# EDGAR Filing Document

**Accession Number:** 0000926282
**File Stem:** 0001193125-26-205276
**Filing Date:** 2026-5
**Character Count:** 236451
**Document Hash:** 17589743ed5e914b7567c1293709ec88
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-205276.hdr.sgml**: 20260505

**ACCESSION NUMBER**: 0001193125-26-205276

**CONFORMED SUBMISSION TYPE**: 10-Q

**PUBLIC DOCUMENT COUNT**: 96

**CONFORMED PERIOD OF REPORT**: 20260331

**FILED AS OF DATE**: 20260505

**DATE AS OF CHANGE**: 20260505

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ADTRAN Holdings, Inc.
- **CENTRAL INDEX KEY:** 0000926282
- **STANDARD INDUSTRIAL CLASSIFICATION:** TELEPHONE & TELEGRAPH APPARATUS [3661]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 872164282
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 10-Q
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41446
- **FILM NUMBER:** 26940817

**BUSINESS ADDRESS:**
- **STREET 1:** 901 EXPLORER BLVD
- **CITY:** HUNTSVILLE
- **STATE:** AL
- **ZIP:** 35806
- **BUSINESS PHONE:** 256-963-8220

**MAIL ADDRESS:**
- **STREET 1:** 901 EXPLORER BLVD
- **CITY:** HUNTSVILLE
- **STATE:** AL
- **ZIP:** 35806

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ADTRAN INC
- **DATE OF NAME CHANGE:** 19940705

?xml version='1.0' encoding='ASCII'? 10-Q

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**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, DC 20549**

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**FORM** 10-Q

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**(Mark One)**

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

**For the quarterly period ended** **March 31,** 2026

**OR**

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

**For the transition period from _______ to _______**

**Commission File Number:** 001-41446

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ADTRAN Holdings, Inc.

**(Exact Name of Registrant as Specified in its Charter)** 

------

---

| | |
|:---|:---|
| Delaware | 87-2164282 |
| **(State or other jurisdiction of**<br>**incorporation or organization)** | **(I.R.S. Employer<br>Identification No.)** |
| <br>901 Explorer Boulevard<br>Huntsville**,** Alabama | 35806-2807 |
| **(Address of principal executive offices)** | **(Zip Code)** |

---

**Registrant's telephone number, including area code: (**256**)** 963-8000

<u>Securities registered pursuant to Section 12(b) of the Act:</u>

---

| | | |
|:---|:---|:---|
| **Title of each class** | <br>**Trading**<br>**Symbol(s)** | **Name of each exchange on which registered** |
| Common Stock, Par Value $0.01 per share | ADTN | The NASDAQ Global Select Market |

---

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

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

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

---

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

---

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

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

As of May 1, 2026, the registrant had 80,998,100 shares of common stock, $0.01 par value per share, outstanding.

------

**ADTRAN Holdings, Inc.**

**Quarterly Report on Form 10-Q**

**For the three months ended March 31, 2026**

**<u>**Table of Contents**</u>**

---

| | | |
|:---|:---|:---|
| **Item**<br>**Number** |  | **Page**<br>**Number** |
|  | [<u>Glossary of Selected Terms</u>](#glossary) | 3 |
|  | [<u>General</u>](#cuationary_note) | 4 |
|  | [<u>Cautionary Note Regarding Forward-Looking Statements</u>](#cuationary_note) | 4 |
|  | [**<u>PART I. FINANCIAL INFORMATION</u>**](#part_i_financial_information) |  |
| 1 | [<u>Financial Statements:</u>](#item_1_financial_statements) |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Condensed Consolidated Balance Sheets as of March 31, 2026 and December 31, 2025 - (Unaudited)</u>](#consolidated_statements_balance_sheet) | 7 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Condensed Consolidated Statements of Loss for the three months ended March 31, 2026 and 2025 – (Unaudited)</u>](#condensed_consolidated_statements_income) | 8 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Condensed Consolidated Statements of Comprehensive (Loss) Income for the three months ended March 31, 2026 and 2025 – (Unaudited)</u>](#consolidated_statements_comprehensive_in) | 9 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Condensed Consolidated Statements of Changes in Equity for the three months ended March 31, 2026 and 2025 (Unaudited)</u>](#condensed_consolidated_statements_change) | 10 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2026 and 2025 – (Unaudited)</u>](#condensed_consolidated_statements_cash_f) | 12 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Notes to Condensed Consolidated Financial Statements – (Unaudited)</u>](#notes_to_consolidated_financial_statemen) | 13 |
| 2 | [<u>Management's Discussion and Analysis of Financial Condition and Results of Operations</u>](#item_2_managements_discussion_analysis_f) | 31 |
| 3 | [<u>Quantitative and Qualitative Disclosures About Market Risk</u>](#item_3_quantitative_qualitative_disclosu) | 46 |
| 4 | [<u>Controls and Procedures</u>](#item_4_controls_procedures) | 47 |
|  | [**<u>PART II. OTHER INFORMATION</u>**](#part_ii_or_information) |  |
| 1 | [<u>Legal Proceedings</u>](#item_1_legal_proceedings) | 48 |
| 1A | [<u>Risk Factors</u>](#item_1a_risk_factors) | 48 |
| 2 | [<u>Unregistered Sales of Equity Securities and Use of Proceeds</u>](#item_2_unregistered_sales_equity_securit) | 48 |
| 5 | [<u>Other Information</u>](#item_five) | 48 |
| 6 | [<u>Exhibits</u>](#item_6__exhibits) | 48 |
|  | [**<u>SIGNATURE</u>**](#signature) | 50 |

---

------

**<u>GLOSSARY OF SELECTED TERMS</u>**

Below are certain acronyms, concepts and defined terms commonly used in our industry and in this Quarterly Report on Form 10-Q, along with their meanings:

---

| | |
|:---|:---|
| **Acronym/Concept/** |  |
| **Defined Term** | **Meaning** |
| AI | Artificial intelligence |
| Adtran Networks | Adtran Networks SE, a European stock corporation incorporated under the laws of the EU and Germany, and a majority-owned subsidiary of the Company |
| DPLTA | Domination and Profit and Loss Transfer Agreement |
| DSO | Days Sales Outstanding |
| GDPR | General Data Protection Regulation |
| MSO | Multiple System Operator |
| ODM | Original Design Manufacturing |
| RNCI | Redeemable Non-Controlling Interest |
| SaaS | Software as a Service |
| SEC | Securities and Exchange Commission |
| Service Provider | Entity that provides voice, data or video services to consumers and businesses |
| SMB | Small and Mid-Sized Business |
| SOFR | Secured Overnight Financing Rate |
| U.S. | United States of America |

---

------

**GENERAL**

Unless the context otherwise indicates or requires, references in this Quarterly Report on Form 10-Q to "Adtran," the "Company," "we", "us" and "our" refer to ADTRAN Holdings, Inc. and its consolidated subsidiaries.

**CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS** 

The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by or on behalf of Adtran. Adtran and its representatives may from time to time make written or oral forward-looking statements, including statements contained in this report, our other filings with the SEC and other communications with our stockholders. Any statement that does not directly relate to a historical or current fact is a forward-looking statement. Generally, the words "believe", "expect", "intend", "estimate", "anticipate", "would", "will", "may", "might", "could", "should", "can", "future", "assume", "plan", "seek", "predict", "potential", "objective", "expect", "target", "project", "outlook", "forecast" and similar expressions identify forward-looking statements. We caution you that any forward-looking statements made by us or on our behalf are subject to uncertainties and other factors that could affect the accuracy of such statements. Forward-looking statements are based on management's current expectations, as well as certain assumptions and estimates made by, and information available to, management at the time the statements are made. Those statements are based on general assumptions and are subject to various risks, and because they also relate to the future, they are likewise subject to inherent uncertainties and other factors that may cause actual results to differ materially from the views, beliefs and projections expressed in such statements. The following are some of the risks that could affect our financial performance or could cause actual results to differ materially from those expressed or implied in our forward-looking statements:

***Risks related to our financial results and Company success***

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We are obligated to comply with covenants related to our Wells Fargo Credit Agreement that restrict our operating activities, and the failure to comply with such covenants could result in defaults that accelerate our debt obligations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We have experienced significant fluctuations in revenue and such fluctuations may continue. Fluctuations in revenue can cause our operating results in a given reporting period to be higher or lower than expected.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Accurately matching necessary inventory levels to customer demand is challenging, and we may incur additional costs or be required to write off significant inventory that could adversely impact our results of operations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•The lengthy sales and approval process required by Service Providers for new products has resulted in fluctuations in our revenue and may result in future revenue fluctuations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We require a significant amount of cash to service our indebtedness, our payment obligations to Adtran Networks shareholders under the DPLTA, and other obligations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•The terms of the DPLTA may have a material adverse effect on our financial results and condition.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our significant indebtedness exposes us to various risks.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We depend heavily on sales to certain customers; the loss of any of these customers or a significant project would significantly reduce our revenue and net income.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our exposure to the credit risks of our customers and distributors may make it difficult to collect accounts receivable and could adversely affect our operating results, financial condition and cash flows.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We expect gross margins to continue to vary over time, and our levels of product and services gross margins may not be sustainable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our dependence on a limited number of suppliers for certain raw materials, key components and ODM products, combined with supply shortages, has prevented and may continue to prevent us from delivering our products on a timely basis, which has had and may continue to have a material adverse effect on operating results and could have a material adverse effect on customer relations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We compete in markets that have become increasingly competitive, which may result in reduced gross profit margins and market share.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our estimates regarding future warranty obligations may change due to product failure rates, installation and shipment volumes, field service repair obligations and other rework costs incurred in correcting product failures. If our estimates materially change, our liability for warranty obligations may increase or decrease, impacting future cost of revenue.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Managing our inventory is complex and has included and may continue to include write downs of excess or obsolete inventory.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our international operations have and may continue to expose us to additional risks, increase our costs and adversely affect our operating results, financial condition and cash flows. (including risks relating to the recent escalation and broadening of the conflict involving the United States, Iran, Israel, and Lebanon)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our success depends on attracting and retaining key personnel.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We are exposed to currency exchange rate fluctuations in jurisdictions where we transact in local currency, which could harm our financial results and cash flows.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We have recognized impairment charges related to goodwill and other intangible assets in the past and may be required to do so in the future.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We may be unable to successfully and effectively manage and integrate acquisitions, divestitures and other significant transactions, which could harm our operating results, business and prospects.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Ongoing inflationary pressures have negatively impacted our revenue and profitability.

***Risks related to our control environment***

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We have had to restate our previously issued consolidated financial statements and, as part of that process, have identified material weaknesses in our internal control over financial reporting. If we are unable to develop and maintain effective internal control over financial reporting, we may not be able to accurately report our financial results in a timely manner, which may adversely affect investor confidence in us and may adversely affect our business, financial condition and results of operations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We may face litigation and other risks as a result of our material weaknesses in our internal control over financial reporting and any resulting restatement of our previously issued financial statements.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Breaches of our information systems and cyberattacks could compromise our intellectual property and cause significant damage to our business and reputation.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Emerging issues related to the development and use of AI could give rise to legal or regulatory action, damage our reputation, or otherwise materially harm our business.

***Risks related to the telecommunications industry***

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We must continue to update and improve our products and develop new products to compete and to keep pace with improvements in communications technology.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our failure or the failure of our contract manufacturers to comply with applicable environmental regulations could adversely impact our results of operations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•If our products do not interoperate with our customers' networks, installations may be delayed or canceled, which could harm our business.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We engage in research and development activities to develop new, innovative solutions and to improve the application of developed technologies, and as a consequence may miss certain market opportunities enjoyed by larger companies with substantially greater research and development efforts and which may focus on more leading-edge development.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our strategy of outsourcing a portion of our manufacturing requirements to subcontractors located in various international regions may result in us not meeting our cost, quality or performance standards.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our failure to maintain rights to intellectual property used in our business could adversely affect the development, functionality and commercial value of our products.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Third party hardware or software that is used with our portfolios may not continue to be available or at commercially reasonable terms.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our use of open source software could impose limitations on our ability to commercialize our products.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We may incur liabilities or become subject to litigation that would have a material effect on our business.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•If we are unable to successfully develop and maintain relationships with System Integrators, Service Providers and enterprise value-added resellers, our revenue may be negatively affected.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We depend on a third-party cloud platform provider to host our Mosaic One SaaS network and other operating platforms, and if we were to experience a material disruption or interference in service, our business and reputation could suffer.

------

***Risks related to the Company's stock price***

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our financial performance and operating results historically have fluctuated and could fluctuate in future periods, which has affected and may in the future affect our stock price.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Future issuances of additional equity securities could result in dilution of existing stockholders' equity ownership.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•The price of our common stock has been volatile and may continue to fluctuate significantly.

***Risks related to our Convertible Senior Notes (the "2030 Notes" or the "Notes") and Capped Call Transactions (the "Capped Calls")***

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Our indebtedness and liabilities could limit the cash flow available for our operations and expose us to risks that could adversely affect our business, financial condition and results of operations. In addition, if we are unable to raise additional capital and/or restructure some of our existing indebtedness, we may be unable to meet our obligations as they come due, including with respect to the 2030 Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We may be unable to raise the funds necessary to repurchase the 2030 Notes for cash following a fundamental change or to pay any cash amounts due upon maturity or conversion of the 2030 Notes, and our other indebtedness may limit our ability to repurchase the 2030 Notes or to pay any cash amounts due upon their maturity or conversion.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Provisions in the Indenture (as defined below) could delay or prevent an otherwise beneficial takeover of us.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•The accounting method for the 2030 Notes has affected and may continue to adversely affect our reported financial condition and results.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Transactions relating to our 2030 Notes may affect the value of our common stock.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We are subject to counterparty risk with respect to the Capped Calls, and the Capped Calls may not operate as planned.

***Risks related to the regulatory environments in which we do business***

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•We are subject to complex and evolving U.S. and foreign laws, regulations and standards governing the conduct of our business. Violations of these laws and regulations may harm our business, subject us to penalties and to other adverse consequences.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Changes in trade policy in the U.S. and other countries, including the imposition of additional tariffs and the resulting consequences, may adversely impact our gross profits, gross margins, results of operations and financial condition.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•New or revised tax regulations, changes in our effective tax rate, recognition of a valuation allowance or assessments arising from tax audits may have an adverse impact on our results.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Interest rate fluctuations could increase our costs of borrowing money and negatively impact our financial condition and future operations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Expectations relating to sustainability and governance matters expose the Company to potential liabilities, increased costs, reputational harm, and other adverse effects on the Company's business.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Further downgrades of the U.S. credit rating, automatic spending cuts, the recent government shutdown or future government shutdown could negatively impact our liquidity, financial condition and earnings.

The foregoing list of risks is not exclusive. For a more detailed description of the risk factors associated with our business, see Part I, Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on February 26, 2026 (the "2025 Form 10-K"), as well as the risk factors set forth in Part II, Item 1A of this Quarterly Report on Form 10-Q. We caution investors that other factors may prove to be important in the future in affecting our operating results. New factors emerge from time to time, and it is not possible for us to predict all of these factors, nor can we assess the impact each factor, or a combination of factors, may have on our business.

