax rate of 21%.

(3) Represents the average rate earned on interest-earning assets minus the average rate paid on interest-bearing liabilities.

(4) Represents net interest income (annualized) divided by total average earning assets.

(5) Average balances are average daily balances.

Byline Bancorp, Inc.

Page 10 of 15

BYLINE BANCORP, INC. AND SUBSIDIARIES

YEAR-TO-DATE STATEMENT OF AVERAGE INTEREST-EARNING ASSETS AND AVERAGE INTEREST-BEARING LIABILITIES (unaudited)

|  | For the Year Ended |
|  | December 31, 2025 |  |  | December 31, 2024 |
(dollars in thousands) |  | Average Balance(4) |  |  | Interest Inc / Exp |  |  | Average Yield / Rate |  |  | Average Balance(4) |  |  | Interest Inc / Exp |  |  | Average Yield / Rate |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 175,760 |  |  | $ | 6,270 |  |  |  | 3.57 | % |  | $ | 346,777 |  |  | $ | 15,635 |  |  |  | 4.51 | %
Loans and leases(1) |  |  | 7,226,607 |  |  |  | 511,224 |  |  |  | 7.07 | % |  |  | 6,786,547 |  |  |  | 502,353 |  |  |  | 7.40 | %
Taxable securities |  |  | 1,575,363 |  |  |  | 51,338 |  |  |  | 3.26 | % |  |  | 1,483,640 |  |  |  | 44,476 |  |  |  | 3.00 | %
Tax-exempt securities(2) |  |  | 152,466 |  |  |  | 4,289 |  |  |  | 2.81 | % |  |  | 157,050 |  |  |  | 4,386 |  |  |  | 2.79 | %
Total interest-earning assets |  | $ | 9,130,196 |  |  | $ | 573,121 |  |  |  | 6.28 | % |  | $ | 8,774,014 |  |  | $ | 566,850 |  |  |  | 6.46 | %
Allowance for credit losses - loans and leases |  |  | (106,092 | ) |  |  |  |  |  |  |  |  | (101,695 | ) |  |  |  |  |  |
All other assets |  |  | 532,850 |  |  |  |  |  |  |  |  |  | 515,023 |  |  |  |  |  |  |
TOTAL ASSETS |  | $ | 9,556,954 |  |  |  |  |  |  |  |  | $ | 9,187,342 |  |  |  |  |  |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest checking |  | $ | 828,122 |  |  | $ | 14,181 |  |  |  | 1.71 | % |  | $ | 695,156 |  |  | $ | 14,442 |  |  |  | 2.08 | %
Money market accounts |  |  | 2,860,470 |  |  |  | 86,928 |  |  |  | 3.04 | % |  |  | 2,344,309 |  |  |  | 80,960 |  |  |  | 3.45 | %
Savings |  |  | 494,264 |  |  |  | 533 |  |  |  | 0.11 | % |  |  | 506,889 |  |  |  | 711 |  |  |  | 0.14 | %
Time deposits |  |  | 1,701,328 |  |  |  | 66,076 |  |  |  | 3.88 | % |  |  | 2,024,942 |  |  |  | 96,253 |  |  |  | 4.75 | %
Total interest-bearing deposits |  |  | 5,884,184 |  |  |  | 167,718 |  |  |  | 2.85 | % |  |  | 5,571,296 |  |  |  | 192,366 |  |  |  | 3.45 | %
Other borrowings |  |  | 319,151 |  |  |  | 6,372 |  |  |  | 2.00 | % |  |  | 442,364 |  |  |  | 13,648 |  |  |  | 3.09 | %
Federal funds purchased |  |  | — |  |  |  | — |  |  |  | 0.00 | % |  |  | 348 |  |  |  | 21 |  |  |  | 6.05 | %
Subordinated notes and debentures |  |  | 156,484 |  |  |  | 12,782 |  |  |  | 8.17 | % |  |  | 144,624 |  |  |  | 11,848 |  |  |  | 8.19 | %
Total borrowings |  |  | 475,635 |  |  |  | 19,154 |  |  |  | 4.03 | % |  |  | 587,336 |  |  |  | 25,517 |  |  |  | 4.34 | %
Total interest-bearing liabilities |  | $ | 6,359,819 |  |  | $ | 186,872 |  |  |  | 2.94 | % |  | $ | 6,158,632 |  |  | $ | 217,883 |  |  |  | 3.54 | %
Non-interest-bearing demand deposits |  |  | 1,833,596 |  |  |  |  |  |  |  |  |  | 1,802,258 |  |  |  |  |  |  |
Other liabilities |  |  | 166,063 |  |  |  |  |  |  |  |  |  | 185,937 |  |  |  |  |  |  |
Total stockholders’ equity |  |  | 1,197,476 |  |  |  |  |  |  |  |  |  | 1,040,515 |  |  |  |  |  |  |
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY |  | $ | 9,556,954 |  |  |  |  |  |  |  |  | $ | 9,187,342 |  |  |  |  |  |  |
Net interest spread(3) |  |  |  |  |  |  |  |  | 3.34 | % |  |  |  |  |  |  |  |  | 2.92 | %
Net interest income, fully taxable equivalent |  |  |  |  | $ | 386,249 |  |  |  |  |  |  |  |  | $ | 348,967 |  |  |  |
Net interest margin, fully taxable equivalent(2)(4) |  |  |  |  |  |  |  |  | 4.23 | % |  |  |  |  |  |  |  |  | 3.98 | %
Less: Tax-equivalent adjustment |  |  |  |  |  | 901 |  |  |  | 0.01 | % |  |  |  |  |  | 921 |  |  |  | 0.01 | %
Net interest income |  |  |  |  | $ | 385,348 |  |  |  |  |  |  |  |  | $ | 348,046 |  |  |  |
Net interest margin(4) |  |  |  |  |  |  |  |  | 4.22 | % |  |  |  |  |  |  |  |  | 3.97 | %
Net loan accretion impact on margin |  |  |  |  | $ | 10,413 |  |  |  | 0.11 | % |  |  |  |  | $ | 13,511 |  |  |  | 0.15 | %

