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Summary of Significant Accounting Policies (Policies) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Basis of Presentation | The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the U.S. (“U.S. GAAP”) and include the financial position, results of operations, comprehensive (loss) income, changes in equity and cash flows of Adtran and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Revision of Previously Issued Consolidated Financial Statements | Revision of Previously Issued Consolidated Financial Statements Following the third quarter of 2024, the Company identified errors primarily impacting the carrying values of the redeemable non-controlling interest, retained deficit, the net income attributable to the non-controlling interest and the net loss attributable to the Company and, as a consequence, of the loss per common share attributable to the Company. The Company has evaluated the errors and determined that the related impacts were not material to the previously issued consolidated financial statements for any prior period. A summary of the corrections to the Company's Consolidated Financial Statements for the periods ended March 31, 2023, June 30, 2023, September 30, 2023, December 31, 2023, March 31, 2024 and June 30, 2024, are as follows: (a) Pursuant to the terms of the DPLTA, each Adtran Networks shareholder (other than the Company) is entitled to receive from us an Annual Recurring Compensation payment of €0.52 per share. The Company erroneously accrued this liability every quarter at €0.59 per share, overstating the associated accrual, the net income attributable to non-controlling interest and the net loss attributable to ADTRAN Holdings, Inc. for fiscal periods beginning with the quarter ended March 31, 2023 through the quarter ended June 30, 2024. (b) For the periods beginning with the quarter ended March 31, 2023 through the quarter ended June 30, 2024 the Company remeasured the redeemable non-controlling interest each quarter-end at the current exchange rate of euros to U.S. Dollar. The Company treated the redeemable non-controlling interest as a monetary mezzanine equity instrument but should have treated it as a non-monetary mezzanine equity instrument not subject to remeasurement. The following tables reflect the impact of the revisions to the specific line items presented in the Company’s previously reported Consolidated Balance Sheet as of December 31, 2023, the Consolidated Statement of Loss and the Consolidated Statement of Comprehensive Loss for the year ended December 31, 2023.
|  |  | December 31, 2023 |
(In thousands) |  |  | As Previously Reported |  |  | Revision |  |  | As Revised |
Accrued Expenses and Other Liabilities |  |  | $ | 37,607 |  |  | $ | (1,403 | ) | (a) | $ | 36,204 |
Total Current Liabilities |  |  | $ | 279,511 |  |  | $ | (1,403 | ) |  | $ | 278,108 |
Total Liabilities |  |  | $ | 636,934 |  |  | $ | (1,403 | ) |  | $ | 635,531 |
Redeemable Non-Controlling Interest |  |  | $ | 451,756 |  |  | $ | (9,604 | ) | (b) | $ | 442,152 |
Accumulated Other Comprehensive Income |  |  | $ | 47,461 |  |  | $ | 4 |  | (a) | $ | 47,465 |
Retained Deficit |  |  | $ | (243,908 | ) |  | $ | 11,003 |  | (a)(b) | $ | (232,905 | )
Total Equity |  |  | $ | 593,822 |  |  | $ | 11,007 |  |  | $ | 604,829 |
Total Liabilities, Redeemable Non-Controlling Interest and Equity |  |  | $ | 1,682,512 |  |  | $ | — |  |  | $ | 1,682,512 |
|  |  | For the Year Ended December 31, 2023 |
(In thousands) |  |  | As Previously Reported |  |  | Revision |  |  | As Revised |
Less: Net Income attributable to non-controlling interest |  |  | $ | 8,345 |  |  | $ | (1,399 | ) | (a) | $ | 6,946 |
Net Loss attributable to ADTRAN Holdings, Inc. |  |  | $ | (267,688 | ) |  | $ | 1,399 |  | (a) | $ | (266,289 | )
Loss per common share attributable to ADTRAN Holdings, Inc. – basic |  |  | $ | (3.41 | ) |  | $ | 0.02 |  | (a) | $ | (3.39 | )
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted |  |  | $ | (3.41 | ) |  | $ | 0.02 |  | (a) | $ | (3.39 | )
Foreign currency translation gain |  |  | $ | 22,753 |  |  | $ | 4 |  | (a) | $ | 22,757 |
Other Comprehensive Income, net of tax |  |  | $ | 21,717 |  |  | $ | 4 |  |  | $ | 21,721 |
Comprehensive Loss, net of tax |  |  | $ | (237,626 | ) |  | $ | 4 |  |  | $ | (237,622 | )
Less: Comprehensive Income attributable to non-controlling interest, net of tax |  |  | $ | 8,727 |  |  | $ | (1,399 | ) | (a) | $ | 7,328 |
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax |  |  | $ | (246,353 | ) |  | $ | 1,403 |  | (a) | $ | (244,950 | )