You are further cautioned not to place undue reliance on these forward-looking statements because they speak only of our views as of the date that the statements were made. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

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**PART I. FINANCIAL INFORMATION**

**<u>ITEM 1. FINANCIAL STATEMENTS</u>**

**ADTRAN Holdings, Inc.**

**CONDENSED CONSOLIDATED BALANCE SHEETS**

**(Unaudited)**

 **(In thousands, except per share amounts)**

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| | | |
|:---|:---|:---|
|  | **March 31,** | **December 31,** |
|  | **2026** | **2025** |
| **ASSETS** |  |  |
| **Current Assets** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Cash and cash equivalents | $88270 | $95696 |
| &nbsp;&nbsp;&nbsp;Accounts receivable, less allowance for credit losses of $1,652 and $1,318 as of March 31, 2026<br> and December 31, 2025, respectively | 215473 | 210687 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other receivables | 10292 | 7046 |
| &nbsp;&nbsp;&nbsp;&nbsp;Inventory, net | 209003 | 215736 |
| &nbsp;&nbsp;&nbsp;&nbsp;Income tax receivable | 2971 | 3667 |
| &nbsp;&nbsp;&nbsp;&nbsp;Prepaid expenses and other current assets | 62492 | 55317 |
| &nbsp;&nbsp;&nbsp;&nbsp;Short-term investments - deferred compensation | 33813 | 35174 |
| &nbsp;&nbsp;&nbsp;&nbsp;Assets held for sale | 11901 | 11901 |
| **Total Current Assets** | **634215** | **635224** |
| &nbsp;&nbsp;&nbsp;&nbsp;Property, plant and equipment, net | 123849 | 124384 |
| &nbsp;&nbsp;&nbsp;&nbsp;Goodwill | 59003 | 59983 |
| &nbsp;&nbsp;&nbsp;&nbsp;Intangible assets, net | 281280 | 294047 |
| &nbsp;&nbsp;&nbsp;&nbsp;Deferred tax assets | 16223 | 16481 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other non-current assets | 69560 | 73352 |
| &nbsp;&nbsp;&nbsp;&nbsp;Long-term investments | 937 | 1022 |
| **Total Assets** | $**1185067** | $**1204493** |
| **LIABILITIES AND EQUITY** |  |  |
| **Current Liabilities** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Accounts payable | $170605 | $167337 |
| &nbsp;&nbsp;&nbsp;&nbsp;Unearned revenue | 90752 | 87541 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accrued expenses and other liabilities | 31736 | 33690 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accrued wages and benefits | 23449 | 32203 |
| &nbsp;&nbsp;&nbsp;&nbsp;Deferred compensation liability | 37051 | 37447 |
| &nbsp;&nbsp;&nbsp;&nbsp;Income tax payable | 5613 | 3642 |
| **Total Current Liabilities** | **359206** | **361860** |
| &nbsp;&nbsp;&nbsp;&nbsp;Non-current revolving credit agreement | 25000 | 25000 |
| &nbsp;&nbsp;&nbsp;&nbsp;Non-current convertible senior notes, net of debt issuance costs | 193425 | 193038 |
| &nbsp;&nbsp;&nbsp;&nbsp;Deferred tax liabilities | 26776 | 27453 |
| &nbsp;&nbsp;&nbsp;&nbsp;Non-current unearned revenue | 26227 | 27143 |
| &nbsp;&nbsp;&nbsp;&nbsp;Non-current pension liability | 6305 | 6277 |
| &nbsp;&nbsp;&nbsp;&nbsp;Non-current lease obligations | 24940 | 27000 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other non-current liabilities | 16646 | 17564 |
| **Total Liabilities** | **678525** | **685335** |
| Commitments and contingencies (see Note 17) |  |  |
| **Redeemable Non-Controlling Interest** | **369017** | **373328** |
| **Equity** |  |  |
| Common stock, par value $0.01 per share; 200,000 shares authorized; <br> 80,803 shares issued and 80,546 outstanding as of March 31, 2026 and <br> 80,188 shares issued and 79,926 outstanding as of December 31, 2025 | 808 | 802 |
| &nbsp;&nbsp;&nbsp;&nbsp;Additional paid-in capital | 803031 | 801269 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accumulated other comprehensive income | 70046 | 78877 |
| &nbsp;&nbsp;&nbsp;&nbsp;Retained deficit | (731345) | (730010) |
| &nbsp;&nbsp;&nbsp;Less treasury stock at cost: 257 and 262 shares as of March 31, 2026 <br> and December 31, 2025, respectively | (5015) | (5108) |
| **Total Equity** | **137525** | **145830** |
| **Total Liabilities and Equity** | $**1185067** | $**1204493** |

---

See accompanying notes to condensed consolidated financial statements.

------

**ADTRAN Holdings, Inc.**

**CONDENSED CONSOLIDATED STATEMENTS OF LOSS**

**(Unaudited)**

**(In thousands, except per share amounts)**

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** |
|  | **March 31,** | **March 31,** |
|  | **2026** | **2025** |
| **Revenue** |  |  |
| Network Solutions | $237941 | $202217 |
| Services & Support | 48145 | 45527 |
| &nbsp;&nbsp;&nbsp;**Total Revenue** | **286086** | **247744** |
| **Cost of Revenue** |  |  |
| Network Solutions | 154648 | 134241 |
| Services & Support | 18450 | 18327 |
| &nbsp;&nbsp;&nbsp;**Total Cost of Revenue** | **173098** | **152568** |
| &nbsp;&nbsp;&nbsp;**Gross Profit** | **112988** | **95176** |
| Selling, general and administrative expenses | 55836 | 50285 |
| Research and development expenses | 50777 | 48859 |
| &nbsp;&nbsp;&nbsp;**Operating Income (Loss)** | **6375** | **(3968)** |
| Interest and dividend income | 300 | 126 |
| Interest expense | (4241) | (4761) |
| Net investment loss | (850) | (1686) |
| Other income, net | 1263 | 944 |
| &nbsp;&nbsp;&nbsp;**Income (Loss) Before Income Taxes** | **2847** | **(9345)** |
| Income tax (expense) benefit | (1917) | 397 |
| &nbsp;&nbsp;&nbsp;**Net Income (Loss)** | $**930** | $**(8948)** |
| &nbsp;&nbsp;&nbsp;**Less: Net Income attributable to non-controlling interest**<sup>(1)</sup> | **2251** | **2319** |
| &nbsp;&nbsp;&nbsp;**Net Loss attributable to ADTRAN Holdings, Inc.** | $**(1321)** | $**(11267)** |
| Weighted average shares outstanding – basic | 80321 | 79534 |
| Weighted average shares outstanding – diluted | 80321 | 79534 |
| Loss per common share attributable to ADTRAN Holdings, Inc. – basic<sup>(2)</sup> | $(0.01) | $(0.14) |
| Loss per common share attributable to ADTRAN Holdings, Inc. – diluted<sup>(2)</sup> | $(0.01) | $(0.14) |

---

<sup>(1)</sup> <sup>For the three months ended March 31, 2026 and 2025 we accrued</sup><sup>$</sup><sup>2.2</sup> <sup>million and $</sup><sup>2.4</sup><sup>million, respectively, of net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA.</sup>

<sup>(2)</sup> <sup>Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $</sup><sup>0.3</sup><sup>million and a $(</sup><sup>3</sup><sup>) thousand effect of redemption of RNCI for the three months ended March 31, 2026 and 2025. See Note 15 for additional information.</sup>

See accompanying notes to condensed consolidated financial statements.

------

**ADTRAN Holdings, Inc.**

**CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME**

**(Unaudited)**

**(In thousands)**

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** |
|  | **March 31,** | **March 31,** |
|  | **2026** | **2025** |
| Net Income (Loss) | $930 | $(8948) |
| **Other Comprehensive (Loss) Income, net of tax** |  |  |
| &nbsp;&nbsp;&nbsp;Defined benefit plan adjustments | (66) | 131 |
| &nbsp;&nbsp;&nbsp;Foreign currency translation (loss) gain | (8765) | 20247 |
| **Other Comprehensive (Loss) Income, net of tax** | **(8831)** | **20378** |
| **Comprehensive (Loss) Income, net of tax** | **(7901)** | **11430** |
| **Less: Comprehensive Income attributable to non-controlling interest** | 2251 | 2319 |
| **Comprehensive (Loss) Income attributable to ADTRAN Holdings, Inc., net of tax** | $**(10152)** | $**9111** |

---

See accompanying notes to condensed consolidated financial statements.

------

**ADTRAN Holdings, Inc.**

**CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY**

**(Unaudited)**

**(In thousands, except per share amounts)**

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **Common<br>Shares** | **Common<br>Stock** | **Additional<br>Paid-In<br>Capital** | **Retained<br>Deficit** | **Treasury<br>Stock** | **Accumulated Other Comprehensive Income** | **Total<br>Equity** |
| **Balance as of December 31, 2025** | **80188** | $**802** | $**801269** | $**(730010)** | $**(5108)** | $**78877** | $**145830** |
| Net income |  |  |  | 930 |  |  | 930 |
| Annual recurring compensation earned |  |  |  | (2251) |  |  | (2251) |
| Other comprehensive loss, net of tax |  |  |  |  |  | (8831) | (8831) |
| Dividends accrued on unvested restricted stock units |  |  |  | (7) |  |  | (7) |
| Deferred compensation adjustments, net of tax |  |  | (57) |  | 93 |  | 36 |
| ADTRAN RSUs and restricted stock vested | 398 | 4 |  | (1675) |  |  | (1671) |
| ADTRAN stock options exercised | 217 | 2 |  | 1367 |  |  | 1369 |
| Redemption of redeemable non-controlling interest |  |  |  | 301 |  |  | 301 |
| ADTRAN stock-based compensation expense |  |  | 1819 |  |  |  | 1819 |
| **Balance as of March 31, 2026** | **80803** | $**808** | $**803031** | $**(731345)** | $**(5015)** | $**70046** | $**137525** |

---

See accompanying notes to condensed consolidated financial statements.

------

**ADTRAN Holdings, Inc.**

**CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY**

**(Unaudited)**

**(In thousands, except per share amounts)**

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **Common<br>Shares** | **Common<br>Stock** | **Additional<br>Paid-In<br>Capital** | **Retained<br>Deficit** | **Treasury<br>Stock** | **Accumulated Other Comprehensive Income** | **Total<br>Equity** |
| **Balance as of December 31, 2024** | **79483** | $**795** | $**808913** | $**(688813)** | $**(5198)** | $**11254** | $**126951** |
| Net loss |  |  |  | (8948) |  |  | (8948) |
| Annual recurring compensation earned |  |  |  | (2319) |  |  | (2319) |
| Other comprehensive income, net of tax |  |  |  |  |  | 20378 | 20378 |
| Deferred compensation adjustments, net of tax |  |  | (52) |  | 90 |  | 38 |
| ADTRAN RSUs and restricted stock vested | 373 | 4 |  | (1174) |  |  | (1170) |
| ADTRAN stock options exercised | 113 | 1 |  | 755 |  |  | 756 |
| ADTRAN stock-based compensation expense |  |  | 2062 |  |  |  | 2062 |
| Redemption of redeemable non-controlling interest |  |  |  | (3) |  |  | (3) |
| Adtran Networks stock-based compensation expense |  |  | 1148 |  |  |  | 1148 |
| **Balance as of March 31, 2025** | **79969** | $**800** | $**812071** | $**(700502)** | $**(5108)** | $**31632** | $**138893** |

---

See accompanying notes to condensed consolidated financial statements.

------

 **ADTRAN Holdings, Inc.**

**CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS**

**(Unaudited)**

**(In thousands)**

---

| | | |
|:---|:---|:---|
|  | **March 31,** | **March 31,** |
|  | **2026** | **2025** |
| **Cash flows from operating activities:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Net income (loss) | $930 | $(8948) |
| &nbsp;&nbsp;&nbsp;&nbsp;Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Depreciation and amortization | 24916 | 21596 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Amortization of debt issuance cost | 374 | 320 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Amortization of convertible notes issuance costs | 386 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Loss on investments, net | 822 | 1631 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net loss on disposal of property, plant and equipment | 60 | 13 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stock-based compensation expense | 1819 | 3210 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deferred income taxes | (244) | (157) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Inventory reserves | 143 | 3339 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes in operating assets and liabilities: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accounts receivable, net | (6192) | 16011 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other receivables | (3312) | (1141) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Income taxes receivable, net | 896 | (690) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Inventory | 4671 | 10345 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prepaid expenses, other current assets and other assets | (5558) | 1504 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accounts payable | 366 | (4222) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accrued expenses and other liabilities | (9197) | 352 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Income taxes payable | 1790 | 18 |
| **Net cash provided by operating activities** | **12670** | **43181** |
| **Cash flows from investing activities:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Purchases of property, plant and equipment | (7505) | (7399) |
| &nbsp;&nbsp;&nbsp;&nbsp;Purchases of intangibles - developed technology | (8435) | (11296) |
| &nbsp;&nbsp;&nbsp;&nbsp;Proceeds from sales and maturities of available-for-sale investments | 736 | 660 |
| &nbsp;&nbsp;&nbsp;&nbsp;Purchases of available-for-sale investments | (75) | (170) |
| &nbsp;&nbsp;&nbsp;&nbsp;Payments for beneficial interest in securitized accounts receivable | (574) | (133) |
| **Net cash used in investing activities** | **(15853)** | **(18338)** |
| **Cash flows from financing activities:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Tax withholdings related to stock-based compensation settlements | (1645) | (420) |
| &nbsp;&nbsp;&nbsp;&nbsp;Proceeds from stock option exercises | 1369 | 756 |
| &nbsp;&nbsp;&nbsp;&nbsp;Payments on financing agreement | (1400) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Redemption of redeemable non-controlling interest | (8) | (12) |
| **Net cash (used in) provided by financing activities** | **(1684)** | **324** |
| &nbsp;&nbsp;&nbsp;&nbsp;Net (decrease) increase in cash and cash equivalents | (4867) | 25167 |
| &nbsp;&nbsp;&nbsp;&nbsp;Effect of exchange rate changes | (2559) | 133 |
| **Cash and cash equivalents, beginning of period** | **95696** | **76021** |
| **Cash and cash equivalents, end of period** | $**88270** | $**101321** |
| Supplemental disclosure of cash financing activities: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Cash paid for interest | $4451 | $4129 |
| &nbsp;&nbsp;&nbsp;&nbsp;Cash (refund) paid for income taxes, net | $(814) | $2367 |
| &nbsp;&nbsp;&nbsp;&nbsp;Cash used in operating activities related to operating leases | $2425 | $2696 |
| Supplemental disclosure of non-cash investing and financing activities: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Redemption of redeemable non-controlling interest | $301 | $(3) |
| &nbsp;&nbsp;&nbsp;&nbsp;Right-of-use assets obtained in exchange for lease obligations | $183 | $1893 |
| &nbsp;&nbsp;&nbsp;&nbsp;Purchases of property, plant and equipment included in accounts payable | $1296 | $1162 |

---

See accompanying notes to condensed consolidated financial statements.

------

**ADTRAN Holdings, Inc.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

**GENERAL**

ADTRAN Holdings, Inc. ("Adtran" or the "Company") is a leading global provider of networking and communications platforms, software, systems and services focused on the broadband access market, serving a diverse domestic and international customer base in multiple countries that includes large, medium and small Service Providers, alternative Service Providers, such as utilities, municipalities and fiber overbuilders, cable/MSOs, SMBs and distributed enterprises, including Fortune 500 companies with sophisticated business continuity applications; and federal, state and local government agencies. Our innovative solutions and services enable voice, data, video and internet-communications across a variety of network infrastructures and are currently in use by millions worldwide. We support our customers through our direct global sales organization and distribution networks. Our success depends upon our ability to increase unit volume and market share through the introduction of new products and succeeding generations of products having optimal selling prices and increased functionality as compared to both the prior generation of a product and to the products of competitors in order to gain market share. To service our customers and grow revenue, we are continually conducting research and developing new products addressing customer needs and testing those products for the specific requirements of the particular customers. We offer a broad portfolio of flexible software and hardware network solutions and services that enable Service Providers to meet today's service demands, while enabling them to transition to the fully converged, scalable, highly-automated, cloud-controlled voice, data, internet and video network of the future. In addition to our global headquarters in Huntsville, Alabama, and our European headquarters in Munich, Germany, we have sales and research and development facilities in strategic global locations.

The Company solely owns ADTRAN, Inc. and is the majority shareholder of Adtran Networks. ADTRAN, Inc. is a leading global provider of open, disaggregated networking and communications solutions. Adtran Networks is a global provider of network solutions for data, storage, voice and video services. We believe that the combined technology portfolio can best address current and future customer needs for high-speed connectivity from the network core to the end consumer, especially upon the convergence of solutions at the network edge.

 *Domination and Profit and Loss Transfer Agreement, Liquidity, Credit Facility and Notes Offering*

The DPLTA between the Company, as the controlling company, and Adtran Networks, as the controlled company, which was executed on December 1, 2022, became effective on January 16, 2023, as a result of its registration with the commercial register (*Handelsregister*) of the local court (*Amtsgericht*) at the registered seat of Adtran Networks (Jena).

Under the DPLTA, subject to certain limitations pursuant to applicable law and the specific terms of the DPLTA, (i) the Company is entitled to issue binding instructions to the management board of Adtran Networks, (ii) Adtran Networks will transfer its annual profit to the Company, subject to, among other things, the creation or dissolution of certain reserves, and (iii) the Company will absorb the annual net loss incurred by Adtran Networks. The Company's payment obligation in satisfaction of the requirement that it absorb Adtran Networks' annual net loss applied to the net loss generated by Adtran Networks in 2025 and it will apply to any net loss generated by Adtran Networks in 2026.

Pursuant to the terms of the DPLTA, each Adtran Networks shareholder (other than the Company) has received an offer to elect either (1) to remain an Adtran Networks shareholder and receive from us an Annual Recurring Compensation payment, or (2) to receive Exit Compensation plus guaranteed interest. The guaranteed interest under the Exit Compensation is calculated from the effective date of the DPLTA to the date the shares are tendered, less any Annual Recurring Compensation paid. The guaranteed interest rate is 5.0% plus a variable component (according to the German Civil Code) that was 1.27% as of March 31, 2026. Assuming all the minority holders of currently outstanding Adtran Networks shares were to elect the second option, we would be obligated to make aggregate Exit Compensation payments, including guaranteed interest, of approximately €304.4 million or approximately $351.7 million, based on an exchange rate as of March 31, 2026, and reflecting interest accrued through March 31, 2026 during the pendency of the appraisal proceedings discussed below. Shareholders electing the first option of Annual Recurring Compensation may later elect the second option. The opportunity for outside Adtran Networks shareholders to tender Adtran Networks shares in exchange for Exit Compensation had been scheduled to expire on March 16, 2023. However, due to the appraisal proceedings that were initiated in 2023 in accordance with applicable German law, this time period for tendering shares has been extended pursuant to the German Stock Corporation Act (*Aktiengesetz*) and will end two months after the date on which a final decision in such appraisal proceedings has been published in the Federal Gazette (*Bundesanzeiger*). Following the court's decision on a procedural matter in the DPLTA appraisal proceedings on July 14, 2025, the trial on the merits of the DPLTA has recommenced. It is expected to take a minimum of 12 months for a ruling of the court on the merits and such ruling will most likely be appealed, which would be expected to take an additional 12-24 months to be resolved. Accordingly, the Company does not expect a final decision on the DPLTA appraisal proceedings to be rendered and published prior to 2027, and most likely not until 2028 or beyond.