(1) Loan and lease balances are net of deferred origination fees and costs and initial direct costs. Non-accrual loans and leases are included in total loan and lease balances.

(2) Interest income and rates include the effects of a tax equivalent adjustment to adjust tax exempt investment income on tax exempt investment securities to a fully taxable basis, assuming a federal income tax rate of 21%.

(3) Represents the average rate earned on interest-earning assets minus the average rate paid on interest-bearing liabilities.

(4) Represents net interest income (annualized) divided by total average earning assets.

(5) Average balances are average daily balances.

Byline Bancorp, Inc.

Page 11 of 15

BYLINE BANCORP, INC. AND SUBSIDIARIES

SELECTED BALANCE SHEET TABLES AND FINANCIAL RATIOS (unaudited)

The following table presents our allocation of originated, purchased credit deteriorated (PCD), and acquired non-credit-deteriorated loans and leases at the dates indicated:

|  | December 31, 2025 |  |  | September 30, 2025 |  |  | December 31, 2024 |
(dollars in thousands) |  | Amount |  |  | % of Total |  |  | Amount |  |  | % of Total |  |  | Amount |  |  | % of Total |
Originated loans and leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 2,338,109 |  |  |  | 31.1 | % |  | $ | 2,234,986 |  |  |  | 30.0 | % |  | $ | 2,071,952 |  |  |  | 30.0 | %
Residential real estate |  |  | 567,158 |  |  |  | 7.6 | % |  |  | 552,984 |  |  |  | 7.4 | % |  |  | 513,422 |  |  |  | 7.4 | %
Construction, land development, and other land |  |  | 360,003 |  |  |  | 4.8 | % |  |  | 412,032 |  |  |  | 5.6 | % |  |  | 429,596 |  |  |  | 6.2 | %
Commercial and industrial |  |  | 2,856,214 |  |  |  | 38.0 | % |  |  | 2,804,434 |  |  |  | 37.7 | % |  |  | 2,509,083 |  |  |  | 36.3 | %
Installment and other |  |  | 3,470 |  |  |  | 0.0 | % |  |  | 2,431 |  |  |  | 0.0 | % |  |  | 3,847 |  |  |  | 0.1 | %
Leasing financing receivables |  |  | 752,306 |  |  |  | 10.0 | % |  |  | 750,531 |  |  |  | 10.1 | % |  |  | 715,899 |  |  |  | 10.4 | %
Total originated loans and leases |  | $ | 6,877,260 |  |  |  | 91.5 | % |  | $ | 6,757,398 |  |  |  | 90.8 | % |  | $ | 6,243,799 |  |  |  | 90.4 | %
Purchased credit deteriorated loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 68,987 |  |  |  | 0.9 | % |  | $ | 71,359 |  |  |  | 1.0 | % |  | $ | 82,934 |  |  |  | 1.2 | %
Residential real estate |  |  | 20,788 |  |  |  | 0.3 | % |  |  | 24,061 |  |  |  | 0.3 | % |  |  | 30,515 |  |  |  | 0.4 | %
Construction, land development, and other land |  |  | 2,533 |  |  |  | 0.0 | % |  |  | 2,513 |  |  |  | 0.0 | % |  |  | — |  |  |  | — |
Commercial and industrial |  |  | 12,570 |  |  |  | 0.2 | % |  |  | 19,193 |  |  |  | 0.3 | % |  |  | 14,081 |  |  |  | 0.2 | %
Installment and other |  |  | 73 |  |  |  | 0.0 | % |  |  | 81 |  |  |  | 0.0 | % |  |  | 105 |  |  |  | 0.0 | %
Total purchased credit deteriorated loans |  | $ | 104,951 |  |  |  | 1.4 | % |  | $ | 117,207 |  |  |  | 1.6 | % |  | $ | 127,635 |  |  |  | 1.8 | %
Acquired non-credit-deteriorated loans and leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 200,089 |  |  |  | 2.7 | % |  | $ | 215,801 |  |  |  | 2.9 | % |  | $ | 199,531 |  |  |  | 2.9 | %
Residential real estate |  |  | 169,478 |  |  |  | 2.3 | % |  |  | 178,896 |  |  |  | 2.4 | % |  |  | 182,165 |  |  |  | 2.6 | %
Construction, land development, and other land |  |  | 45,542 |  |  |  | 0.6 | % |  |  | 50,493 |  |  |  | 0.7 | % |  |  | 59,673 |  |  |  | 0.9 | %
Commercial and industrial |  |  | 97,786 |  |  |  | 1.3 | % |  |  | 106,827 |  |  |  | 1.4 | % |  |  | 93,969 |  |  |  | 1.4 | %
Installment and other |  |  | 14,263 |  |  |  | 0.2 | % |  |  | 14,133 |  |  |  | 0.2 | % |  |  | 14 |  |  |  | 0.0 | %
Leasing financing receivables |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 36 |  |  |  | 0.0 | %
Total acquired non-credit-deteriorated loans and leases |  | $ | 527,158 |  |  |  | 7.1 | % |  | $ | 566,150 |  |  |  | 7.6 | % |  | $ | 535,388 |  |  |  | 7.8 | %
Total loans and leases |  | $ | 7,509,369 |  |  |  | 100.0 | % |  | $ | 7,440,755 |  |  |  | 100.0 | % |  | $ | 6,906,822 |  |  |  | 100.0 | %
Allowance for credit losses - loans and leases |  |  | (108,834 | ) |  |  |  |  |  | (105,717 | ) |  |  |  |  |  | (97,988 | ) |  |  |
Total loans and leases, net of allowance for credit losses - loans and leases |  | $ | 7,400,535 |  |  |  |  |  | $ | 7,335,038 |  |  |  |  |  | $ | 6,808,834 |  |  |  |