Use of Estimates | Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Significant estimates include allowance for credit losses on accounts receivable and contract assets, excess and obsolete inventory reserves, warranty reserves, customer rebates, determination and accrual of the deferred revenue related to performance obligations under contracts with customers, estimated costs to complete obligations associated with deferred and accrued revenue and network installations, estimated income tax provision and income tax contingencies, fair value of stock-based compensation, assessment of goodwill and other intangibles for impairment, estimated lives of intangible assets, estimates of intangible assets upon measurement, estimated pension liability and fair value of investments and estimated contingent liabilities. Actual amounts could differ significantly from these estimates. We assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to us and the unknown future impacts of ongoing inflationary pressures, continued elevated interest rates, instability in the financial services industry, currency fluctuations and political tensions as of December 31, 2024, and through the date of this report. These conditions could result in further impacts to the Company's consolidated financial statements in future reporting periods. The accounting matters assessed included, but were not limited to, the allowance for credit losses, stock-based compensation, carrying value of goodwill, intangibles and other long-lived assets, financial assets, valuation allowances for tax as sets, revenue recognition and costs of revenue.
Cash and Cash Equivalents | Cash and Cash Equivalents Cash and cash equivalents represent demand deposits, money market funds and short-term investments classified as available-for-sale with original maturities of three months or less. We maintain depository investments with certain financial institutions. As of December 31, 2024 $74.0 million of our cash and cash equivalents, primarily certain domestic money market funds and foreign depository accounts, were in excess of government provided insured depository limits. Although these depository investments may exceed government insured depository limits, we have evaluated the credit worthiness of these applicable financial institutions and determined the risk of material financial loss due to the exposure of such credit risk to be minimal.
Fair Value of Financial Instruments | Fair Value of Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models may be applied. Assets and liabilities recorded at fair value in our consolidated balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair values. The carrying amounts reported in the Consolidated Balance Sheets for cash and cash equivalents, accounts receivable and accounts payable approximate fair value due to the immediate or short-term maturity of these financial instruments. The fair value measurements of our derivative instruments are determined using models that maximize the use of the observable market inputs including interest rate curves and both forward and spot prices for currencies, and are classified as Level II under the fair value hierarchy. The fair values of our derivatives are included in Note 10. Investments with contractual maturities beyond one year may be classified as short-term based on their highly liquid nature and because such marketable securities represent the investment of cash that is available for current operations. Despite the long-term nature of their stated contractual maturities, we routinely buy and sell these securities and we believe we have the ability to quickly sell them to the remarketing agent, tender agent or issuer at par value plus accrued interest in the event we decide to liquidate our investment in a particular variable rate demand note. All income generated from these investments is recorded as interest income. We have not recorded any losses relating to variable rate demand notes. Long-term investments is comprised of our deferred compensation plan assets, marketable equity securities and other equity investments. Marketable equity securities are reported at fair value as determined by the most recently traded price of the securities at the balance sheet date, although the securities may not be readily marketable due to the size of the available market. Any changes in fair value are recognized in net investment gain (loss). Realized gains and losses on sales of debt securities are computed under the specific identification method and are included in other income, net. See Note 4 for additional information.