------

Additionally, our obligation to pay Annual Recurring Compensation under the DPLTA is a continuing payment obligation, which will amount to approximately €7.8 million (or $9.0 million based on the current exchange rate) per year assuming none of the minority Adtran Networks shareholders as of March 31, 2026 were to elect Exit Compensation. The foregoing amounts do not reflect any potential increase in payment obligations that we may have depending on the outcome of ongoing appraisal proceedings in Germany. The Annual Recurring Compensation is due on the third banking day following the ordinary general shareholders' meeting of Adtran Networks for the respective preceding fiscal year (but in any event within eight months following expiration of the fiscal year). With respect to the 2025 fiscal year, Adtran Networks' ordinary general shareholder meeting is scheduled for the second quarter of 2026, and the Annual Recurring Compensation will be due on the third banking day following the meeting. During the three months ended March 31, 2026 and 2025, we accrued $2.2 million and $2.4 million, respectively, in Annual Recurring Compensation. The Annual Recurring Compensation is reflected as an increase to retained deficit in the Condensed Consolidated Balance Sheets.

On July 18, 2022, ADTRAN, Inc., as the borrower, and ADTRAN Holdings, Inc. entered into a credit agreement with a syndicate of banks, including Wells Fargo Bank, National Association, as administrative agent ("Administrative Agent"), and the other lenders named therein ("Credit Agreement"), which has since been amended six times. The Company had access to $319.2 million on its Credit Facility for future borrowings based on debt covenant compliance metrics. The financial covenants under the Credit Agreement, as amended, require the Company to maintain a Consolidated Total Net Leverage Ratio of 5.00x, a Consolidated Senior Secured Net Leverage Ratio of 3.25x (4.0x to 3.5x during a Springing Covenant Period) and a Consolidated Fixed Charge Coverage Ratio of 1.25x (as such terms are defined in the Credit Agreement). In addition, during a Springing Covenant Period the cash and cash equivalents of the credit parties must be at least $50.0 million and the cash and cash equivalents of the Company and its subsidiaries must be at least $70.0 million. The Credit Agreement matures in July 2027. The Company intends to refinance or replace the existing Credit Agreement with a new credit facility during the second quarter of 2026. There can be no assurances that this renewal will occur on terms acceptable to the Company, or at all.

On October 18, 2022, the Company's Board of Directors authorized the Company to purchase additional shares of Adtran Networks through open market purchases not to exceed 15,346,544 shares.

As of March 31, 2026, and as of the date of issuance of these financial statements, the Company has sufficient liquidity to meet the majority of its payment obligations under the DPLTA pertaining to Exit Compensation. For the three months ended March 31, 2026, approximately 0.2 million shares of Adtran Networks stock were tendered to the Company and Exit Compensation of €3.6 million or approximately $4.1 million are to be settled in cash in April 2026. For the three months ended March 31, 2025, less than one thousand shares of Adtran Networks stock were tendered to the Company and exit compensation payments of €12 thousand or $13 thousand based on the applicable exchange rates at the time of the transaction were paid to Adtran Networks shareholders. We believe the probability that more than a small minority of Adtran Networks shareholders elect to receive Exit Compensation in the next twelve months is remote based on the following factors: (i) the shareholders can exercise their right to receive the Exit Compensation until two months after publication of the final decision in the appraisal proceedings and we do not expect the final decision to be published within the next 12 months; (ii) the diverse base of shareholders that must make this election on an individual shareholder basis; (iii) the fact the date of a decision by the court on the merits of the case is uncertain, it will most likely take a minimum of 12 months for a ruling and, thereafter, an expected appeal process will take a further 12-24 months to resolve; (iv) the current guaranteed Annual Recurring Compensation payment; and (v) the current trading value of Adtran Networks shares.

Moreover, on September 19, 2025, the Company issued $201.3 million aggregate principal amount of convertible senior notes due 2030 (the "Notes"). The Notes accrue interest at a rate of 3.75% per annum, payable semi-annually in arrears on March 15 and September 15 of each year, beginning March 15, 2026. Unless repurchased earlier, redeemed, or converted, the Notes will mature on September 15, 2030. After deducting the initial purchasers' discounts, commissions, and estimated offering expenses, the Company received net proceeds of $192.6 million.

The Company believes that its cash and cash equivalents, working capital management initiatives and availability to access cash under the Wells Fargo credit facility or other future sources of capital will be adequate to meet our business operating requirements, our capital expenditures and our expected obligations under both the Notes and the DPLTA, including anticipated levels of Exit Compensation, as well as to support our ability to continue to comply with our debt covenants under the Credit Facility for at least the next twelve months, from the issuance of these financial statements. *See Note 10, Credit Agreements, for additional information regarding the terms of the Amendments of the Wells Fargo Credit Agreement.*

**1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES**

**Basis of Presentation**

The accompanying unaudited Condensed Consolidated Financial Statements of ADTRAN Holdings, Inc. and its subsidiaries have been prepared pursuant to the rules and regulations of the SEC applicable to interim financial information presented in Quarterly Reports on Form 10-Q. Accordingly, certain information and notes required by generally accepted accounting principles in the United States of America ("U.S. GAAP") for complete financial statements are not included herein. The December 31, 2025, Condensed Consolidated Balance Sheet is derived from audited financial statements but does not include all disclosures required by U.S. GAAP for annual financial statements.

------

In the opinion of management, all adjustments necessary to fairly state these interim statements have been recorded and are of a normal and recurring nature. The results of operations for an interim period are not necessarily indicative of the results for the full year. The interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in ADTRAN Holdings, Inc. Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on February 26, 2026.

**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, 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 March 31, 2026, 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 assets, revenue recognition and costs of revenue.

During the three months ended March 31, 2026, there were no other significant changes to our critical accounting policies or estimates from those described in the financial statements contained in the 2025 Form 10-K.

**Recent Accounting Pronouncements Not Yet Adopted**

In September 2025, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2025-06, "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software," which is intended to modernize the accounting for the costs of internal-use software given the evolution of software development to the incremental and iterative development method. The amendments remove all references to prescriptive and sequential development stages and, instead, require an entity to start capitalizing software costs when management has authorized and committed to funding the software project, and it is probable that the project will be completed and the software will be used to perform the function intended. The amendments are effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period with the amendments to be applied using a prospective, modified or retrospective transition approach. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements.

In November 2024, the FASB issued 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 (PBEs) 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 for annual periods 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.

**Recently Adopted Accounting Pronouncements**

There are currently no recently adopted accounting pronouncements that are expected to have a material effect on the Condensed Consolidated Financial Statements.

**2. REVENUE AND RECEIVABLES**

The following is a description of the principal activities from which revenue is generated by reportable segment:

*Network Solutions Segment -* Includes hardware and software products that enable a digital future which support the Company's Subscriber, Access & Aggregation, and Optical Networking Solutions.

*Services & Support Segment -* Includes network design, implementation, maintenance and cloud-hosted services supporting the Company's Subscriber, Access & Aggregation, and Optical Networking Solutions.

------

*Revenue by Category*

In addition to the Company's reportable segments, revenue is also reported for the following three categories – Subscriber Solutions, Access & Aggregation Solutions and Optical Networking Solutions.

Our Subscriber Solutions portfolio is used by Service Providers to terminate their access services infrastructure at the customer premises while providing an immersive and interactive experience for residential, business and wholesale subscribers. This revenue category includes hardware- and software-based products and services. These solutions include fiber termination solutions for residential, business and wholesale subscribers, Wi-Fi access solutions for residential and business subscribers, Ethernet switching and network edge virtualization solutions for business subscribers, and cloud software solutions covering a mix of subscriber types.

Our Access & Aggregation Solutions are solutions that are used by communications Service Providers to connect residential subscribers, business subscribers and mobile radio networks to the Service Providers' metro network, primarily through fiber-based connectivity. This revenue category includes hardware- and software-based products and services. Our solutions within this category are a mix of fiber access and aggregation platforms, precision network synchronization and timing solutions, and access orchestration solutions that ensure highly reliable and efficient network performance.

Our Optical Networking Solutions are used by communications Service Providers, internet content providers and large-scale enterprises to securely interconnect metro and regional networks over fiber. This revenue category includes hardware- and software-based products and services. Our solutions within this category include open optical terminals, open line systems, optical subsystems and modules, network infrastructure assurance systems, and automation platforms that are used to build high-scale, secure and assured optical networks.

The following tables disaggregate revenue by reportable segment and revenue category:

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| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** |
|  | **March 31, 2026** | **March 31, 2026** | **March 31, 2026** | **March 31, 2025** | **March 31, 2025** | **March 31, 2025** |
| ***(In thousands)*** | **Network Solutions** | **Services & Support** | **Total** | **Network Solutions** | **Services & Support** | **Total** |
| Subscriber Solutions | $90193 | $8047 | $98240 | $71748 | $8662 | $80410 |
| Optical Networking Solutions | 70952 | 26374 | 97326 | 54622 | 23576 | 78198 |
| Access & Aggregation Solutions | 76796 | 13724 | 90520 | 75847 | 13289 | 89136 |
| &nbsp;&nbsp;**Total** | $**237941** | $**48145** | $**286086** | $**202217** | $**45527** | $**247744** |

---

The aggregate amount of transaction price allocated to remaining performance obligations ("RPO") that have not been satisfied as of March 31, 2026 related to non-cancellable contractual maintenance agreements, non-cancellable contractual SaaS and subscription services, and non-cancellable hardware contracts amounted to $159.2 million. The majority of the Company's performance obligations will generally be satisfied within a year and any remaining performance obligations are typically recognized over one to three years.

The following table provides information about accounts receivable, contract assets and unearned revenue from contracts with customers:

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| | | |
|:---|:---|:---|
|  | **As of** | **As of** |
| ***(In thousands)*** | **March 31, 2026** | **December 31, 2025** |
| Accounts receivable, net | $215473 | $210687 |
| Contract assets<sup>(1)</sup> | $533 | $432 |
| Unearned revenue | $90752 | $87541 |
| Non-current unearned revenue | $26227 | $27143 |

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) Included in other receivables on the Condensed Consolidated Balance Sheets.

*Accounts Receivable*

The allowance for credit losses was $1.7 million and $1.3 million as of March 31, 2026, and December 31, 2025, respectively, related to accounts receivable.

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*Receivables Purchase Agreements*

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. Total accounts receivables factored as of the end of March 31, 2026, totaled $26.1 million of which $3.9 million was retained pursuant to the Factoring Agreement in the reserve account. Total accounts receivables factored as of the end of March 31, 2025, totaled $11.2 million of which $3.7 million was retained pursuant to the Factoring Agreement in the reserve account. The Factoring Agreement provides for up to $40.0 million in factoring capacity, subject to eligible receivables and reserve requirements, secured by the receivables.

During the three months ended March 31, 2026 and 2025, the Company received $51.8 million and $31.8 million, in cash proceeds from the Factoring Agreement, respectively. The cost of the Factoring Agreement is included in interest expense in the Condensed Consolidated Statements of Loss and totaled $0.5 million and $0.3 million for the three months ended March 31, 2026 and 2025, respectively.

*Contract Assets* 

No allowance for credit losses was recorded for the three months ended March 31, 2026 and 2025, respectively, related to contract assets.

*Unearned Revenue*

Of the outstanding unearned revenue balances as of December 31, 2025, $23.1 million were recognized as revenue during the three months ended March 31, 2026. Of the $52.7 outstanding unearned revenue balances as of December 31, 2024, $21.9 million were recognized as revenue during the three months ended March 31, 2025.

**3. INCOME TAXES** 

The Company's effective tax rate changed from a benefit of 4.2% of pre-tax loss for the three months ended March 31, 2025, to an expense of 67.3% of pre-tax income for the three months ended March 31, 2026. The change in the effective tax rate for the three months ended March 31, 2026, was driven primarily by loss jurisdictions for which the recognition of tax benefits on pre-tax losses incurred during the first quarter of 2026 were limited due to valuation allowance.

The Company continually reviews the adequacy of its valuation allowance and recognizes the benefits of deferred tax assets only as the assessment indicates that it is more likely than not that the deferred tax assets will be recognized in accordance with ASC 740, Income Taxes. As of March 31, 2026, the Company had net deferred tax assets totaling $113.9 million, and a valuation allowance totaling $124.5 million against those deferred tax assets. Our assessment of the realizability of our deferred tax assets includes the evaluation of historical operating results, as well as the evaluation of evidence which requires significant judgment, including the evaluation of our three-year cumulative income position, future taxable income projections and tax planning strategies. Should management's conclusion change in the future and an additional valuation allowance, or a partial or full release of the valuation allowance becomes necessary, it may have a material effect on our consolidated financial statements.

**4. STOCK-BASED COMPENSATION**

*2024 Stock Incentive Plans*

At the annual meeting of stockholders held on May 8, 2024, the Company's stockholders approved, upon recommendation of the Board of Directors, the adoption of the ADTRAN Holdings, Inc. 2024 Employee Stock Incentive Plan ("2024 Employee Plan") and the ADTRAN Holdings, Inc. 2024 Directors Stock Plan ("2024 Directors Plan"). Outstanding awards granted under the Company's prior equity incentive plans will remain subject to the terms of such applicable plans, and shares under such plans that are cancelled or forfeited will be available for issuance under the 2024 Employee Plan or the 2024 Directors Plan, as applicable.

As of March 31, 2026, 5.5 million shares were available for issuance pursuant to awards that may be made in the future under stockholder-approved equity plans.

For the three months ended March 31, 2026 and 2025, stock-based compensation expense was $1.8 million and $3.2 million, respectively.

------

*PSUs, RSUs and Restricted Stock*

The following table summarizes the PSUs, RSUs and restricted stock outstanding as of December 31, 2025, and March 31, 2026 and the changes that occurred during the three months ended March 31, 2026:

---

| | | |
|:---|:---|:---|
|  | **Number of <br>Shares<br>(in thousands)** | **Weighted Avg. Grant Date Fair Value<br>(per share)** |
| **Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2025** | **1967** | $**10.70** |
| &nbsp;&nbsp;&nbsp;PSUs, RSUs and restricted stock granted | 95 | $8.88 |
| &nbsp;&nbsp;&nbsp;PSUs, RSUs and restricted stock vested | (487) | $11.50 |
| &nbsp;&nbsp;&nbsp;PSUs, RSUs and restricted stock forfeited | (59) | $19.32 |
| **Unvested PSUs, RSUs and restricted stock outstanding, March 31, 2026** | **1516** | $**9.99** |

---

The fair value of PSUs with performance conditions, RSUs and restricted stock is equal to the closing price of the Company's stock on the date of grant. The fair value of PSUs with market conditions is calculated using a Monte Carlo simulation valuation method.

As of March 31, 2026, total unrecognized compensation expense related to non-vested portion of performance-based PSUs, market-based PSUs, RSUs and restricted stock was approximately $12.1 million, which will be recognized over the remaining weighted-average period of 2.2 years. Unrecognized compensation expense will be adjusted for actual forfeitures.

**5. INVESTMENTS**

The Company has cash equivalents and investments which are held at fair value as follows:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  |  | **Fair Value Measurements as of March 31, 2026 Using** | **Fair Value Measurements as of March 31, 2026 Using** | **Fair Value Measurements as of March 31, 2026 Using** |
| ***(In thousands)*** | **Fair Value** | **Quoted Prices<br>in Active<br>Market for <br>Identical<br>Assets <br>(Level 1)** | **Significant<br>Other<br>Observable<br>Inputs <br>(Level 2)** | **Significant Unobservable Inputs <br>(Level 3)** |
| **Cash equivalents** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Money market funds <sup>(1)</sup> | $246 | $246 | $— | $— |
| **Marketable equity securities** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Marketable equity securities | 937 | 937 |  |  |
| &nbsp;&nbsp;&nbsp;Deferred compensation plan assets | 33813 | 33813 |  |  |
| **Total** | $**34996** | $**34996** | $**—** | $**—** |

---

---

| | | | | |
|:---|:---|:---|:---|:---|
|  |  | **Fair Value Measurements as of December 31, 2025 Using** | **Fair Value Measurements as of December 31, 2025 Using** | **Fair Value Measurements as of December 31, 2025 Using** |
| ***(In thousands)*** | **Fair Value** | **Quoted Prices<br>in Active<br>Market for <br>Identical<br>Assets <br>(Level 1)** | **Significant<br>Other<br>Observable<br>Inputs <br>(Level 2)** | **Significant Unobservable Inputs <br>(Level 3)** |
| **Cash equivalents** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Money market funds <sup>(1)</sup> | $245 | $245 | $— | $— |
| **Marketable equity securities** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Marketable equity securities | 1022 | 1022 |  |  |
| &nbsp;&nbsp;&nbsp;Deferred compensation plan assets | 35174 | 35174 |  |  |
| **Total** | $**36441** | $**36441** | $**—** | $**—** |

---

<sup>(1) The money market fund balances of $</sup><sup>0.2</sup><sup>million as of March 31, 2026 and December 31, 2025, are included in cash and cash equivalents on the balance sheet.</sup>

Market prices are obtained from a variety of industry standard data providers, large financial institutions and other third-party sources. These multiple market prices are used as inputs into a distribution-curve-based algorithm to determine the daily market value of each security.