The following table presents the balance and activity within the allowance for credit losses - loans and lease for the periods indicated:

|  | Three Months Ended |  |  | Year Ended |
|  | December 31, |  |  | September 30, |  |  | December 31, |  |  | December 31, |  |  | December 31, |
(dollars in thousands) |  | 2025 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
ACL - loans and leases, beginning of period |  | $ | 105,717 |  |  | $ | 107,727 |  |  | $ | 98,860 |  |  | $ | 97,988 |  |  | $ | 101,686 |
Adjustment for acquired PCD loans |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,206 |  |  |  | — |
Provision for credit losses - loans and leases |  |  | 9,824 |  |  |  | 5,097 |  |  |  | 6,920 |  |  |  | 35,754 |  |  |  | 28,286 |
Net charge-offs - loans and leases |  |  | (6,707 | ) |  |  | (7,107 | ) |  |  | (7,792 | ) |  |  | (28,114 | ) |  |  | (31,984 | )
ACL - loans and leases, end of period |  | $ | 108,834 |  |  | $ | 105,717 |  |  | $ | 97,988 |  |  | $ | 108,834 |  |  | $ | 97,988 |
Net charge-offs - loans and leases to average total loans and leases held for investment, net before ACL |  |  | 0.36 | % |  |  | 0.38 | % |  |  | 0.45 | % |  |  | 0.39 | % |  |  | 0.47 | %
Provision for credit losses - loans and leases to net charge-offs - loans and leases during the period |  |  | 1.46 | x |  |  | 0.72 | x |  |  | 0.89 | x |  |  | 1.27 | x |  |  | 0.88 | x

Byline Bancorp, Inc.

Page 12 of 15

BYLINE BANCORP, INC. AND SUBSIDIARIES

SELECTED BALANCE SHEET TABLES AND FINANCIAL RATIOS (unaudited)