Accounts Receivable | Accounts Receivable The Company records accounts receivable at amortized cost. Prior to establishing payment terms for a new customer, we evaluate the credit risk of the customer. Credit limits and payment terms established for new customers are re-evaluated periodically based on customer collection experience and other financial factors. As of December 31, 2024, no customer comprised more than 10% of our total accounts receivable balance. As of December 31, 2023, a single customer comprised more than 10% of our total accounts receivable balance, which accounted for 11.9% of our total accounts receivable. The Company regularly reviews the need for an allowance for credit losses related to our outstanding accounts receivable balances using the historical loss-rate method, as well as assessing asset-specific risks. The assessment of asset-specific risks included the evaluation of relevant available information, from internal and external sources, relating to current conditions that may affect a customer’s ability to pay, such as the customer’s current financial condition or credit rating by geographic location, as provided by a third party and/or by customer, if needed, and overall macro-economic conditions in which the customer operates. Based on this assessment, an allowance for credit losses would be recorded if the Company determined that, based on our historical write-offs, which have been immaterial, and such asset specific risks, there was risk in collectability of the full amount of any accounts receivable.
Accounts Receivable Factoring | Accounts Receivable Factoring Receivables Purchase Agreement On July 1, 2024, the Company entered into a receivables purchase agreement (the “Factoring Agreement”) with a third-party financial institution (the “Factor”), which accelerates receivable collection and helps to better manage cash flow. These transactions are accounted for in accordance with ASC Topic 860 and result in a reduction in accounts receivable because the Factoring Agreement transfers effective control over, and risk related to the receivables to the buyers. Trade accounts receivables balances sold are removed from the Consolidated Balance Sheets and cash received is reflected as cash flows provided by (used in) operating activities in the Consolidated Statements of Cash Flow. Factoring related interest expense is recorded to interest expense on the Consolidated Statements of Loss. On each sale date, the Factor retains from the sale price a default reserve, up to a required balance, which is held by the Factor in a reserve account and pledged to the Company. The Factor is entitled to withdraw from the reserve account the sale price of a defaulted receivable. The balance in the reserve account is included in other assets on the Consolidated Balance Sheets. Previous Receivables Purchase Agreement On December 19, 2023, the Company entered into a factoring agreement with a third-party financial institution to sell, on a revolving basis, undivided interests in the Company’s accounts receivable. The factoring agreement qualified for treatment as a secured borrowing with a pledge of collateral under Accounting Standards Codification ("ASC") Topic 810, Consolidations, as the Company was considered the primary beneficiary in a variable interest entity created to hold the factored receivables and the Company retained a residual claim on reserves related to the factored receivables. The receivables factored were carried in accounts receivable, less allowance for credit losses on the Consolidated Balance Sheets, the secured borrowings were carried on the Company’s Consolidated Balance Sheets as a current liability, in accounts payable, proceeds and repayments of the secured borrowings are reflected as cash flows (used in) provided by financing activities in the Consolidated Statements of Cash Flows and program fees are recorded in interest expense in the Company’s Consolidated Statements of Loss. The short-term liability classification of the secured borrowings was based on the estimated timing of the collection of the accounts receivable which were expected to be received within 12 months. The receivables purchase agreement was terminated on July 1, 2024 and there were no secured borrowings under this agreement as of December 31, 2024. See Note 2 for additional information.
Inventory | Inventory Inventory is carried at the lower of cost and estimated net realizable value, with cost being determined using the first-in, first-out method. Standard costs for material, labor and manufacturing overhead are used to value inventory and are updated at least quarterly. We establish reserves for estimated excess and obsolete inventory equal to the difference between the cost of the inventory and the estimated net realizable value of the inventory based on estimated reserve percentages, which consider historical usage, known trends, inventory age and market conditions. When we dispose of excess and obsolete inventories, the related disposals are charged against the inventory reserve. See Note 5 for additional information.