U.S. GAAP establishes a three-level valuation hierarchy based upon observable and unobservable inputs for fair value measurement of financial instruments:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

• Level 1 – Observable outputs; values based on unadjusted quoted prices for identical assets or liabilities in an active market;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Level 2 – Significant inputs that are observable; values based on quoted prices in markets that are not active or model inputs that are observable either directly or indirectly and

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Level 3 – Significant unobservable inputs; values based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs could include information supplied by investees.

------

**6. INVENTORY**

As of March 31, 2026 and December 31, 2025, inventory, net was comprised of the following:

---

| | | |
|:---|:---|:---|
|  | **As of** | **As of** |
| ***(In thousands)*** | **March 31, 2026** | **December 31, 2025** |
| Raw materials | $80069 | $78230 |
| Work in process | 12867 | 12801 |
| Finished goods | 116067 | 124705 |
| &nbsp;&nbsp;&nbsp;**Total inventory, net** | $**209003** | $**215736** |

---

Inventory reserves are established 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 considers historical usage, known trends, inventory age and market conditions.

**7. PROPERTY, PLANT AND EQUIPMENT**

Property, plant and equipment consisted of the following:

---

| | | |
|:---|:---|:---|
|  | **As of** | **As of** |
| ***(In thousands)*** | **March 31, 2026** | **December 31, 2025** |
| Engineering and other equipment | $133656 | $131665 |
| Building | 52374 | 52586 |
| Computer hardware and software | 113483 | 109703 |
| Building and land improvements | 43319 | 43271 |
| Furniture and fixtures | 19506 | 19287 |
| Land | 3061 | 3073 |
| **&nbsp;&nbsp;&nbsp;&nbsp; Total property, plant and equipment** | **365399** | **359585** |
| Less: accumulated depreciation and amortization | (241550) | (235201) |
| **&nbsp;&nbsp;&nbsp;&nbsp; Total property, plant and equipment, net** | $**123849** | $**124384** |

---

Long-lived assets used in operations are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable and the undiscounted cash flows estimated to be generated by the asset are less than the asset's carrying value.

Depreciation expense was $8.1 million and $6.9 million for the three months ended March 31, 2026 and 2025, respectively, which is recorded in cost of revenue, selling, general and administrative expenses and research and development expenses in the Condensed Consolidated Statements of Loss.

*Assets Held For Sale*

On December 31, 2025, the Company determined that it continued to meet the held for sale criteria pursuant to ASC 360, *"Impairment and Disposal of Long-Live Assets"* on a portion of the Company's property located at its Huntsville, Alabama campus and ceased recording depreciation on the assets. The Company continues to assess the probability that the sale of its headquarters in Huntsville will occur and has determined it is probable of occurring in the next twelve months.

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 March 31, 2026 and December 31, 2025, respectively, and is separately recorded on the balance sheet.

**8. GOODWILL**

The changes in the carrying amount of goodwill for the three months ended March 31, 2026 and the twelve months ended December 31, 2025, are as follows:

---

| | |
|:---|:---|
| ***(In thousands)*** | **Services & Support** |
| **As of December 31, 2024** | $**52918** |
| Foreign currency translation adjustments | 7065 |
| **As of December 31, 2025** | $**59983** |
| Foreign currency translation adjustments | (980) |
| **As of March 31, 2026** | $**59003** |

---

Goodwill represents the excess purchase price over the fair value of net assets acquired. The Company performs its annual goodwill impairment test as of the first day of the fourth quarter. In addition, the Company performs an interim impairment assessment prior to our annual measurement date whenever events or changes in circumstances indicate that the carrying amount of such assets (or group of assets) may not be recoverable.

------

No impairment of goodwill was recognized during the three months ended March 31, 2026 and 2025. As of March 31, 2026, accumulated goodwill impairment losses totaled $335.3 million.

**9. INTANGIBLE ASSETS**

Intangible assets as of March 31, 2026 and December 31, 2025, consisted of the following:

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  | **As of March 31, 2026** | **As of March 31, 2026** | **As of March 31, 2026** | **As of December 31, 2025** | **As of December 31, 2025** | **As of December 31, 2025** |
| ***(In thousands excluding years)*** | **Weighted Average Useful Life<br>(in years)** | **Gross Carrying Amount** | **Accumulated Amortization** | **Net Book Value** | **Gross Carrying Amount** | **Accumulated Amortization** | **Net Book Value** |
| Customer relationships | 11.0 | $55540 | $(26231) | $29309 | $56244 | $(25306) | $30938 |
| Backlog | 1.7 | 60077 | (60077) |  | 61081 | (61081) |  |
| Developed technology | 7.4 | 431208 | (180675) | 250533 | 429329 | (168073) | 261256 |
| Licensed technology | 9.0 | 5900 | (5272) | 628 | 5900 | (5108) | 792 |
| Licensed agreements | 8.5 | 560 | (456) | 104 | 560 | (446) | 114 |
| Trade names | 2.8 | 31078 | (30372) | 706 | 31598 | (30651) | 947 |
| **&nbsp;&nbsp;&nbsp;&nbsp; Total** |  | $**584363** | $**(303083)** | $**281280** | $**584712** | $**(290665)** | $**294047** |

---

No impairment losses of intangible assets were recorded during the three months ended March 31, 2026 and 2025.

Amortization expense was $16.9 million and $14.9 million in the three months ended March 31, 2026 and 2025, respectively, and was included in cost of revenue, selling, general and administrative expenses and research and development expenses in the Condensed Consolidated Statements of Loss.

During the three months ended March 31, 2026, the Company had development costs of $8.4 million for developed technology assets with a weighted average amortization period of three years with no expected residual value.

Estimated future amortization expense of intangible assets is as follows:

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| | |
|:---|:---|
|  | **As of** |
| ***(In thousands)*** | **March 31, 2026** |
| 2026 | $52238 |
| 2027 | 64630 |
| 2028 | 55854 |
| 2029 | 47215 |
| 2030 | 44627 |
| Thereafter | 16716 |
| **&nbsp;&nbsp;&nbsp;&nbsp; Total** | $**281280** |

---

**10. CREDIT AGREEMENTS**

The carrying amounts of the Company's non-current revolving credit facility in its Condensed Consolidated Balance Sheets were as follows:

---

| | | |
|:---|:---|:---|
|  | **As of** | **As of** |
| ***(In thousands)*** | **March 31, 2026** | **December 31, 2025** |
| Wells Fargo credit agreement | $25000 | $25000 |
| &nbsp;&nbsp;&nbsp;**Total non-current revolving credit facility** | $**25000** | $**25000** |

---

As of March 31, 2026 and December 31, 2025, the estimated fair value of our revolving credit agreement approximates the carrying value. As of March 31, 2026, the weighted average interest rate on our revolving credit agreement was 8.92%.

*Revolving Credit Agreement* 

On July 18, 2022, ADTRAN, Inc., as the borrower ("U.S. Borrower"), and the Company entered into a credit agreement with a syndicate of banks, including Wells Fargo Bank, National Association, as administrative agent ("Administrative Agent"), and the other lenders named therein (the "Original Credit Agreement"), as amended by the First Amendment to Credit Agreement, dated August 9, 2023 ("Amendment No. 1"), the Second Amendment to Credit Agreement, dated January 16, 2024 ("Amendment No. 2"), the Third Amendment to Credit Agreement, dated March 12, 2024 ("Amendment No. 3"), the Fourth Amendment to Credit Amendment, dated June 4, 2024 among Adtran Networks (the "German Borrower") and the parties set forth above ("Amendment No. 4"), the Fifth Amendment to Credit Agreement and Waiver, dated May 6, 2025, among the German Borrower and the parties set forth above ("Amendment No. 5"), and the Sixth Amendment and Consent Credit Agreement, dated September 16, 2025, among the U.S. Borrower,

------

the German Borrower and the lenders party thereto ("Amendment No. 6"); (the Original Credit Agreement as amended by Amendment No. 1, Amendment No. 2. Amendment No. 3, Amendment No. 4 and Amendment No. 5, the "Existing Credit Agreement").

As of March 31, 2026, the Amended Credit Agreement provided for a secured revolving credit facility of up to $350.0 million of borrowings, $50.0 million of which is solely available to the German Borrower.

As of March 31, 2026, the Company's borrowings under the revolving line of credit were $25.0 million. The credit facilities provided under the Amended Credit Agreement mature in July 2027, but the U.S. Borrower may request extensions subject to customary conditions. In addition, the U.S. Borrower may utilize up to $50.0 million of the $350.0 million total revolving facility for the issuance of letters of credit. As of March 31, 2026, the U.S. Borrower had a total of $5.8 million in letters of credit under the Amended Credit Agreement, leaving a net amount (after giving effect to the $25.0 million of outstanding borrowings described above) of $319.2 million available for future borrowings, based on debt covenant compliance metrics. Any future credit extensions under the Amended Credit Agreement are subject to customary conditions precedent. The proceeds of any loans may be used as described above, as well as for working capital and other general corporate purposes.

Moreover, the Amended Credit Agreement provides for a sublimit under the existing $350.0 million revolving commitments in an aggregate amount of $50.0 million ("Subline"), which Subline is available for borrowings by the German Borrower. The Company had no borrowings under the Subline as of March 31, 2026. The existing swing line sublimit and letter of credit sublimit under the Amended Credit Agreement remain available to the U.S. Borrower (and not to the German Borrower). Otherwise, the loans under the Subline are subject to substantially the same terms and conditions under the Amended Credit Agreement (including with respect to the interest rate and maturity date) as the other existing revolving commitments.

**11. CONVERTIBLE SENIOR NOTES AND CAPPED CALLS**

The outstanding principal and carrying value of the convertible senior notes were as follows:

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| | | |
|:---|:---|:---|
|  | **As of** | **As of** |
| ***(In thousands)*** | **March 31, 2026** | **December 31, 2025** |
| Convertible senior notes | $201250 | $201250 |
| Less: unamortized debt issuance costs | (7825) | (8212) |
| &nbsp;&nbsp;&nbsp;**Non-current convertible senior notes** | $**193425** | $**193038** |

---

The estimated fair value of the 2030 Notes was $273.9 million and $217.5 million as of March 31, 2026 and December 31, 2025, respectively. The estimated fair value of the 2030 Notes, based on Level 2 inputs of the valuation hierarchy, were determined based on the quoted bid prices of the 2030 Notes in an over-the-counter market on the last trading day of the reporting period.

The effective interest rate of the 2030 Notes over their expected life is 4.7%. The following is a summary of interest expense for the 2030 Notes:

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| | |
|:---|:---|
|  | **Three Months Ended** |
| ***(In thousands)*** | **March 31, 2026** |
| Contractual interest | $1854 |
| Amortization of issuance costs | 387 |
| &nbsp;&nbsp;&nbsp;**Total interest expense** | $**2241** |

---

On September 19, 2025, the Company issued $201.3 million principal amount of its 3.75% convertible senior notes due September 15, 2030. The 2030 Notes were issued pursuant to, and are governed by, an indenture (the "Indenture"), dated as of September 19, 2025, between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"). The 2030 Notes are the Company's senior, unsecured obligations and bear interest at a rate of 3.75% per year payable semi-annually in arrears on March 15 and September 15 of each year, beginning on March 15, 2026. Each $1,000 principal amount of the 2030 Notes will be convertible into 86.8206 shares of the Company's common stock, which is equivalent to a conversion price of approximately $11.52 per share, subject to adjustment upon the occurrence of specified events. In addition, if certain corporate events that constitute a "make-whole fundamental change" (as defined in the Indenture) occur, then the conversion rate will, in certain circumstances, be increased for a specified period of time.

The 2030 Notes are convertible at the option of the holders of the 2030 Notes before June 15, 2030, only under the following circumstances: (1) during any calendar quarter (and only during such calendar quarter) commencing after the calendar quarter ending on December 31, 2025, if the last reported sale price per share of the Company's common stock exceeds 130% of the conversion price for each of at least 20 trading days, whether or not consecutive, during the last 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter; (2) during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the "measurement period") if the trading price per $1,000 principal amount of the 2030 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of our common stock on such trading day and the conversion rate on such trading day; (3) upon the occurrence of certain corporate events or distributions on the Company's common stock; or (4) if the Company calls (or is deemed to have called) the 2030 Notes for redemption. From and after June 15, 2030, noteholders may convert their 2030 Notes at any time at their election until

------

the close of business on the second scheduled trading day immediately before the maturity date. The Company will settle conversions by paying cash up to the aggregate principal amount of the 2030 Notes to be converted and paying or delivering, as applicable, cash, shares of its common stock or a combination of cash and shares of its common stock, at the Company's election, in respect of the remainder, if any, of its conversion obligation in excess of the aggregate principal amount of the Notes being converted, based on the applicable conversion rate.

The 2030 Notes will be redeemable, in whole or in part (subject to certain limitations described below), at the Company's option at any time, and from time to time, on or after September 20, 2028 and on or before the 46th scheduled trading day immediately before the maturity date, but only if (i) the Notes are "Freely Tradable" (as defined in the Indenture) as of the date the Company sends the related redemption notice, and all accrued and unpaid additional interest, if any, has been paid in full as of the most recent interest payment date occurring on or before the date the Company sends the related redemption notice; and (ii) the last reported sale price per share of the Company's common stock exceeds 130% of the conversion price on (1) each of at least 20 trading days, whether or not consecutive, during the last 30 consecutive trading days ending on, and including, the trading day immediately before the date the Company sends the related redemption notice; and (2) the trading day immediately before the date the Company sends such redemption notice. However, the Company may not redeem less than all of the outstanding Notes unless at least $70.0 million aggregate principal amount of Notes are outstanding and not called for redemption as of the time the Company sends, and after giving effect to, the related redemption notice. The redemption price will be a cash amount equal to the principal amount of the Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. In addition, calling (or the deemed calling of) any Note for redemption will constitute a "make-whole fundamental change" with respect to that Note, in which case the conversion rate applicable to the conversion of that Note will be increased in certain circumstances if it is converted during the related redemption conversion period. No sinking fund is provided for the 2030 Notes, which means the Company is not required to redeem or retire the 2030 Notes periodically.

If certain corporate events that constitute a "fundamental change" (as defined in the Indenture) occur, then, subject to a limited exception for certain cash mergers, noteholders may require the Company to repurchase their Notes at a cash repurchase price equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase date. The definition of "fundamental change" includes certain business combination transactions involving the Company and certain de-listing events with respect to the Company's common stock.

*Capped Calls*

In connection with the pricing of the 2030 Notes and the exercise of the initial purchasers' option to purchase additional 2030 Notes, the Company entered into privately negotiated capped call transactions with one of the initial purchasers of the 2030 Notes or its affiliate and certain other financial institutions pursuant to capped call confirmations (collectively, the "Capped Calls"). The premiums paid for the purchases of the Capped Calls were approximately $17.6 million. The Capped Calls have an initial strike price of approximately $11.52 per share, subject to certain adjustments substantially similar to those applicable to the corresponding 2030 Notes. The Capped Calls have an initial cap price of approximately $15.51 per share, subject to certain adjustments. The Capped Calls cover, subject to anti-dilution adjustments, approximately 17.5 million shares of the Company's common stock.

The Capped Calls are generally expected to reduce potential dilution to the Company's common stock and/or offset any cash payments that the Company is required to make in excess of the principal amount of any converted 2030 Notes, with such reduction and/or offset subject to a cap, based on the cap price of the Capped Calls.

The Capped Calls are separate transactions and are not part of the terms of the 2030 Notes. The Capped Calls do not meet the criteria for separate accounting as a derivative as they are indexed to the Company's stock and meet the requirements to be classified in equity and, as such, are not remeasured each reporting period.

**12. EMPLOYEE BENEFIT PLANS**

*<u>Pension Benefit Plan</u>*

We maintain a defined benefit pension plan covering employees in certain foreign countries. The net amounts recognized in the Condensed Consolidated Balance Sheets for the unfunded pension liability as of March 31, 2026 and December 31, 2025 were as follows:

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| | | | |
|:---|:---|:---|:---|
|  |  | **As of** | **As of** |
| ***(In thousands)*** | **Balance Sheet Location** | **March 31, 2026** | **December 31, 2025** |
| Non-current pension asset | Other non-current assets | $3148 | $2291 |
| Current pension liability | Accrued wages and benefits | (366) | (372) |
| Non-current pension liability | Non-current pension liability | (6305) | (6277) |
| **Net pension liability** |  | $**(3523)** | $**(4358)** |

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The Company's defined benefit pension liability represents the projected benefit obligation, which is the actuarial present value of the vested benefits to which the employee is currently entitled based on the employee's expected date of retirement.