The following table presents the amounts of non-performing loans and leases and other real estate owned at the date indicated:

|  |  |  |  |  |  |  |  |  |  | December 31, 2025 |
|  |  |  |  |  |  |  |  |  |  | Change from |
(dollars in thousands) |  | December 31, 2025 |  |  | September 30, 2025 |  |  | December 31, 2024 |  |  | September 30, 2025 |  |  | December 31, 2024 |
Non-performing assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans and leases |  | $ | 71,290 |  |  | $ | 63,158 |  |  | $ | 62,076 |  |  |  | 12.9 | % |  |  | 14.8 | %
Past due loans and leases 90 days or more and still accruing interest |  |  | — |  |  |  | — |  |  |  | — |  |  | —% |  |  | —% |
Total non-performing loans and leases |  | $ | 71,290 |  |  | $ | 63,158 |  |  | $ | 62,076 |  |  |  | 12.9 | % |  |  | 14.8 | %
Other real estate owned |  |  | 3,394 |  |  |  | 4,220 |  |  |  | 5,170 |  |  |  | (19.6 | )% |  |  | (34.4 | )%
Total non-performing assets |  | $ | 74,684 |  |  | $ | 67,378 |  |  | $ | 67,246 |  |  |  | 10.8 | % |  |  | 11.1 | %
Total non-performing loans and leases as a percentage of total loans and leases |  |  | 0.95 | % |  |  | 0.85 | % |  |  | 0.90 | % |  |  |  |  |  |
Total non-performing assets as a percentage of total assets |  |  | 0.77 | % |  |  | 0.69 | % |  |  | 0.71 | % |  |  |  |  |  |
Allowance for credit losses - loans and lease as a percentage of non-performing loans and leases |  |  | 152.66 | % |  |  | 167.38 | % |  |  | 157.85 | % |  |  |  |  |  |
Non-performing assets guaranteed by U.S. government: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans guaranteed |  | $ | 9,716 |  |  | $ | 8,417 |  |  | $ | 9,862 |  |  |  | 15.4 | % |  |  | (1.5 | )%
Past due loans 90 days or more and still accruing interest guaranteed |  |  | — |  |  |  | — |  |  |  | — |  |  | —% |  |  | —% |
Total non-performing loans guaranteed |  | $ | 9,716 |  |  | $ | 8,417 |  |  | $ | 9,862 |  |  |  | 15.4 | % |  |  | (1.5 | )%
Total non-performing loans and leases not guaranteed as a percentage of total loans and leases |  |  | 0.82 | % |  |  | 0.74 | % |  |  | 0.76 | % |  |  |  |  |  |
Total non-performing assets not guaranteed as a percentage of total assets |  |  | 0.67 | % |  |  | 0.60 | % |  |  | 0.60 | % |  |  |  |  |  |

The following table presents the composition of deposits at the dates indicated:

|  |  |  |  |  |  |  |  |  | December 31, 2025 |
|  |  |  |  |  |  |  |  |  | Change from |
(dollars in thousands) | December 31, 2025 |  |  | September 30, 2025 |  |  | December 31, 2024 |  |  | September 30, 2025 |  |  | December 31, 2024 |
Non-interest-bearing demand deposits | $ | 1,818,888 |  |  | $ | 1,932,869 |  |  | $ | 1,756,098 |  |  |  | (5.9 | )% |  |  | 3.6 | %
Interest-bearing checking accounts |  | 878,638 |  |  |  | 868,922 |  |  |  | 767,835 |  |  |  | 1.1 | % |  |  | 14.4 | %
Money market demand accounts |  | 2,942,927 |  |  |  | 2,957,995 |  |  |  | 2,518,157 |  |  |  | (0.5 | )% |  |  | 16.9 | %
Other savings |  | 489,504 |  |  |  | 488,894 |  |  |  | 483,650 |  |  |  | 0.1 | % |  |  | 1.2 | %
Time deposits (below $250,000) |  | 1,096,015 |  |  |  | 1,151,764 |  |  |  | 1,498,277 |  |  |  | (4.8 | )% |  |  | (26.8 | )%
Time deposits ($250,000 and above) |  | 421,471 |  |  |  | 427,753 |  |  |  | 434,611 |  |  |  | (1.5 | )% |  |  | (3.0 | )%
Total deposits | $ | 7,647,443 |  |  | $ | 7,828,197 |  |  | $ | 7,458,628 |  |  |  | (2.3 | )% |  |  | 2.5 | %

Byline Bancorp, Inc.

Page 13 of 15

BYLINE BANCORP, INC. AND SUBSIDIARIES

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES (unaudited)

Non-GAAP Financial Measures

This release contains certain financial information determined by methods other than in accordance with accounting principles generally accepted in the United States of America (“GAAP”). These measures include adjusted net income, adjusted diluted earnings per share, adjusted non-interest expense, adjusted non-interest expense excluding amortization of intangible assets, adjusted efficiency ratio, adjusted non-interest expense to average assets, tax equivalent net interest income, tax-equivalent net interest margin, total revenue, non-interest income to total revenues, adjusted return on average stockholders’ equity, adjusted return on average assets, pre-tax pre-provision net income, adjusted pre-tax pre-provision net income, pre-tax pre-provision return on average assets, adjusted pre-tax pre-provision return on average assets, tangible common equity, tangible assets, tangible net income available to common stockholders, adjusted tangible net income available to common stockholders, tangible book value per common share, tangible common equity to tangible assets, return on average tangible common stockholders' equity, and adjusted return on average tangible common stockholders' equity. Management believes that these non-GAAP financial measures provide useful information to management and investors that is supplementary to the Company’s financial condition, results of operations and cash flows computed in accordance with GAAP; however, management acknowledges that our non-GAAP financial measures have a number of limitations. As such, these disclosures should not be viewed as a substitute for results determined in accordance with GAAP financial measures that we and other companies use. Management also uses these measures for peer comparison. See below in the financial schedules included in this press release for a reconciliation of the non-GAAP financial measures to the comparable GAAP financial measures. Additionally, please refer to the Company’s Annual Report on Form 10-K for the detailed definitions of these non-GAAP financial measures.