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment, which is stated at cost, is depreciated using the straight-line method over the estimated useful lives of the assets. We depreciate building and land improvements from 5 to 39 years, office machinery and equipment from three to seven years, engineering machinery and equipment from three to seven years, and computer software from three to five years. Expenditures for repairs and maintenance are charged to expense as incurred. Major improvements that materially prolong the lives of the assets are capitalized. Gains and losses on the disposal of property, plant and equipment are recorded in operating loss. See Note 6 for additional information.
Assets Held for Sale | Assets Held for Sale An asset is considered to be held for sale when all the following criteria are met: (i) management commits to a plan to sell the asset; (ii) the asset is available for immediate sale in its present condition; (iii) actions required to complete the sale of the asset have been initiated; (iv) sale of the asset is probable and the completed sale is expected to occur within one year; (v) it is unlikely that the disposal plan will be significantly modified; and (vi) the asset is actively being marketed for sale at a price that is reasonable given its current market value. The Company records assets held for sale at the lower of their carrying value or fair value. The total carrying value of assets held for sale was $11.9 million as of December 31, 2024 and is separately recorded on the balance sheet.
Intangible Assets | Intangible Assets Purchased intangible assets with finite lives are carried at cost less accumulated amortization. Amortization is recorded over the estimated useful lives of the respective assets. See Note 9 for additional information. Impairment of Long-Lived Assets and Intangibles Long-lived assets, such as property, plant and equipment, right of use lease assets and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset or asset group. During the first quarter of 2024, factors triggered a quantitative impairment assessment for the Network Solutions asset group. The long-lived assets associated with the Network Solutions asset group was approximately $358.6 million as of December 31, 2024 There were no impairment losses for long-lived assets and intangible assets during the years ended December 31, 2024, 2023 and 2022. See Note 9 for additional information.
Goodwill | Goodwill Goodwill represents the excess purchase price over the fair value of net assets acquired. The Company’s annual impairment assessment is done at the reporting unit level, which we determined are generally the same as our operating segments, which are identified in Note 16 to the Consolidated Financial Statements. We review goodwill for impairment annually during the fourth quarter and also test for impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of our reporting units below their carrying amount. Such events and circumstances may include among others: a significant adverse change in legal factors or in the general business climate; significant decline in our stock price and market capitalization; unanticipated competition; the testing for recoverability of a significant asset within the reporting unit; and an adverse action or assessment by a regulator. Any adverse change in these factors could have a significant impact on the recoverability of goodwill and could have a material impact on our consolidated financial statements. The Company’s annual impairment test date is October 1, 2024. Based on our analysis, management concluded that there was no impairment of goodwill as of that date. Between the annual impairment date of October 1, 2024 and year-end December 31, 2024, there were no additional triggering events. The Company recognized impairments of $292.6 million and $37.9 million during the years ended December 31, 2024 and 2023, respectively. No goodwill impairment charge was recorded during the year ended December 31, 2022. See Note 8 for additional information.
Other Non-Current Assets | Other Non-Current Assets Implementation costs incurred for hosting arrangements that are related to service contracts are capitalized and amortized over the term of the arrangement. Capitalized implementation costs totaled $0.1 million and $0.3 million as of December 31, 2024 and 2023, respectively, and are included in other non-current assets on the Consolidated Balance Sheets. In connection with the planned integration of information technology following the Business Combination, we determined that certain projects no longer fit our needs. The Company recognized impairment charges of $16.9 million during the year ended December 31, 2022 primarily related to capitalized implementation costs for a cloud computing arrangement. The impairment charges were determined based on actual costs incurred. During the year ended December 31, 2024 and 20 23, no impairment charges were recognized. We depreciate capitalized implementation costs over various lives. Amortization expense was $0.1 million, $5.9 million and $3.9 million for the years ended December 31, 2024, 2023 and 2022, respectively, which is recorded almost entirely in selling, general and a dministrative expenses in the Consolidated Statements of Loss.