The following table summarizes the components of net periodic pension cost related to the Company's defined benefit pension plans:

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| | | |
|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** |
|  | **March 31,** | **March 31,** |
| ***(In thousands)*** | **2026** | **2025** |
| Service cost | $848 | $389 |
| Interest cost | 366 | 486 |
| Expected return on plan assets | (521) | (588) |
| Amortization of actuarial losses | 20 | 11 |
| &nbsp;&nbsp;&nbsp;**Net periodic pension cost** | $**713** | $**298** |

---

The components of net periodic pension cost, other than the service cost component, are included in other income, net in the Condensed Consolidated Statements of Loss. Service cost is included in cost of revenue, selling, general and administrative expenses and research and development expenses in the Condensed Consolidated Statements of Loss. The Company made contributions to the defined benefit pension plans totaling $1.1 million during the three months ended March 31, 2026 and 2025. Contributions to the defined benefit pension plans for the remainder of 2026 will be limited to benefit payments to retirees which are paid out of the operating cash flows of the Company and are expected to be approximately $1.6 million.

**13. EQUITY**

*Accumulated Other Comprehensive Income*

The following tables present the changes in accumulated other comprehensive income, net of tax, by component:

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | **Three Months Ended March 31, 2026** | **Three Months Ended March 31, 2026** | **Three Months Ended March 31, 2026** | **Three Months Ended March 31, 2026** | **Three Months Ended March 31, 2026** |
| ***(In thousands)*** | **Unrealized<br>(Losses) Gains<br>on<br>Available-<br>for-Sale <br>Securities** | **Defined <br>Benefit Plan <br>Adjustments** | **Foreign <br>Currency Translation <br>Adjustments** | **ASU 2018-02 Adoption** | **Total** |
| **Balance as of December 31, 2025** | $**(382)** | $**3083** | $**75791** | $**385** | $**78877** |
| &nbsp;&nbsp;&nbsp;Other comprehensive income (loss) before<br> reclassifications | 15 |  | (8765) |  | (8750) |
| &nbsp;&nbsp;&nbsp;Amounts reclassified from accumulated other <br> comprehensive loss | (15) | (66) |  |  | (81) |
| &nbsp;&nbsp;&nbsp;Net current period other comprehensive loss |  | (66) | (8765) |  | (8831) |
| **Balance as of March 31, 2026** | $**(382)** | $**3017** | $**67026** | $**385** | $**70046** |

---

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | **Three Months Ended March 31, 2025** | **Three Months Ended March 31, 2025** | **Three Months Ended March 31, 2025** | **Three Months Ended March 31, 2025** | **Three Months Ended March 31, 2025** |
| ***(In thousands)*** | **Unrealized<br>(Losses) <br>Gains<br>on<br>Available-<br>for-Sale <br>Securities** | **Defined<br>Benefit Plan <br>Adjustments** | **Foreign <br>Currency Translation <br>Adjustments** | **ASU 2018-02 Adoption** | **Total** |
| **Balance as of December 31, 2024** | $**(382)** | $**(1027)** | $**12278** | $**385** | $**11254** |
| &nbsp;&nbsp;&nbsp;Other comprehensive income before<br> reclassifications | 48 |  | 20247 |  | 20295 |
| &nbsp;&nbsp;&nbsp;Amounts reclassified from accumulated other<br> comprehensive (loss) income | (48) | 131 |  |  | 83 |
| &nbsp;&nbsp;&nbsp;Net current period other comprehensive income |  | 131 | 20247 |  | 20378 |
| **Balance as of March 31, 2025** | $**(382)** | $**(896)** | $**32525** | $**385** | $**31632** |

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The following tables present the details of reclassifications out of accumulated other comprehensive (loss) income:

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| | | |
|:---|:---|:---|
|  | **Three Months Ended March 31, 2026** | **Three Months Ended March 31, 2026** |
| ***(In thousands)*** | **Amount Reclassified from Accumulated <br>Other Comprehensive Loss** | **Affected Line Item** |
| Unrealized gain on available-for-sale securities: |  |  |
| &nbsp;&nbsp;&nbsp;Net realized loss on sales of securities | $(20) | Net investment loss |
| Defined benefit plan adjustments – actuarial loss | (96) | Other (expense) income |
| **Total reclassifications for the period, before tax** | **(116)** |  |
| Tax benefit | 35 |  |
| **Total reclassifications for the period, net of tax** | $**(81)** |  |

---

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| | | |
|:---|:---|:---|
|  | **Three Months Ended March 31, 2025** | **Three Months Ended March 31, 2025** |
| ***(In thousands)*** | **Amount Reclassified from Accumulated Other Comprehensive Income** | **Affected Line Item** |
| Unrealized gain on available-for-sale securities: |  |  |
| &nbsp;&nbsp;&nbsp;Net realized loss on sales of securities | $(65) | Net investment loss |
| Defined benefit plan adjustments – actuarial gain | 190 | Other (expense) income |
| **Total reclassifications for the period, before tax** | **125** |  |
| Tax expense | (42) |  |
| **Total reclassifications for the period, net of tax** | $**83** |  |

---

The following table presents the tax effects related to the change in each component of other comprehensive (loss) income:

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| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** |
|  | **March 31, 2026** | **March 31, 2026** | **March 31, 2026** | **March 31, 2025** | **March 31, 2025** | **March 31, 2025** |
| ***(In thousands)*** | **Before-Tax <br>Amount** | **Tax <br>(Expense)<br>Benefit** | **Net-of-Tax <br>Amount** | **Before-Tax <br>Amount** | **Tax<br>(Expense)<br>Benefit** | **Net-of-Tax<br>Amount** |
| Unrealized gain (loss) on available-for-sale securities | $20 | $(5) | 15 | $65 | $(17) | 48 |
| Reclassification adjustment for amounts related to available-for-sale investments included in net loss | (20) | 5 | (15) | (65) | 17 | (48) |
| Reclassification adjustment for amounts related to defined benefit plan adjustments included in net (loss) gain | (96) | 30 | (66) | 190 | (59) | 131 |
| Foreign currency translation adjustments | (8765) |  | (8765) | 20247 |  | 20247 |
| **Total Other Comprehensive (Loss) Income** | $**(8861)** | $**30** | $**(8831)** | $**20437** | $**(59)** | $**20378** |

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**14. REDEEMABLE NON-CONTROLLING INTEREST**

As of March 31, 2026 and December 31, 2025, the non-controlling Adtran Networks stockholders' equity ownership percentage in Adtran Networks was approximately 28.8% and 29.2%, respectively.

The following table summarizes the redeemable non-controlling interest activity for the three months ended March 31, 2026 and for the year ended December 31, 2025:

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| | | |
|:---|:---|:---|
|  | **Three Months Ended** | **For the Year Ended** |
| ***(In thousands)*** | **March 31, 2026** | **December 31, 2025** |
| **Balance at beginning of period** | $**373328** | $**422943** |
| &nbsp;&nbsp;&nbsp;Redemption of redeemable non-controlling interest | (4311) | (49615) |
| &nbsp;&nbsp;&nbsp;Net income attributable to redeemable non-controlling interests | 2251 | 9413 |
| &nbsp;&nbsp;&nbsp;Annual recurring compensation earned | (2251) | (9413) |
| **Balance at end of period** | $**369017** | $**373328** |

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Annual recurring compensation payable on untendered outstanding shares under the DPLTA must be recognized as it is accrued. For the three months ended March 31, 2026, we accrued $2.2 million and for the year ended December 31, 2025, the Company accrued $9.3 million, representing the portion of the annual recurring cash compensation to the non-controlling shareholders during such periods. The 2025 Annual Recurring Compensation accrual will be paid after the ordinary general shareholders' meeting of Adtran Networks in 2026. The 2026 Annual Recurring Compensation accrual will be paid after the ordinary general shareholders' meeting of Adtran Networks in 2027.

**15. LOSS PER SHARE**

The calculation of basic and diluted loss per share for the quarters ended March 31, 2026 and 2025 are as follows:

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| | | |
|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** |
|  | **March 31,** | **March 31,** |
| ***(In thousands, except per share amounts)*** | **2026** | **2025** |
| **Numerator** |  |  |
| &nbsp;&nbsp;&nbsp;Net loss attributable to ADTRAN Holdings, Inc. | $(1321) | $(11267) |
| &nbsp;&nbsp;&nbsp;Effect of redemption of RNCI | 301 | (3) |
| &nbsp;&nbsp;&nbsp;Net loss attributable to ADTRAN Holdings, Inc. common stockholders | $(1020) | $(11270) |
| **Denominator** |  |  |
| &nbsp;&nbsp;&nbsp;Weighted average number of shares – basic | 80321 | 79534 |
| &nbsp;&nbsp;&nbsp;Weighted average number of shares – diluted | 80321 | 79534 |
| &nbsp;&nbsp;&nbsp;Loss per share attributable to ADTRAN Holdings, Inc. – basic | $(0.01) | $(0.14) |
| &nbsp;&nbsp;&nbsp;Loss per share attributable to ADTRAN Holdings, Inc. – diluted | $(0.01) | $(0.14) |

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The following potentially dilutive shares were excluded from the calculation of the diluted weighted average number of shares outstanding as the effect would have been anti-dilutive:

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| | | |
|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** |
|  | **March 31,** | **March 31,** |
| ***(In thousands)*** | **2026** | **2025** |
| &nbsp;&nbsp;&nbsp;Convertible senior notes | 2440 |  |
| &nbsp;&nbsp;&nbsp;Stock options | 794 | 711 |
| &nbsp;&nbsp;&nbsp;PSUs, RSUs and restricted stock | 446 | 202 |

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**16. SEGMENT INFORMATION**

The chief operating decision maker is the Company's Chief Executive Officer who regularly reviews the Company's financial performance based on two reportable segments: (1) Network Solutions and (2) Services & Support.

The Network Solutions segment includes hardware and software products that enable a digital future which support the Company's Subscriber, Access & Aggregation, and Optical Networking Solutions. The Company's cloud-managed Wi-Fi gateways, virtualization software, and switches provide a mix of wired and wireless connectivity at the customer premises. In addition, its Carrier Ethernet products support a variety of applications at the network edge ranging from mobile backhaul to connecting enterprise customers ("Subscriber Solutions"). The Company's portfolio includes products for multi-gigabit service delivery over fiber or alternative media to homes and businesses.

The Services & Support segment offers a comprehensive portfolio of network design, implementation, maintenance and cloud-hosted services supporting its Subscriber, Access & Aggregation, and Optical Networking Solutions. These services assist operators in the deployment of multi-vendor networks while reducing their cost to maintain these networks. The cloud-hosted services include a suite of SaaS applications under the Company's Mosaic One platform that manages end-to-end network and service optimization for both fiber access infrastructure and mesh Wi-Fi connectivity. The Company backs these services with a global support organization that offers on-site and off-site support services with varying SLAs.

The performance of these segments is evaluated based on revenue, gross profit and gross margin; therefore, selling, general and administrative expenses, research and development expenses, interest and dividend income, interest expense, net investment loss, other income, net and income tax (expense) benefit are reported on a consolidated basis only. There is no inter-segment revenue. Asset information by reportable segment is not produced and, therefore, is not reported.

The following tables present information about the revenue and gross profit of the Company's reportable segments:

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| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** | **Three Months Ended** |
|  | **March 31, 2026** | **March 31, 2026** | **March 31, 2026** | **March 31, 2025** | **March 31, 2025** | **March 31, 2025** |
| ***(In thousands)*** | **Revenue** | **Cost of Revenue** | **Gross Profit** | **Revenue** | **Cost of Revenue** | **Gross Profit** |
| Network Solutions | $237941 | $154648 | $83293 | $202217 | $134241 | $67976 |
| Services & Support | 48145 | 18450 | 29695 | 45527 | 18327 | 27200 |
| &nbsp;&nbsp;&nbsp;**Total** | $**286086** | $**173098** | $**112988** | $**247744** | $**152568** | $**95176** |

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For the three months ended March 31, 2026 and 2025, $1.7 million and $1.3 million, respectively, of depreciation expense was included in gross profit for our Network Solutions segment. For the three months ended March 31, 2026 and 2025, less than $0.1 million of depreciation expense was included in gross profit for our Services & Support segment.

*Revenue by Geographic Area*

The following table presents revenue information by geographic area:

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| | | |
|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** |
|  | **March 31,** | **March 31,** |
| ***(In thousands)*** | **2026** | **2025** |
| United States | $146167 | $103189 |
| United Kingdom | 43805 | 62909 |
| Germany | 33925 | 27188 |
| Other international | 62189 | 54458 |
| &nbsp;&nbsp;**Total** | $**286086** | $**247744** |

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**17. COMMITMENTS AND CONTINGENCIES** 

*Legal Matters*

From time to time, the Company is subject to or otherwise involved in various lawsuits, claims, investigations and legal proceedings that arise out of or are incidental to the conduct of our business (collectively, "Legal Matters"), including those relating to employment matters, patent rights, regulatory compliance matters, stockholder claims, and contractual and other commercial disputes. Such Legal Matters, even if not meritorious, could result in the expenditure of significant financial and managerial resources. Additionally, an unfavorable outcome in a legal matter, including in a patent dispute, could require the Company to pay damages, entitle claimants to other relief, such as royalties, or could prevent the Company from selling some of its products in certain jurisdictions. The Company records an accrual for any Legal Matters that arise whenever it considers that it is probable that it is exposed to a loss contingency and the amount of the loss contingency can be reasonably estimated. Although the ultimate disposition of asserted claims cannot be predicted with certainty, it is our belief that the outcome of any such claims, either individually or on a combined basis, will not have a material adverse effect on our consolidated financial position.

As disclosed in Amendment No. 1 to our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on May 20, 2025, we identified errors in our previously issued financial statements related to the historical accounting for certain inventory and cost of goods sold transactions ("Adjustment"). The affected periods included the annual periods ended December 31, 2023 and 2024 and the interim periods ended March 31, 2024, June 30, 2024 and September 30, 2024. In connection with the identification of the Adjustment, the Audit Committee oversaw an internal investigation into the circumstances surrounding the Adjustment and its impact on the Company's historical financial statements. Based on the findings of the internal investigation, it was determined that the underlying errors giving rise to the Adjustment were not properly addressed in the Company's previously filed financial statements as of and for the years ended December 31, 2024 and 2023 and were not communicated to the Audit Committee or the independent auditors prior to the filing of the initial Annual Report on Form 10-K for the year ended December 31, 2024. The Company has taken certain remedial actions to address the material weaknesses in its internal controls associated with these findings. On August 4, 2025, the Company received a letter from the Atlanta regional office of the SEC in connection with a non-public, fact-finding inquiry, requesting that we voluntarily provide information regarding the internal investigation. The Company is cooperating in response to the SEC's inquiry and cannot predict the timing or outcome of the inquiry.

*DPLTA Appraisal Proceedings*

In addition to such Legal Matters, the Company is a party to appraisal proceedings relating to the DPLTA which were originally filed with the Landgericht Meiningen (Meiningen District Court) on February 3, 2023. The DPLTA provides that Adtran Networks shareholders (other than the Company) be offered, at their election, (i) to put their Adtran Networks shares to the Company in exchange for compensation in cash of €17.21 per share, plus guaranteed interest or (ii) to remain Adtran Networks shareholders and receive recurring cash compensation of €0.52 per share for each full fiscal year of Adtran Networks. The appraisal proceedings, which were initiated by certain minority shareholders of Adtran Networks, challenge the adequacy of both forms of compensation. While the Company believes that the compensation offered in connection with the DPLTA is fair, it notes that German courts often adjudicate increases of the cash compensation to plaintiffs in varying amounts in connection with German appraisal proceedings. Therefore, the Company cannot rule out that the first instance court or an appellate court may increase the cash compensation owed to the minority Adtran Networks shareholders. Given the stage of the appraisal proceedings, the Company is currently unable to predict the likely outcome or estimate the potential financial impact, if any, of the appraisal proceedings. If a ruling were to occur and be upheld upon appeal that required the Company to pay significant additional cash compensation to the Adtran Networks minority shareholders, there exists the possibility of a material adverse effect on our financial position and results of operations for the period in which the ruling occurs or future periods.

*DPLTA Exit and Recurring Compensation Costs and the Absorption of Adtran Network's Annual Net Loss*

Pursuant to the terms of the DPLTA, each Adtran Networks shareholder (other than the Company) has received an offer to elect either (1) to remain an Adtran Networks shareholder and receive from us an Annual Recurring Compensation payment, or (2) to receive Exit Compensation plus guaranteed interest. The guaranteed interest under the Exit Compensation is calculated from the effective date of the DPLTA to the date the shares are tendered, less any Annual Recurring Compensation paid. The guaranteed interest rate is 5.0% plus a variable component (according to the German Civil Code) that was 1.27% as of March 31, 2026. Assuming all the minority holders of currently outstanding Adtran Networks shares were to elect the second option, the Company would be obligated to make aggregate Exit Compensation payments, including guaranteed interest, of approximately €304.4 million or approximately $351.7 million, based on an exchange rate as of March 31, 2026, and reflecting interest accrued through March 31, 2026, during the pendency of the appraisal proceedings discussed below. Shareholders electing the first option of Annual Recurring Compensation may later elect the second option. The opportunity for outside Adtran Networks shareholders to tender Adtran Networks shares in exchange for Exit Compensation had been scheduled to expire on March 16, 2023. However, due to the appraisal proceedings that were initiated in 2023 in accordance with applicable German law, this time period for tendering shares has been extended pursuant to the German Stock Corporation Act (*Aktiengesetz*) and will end two months after the date on which a final decision in such appraisal proceedings has been published in the Federal Gazette (*Bundesanzeiger*). Following the court's decision on a procedural matter in the DPLTA appraisal proceedings on July 14, 2025, the proceeding for the trial on the merits of the DPLTA has recommenced. It is expected to take a minimum of 12 months for

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a ruling of the court on the merits and such ruling will most likely be appealed, which would be expected to take an additional 12-24 months to be resolved. Accordingly, the Company does not expect a final decision on the DPLTA appraisal proceedings to be rendered and published prior to 2027, and most likely not until 2028 or beyond.