|  | As of or For the Three Months Ended |  |  | As of or For the Year Ended |
|  | December 31, |  |  | September 30, |  |  | December 31, |  |  | December 31, |  |  | December 31, |
(dollars in thousands, except per share data) |  | 2025 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Net income and earnings per share excluding significant items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reported Net Income |  | $ | 34,521 |  |  | $ | 37,200 |  |  | $ | 30,320 |  |  | $ | 130,051 |  |  | $ | 120,759 |
Significant items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges on assets held for sale and ROU assets |  |  | 195 |  |  |  | — |  |  |  | — |  |  |  | 195 |  |  |  | 194 |
Merger-related expenses |  |  | — |  |  |  | — |  |  |  | 218 |  |  |  | 5,087 |  |  |  | 629 |
Secondary public offering of common stock expenses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 413 |  |  |  | — |
Loss on extinguishment of debt |  |  | — |  |  |  | 843 |  |  |  | — |  |  |  | 843 |  |  |  | — |
Tax benefit |  |  | (50 | ) |  |  | (221 | ) |  |  | (1 | ) |  |  | (1,522 | ) |  |  | (85 | )
Adjusted Net Income |  | $ | 34,666 |  |  | $ | 37,822 |  |  | $ | 30,537 |  |  | $ | 135,067 |  |  | $ | 121,497 |
Reported Diluted Earnings per Share |  | $ | 0.76 |  |  | $ | 0.82 |  |  | $ | 0.69 |  |  | $ | 2.89 |  |  | $ | 2.75 |
Significant items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges on assets held for sale and ROU assets |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Merger-related expenses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.11 |  |  |  | 0.01 |
Secondary public offering of common stock expenses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.01 |  |  |  | — |
Loss on extinguishment of debt |  |  | — |  |  |  | 0.02 |  |  |  | — |  |  |  | 0.02 |  |  |  | — |
Tax benefit |  |  | — |  |  |  | (0.01 | ) |  |  | — |  |  |  | (0.03 | ) |  |  | — |
Adjusted Diluted Earnings per Share |  | $ | 0.76 |  |  | $ | 0.83 |  |  | $ | 0.69 |  |  | $ | 3.00 |  |  | $ | 2.76 |

Byline Bancorp, Inc.

Page 14 of 15

BYLINE BANCORP, INC. AND SUBSIDIARIES

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES (continued) (unaudited)