Pension Benefit Plan Obligations | Pension Benefit Plan Obligations The Company maintains a defined benefit pension plans covering employees in certain foreign countries. Pension benefit plan obligations are based on various assumptions used by our actuaries in calculating these amounts. These assumptions include discount rates, compensation rate increases, expected return on plan assets, retirement rates and mortality rates. Actual results that differ from the assumptions and changes in assumptions could affect future expenses and obligations. See Note 13 for additional information.
Lease Obligations | Lease Obligations The Company has operating leases for office space, automobiles and various other equipment in the U.S. and in certain international locations. Other contracts, such as manufacturing agreements and service agreements, are reviewed to determine if they contain potential embedded leases. These other contracts are specifically reviewed to determine whether we have the right to substantially all of the economic benefit from the use of any specified assets or the right to direct the use of any specified assets, either of which would indicate the existence of a lease. Some of our leases include options to renew. For those leases that are reasonably assured to be renewed, we have included the option to extend as part of our right of use asset and lease liability. The exercise of lease renewal options is at our sole discretion. The depreciable life of leased assets and leasehold improvements are limited by the expected lease term. Leases with an initial term of 12 months or less are not recorded on the balance sheet and lease expense for these leases is recognized on a straight-line basis over the lease term. For lease agreements entered into or reassessed after the adoption of Topic 842, we elected to not separate lease and non-lease components. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants.
Stock-Based Compensation | Stock-Based Compensation The Company has two stock incentive plans from which stock options, performance stock units (“PSUs”), restricted stock units (“RSUs”) and restricted stock are available for grant to employees and directors. Costs related to these awards are recognized over their vesting periods. Stock-based compensation expense recognized for the years ended December 31, 2024, 2023 and 2022 was approximately $15.3 million, $16.0 million and $28.3 million, respectively. See Note 3 for additional information.
Research and Development Costs | Research and Development Costs Research and development costs include compensation for engineers and support personnel, contracted services, depreciation and material costs associated with new product development, enhancement of current products and product cost reductions. We continually evaluate new product opportunities and engage in intensive research for product and software develop ment efforts. Research and development costs totaled $221.5 million, $258.3 million and $173.8 million for the years ended December 31, 2024, 2023 and 2022, respectively. Adtran Networks has arrangements with governmental entities for the purposes of obtaining funding for research and development activities. The Company classifies government grants received under these arrangements as a reduction to research and development expense incurred. For the years ended December 31, 2024, 2023 and 2022, the Company recognized $9.2 million, $5.2 million and $1.1 million, respectively, as a reduction of research and development expense.
Income Taxes | Income Taxes The provision for income taxes has been determined using the asset and liability approach of accounting for income taxes. Under this approach, deferred taxes represent the future tax consequences expected to occur when the reported amounts of assets and liabilities are recovered or paid. The provision for income taxes represents income taxes paid or payable for the current year plus the change in deferred taxes during the year. Deferred taxes result from the difference between financial and tax basis of our assets and liabilities and are adjusted for changes in tax rates and tax laws when such changes are enacted. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. In determining whether an uncertain tax position exists, the Company determines, based solely on its technical merits, whether the tax position is more likely than not to be sustained upon examination, and if so, a tax benefit is measured on a cumulative probability basis that is more likely than not to be realized upon the ultimate settlement. The Company recognizes interest and penalties related to unrecognized tax benefits through interest expense and income tax expense, respectively.
Foreign Currency | Foreign Currency Transactions with customers that are denominated in foreign currencies are recorded using the appropriate exchange rates from throughout the year. Assets and liabilities denominated in foreign currencies are remeasured at the balance sheet dates using the closing rates of exchange between those foreign currencies and the functional currency with any transaction gains or losses reported in other income, net. Our primary exposures to foreign currency exchange rate movements are with our German and United Kingdom subsidiaries, whose functional currencies are the euro and the British pound sterling. Adjustments resulting from translating financial statements of international subsidiaries are recorded as a component of accumulated other comprehensive income.