Our obligation to pay Annual Recurring Compensation under the DPLTA is a continuing payment obligation, which will amount to approximately €7.8 million (or $9.0 million based on the current exchange rate) per year assuming none of the minority Adtran Networks shareholders were to elect Exit Compensation. The foregoing amounts do not reflect any potential increase in payment obligations that we may have depending on the outcome of ongoing appraisal proceedings in Germany. The Annual Recurring Compensation is due on the third banking day following the ordinary general shareholders' meeting of Adtran Networks for the respective preceding fiscal year (but in any event within eight months following expiration of the fiscal year). With respect to the 2025 fiscal year, Adtran Networks' ordinary general shareholders meeting is scheduled for the second quarter of 2026, and the Annual Recurring Compensation will be due on the third banking day following the meeting. During the three months ended March 31, 2026 and 2025, we accrued $2.2 million and $2.4 million, respectively, in Annual Recurring Compensation, which was reflected as an increase to retained deficit.

For the three months ended March 31, 2026, approximately 0.2 million shares of Adtran Networks stock were tendered to the Company and Exit Compensation of €3.6 million or approximately $4.1 million are to be settled in cash in April 2026. For the three months ended March 31, 2025, less than one thousand shares of Adtran Networks stock were tendered to the Company and exit compensation payments of €12 thousand or $13 thousand based on the applicable exchange rates at the time of the transaction were paid to Adtran Networks shareholders.

In addition, under the DPLTA, subject to certain limitations pursuant to applicable law and the specific terms of the DPLTA, (i) the Company is entitled to issue binding instructions to the management board of Adtran Networks, (ii) Adtran Networks will transfer its annual profit to the Company, subject to, among other things, the creation or dissolution of certain reserves, and (iii) the Company will absorb the annual net loss incurred by Adtran Networks. The Company's payment obligation in satisfaction of the requirement that it absorb Adtran Networks' annual net loss applies to the net loss generated by Adtran Networks in 2025 and it will apply to any net loss generated by Adtran Networks in 2026.

*Performance Bonds*

Certain contracts, customers and jurisdictions in which we do business require us to provide various guarantees of performance such as bid bonds, performance bonds and customs bonds. As of March 31, 2026 and December 31, 2025, we had commitments related to these bonds totaling $22.2 million and $22.4 million, respectively, which expire at various dates through April 2029. In general, we would only be liable for the amount of these guarantees in the event of default under each contract, the probability of which we believe is remote.

*Purchase Obligations*

The Company purchases components from a variety of suppliers and uses contract manufacturers to provide manufacturing services for our products. Our inventory purchase obligations are for product manufacturing requirements, as well as for commitments to suppliers to secure manufacturing capacity. Certain of our inventory purchase obligations with contract manufacturers and suppliers relate to arrangements to secure supply and pricing for certain product components for multi-year periods. As of March 31, 2026, purchase obligations totaled $223.7 million.

*Tariff Refund*

On February 20, 2026, the U.S. Supreme Court issued a ruling striking down certain tariffs previously imposed under the International Emergency Economic Powers Act ("IEEPA"). The ultimate availability, timing, and amount of any potential refunds of such tariffs remain highly uncertain and are subject to further legal, regulatory, and administrative developments. Following the Supreme Court's decision, the U.S. presidential administration announced its intention to invoke other laws to collect tariffs and announced new tariffs on imports from all countries, in addition to any existing non-IEEPA tariffs (including tariffs on semiconductors, which are expected to increase in June 2027).

The Company has concluded that the potential refund of IEEPA tariffs should be evaluated under a loss recovery model pursuant to Accounting Standards Codification ("ASC") 410-30. The tariffs at issue were previously capitalized to inventory and subsequently expensed through cost of goods sold. Accordingly, any refund represents a recovery of previously recognized costs, and recognition is limited to amounts previously recorded.

Under the loss recovery model, an asset for recovery may be recognized only when receipt is considered probable, as defined under ASC 450-20. While the Supreme Court ruling establishes a legal basis for recovery, material uncertainty remains regarding the administrative process required to obtain refunds. The U.S. Customs and Border Protection ("CBP") system became operational on April 20, 2026.

Given the lack of clarity surrounding refund execution to determine expected recovery amount, the Company has concluded that recovery of the IEEPA tariffs is not probable as of the reporting date. Accordingly, no refund receivable has been recognized. Management will continue to monitor developments, including CBP implementation milestones, formal guidance on claim submission, and claim acceptance processes.

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Additionally, Adtran may owe money to customers depending on final assessments of contractual or implicit passthrough obligations. The Company will continue to monitor developments related to both refund recoverability and customer refund considerations and will update its accounting conclusions in future periods as facts and circumstances evolve.

*401(k) Plan Corrective Action*

In June 2024, the Company identified that within our Adtran, Inc. 401(k) plan for the year ended 2023, that deferrals and matching contributions should have been applied to vested equity award amounts in accordance with the plan documents. As such, we filed a voluntary correction program ("VCP") application with the IRS and the Company is still in negotiations with the IRS regarding the appropriate corrective actions for this failure. Nonetheless, based on the current facts and circumstances surrounding the VCP negotiations, the Company accrued $1.4 million during the year ended December 31, 2025.

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**<u>ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF</u> <u>FINANCIAL CONDITION AND RESULTS OF OPERATIONS</u>** 

*The following discussion should be read in conjunction with the Condensed Consolidated Financial Statements and the related notes that appear in Part I, Item 1 of this document. In addition, the following discussion should be read in conjunction with our audited consolidated financial statements for the year ended December 31, 2025, Part II, Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations, Part I, Item 1A, Risk Factors, and Part I, Item 1, Business, to our Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on February 26, 2026 (the "2025 Form 10-K").* 

*This discussion is designed to provide the reader with information that will assist in understanding our Condensed Consolidated Financial Statements, the changes in certain key items in those financial statements from period to period, and the primary factors that accounted for those changes, as well as how certain accounting principles affect our Condensed Consolidated Financial Statements. See "Cautionary Note Regarding Forward-Looking Statements" on page 5 of this report for a description of important factors that could cause actual results to differ from expected results. See also Part 1, Item 1A, Risk Factors, of the 2025 Form 10-K and Part II, Item 1A, Risk Factors of this Form 10-Q.*

*Unless the context otherwise indicates or requires, references in this Quarterly Report on Form 10-Q to "Adtran", the "Company," "we", "us" and "our" refer to ADTRAN Holdings, Inc. and its consolidated subsidiaries.*

**OVERVIEW**

The Company is a leading global provider of networking and communications platforms, software, systems and services focused on carrier networks, data center interconnect for private enterprise networks and mission critical infrastructure. It is serving a diverse domestic and international customer base in multiple countries that includes Large, Medium and Small Service Providers, alternative Service Providers, such as utilities, municipalities and fiber overbuilders; cable/MSOs; SMBs; distributed enterprises, including Fortune 500 companies with sophisticated business continuity applications; hyper-scalers, neocloud and content providers and data center companies; and federal, state and local government agencies.

Our innovative solutions and services enable voice, data, video and internet-communications across a variety of network infrastructures and are currently in use by millions worldwide. We support our customers through our direct global sales organization and our distribution networks. Our success depends upon our ability to have customers adopt our technology, increase unit volume and market share through the introduction of new products and succeeding generations of products having optimal selling prices and increased functionality as compared to both the prior generation of a product and the products of competitors in order to gain market share. To service our customers and grow revenue, we are continually conducting research and developing new products addressing customer needs and testing those products for the specific requirements of the particular customers. We offer a broad portfolio of flexible software and hardware network solutions and services that enable Service Providers to meet today's service demands while enabling them to transition to the fully converged, scalable, highly-automated, cloud-controlled voice, data, internet and video network of the future. In addition to our global headquarters in Huntsville, Alabama, and our European headquarters in Munich, Germany, we have sales and research and development facilities in strategic global locations.

The Company solely owns ADTRAN, Inc. and is the majority shareholder of Adtran Networks. Adtran is a leading global provider of open, disaggregated networking and communications solutions. Adtran Networks is a global provider of network solutions for data, storage, voice and video services. We believe that the combined technology portfolio can best address current and future customer needs for high-speed connectivity from the network core to the end consumer, especially upon the convergence of solutions at the network edge.

The chief operating decision maker regularly reviews the Company's financial performance based on two reportable segments: (1) Network Solutions and (2) Services & Support. In addition to operating under two reportable segments, the Company also reports revenue across three categories – Subscriber Solutions, Access & Aggregation Solutions and Optical Networking Solutions.

Our Subscriber Solutions portfolio is used by Service Providers to terminate their access services infrastructure at customers' premises while providing an immersive and interactive experience for residential, business and wholesale subscribers. This revenue category includes hardware and software-based products and services. These solutions include our Mosaic One SaaS applications featuring AI driven operations, fiber termination solutions for residential, business and wholesale subscribers, Wi-Fi access solutions for residential and business subscribers, Ethernet switching and network edge virtualization solutions for business subscribers and cloud software solutions covering a mix of subscriber types.

Our Access & Aggregation Solutions are solutions that are used by communications Service Providers to connect residential subscribers, business subscribers and mobile radio networks to the Service Providers' metro network, primarily through fiber-based connectivity. This revenue category includes hardware and software-based products and services. Our solutions within this category are a mix of fiber access and aggregation platforms, precision network synchronization and timing solutions and access orchestration solutions that ensure highly reliable and efficient network performance.

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Our Optical Networking Solutions are used by communications Service Providers, internet content providers and large-scale enterprises to securely interconnect metro and regional networks over fiber. This revenue category includes hardware and software-based products and services. Our solutions within this category include open optical terminals, open line systems, optical subsystems and modules, network infrastructure assurance systems and automation platforms that are used to build high-scale, secure and assured optical networks.

**ADTRAN NETWORKS DOMINATION AND PROFIT AND LOSS TRANSFER AGREEMENT**

The DPLTA between the Company, as the controlling company, and Adtran Networks, as the controlled company, which was executed on December 1, 2022, became effective on January 16, 2023, as a result of its registration with the commercial register (*Handelsregister*) of the local court (*Amtsgericht*) at the registered seat of Adtran Networks (Jena).

Under the DPLTA, subject to certain limitations pursuant to applicable law and the specific terms of the DPLTA, (i) the Company is

entitled to issue binding instructions to the management board of Adtran Networks, (ii) Adtran Networks will transfer its annual profit to the Company, subject to, among other things, the creation or dissolution of certain reserves, and (iii) the Company will absorb the annual net loss incurred by Adtran Networks. The Company's payment obligation in satisfaction of the requirement that it absorb Adtran Networks' annual net loss applied to the net loss generated by Adtran Networks in 2025, and it will apply to any net loss generated by Adtran Networks in 2026.

Additionally, and subject to certain limitations pursuant to applicable law and the specific terms of the DPLTA, the DPLTA provides that Adtran Networks shareholders (other than us) be offered, at their election, (i) to put their Adtran Networks shares to the Company in exchange for compensation in cash of €17.21 per share plus guaranteed interest ("Exit Compensation"), or (ii) to remain Adtran Networks shareholders and receive a recurring compensation in cash of €0.52 per share for each full fiscal year of Adtran Networks ("Annual Recurring Compensation"). The guaranteed interest component under the Exit Compensation is calculated from the effective date of the DPLTA to the date the shares are tendered, less any Annual Recurring Compensation paid. The guaranteed interest rate is 5.0% plus a variable component that was 1.27% as of March 31, 2026. The Annual Recurring Compensation is due on the third banking day following the ordinary general shareholders' meeting of Adtran Networks for the respective preceding fiscal year (but in any event within eight months following expiration of the fiscal year). With respect to the 2025 fiscal year, Adtran Networks' ordinary general shareholder meeting is scheduled for the second quarter of 2026, and the Annual Recurring Compensation will be due on the third banking day following the meeting. The adequacy of both forms of compensation has been challenged by minority shareholders of Adtran Networks via court-led appraisal proceedings under German law, and it is possible that the courts in such appraisal proceedings may adjudicate a higher Exit Compensation or Annual Recurring Compensation (including interest thereon) than agreed upon in the DPLTA.

The opportunity for outside Adtran Networks shareholders to tender Adtran Networks shares in exchange for Exit Compensation had been scheduled to expire on March 16, 2023. However, due to the appraisal proceedings that were initiated in 2023 in accordance with applicable German law, this time period for tendering shares has been extended pursuant to the German Stock Corporation Act (*Aktiengesetz*) and will end two months after the date on which a final decision in such appraisal proceedings has been published in the Federal Gazette (*Bundesanzeiger*). Following the court's decision on a procedural matter in the DPLTA appraisal proceedings on July 14, 2025, the trial on the merits of the DPLTA has recommenced. It is expected to take a minimum of 12 months for a ruling of the court on the merits and such ruling will most likely be appealed, which would be expected to take an additional 12-24 months to be resolved. Accordingly, the Company does not expect a final decision on the DPLTA appraisal proceedings to be rendered and published prior to 2027, and most likely not until 2028 or beyond.

For the three months ended March 31, 2026, approximately 0.2 million shares of Adtran Networks stock were tendered to the Company and Exit Compensation of €3.6 million or approximately $4.1 million are to be settled in cash in April 2026. For the three months ended March 31, 2025, less than one thousand shares of Adtran Networks stock were tendered to the Company and exit compensation payments of €12 thousand or $13 thousand based on the applicable exchange rates at the time of the transaction were paid to Adtran Networks shareholders.

In summary, the Company believes that its cash and cash equivalents, working capital management initiatives and availability to access cash under the Wells Fargo credit facility or other future sources of capital will be adequate to meet our business operating requirements, our capital expenditures and our expected obligations under both the Notes and the DPLTA, including anticipated levels of Exit Compensation, as well as to support our ability to continue to comply with our debt covenants under the Credit Facility for at least the next twelve months, from the issuance of the consolidated financial statements included in Part I, Item 1 of this Q. *See Note 10, Credit Agreements, for additional information regarding the terms of the Amendments of the Credit Agreement.*

We currently hold 37,047,086 no-par value bearer shares of Adtran Networks, representing 71.2% of Adtran Networks outstanding shares as of March 31, 2026.

The foregoing description of the DPLTA does not purport to be complete and is qualified in its entirety by reference to the DPLTA, a non-binding English translation of which is incorporated by reference to [<u>Exhibit 10.14</u>](https://www.sec.gov/Archives/edgar/data/926282/000119312522298171/d370987dex101.htm) included in our 2025 Form 10-K.

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**FINANCIAL PERFORMANCE AND TRENDS**

We ended the first quarter of 2026 with a year-over-year revenue increase of 15.5% as compared to the three months ended March 31, 2025, driven by increased volume of sales activity and continued strength of our core markets, due to broadband expansion brought about by higher service provider spending, continued vendor consolidation due to a shift away from high-risk vendors. During the first quarter of 2026, we had one customer with revenues greater than 10.0%, which was an international Service Provider customer and our five largest customers comprised 28.7% of our revenue. Our year-over-year domestic revenue increased by 41.6% due to continued customer spending and broadband expansion. Internationally, our year-over-year revenue decreased by 3.2%, primarily driven by the timing of sales with an international Service Provider customer. Our Access & Aggregation, Subscriber Solutions and Optical Networking revenue categories all experienced increased volume of sales activity due to growth across most product lines, and the continued expansion of our customer base.

Our operating results improved due to continuing strong demand, improving margins and disciplined approach to controlling operational expenses. In addition, we continue to support our customer demand for our products by working with our suppliers, contract manufacturers, distributors, and customers to address and to limit potential disruptions to our operations and order fulfillment. Moreover, maintaining sufficient inventory levels to assure prompt delivery of our products increases the amount of inventory that may become obsolete and increases the risk that the obsolescence of this inventory may have an additional adverse effect on our business and operating results beyond the effects of the most recent inventory write-downs. On the other hand, not maintaining sufficient inventory levels to ensure prompt delivery of our products may cause us to incur expediting costs to meet customer delivery requirements, which may negatively impact our operating results.