|  | As of or For the Three Months Ended |  |  | As of or For the Year Ended |
(dollars in thousands, except per share data, |  | December 31, |  |  | September 30, |  |  | December 31, |  |  | December 31, |  |  | December 31, |
ratios annualized, where applicable) |  | 2025 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Adjusted non-interest expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-interest expense |  | $ | 60,369 |  |  | $ | 60,518 |  |  | $ | 57,431 |  |  | $ | 236,918 |  |  | $ | 218,777 |
Less: Impairment charges on assets held for sale and ROU assets |  |  | 195 |  |  |  | — |  |  |  | — |  |  |  | 195 |  |  |  | 194 |
Less: Merger-related expenses |  |  | — |  |  |  | — |  |  |  | 218 |  |  |  | 5,087 |  |  |  | 629 |
Less: Secondary public offering of common stock expenses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 413 |  |  |  | — |
Less: Loss on extinguishment of debt |  |  | — |  |  |  | 843 |  |  |  | — |  |  |  | 843 |  |  |  | — |
Adjusted non-interest expense |  | $ | 60,174 |  |  | $ | 59,675 |  |  | $ | 57,213 |  |  | $ | 230,380 |  |  | $ | 217,954 |
Adjusted non-interest expense excluding amortization of intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted non-interest expense |  | $ | 60,174 |  |  | $ | 59,675 |  |  | $ | 57,213 |  |  | $ | 230,380 |  |  | $ | 217,954 |
Less: Amortization of intangible assets |  |  | 1,494 |  |  |  | 1,494 |  |  |  | 1,345 |  |  |  | 5,605 |  |  |  | 5,380 |
Adjusted non-interest expense excluding amortization of intangible assets |  | $ | 58,680 |  |  | $ | 58,181 |  |  | $ | 55,868 |  |  | $ | 224,775 |  |  | $ | 212,574 |
Pre-tax pre-provision net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income |  | $ | 46,934 |  |  | $ | 49,919 |  |  | $ | 40,364 |  |  | $ | 173,253 |  |  | $ | 161,079 |
Add: Provision for credit losses |  |  | 9,702 |  |  |  | 5,298 |  |  |  | 6,878 |  |  |  | 36,102 |  |  |  | 27,041 |
Pre-tax pre-provision net income |  | $ | 56,636 |  |  | $ | 55,217 |  |  | $ | 47,242 |  |  | $ | 209,355 |  |  | $ | 188,120 |
Adjusted pre-tax pre-provision net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax pre-provision net income |  | $ | 56,636 |  |  | $ | 55,217 |  |  | $ | 47,242 |  |  | $ | 209,355 |  |  | $ | 188,120 |
Add: Impairment charges on assets held for sale and ROU assets |  |  | 195 |  |  |  | — |  |  |  | — |  |  |  | 195 |  |  |  | 194 |
Add: Merger-related expenses |  |  | — |  |  |  | — |  |  |  | 218 |  |  |  | 5,087 |  |  |  | 629 |
Add: Secondary public offering of common stock expenses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 413 |  |  |  | — |
Add: Loss on extinguishment of debt |  |  | — |  |  |  | 843 |  |  |  | — |  |  |  | 843 |  |  |  | — |
Adjusted pre-tax pre-provision net income |  | $ | 56,831 |  |  | $ | 56,060 |  |  | $ | 47,460 |  |  | $ | 215,893 |  |  | $ | 188,943 |
Tax equivalent net interest income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income |  | $ | 101,255 |  |  | $ | 99,890 |  |  | $ | 88,524 |  |  | $ | 385,348 |  |  | $ | 348,046 |
Add: Tax-equivalent adjustment |  |  | 213 |  |  |  | 228 |  |  |  | 230 |  |  |  | 901 |  |  |  | 921 |
Net interest income, fully taxable equivalent |  | $ | 101,468 |  |  | $ | 100,118 |  |  | $ | 88,754 |  |  | $ | 386,249 |  |  | $ | 348,967 |
Total revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income |  | $ | 101,255 |  |  | $ | 99,890 |  |  | $ | 88,524 |  |  | $ | 385,348 |  |  | $ | 348,046 |