Revenue | Revenue Revenue is measured based on the consideration expected to be received in exchange for transferring goods or providing services to a customer and as performance obligations under the terms of the contract are satisfied. Generally, this occurs with the transfer of control of a product to the customer. For transactions where there are multiple performance obligations, individual products and services are accounted for separately if they are distinct (if a product or service is separately identifiable from other items and if a customer can benefit from it on its own or with other resources that are readily available to the customer). The consideration, including any discounts, is allocated between separate products and services based on their stand-alone selling prices. Stand-alone selling prices are determined based on the prices at which the separate products and services are sold and are allocated based on each item’s relative value to the total value of the products and services in the arrangement. For items that are not sold separately, we estimate stand-alone selling prices primarily using the “expected cost plus a margin” approach. Payment terms are generally 30 days in the U.S. and typically longer in many geographic markets outside the U.S. Shipping fees collected are recorded as revenue and the related cost is included in cost of revenue. Revenue, value-added and other taxes collected concurrently with revenue-producing activities are excluded from revenue. Incremental costs of obtaining a contract, that are recoverable, are capitalized and amortized over the period that the related revenue is recognized if greater than one year. We have elected to account for shipping fees paid as a cost of fulfilling the related contract. We have also elected to apply the practical expedient related to the incremental costs of obtaining contracts and recognize those costs as an expense when incurred if the amortization period of the assets is one year or less. These costs are included in selling, general and administrative expenses. Capitalized costs with an amortization period greater than one year were immaterial. Revenue is generated by two reportable segments: Network Solutions and Services & Support. Network Solutions Segment - Includes hardware products and software defined next-generation virtualized solutions used in Service Provider or business networks, as well as prior generation products. The majority of the revenue from this segment is from hardware revenue. Hardware and Software Revenue Revenue from hardware sales is recognized when control is transferred to the customer, which is generally when the products are shipped. Shipping terms are generally FOB shipping point. Revenue from software license sales is recognized at delivery and transfer of control to the customer. Revenue is recognized net of estimated discounts and rebates using historical trends. Customers are typically invoiced when control is transferred and revenue is recognized. Our products generally include assurance-based warranties of 90 days to five years for product defects, which are accrued at the time products are delivered. Services & Support Segment - Includes a complete portfolio of maintenance, network implementation and solutions integration and managed services, which include hosted cloud services and subscription services to complement our Network Solutions segment. Maintenance Revenue Our maintenance service periods range from one month to five years. Customers are typically invoiced and pay for maintenance services at the beginning of the maintenance period. We recognize revenue for maintenance services on a straight-line basis over the maintenance period as our customers benefit evenly throughout the contract term and deferred revenue, when applicable, are recorded in current and non-current unearned revenue. Network Implementation Revenue The Company recognizes revenue for network implementation, which primarily consists of engineering, execution and enablement services at a point in time when each performance obligation is complete. If we have recognized revenue but have not billed the customer, the right to consideration is recognized as a contract asset that is included in other receivables on the Consolidated Balance Sheet. The contract asset is transferred to accounts receivable when the completed performance obligation is invoiced to the customer. See Notes 2 and 16 for additional information on reportable segments.
Unearned Revenue | Unearned Revenue Unearned revenue primarily represents customer billings on maintenance service programs and unearned revenue related to multiple element contracts where we still have contractual obligations to our customers. We currently offer maintenance contracts ranging from one month to five years. Revenue attributable to maintenance contracts is recognized on a straight-line basis over the related contract term. In addition, we provide software maintenance and a variety of hardware maintenance services to customers under contracts with terms up to ten years. When we defer revenue related to multiple performance obligations where we still have contractual obligations, we also defer the related costs. Current deferred costs are included in prepaid expenses and other current assets on the accompanying Consolidated Balance Sheets and totaled $2.2 million and $2.1 million as of December 31, 2024 and 2023, respectively. Non-current deferred costs included in other non-current assets on the accompanying Consolidated Balance Sheets were less than $0.1 million as of December 31, 2024 and December 31, 2023.