***Trade Policy/Tariffs***

During 2025, the U.S. introduced trade policy actions that have increased import tariffs across a wide range of countries at various rates, with certain exemptions. On February 20, 2026, the U.S. Supreme Court issued a ruling striking down certain tariffs previously imposed under the International Emergency Economic Powers Act ("IEEPA"). The ultimate availability, timing, and amount of any potential refunds of such tariffs remain highly uncertain and are subject to further legal, regulatory, and administrative developments. See 'Tariff Refund" below for further discussion of the tariff refunds. Following the Supreme Court's decision, the U.S. presidential administration announced its intention to invoke other laws to collect tariffs and announced new tariffs on imports from all countries, in addition to any existing non-IEEPA tariffs (including tariffs on semiconductors, which are expected to increase in June 2027). On April 2, 2026, President Trump further amended the copper, steel and aluminum tariffs issued under Section 232 of the Trade Expansion Act (TEA). The amended tariffs include a 50% tariff on raw copper, steel and aluminum, a flat 25% tariff on derivative products made with greater than 15% of copper, steel or aluminum, and a 15% tariff until 2027 on certain metal-intensive industrial equipment and electrical grid equipment. Derivative products with less than 15% of copper, steel or aluminum will no longer be subject to tariffs and if derivative products are made with U.S. copper, steel or aluminum, the tariff is lowered to a 10% tariff. The new tariff regime for copper, steel and aluminum became effective on April 6, 2026. Furthermore, recent U.S. trade actions have triggered retaliatory actions by certain affected countries, and other foreign governments may impose further trade measures, including reciprocal tariffs, on certain U.S. goods in the future. There remains substantial uncertainty regarding the duration of existing and newly announced tariffs, potential changes or pauses to such tariffs, tariff levels, and whether further additional tariffs or other retaliatory actions may be imposed, modified, or suspended, and the impacts of such actions on our business. These changes in U.S. trade policy and subsequent retaliatory actions have the potential to materially alter various input costs for the Company. Moreover, related costs and the uncertainty arising from such changes in trade policy may result in shifts in customer behavior, such as decreased demand. These impacts could have a negative effect on our financial results, including our revenue and profitability. To help mitigate this, we have taken steps to diversify our supply chain, manufacturing locations and relationships with suppliers to give us added flexibility. For example, beginning in the first quarter of 2026 our suppliers became able to ship products directly to a free trade zone which opened at our Huntsville, Alabama facility. See "Changes in trade policy in the U.S. and other countries, including the imposition of additional tariffs and the resulting consequences, may adversely impact our gross profits, gross margins, results of operations and financial condition," in Part II, Item 1A "Risk Factors" of this report for further discussion of the risks associated with the changes to U.S. and foreign trade policies.

***Tariff Refund***

The Company has concluded that the potential refund of IEEPA tariffs should be evaluated under a loss recovery model pursuant to Accounting Standards Codification ("ASC") 410-30. The tariffs at issue were previously capitalized to inventory and subsequently expensed through cost of goods sold. Accordingly, any refund represents a recovery of previously recognized costs, and recognition is limited to amounts previously recorded.

Under the loss recovery model, an asset for recovery may be recognized only when receipt is considered probable, as defined under ASC 450-20. While the Supreme Court ruling establishes a legal basis for recovery, material uncertainty remains regarding the administrative process required to obtain refunds. The U.S. Customs and Border Protection ("CBP") system became operational on April 20, 2026.

Given the lack of clarity surrounding refund execution to determine expected recovery amount, the Company has concluded that recovery of the IEEPA tariffs is not probable as of the reporting date. Accordingly, no refund receivable has been recognized.

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Management will continue to monitor developments, including CBP implementation milestones, formal guidance on claim submission, and claim acceptance processes.

Additionally, Adtran may owe money to customers depending on final assessments of contractual or implicit passthrough obligations. The Company will continue to monitor developments related to both refund recoverability and customer refund considerations and will update its accounting conclusions in future periods as facts and circumstances evolve.

***Foreign Currency***

We are exposed to changes in foreign currencies relative to the U.S. dollar, which are references to the differences between the foreign-exchanges rates we use to convert the financial results of our international operations from local currencies into U.S. dollars for financial reporting purposes. This impact of foreign-exchange rate changes is calculated based on the difference between the current period's currency exchange rates and that of the comparable prior period. Our primary exposures to foreign currency exchange rate movements are with the euro and the British pound. As a result of our global operations, our revenue, gross margin, operating expense and operating loss in some international markets has been and may continue to be affected by foreign currency fluctuations.

**EFFECT OF RECENT ACCOUNTING PRONOUNCEMENTS**

*See Note 1 of the Notes to Condensed Consolidated Financial Statements included in Part I, Item 1 of this report for a full description of recent accounting pronouncements, including the expected dates of adoption and estimated effects on results of operations and financial condition, which is incorporated herein by reference.*

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**RESULTS OF OPERATIONS – THREE MONTHS ENDED MARCH 31, 2026, COMPARED TO THE THREE MONTHS ENDED MARCH 31, 2025**

The following table presents selected financial information derived from our Condensed Consolidated Statements of Loss expressed as a percentage of revenue for the periods indicated. Amounts may not foot due to rounding.

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| | | |
|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** |
|  | **March 31,** | **March 31,** |
|  | **2026** | **2025** |
| **Revenue** |  |  |
| &nbsp;&nbsp;&nbsp;Network Solutions | 83.2% | 81.6 |
| &nbsp;&nbsp;&nbsp;Services & Support | 16.8 | 18.4 |
| **Total Revenue** | **100.0** | **100.0** |
| **Cost of Revenue** |  |  |
| &nbsp;&nbsp;&nbsp;Network Solutions | 54.1 | 54.2 |
| &nbsp;&nbsp;&nbsp;Services & Support | 6.4 | 7.4 |
| **Total Cost of Revenue** | **60.5** | **61.6** |
| **Gross Profit** | **39.5** | **38.4** |
| &nbsp;&nbsp;&nbsp;Selling, general and administrative expenses | 19.5 | 20.3 |
| &nbsp;&nbsp;&nbsp;Research and development expenses | 17.7 | 19.7 |
| **Operating Income (Loss)** | **2.2** | **(1.6)** |
| &nbsp;&nbsp;&nbsp;Interest and dividend income | 0.1 | 0.1 |
| &nbsp;&nbsp;&nbsp;Interest expense | (1.5) | (1.9) |
| &nbsp;&nbsp;&nbsp;Net investment loss | (0.3) | (0.7) |
| &nbsp;&nbsp;&nbsp;Other income, net | 0.4 | 0.4 |
| **Income (Loss) Before Income Taxes** | **1.0** | **(3.8)** |
| &nbsp;&nbsp;&nbsp;Income tax (expense) benefit | (0.7) | 0.2 |
| **Net Income (Loss)** | **0.3**% | **(3.6)** |
| **Less: Net Income attributable to non-controlling interest** | **0.8** | **0.9** |
| **Net Loss attributable to ADTRAN Holdings, Inc.** | **(0.5)**% | **(4.5)** |

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***Revenue***

Our revenue increased 15.5% from $247.7 million for the three months ended March 31, 2025, to $286.1 million for the three months ended March 31, 2026, which was driven by increased volume of sales activity and continued strength of our core markets, due to broadband expansion brought about by higher service provider spending and continued vendor consolidation due to a shift away from high-risk vendors. The increase in revenue by category for the three months ended March 31, 2026, was primarily attributable to a $19.1 million increase in Optical Networking Solutions products a $17.8 million increase in Subscriber Solutions products, and a $1.4 million increase in Access & Aggregation revenue. The increase in Optical Networking Solutions products was primarily driven by high-risk vendor displacement across Europe and was helped by increased sales to enterprise, government and internet content provider customers. The increase in Subscriber Solutions products was primarily driven by continued investment in fiber-to-the-home, multi-Gig Wi-Fi 7, and Carrier Ethernet applications. The increase in Access & Aggregation revenue was driven by broad-based strength across the U.S. and Europe.

Network Solutions segment revenue increased 17.7% from $202.2 million for the three months ended March 31, 2025, to $237.9 million for the three months ended March 31, 2026. The increase in Network Solutions revenue for the three months ended March 31, 2026, was due to an increase of $18.4 million in volume of sales activity in Subscriber Solutions products, an increase of $16.3 million in volume of sales activity in Optical Networking Solutions products and an increase of $0.9 million in volume of sales activity in Access & Aggregation products.

Services & Support segment revenue increased 5.8% from $45.5 million for the three months ended March 31, 2025, to $48.1 million for the three months ended March 31, 2026. The increase in revenue for the three months ended March 31, 2026, was primarily attributable a $2.8 million increase in Optical Networking services a $0.4 million increase in Access & Aggregation, partially offset by a $0.6 million decrease for Subscriber Solutions.

U.S. revenue increased by 41.6% from $103.2 million for the three months ended March 31, 2025, to $146.2 million for the three months ended March 31, 2026. The increase in U.S. revenue for the three months ended March 31, 2026, was primarily due to continued customer spending and broadband expansion.

International revenue, which is defined as revenue generated from the Network Solutions and Services & Support segments provided to a customer outside of the U.S., decreased by 3.2% from $144.6 million for the three months ended March 31, 2025 to $139.9 million

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for the three months ended March 31, 2026. International revenue, as a percentage of total revenue, decreased from 58.3% for the three months ended March 31, 2025, to 48.9% for the three months ended March 31, 2026. The decrease in international revenue for the three months ended March 31, 2026, was primarily driven by the timing of sales with an international Service Provider customer. While international revenue has decreased for the three months ended March 31, 2026 and 2025 the mix of our Network Solutions and Services & Support segments as a percentage of total international revenue remains relatively consistent. For the three months ended March 31, 2026, as compared to the three months ended March 31, 2025, changes in foreign currencies relative to the U.S. dollar increased our net revenue by approximately $9.3 million.

Our ADTRAN, Inc. international revenue is largely focused on broadband infrastructure and is consequently affected by the decisions of our customers as to timing for installation of new technologies, expansion of their networks and/or network upgrades. Our international customers must make these decisions in the regulatory and political environment in which they operate – both nationally and, in some instances, regionally – whether of a multi-country region or a more local region within a country. Consequently, while we expect the global trend towards deployment of more robust broadband speeds and access to continue creating additional market opportunities for us, the factors described above may result in pressure on revenue and operating income. Our Adtran Networks international revenue is largely focused on the manufacture and selling of networking solutions that are based on three core areas of expertise: fiber-optic transmission technology (cloud interconnect), cloud access technology for rapid creation of innovative services around the network edge and solutions for precise timing and synchronization of networks. In addition, Adtran Networks' international operations offers a comprehensive portfolio of network design, implementation and maintenance services to assist operators in the deployment of market-leading networks while reducing costs to maintain these networks.

***Cost of Revenue***

As a percentage of revenue, cost of revenue decreased from 61.6% for the three months ended March 31, 2025, to 60.5% for the three months ended March 31, 2026. The decrease in cost of revenue as a percentage of revenue for the three months ended March 31, 2026 was attributable to a 1.0% decrease in material costs as a percentage of revenue as a result of customer and product mix and a 0.2% decrease is labor cost as a percentage of revenue as a result of leveraging fixed costs on higher sales volume. For the three months ended March 31, 2026, as compared to the three months ended March 31, 2025, changes in foreign currencies relative to the U.S. dollar increased our cost of revenue by approximately $5.0 million.

Network Solutions cost of revenue, as a percentage of that segment's revenue, decreased from 66.4% for the three months ended March 31, 2025, to 65.0% for the three months ended March 31, 2026. The decrease in cost of revenue as a percentage of revenue for the three months ended March 31, 2026 was attributable to a 1.0% decrease in material costs as a percentage of revenue as a result of customer and product mix and a 0.4% decrease is labor cost as a percentage of revenue as a result of leveraging fixed costs on higher sales volume.

Services & Support cost of revenue, as a percentage of that segment's revenue, decreased from 40.3% for the three months ended March 31, 2025, to 38.3% for the three months ended March 31, 2026. The decrease in cost of revenue as a percentage of revenue for the three months ended March 31, 2026, was primarily attributable to a 4.5% decrease in material costs partially offset by a 2.1% increase in labor and assembly cost as a percentage of revenue as a result of as a result of customer and product mix.

Services & Support revenue is comprised of network planning and implementation, maintenance, support and cloud-based management services, with network planning and implementation being the largest and fastest growing component in the long-term. Compared to our other services, such as maintenance, support and cloud-based management services, our network planning and implementation services typically utilize a higher percentage of internal and subcontracted engineers, professionals and contractors to perform the work for customers. The additional costs incurred to perform these infrastructure and labor-intensive services inherently result in lower average gross margins as compared to maintenance and support services. Within the Services & Support segment, we do expect variability in gross margins from quarter-to-quarter based on the mix of the services recognized.

***Gross Profit***

As a percentage of revenue, gross profit increased from 38.4% for the three months ended March 31, 2025, to 39.5% for the three months ended March 31, 2026. The increase in gross profit as a percentage of revenue for the three months ended March 31, 2026 was attributable to a 1.0% decrease in material costs as a percentage of revenue as a result of customer and product mix and a 0.2% decrease is labor cost as a percentage of revenue as a result of leveraging fixed costs on higher sales volume. For the three months ended March 31, 2026, as compared to the three months ended March 31, 2025, changes in foreign currencies relative to the U.S. dollar increased our gross profit by approximately $4.3 million.

As a percentage of that segment's revenue, Network Solutions gross profit increased from 33.6% for the three months ended March 31, 2025, to 35.0% for the three months ended March 31, 2026. The increase in gross profit as a percentage of revenue for the three months ended March 31, 2026 was attributable to a 1.0% decrease in material costs as a percentage of revenue as a result of customer and product mix and a 0.4% decrease is labor cost as a percentage of revenue as a result of leveraging fixed costs on higher sales volume.

As a percentage of that segment's revenue, Services & Support gross profit increased from 59.7% for the three months ended March 31, 2025, to 61.7% for the three months ended March 31, 2026. The increase in cost of revenue as a percentage of revenue for the three

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months ended March 31, 2026, was primarily attributable to a 4.5% decrease in material costs partially offset by a 2.1% increase in labor and assembly cost as a percentage of revenue as a result of as a result of customer and product mix.

***Selling, General and Administrative Expenses***

As a percentage of revenue, selling, general and administrative expenses decreased from 20.3% for the three months ended March 31, 2025, to 19.5% for the three months ended March 31, 2026. Selling, general and administrative expenses as a percentage of revenue will generally fluctuate whenever there is a significant fluctuation in revenue for the periods being compared.

Selling, general and administrative expenses increased 11.0% from $50.3 million for the three months ended March 31, 2025, to $55.8 million for the three months ended March 31, 2026. Selling, general and administrative expenses include personnel costs for management, accounting, information technology, human resources, sales and marketing, as well as professional fees, contract services and legal and litigation related costs. The increase in selling, general and administrative expenses was primarily attributable to increased employee-related costs of $3.7 million, increased deferred compensation plan expense of $1.5 million and increased travel related expenses of $0.6 million, partially offset by a decrease in stock-based compensation expense of $0.8 million. For the three months ended March 31, 2026, as compared to the three months ended March 31, 2025, changes in foreign currencies relative to the U.S dollar increased our selling, general and administrative expenses by approximately $2.3 million.

***Research and Development Expenses***

As a percentage of revenue, research and development expenses decreased from 19.7% for the three months ended March 31, 2025, to 17.7% for the three months ended March 31, 2026. Research and development expenses as a percentage of revenue will generally fluctuate whenever there are incremental product development activities or significant fluctuations in revenue for the periods being compared.

Research and development expenses increased 3.9% from $48.9 million for the three months ended March 31, 2025, to $50.8 million for the three months ended March 31, 2026. The increase in research and development expenses for the three months ended March 31, 2026, was primarily attributable to increased employee-related costs of $2.6 million, increased office lease expense of $0.4 million and increased depreciation and amortization expense of $0.4 million partially offset by increased governmental research and development subsidies of $0.8 million and decreased stock-based compensation expense of $0.4 million. For the three months ended March 31, 2026, as compared to the three months ended March 31, 2025, changes in foreign currencies relative to the U.S. dollar increased our research and development expenses by approximately $2.3 million.

Adtran Networks has arrangements with governmental entities for the purpose of obtaining funding for research and development activities. The Company classifies government grants received under these arrangements as a reduction to research and development expenses incurred. For the three months ended March 31, 2026 and 2025, the Company recognized $3.1 million and $2.2 million as a reduction of research and development expense, respectively.

We expect to continue to incur research and development expenses in connection with our new and existing products. We continually evaluate new product opportunities and engage in significant research and product development efforts, which provides for new product development, enhancement of existing products and product cost reductions. We may incur significant research and development expenses prior to the receipt of revenue from a major new product group.

***Interest and Dividend Income***

Interest and dividend income increased from $0.1 million for the three months ended March 31, 2025 to $0.3 million for the three months ended March 31, 2026. The increase in interest and dividend income is primarily attributable to fluctuations in investment balances and an increase in the rate of return on those investments due to interest rate movements.