Add: Non-interest income |  |  | 15,750 |  |  |  | 15,845 |  |  |  | 16,149 |  |  |  | 60,925 |  |  | $ | 58,851 |
Total revenue |  | $ | 117,005 |  |  | $ | 115,735 |  |  | $ | 104,673 |  |  | $ | 446,273 |  |  | $ | 406,897 |
Tangible common stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity |  | $ | 1,267,906 |  |  | $ | 1,237,682 |  |  | $ | 1,091,497 |  |  | $ | 1,267,906 |  |  | $ | 1,091,497 |
Less: Goodwill and other intangibles |  |  | 200,520 |  |  |  | 202,014 |  |  |  | 198,098 |  |  |  | 200,520 |  |  |  | 198,098 |
Tangible common stockholders' equity |  | $ | 1,067,386 |  |  | $ | 1,035,668 |  |  | $ | 893,399 |  |  | $ | 1,067,386 |  |  | $ | 893,399 |
Tangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | $ | 9,652,676 |  |  | $ | 9,812,375 |  |  | $ | 9,496,529 |  |  | $ | 9,652,676 |  |  | $ | 9,496,529 |
Less: Goodwill and other intangibles |  |  | 200,520 |  |  |  | 202,014 |  |  |  | 198,098 |  |  |  | 200,520 |  |  |  | 198,098 |
Tangible assets |  | $ | 9,452,156 |  |  | $ | 9,610,361 |  |  | $ | 9,298,431 |  |  | $ | 9,452,156 |  |  | $ | 9,298,431 |
Average tangible common stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average total stockholders' equity |  | $ | 1,290,789 |  |  | $ | 1,208,290 |  |  | $ | 1,094,025 |  |  | $ | 1,197,476 |  |  | $ | 1,040,515 |
Less: Average goodwill and other intangibles |  |  | 201,251 |  |  |  | 202,723 |  |  |  | 198,697 |  |  |  | 201,328 |  |  |  | 200,740 |
Average tangible common stockholders' equity |  | $ | 1,089,538 |  |  | $ | 1,005,567 |  |  | $ | 895,328 |  |  | $ | 996,148 |  |  | $ | 839,775 |
Average tangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average total assets |  | $ | 9,683,103 |  |  | $ | 9,716,920 |  |  | $ | 9,201,635 |  |  | $ | 9,556,954 |  |  | $ | 9,187,342 |
Less: Average goodwill and other intangibles |  |  | 201,251 |  |  |  | 202,723 |  |  |  | 198,697 |  |  |  | 201,328 |  |  |  | 200,740 |
Average tangible assets |  | $ | 9,481,852 |  |  | $ | 9,514,197 |  |  | $ | 9,002,938 |  |  | $ | 9,355,626 |  |  | $ | 8,986,602 |
Tangible net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 34,521 |  |  | $ | 37,200 |  |  | $ | 30,320 |  |  | $ | 130,051 |  |  | $ | 120,759 |
Add: After-tax intangible asset amortization |  |  | 1,104 |  |  |  | 1,103 |  |  |  | 1,015 |  |  |  | 4,140 |  |  |  | 3,974 |
Tangible net income |  | $ | 35,625 |  |  | $ | 38,303 |  |  | $ | 31,335 |  |  | $ | 134,191 |  |  | $ | 124,733 |
Adjusted tangible net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible net income |  | $ | 35,625 |  |  | $ | 38,303 |  |  | $ | 31,335 |  |  | $ | 134,191 |  |  | $ | 124,733 |
Add: Impairment charges on assets held for sale and ROU assets |  |  | 195 |  |  |  | — |  |  |  | — |  |  |  | 195 |  |  |  | 194 |
Add: Merger-related expenses |  |  | — |  |  |  | — |  |  |  | 218 |  |  |  | 5,087 |  |  |  | 629 |
Add: Secondary public offering of common stock expenses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 413 |  |  |  | — |
Add: Loss on extinguishment of debt |  |  | — |  |  |  | 843 |  |  |  | — |  |  |  | 843 |  |  |  | — |
Add: Tax benefit on significant items |  |  | (50 | ) |  |  | (221 | ) |  |  | (1 | ) |  |  | (1,522 | ) |  |  | (85 | )
Adjusted tangible net income |  | $ | 35,770 |  |  | $ | 38,925 |  |  | $ | 31,552 |  |  | $ | 139,207 |  |  | $ | 125,471 |