Redeemable Non-Controlling Interest | Redeemable Non-Controlling Interest As of December 31, 2024 and 2023, the non-controlling Adtran Networks stockholders’ equity ownership percentage in Adtran Networks was approximately 33.0% and 34.7%, respectively. As a result of the effectiveness of the DPLTA on January 16, 2023, the Adtran Networks shares, representing the equity interest in Adtran Networks held by holders other than the Company, can be tendered at any time and are, therefore, redeemable and must be classified outside stockholders’ equity. Therefore, the permanent equity noncontrolling interest balance was reclassified to redeemable non-controlling interest (RNCI) on January 16, 2023 and was remeasured to fair value based on the trading market price of the Adtran Networks shares. Subsequently, the carrying value of the RNCI is adjusted to its maximum redemption value at each reporting date when the maximum redemption value is greater than the initial carrying amount of the RNCI. For the period of time that the DPLTA is in effect, the RNCI will continue to be presented as RNCI outside of stockholders’ equity in the Consolidated Balance Sheets. See Note 15 for additional information on RNCI.
Loss per Share | Loss per Share Loss per common share and loss per common share assuming dilution are based on the weighted average number of common shares and, when dilutive, common equivalent shares outstanding during the year. See Note 19 for additional information. Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $3.0 million effect of redemption of RNCI for the year ended December 31, 2024. See Note 19 for additional information.
Recent Accounting Pronouncements Not Yet Adopted | Recent Accounting Pronouncements Not Yet Adopted In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, as amended by ASU 2025-01, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, which applies to all public business entities and is intended to enhance disclosures about specific types of expenses included in the expense captions presented on the face of the income statement as well as disclosures about selling expenses. The amendments are effective prospectively in the first annual period beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption and retrospective application are permitted. The Company is currently evaluating the effect that adoption of ASU 2024-03 will have on our disclosures. In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures", which is intended to enhance the transparency, decision usefulness and effectiveness of income tax disclosures. The amendments in this ASU require a public entity to disclose a tabular tax rate reconciliation, using both percentages and currency, with specific categories. A public entity is also required to provide a qualitative description of the states and local jurisdictions that make up the majority of the effect of the state and local income tax category and the net amount of income taxes paid, disaggregated by federal, state and foreign taxes and also disaggregated by individual jurisdictions. The amendments also remove certain disclosures that are no longer considered cost beneficial. The amendments are effective prospectively for annual periods beginning after December 15, 2024, and early adoption and retrospective application are permitted. The Company is currently evaluating the effect that adoption of ASU 2023-09 will have on our disclosures.
Recently Adopted Accounting Pronouncements | Recently Adopted Accounting Pronouncements In November 2023, the FASB issued ASU 2023-7, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures", which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, allowing financial statement users to better understand the components of a segment's profit or loss to assess potential future cash flows for each reportable segment and the entity as a whole. The amendments expand a public entity's segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker ("CODM"), clarifying when an entity may report one or more additional measures to assess segment performance, requiring enhanced interim disclosures, providing new disclosure requirements for entities with a single reportable segment, and requiring other new disclosures. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company adopted the new standard on January 1, 2024. The adoption of this standard resulted in additional footnote disclosures. The adoption of this standard did not have a material impact on our Consolidated Balance Sheet, Consolidated Statement of Income or Consolidated Statement of Cash Flows. See Note 16 for additional information. There have been no other recently adopted accounting pronouncements that are expected to have a material effect on the Consolidated Financial Statements.
Reclassification of Prior Year Presentation | Reclassification of Prior Year Presentation Certain prior year amounts have been reclassified for consistency with current year presentation. These reclassifications had no effect on reported results of operations. An adjustment has been made to the Consolidated Balance Sheet and Consolidated Statement of Cash Flows for the fiscal year ended December 31, 2023, to reclassify between Property, Plant and Equipment and Intangible Assets.

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