Byline Bancorp, Inc.

Page 15 of 15

BYLINE BANCORP, INC. AND SUBSIDIARIES

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES (continued) (unaudited)

|  | As of or For the Three Months Ended |  |  | As of or For the Year Ended |
(dollars in thousands, except share and per share |  | December 31, |  |  | September 30, |  |  | December 31, |  |  | December 31, |  |  | December 31, |
data, ratios annualized, where applicable) |  | 2025 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Pre-tax pre-provision return on average assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax pre-provision net income |  | $ | 56,636 |  |  | $ | 55,217 |  |  | $ | 47,242 |  |  | $ | 209,355 |  |  | $ | 188,120 |
Average total assets |  |  | 9,683,103 |  |  |  | 9,716,920 |  |  |  | 9,201,635 |  |  |  | 9,556,954 |  |  |  | 9,187,342 |
Pre-tax pre-provision return on average assets |  |  | 2.32 | % |  |  | 2.25 | % |  |  | 2.04 | % |  |  | 2.19 | % |  |  | 2.05 | %
Adjusted pre-tax pre-provision return on average assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted pre-tax pre-provision net income |  | $ | 56,831 |  |  | $ | 56,060 |  |  | $ | 47,460 |  |  | $ | 215,893 |  |  | $ | 188,943 |
Average total assets |  |  | 9,683,103 |  |  |  | 9,716,920 |  |  |  | 9,201,635 |  |  |  | 9,556,954 |  |  |  | 9,187,342 |
Adjusted pre-tax pre-provision return on average assets |  |  | 2.33 | % |  |  | 2.29 | % |  |  | 2.05 | % |  |  | 2.26 | % |  |  | 2.06 | %
Net interest margin, fully taxable equivalent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income, fully taxable equivalent |  | $ | 101,468 |  |  | $ | 100,118 |  |  | $ | 88,754 |  |  | $ | 386,249 |  |  | $ | 348,967 |
Total average interest-earning assets |  |  | 9,230,799 |  |  |  | 9,288,078 |  |  |  | 8,785,176 |  |  |  | 9,130,196 |  |  |  | 8,774,014 |
Net interest margin, fully taxable equivalent |  |  | 4.36 | % |  |  | 4.28 | % |  |  | 4.02 | % |  |  | 4.23 | % |  |  | 3.98 | %
Non-interest income to total revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-interest income |  | $ | 15,750 |  |  | $ | 15,845 |  |  | $ | 16,149 |  |  | $ | 60,925 |  |  | $ | 58,851 |
Total revenues |  |  | 117,005 |  |  |  | 115,735 |  |  |  | 104,673 |  |  |  | 446,273 |  |  |  | 406,897 |
Non-interest income to total revenues |  |  | 13.46 | % |  |  | 13.69 | % |  |  | 15.43 | % |  |  | 13.65 | % |  |  | 14.46 | %
Adjusted non-interest expense to average assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted non-interest expense |  | $ | 60,174 |  |  | $ | 59,675 |  |  | $ | 57,213 |  |  | $ | 230,380 |  |  | $ | 217,954 |
Average total assets |  |  | 9,683,103 |  |  |  | 9,716,920 |  |  |  | 9,201,635 |  |  |  | 9,556,954 |  |  |  | 9,187,342 |
Adjusted non-interest expense to average assets |  |  | 2.47 | % |  |  | 2.44 | % |  |  | 2.47 | % |  |  | 2.41 | % |  |  | 2.37 | %
Adjusted efficiency ratio: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted non-interest expense excluding amortization of intangible assets |  | $ | 58,680 |  |  | $ | 58,181 |  |  | $ | 55,868 |  |  | $ | 224,775 |  |  | $ | 212,574 |
Total revenues |  |  | 117,005 |  |  |  | 115,735 |  |  |  | 104,673 |  |  |  | 446,273 |  |  |  | 406,897 |
Adjusted efficiency ratio |  |  | 50.15 | % |  |  | 50.27 | % |  |  | 53.37 | % |  |  | 50.37 | % |  |  | 52.24 | %
Adjusted return on average assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted net income |  | $ | 34,666 |  |  | $ | 37,822 |  |  | $ | 30,537 |  |  | $ | 135,067 |  |  | $ | 121,497 |
Average total assets |  |  | 9,683,103 |  |  |  | 9,716,920 |  |  |  | 9,201,635 |  |  |  | 9,556,954 |  |  |  | 9,187,342 |
Adjusted return on average assets |  |  | 1.42 | % |  |  | 1.54 | % |  |  | 1.32 | % |  |  | 1.41 | % |  |  | 1.32 | %
Adjusted return on average stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted net income |  | $ | 34,666 |  |  | $ | 37,822 |  |  | $ | 30,537 |  |  | $ | 135,067 |  |  | $ | 121,497 |
Average stockholders' equity |  |  | 1,290,789 |  |  |  | 1,208,290 |  |  |  | 1,094,025 |  |  |  | 1,197,476 |  |  |  | 1,040,515 |
Adjusted return on average stockholders' equity |  |  | 10.65 | % |  |  | 12.42 | % |  |  | 11.10 | % |  |  | 11.28 | % |  |  | 11.68 | %
Tangible common equity to tangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible common equity |  | $ | 1,067,386 |  |  | $ | 1,035,668 |  |  | $ | 893,399 |  |  | $ | 1,067,386 |  |  | $ | 893,399 |
Tangible assets |  |  | 9,452,156 |  |  |  | 9,610,361 |  |  |  | 9,298,431 |  |  |  | 9,452,156 |  |  |  | 9,298,431 |
Tangible common equity to tangible assets |  |  | 11.29 | % |  |  | 10.78 | % |  |  | 9.61 | % |  |  | 11.29 | % |  |  | 9.61 | %
Return on average tangible common stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible net income available to common stockholders |  | $ | 35,625 |  |  | $ | 38,303 |  |  | $ | 31,335 |  |  | $ | 134,191 |  |  | $ | 124,733 |
Average tangible common stockholders' equity |  |  | 1,089,538 |  |  |  | 1,005,567 |  |  |  | 895,328 |  |  |  | 996,148 |  |  |  | 839,775 |
Return on average tangible common stockholders' equity |  |  | 12.97 | % |  |  | 15.11 | % |  |  | 13.92 | % |  |  | 13.47 | % |  |  | 14.85 | %
Adjusted return on average tangible common stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted tangible net income available to common stockholders |  | $ | 35,770 |  |  | $ | 38,925 |  |  | $ | 31,552 |  |  | $ | 139,207 |  |  | $ | 125,471 |
Average tangible common stockholders' equity |  |  | 1,089,538 |  |  |  | 1,005,567 |  |  |  | 895,328 |  |  |  | 996,148 |  |  |  | 839,775 |
Adjusted return on average tangible common stockholders' equity |  |  | 13.02 | % |  |  | 15.36 | % |  |  | 14.02 | % |  |  | 13.97 | % |  |  | 14.94 | %
Tangible book value per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible common equity |  | $ | 1,067,386 |  |  | $ | 1,035,668 |  |  | $ | 893,399 |  |  | $ | 1,067,386 |  |  | $ | 893,399 |
Common shares outstanding |  |  | 45,545,928 |  |  |  | 45,859,977 |  |  |  | 44,459,584 |  |  |  | 45,545,928 |  |  |  | 44,459,584 |
Tangible book value per share |  | $ | 23.44 |  |  | $ | 22.58 |  |  | $ | 20.09 |  |  | $ | 23.44 |  |  | $ | 20.09 |