***Interest Expense***

Interest expense decreased from $4.8 million for the three months ended March 31, 2025, to $4.2 million for the three months ended March 31, 2026. The decrease in interest expense during the three months ended March 31, 2026, was primarily driven by the issuance of the 2030 Notes, which accrues interest at 4.7%, and the repayment of the majority of the Credit Agreement which accrued interest at 8.6% for the three months ended March 31, 2025*. See Note 10 and Note 11 of the Notes to Condensed Consolidated Financial Statements, included in Part I, Item 1 of this report for additional information.*

***Net Investment Loss***

We recognized a net investment loss of $1.7 million for the three months ended March 31, 2025 and a net investment loss of $0.9 million for the three months ended March 31, 2026. The fluctuations in our net investments were primarily attributable to changes in the fair value of our securities recognized during the period. We expect that any future market volatility could result in continued fluctuations in our investment portfolio. *See Note 5 of the Notes to Condensed Consolidated Financial Statements, included in Part I, Item 1 of this report, and "Investing Activities" in "Liquidity and Capital Resources" below for additional information.*

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***Other Income, net***

Other income, net, which primarily consisted of gains and losses on foreign currency transactions and income from excess material sales, increased from income of $0.9 million for the three months ended March 31, 2025 to income of $1.3 million for the three months ended March 31, 2026.

***Income Tax (Expense) Benefit***

The Company's effective tax rate changed from a benefit of 4.2% of pre-tax loss for the three months ended March 31, 2025, to an expense of 67.3% of pre-tax income for the three months ended March 31, 2026 The change in the effective tax rate for the three months ended March 31, 2026, was driven primarily by loss jurisdictions for which the recognition of tax benefits on pre-tax losses incurred during the first quarter of 2026 were limited due to a valuation allowance.

***Net Loss Attributable To Adtran Holdings, Inc.***

As a result of the above factors, net loss attributable to ADTRAN Holdings, Inc. decreased from net loss of $11.3 million for the three months ended March 31, 2025, to a net loss of $1.3 million for the three months ended March 31, 2026.

**LIQUIDITY AND CAPITAL RESOURCES**

***Liquidity***

We generally finance our ongoing business with existing cash, investments, credit arrangements and cash flow from operations to manage our working capital needs. We had a positive cash flow from operating activities of $12.7 million in the three months ended March 31, 2026. We have used, and expect to continue to use, existing cash, credit arrangements and cash generated from operations for working capital and other general corporate purposes, including product development activities to enhance our existing products and develop new products, expand our sales and marketing activities and fund capital expenditures.

As of March 31, 2026, our cash on hand was $88.3 million of which $66.6 million was held by our foreign subsidiaries. As of March 31, 2026 the Company had access to $319.2 million on its Credit Facility for future borrowings based on debt covenant compliance metrics. Generally, we intend to permanently reinvest funds held outside the U.S., except to the extent that any of these funds can be repatriated without withholding tax. As of December 31, 2025, our cash on hand was $95.7 million, of which $87.5 million was held by our foreign subsidiaries.

Under the DPLTA, subject to certain limitations pursuant to applicable law and the specific terms of the DPLTA, (i) the Company is entitled to issue binding instructions to the management board of Adtran Networks, (ii) Adtran Networks will transfer its annual profit to the Company, subject to, among other things, the creation or dissolution of certain reserves, and (iii) the Company will absorb the annual net loss incurred by Adtran Networks. The Company's payment obligation in satisfaction of the requirement that it absorb Adtran Networks' annual net loss applies to the net loss generated by Adtran Networks in 2025, and it will apply to any net loss generated by Adtran Networks in 2026.

Pursuant to the terms of the DPLTA, each Adtran Networks shareholder (other than the Company) has received an offer to elect either (1) to remain an Adtran Networks shareholder and receive from us an Annual Recurring Compensation payment, or (2) to receive Exit Compensation plus guaranteed interest. The guaranteed interest under the Exit Compensation is calculated from the effective date of the DPLTA to the date the shares are tendered, less any Annual Recurring Compensation paid. The guaranteed interest rate is 5.0% plus a variable component (according to the German Civil Code) that was 1.27% as of March 31, 2026. Assuming all the minority holders of currently outstanding Adtran Networks shares were to elect the second option, we would be obligated to make aggregate Exit Compensation payments, including guaranteed interest, of approximately €304.4 million or approximately $351.7 million, based on an exchange rate as of March 31, 2026, and reflecting interest accrued through March 31, 2026, during the pendency of the appraisal proceedings discussed below. Shareholders electing the first option of Annual Recurring Compensation may later elect the second option. The opportunity for outside Adtran Networks shareholders to tender Adtran Networks shares in exchange for Exit Compensation had been scheduled to expire on March 16, 2023. However, due to the appraisal proceedings that were initiated in 2023 in accordance with applicable German law, this time period for tendering shares has been extended pursuant to the German Stock Corporation Act (*Aktiengesetz*) and will end two months after the date on which a final decision in such appraisal proceedings has been published in the Federal Gazette (*Bundesanzeige*r). Following the court's decision on a procedural matter in the DPLTA appraisal proceedings on July 14, 2025, the proceeding for the trial on the merits of the DPLTA has recommenced. It is expected to take a minimum of 12 months for a ruling of the court on the merits and such ruling will most likely be appealed, which would be expected to take an additional 12-24 months to be resolved. Accordingly, the Company does not expect a final decision on the DPLTA appraisal proceedings to be rendered and published prior to 2027, and most likely not until 2028 or beyond.

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Additionally, our obligation to pay Annual Recurring Compensation under the DPLTA is a continuing payment obligation, which will amount to approximately €7.8 million or $9.0 million (based on the current exchange rate) per year assuming none of the minority Adtran Networks shareholders were to elect Exit Compensation. The foregoing amounts do not reflect any potential increase in payment obligations that we may have depending on the outcome of ongoing appraisal proceedings in Germany. The Annual Recurring Compensation is due on the third banking day following the ordinary general shareholders' meeting of Adtran Networks for the respective preceding fiscal year (but in any event within eight months following expiration of the fiscal year). With respect to the 2025 fiscal year, Adtran Networks' ordinary general shareholder meeting is scheduled for the second quarter of 2026, and the Annual Recurring Compensation will be due on the third banking day following the meeting. During the three months ended March 31, 2026 and 2025, we accrued $2.2 million and $2.4 million, respectively, in Annual Recurring Compensation which is reflected as an increase to retained deficit.

On July 18, 2022, ADTRAN, Inc., as the borrower, and ADTRAN Holdings, Inc. entered into a credit agreement with a syndicate of banks, including Wells Fargo Bank, National Association, as administrative agent ("Administrative Agent"), and the other lenders named therein ("Credit Agreement"), which has since been amended six times. As of both March 31, 2026 and the date of this filing the Company had access to $319.2 million on its Credit Facility for future borrowings based on debt covenant compliance metrics. The financial covenants under the Credit Agreement, as amended, require the Company to maintain a Consolidated Total Net Leverage Ratio of 5.00x, a Consolidated Senior Secured Net Leverage Ratio of 3.25x (or 4.0x to 3.5x during a Springing Covenant Period), and a Consolidated Fixed Charge Coverage Ratio of 1.25x. In addition, during a Springing Covenant Period the cash and cash equivalents of the credit parties must be at least $50.0 million and the cash and cash equivalents of the Company and its subsidiaries must be at least $70.0 million. The Credit Agreement matures in July 2027. The Company intends to refinance or replace the existing Credit Agreement with a new credit facility during the second quarter of 2026. There can be no assurances that this renewal will occur on terms acceptable to the Company, or at all. *See Note 10, Credit Agreements, of the Notes to Condensed Consolidated Financial Statements in Part 1, Item 1 of this report for additional information regarding the terms of the Wells Fargo Credit Agreement.*

As of March 31, 2026, and as of the date of issuance of the condensed consolidated financial statements included in Part I, Item 1 of this Form 10-Q, the Company has sufficient liquidity through its operating cash flow and the borrowings available under the Credit Facility to meet a majority of its payment obligations under the DPLTA pertaining to Exit Compensation. For the three months ended March 31, 2026, approximately 0.2 million shares of Adtran Networks stock were tendered to the Company and Exit Compensation of €3.6 million or approximately $4.1 million are to be settled in cash in April 2026. For the three months ended March 31, 2025, less than one thousand shares of Adtran Networks stock were tendered to the Company and exit compensation payments of €12 thousand or $13 thousand based on the applicable exchange rates at the time of the transaction were paid to Adtran Networks shareholders. We believe the probability that more than a small minority of Adtran Networks shareholders elect to receive Exit Compensation in the next twelve months is remote based on the following factors: (i) the shareholders can exercise their right to receive the Exit Compensation until two months after publication of the final decision in the appraisal proceedings and we do not expect the final decision to be published within the next 12 months; (ii) the diverse base of shareholders that must make this election on an individual shareholder basis; (iii) the fact that the date of a decision by the court on the merits of the case is uncertain, it will likely take a minimum of 12 months for a ruling on the merits and thereafter, an expected appeal process will take a further 12-24 months to resolve; (iv) the current guaranteed Annual Recurring Compensation payment; and (v) the current trading value of Adtran Networks shares.

In summary, the Company believes that its cash and cash equivalents, working capital management initiatives and availability to access cash under the Wells Fargo Credit Facility (described below) or other future sources of capital, will be adequate to meet our business operating requirements, our capital expenditures and our expected obligations under the DPLTA, including anticipated levels of Exit Compensation and ability to continue to comply with our debt covenants under the Credit Facility for at least the next twelve months, from the issuance of these condensed consolidated financial statements included in Part I, Item 1 of this Form 10-Q. *See Note 10, Credit Agreements, for additional information regarding the terms of the Wells Fargo Credit agreement and Notes to Condensed Consolidated Financial Statements included in Part I, Item, 1 for additional information regarding the terms of the Wells Fargo Credit Agreement.*

***Debt Obligations***

*Wells Fargo Credit Facility*

On July 18, 2022, ADTRAN, Inc., as the borrower ("U.S. Borrower"), and the Company entered into a credit agreement with a syndicate of banks, including Wells Fargo Bank, National Association, as administrative agent ("Administrative Agent"), and the other lenders named therein (the "Original Credit Agreement"), as amended by the First Amendment to Credit Agreement, dated August 9, 2023 ("Amendment No. 1"), the Second Amendment to Credit Agreement, dated January 16, 2024 ("Amendment No. 2"), the Third Amendment to Credit Agreement, dated March 12, 2024 ("Amendment No. 3"), the Fourth Amendment to Credit Amendment, dated June 4, 2024, among Adtran Networks (the "German Borrower") and the parties set forth above ("Amendment No. 4") and the Fifth Amendment to Credit Agreement and Waiver, dated May 6, 2025, among the German Borrower and the parties set forth above ("Amendment No. 5"; the Original Credit Agreement as amended by Amendment No. 1, Amendment No. 2. Amendment No. 3, Amendment No. 4 and Amendment No. 5, the "Existing Credit Agreement").

On September 16, 2025, the U.S. Borrower, the Company, the German Borrower, and the lenders party thereto, including the Administrative Agent, entered into the Sixth Amendment and Consent to Credit Agreement, dated September 16, 2025 ("Amendment

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No. 6"; the Existing Credit Agreement as amended by Amendment No. 6, the "Amended Credit Agreement"). Amendment No. 6, among other things, (i) provides for a consent from the lenders to the issuance by the Company of new unsecured convertible indebtedness in an amount not to exceed $230.0 million, notwithstanding the cap on the amount of Permitted Convertible Indebtedness (as defined in the Amended Credit Agreement) the Company is permitted to incur, (ii) requires that the net cash proceeds of the new unsecured convertible indebtedness be used to (a) repay outstanding revolving credit loans under the Amended Credit Agreement, (b) pay fees, costs, and expenses related to Amendment No. 6 and the issuance of the new unsecured convertible indebtedness and (c) cash collateralize the obligations of the Company and its subsidiaries under the Amended Credit Agreement (with such cash only being permitted to be withdrawn for the purpose of financing the purchase of additional outstanding shares of Equity Interests (as defined in the Amended Credit Agreement) of the German Borrower that were not owned by the Company and its subsidiaries as of August 9, 2023 pursuant to Section 5, paragraph 1 of the DPLTA), and (iii) after the prepayment contemplated in the foregoing clause (ii)(a) and the provision of cash collateral contemplated in the foregoing clause (ii)(c), amends provisions governing the Subline (as defined below) to provide that future prepayments in respect of borrowings under the Subline will no longer permanently reduce the commitments in respect of the Subline.

As of March 31, 2026, the Amended Credit Agreement provided for a secured revolving credit facility of up to $350.0 million of borrowings, $50.0 million of which is solely available to the German Borrower.

As of March 31, 2026, the Company's borrowings under the revolving line of credit were $25.0 million. The credit facilities provided under the Amended Credit Agreement mature in July 2027, but the U.S. Borrower may request extensions subject to customary conditions. In addition, the U.S. Borrower may utilize up to $50.0 million of the $350.0 million total revolving facility for the issuance of letters of credit. As of March 31, 2026, the U.S. Borrower had a total of $5.8 million in letters of credit under the Amended Credit Agreement, leaving a net amount (after giving effect to the $25.0 million of outstanding borrowings described above) of $319.2 million available for future borrowings based on debt covenant compliance metrics. Any future credit extensions under the Amended Credit Agreement are subject to customary conditions precedent. The proceeds of any loans may be used as described above, as well as for working capital and other general corporate purposes.

Moreover, the Amended Credit Agreement provides for a sublimit under the existing $350.0 million revolving commitments in an aggregate amount of $50.0 million ("Subline"), which Subline is available for borrowings by the German Borrower. The Company had no borrowings under the Subline as of March 31, 2026. The existing swing line sublimit and letter of credit sublimit under the Amended Credit Agreement remain available to the U.S. Borrower (and not to the German Borrower). Otherwise, the loans under the Subline are subject to substantially the same terms and conditions under the Amended Credit Agreement (including with respect to the interest rate and maturity date) as the other existing revolving commitments.

All U.S. borrowings under the Amended Credit Agreement bear interest at a rate tied to the Base Rate (as defined in the Amended Credit Agreement) or SOFR, at the Company's option, and all E.U. borrowings bear interest at a rate tied to the Euro Interbank Offered Rate as administered by the European Money Markets Institute (or a comparable or successor administrator approved by the Administrative Agent), in each case plus applicable margins which vary based on the consolidated net leverage ratio of the Company and its subsidiaries as determined pursuant to the terms of the Amended Credit Agreement. Default interest is 2.00% per annum in excess of the rate otherwise applicable. As of March 31, 2026, the weighted average interest rate on our revolving credit agreements was 8.92%.

The Company made certain representations and warranties to the lenders in the Amended Credit Agreement that are customary for credit arrangements of this type. The Company also agreed to maintain a Consolidated Total Net Leverage Ratio of 5.00x, a Consolidated Senior Secured Net Leverage Ratio of 3.25x (4.0x to 3.5x during a "Springing Covenant Period," as defined below) and a Consolidated Fixed Charge Coverage Ratio of 1.25x (as such ratios are defined in the Amended Credit Agreement). A "Springing Covenant Event" occurs when at least sixty percent (60.0%) of the outstanding shares of Adtran Networks that were not owned by the Company and its subsidiaries as of August 9, 2023 have been tendered and purchased by the Company. Upon the occurrence of a Springing Covenant Event, the Company will enter a "Springing Covenant Period", defined as the fiscal quarter in which a Springing Covenant Event occurs and the three (3) consecutive fiscal quarters thereafter. During a Springing Covenant Period, the Company's leverage ratios are increased. In addition, the cash and cash equivalents of the credit parties must be at least $50.0 million and the cash and cash equivalents of the Company and its subsidiaries must be at least $70.0 million. As of March 31, 2026, the Company was in compliance with all covenants.

The Amended Credit Agreement also contains customary events of default, such as misrepresentation and a default in the performance or observance of any covenant (subject to customary cure periods and materiality thresholds). Upon the occurrence and during the continuance of an event of default, the Administrative Agent is entitled to take various actions, including the acceleration of all amounts due under the Amended Credit Agreement.

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All obligations under the Amended Credit Agreement (including under the Subline) are guaranteed by the U.S. Borrower and certain subsidiaries of the U.S. Borrower ("Full Facility Guarantors"). To secure such guarantees, the U.S. Borrower and the Full Facility Guarantors have granted security interests in favor of the Administrative Agent over substantially all of their tangible and intangible assets, and the U.S. Borrower has granted mortgages in favor of the Administrative Agent over certain owned real estate assets. Certain of the German Borrower's subsidiaries (the "Subline Guarantors") have also provided a guarantee solely of the obligations in respect of the Subline. Furthermore, to secure such guarantees, Adtran Networks and the Subline Guarantors have granted security interests in favor of the Administrative Agent over substantially all of their tangible and intangible assets. Upon repayment in full and termination of the Subline, the guarantees by the Subline Guarantors and the liens granted by the German Borrower and the Subline Guarantors to secure obligations under the Subline will be released.

*Convertible Senior Notes*

On September 19, 2025, the Company issued $201.3 million principal amount of 2030 Notes. The 2030 Notes were issued pursuant to, and are governed by, an indenture, dated as of September 19, 2025, between the Company and U.S. Bank Trust Company, National Association, as trustee. In connection with the 2030 Notes, the Company has entered into privately negotiated Capped Calls.

Interest expense related to the 2030 Notes was $2.2 million for the three months ended March 31, 2026. In conjunction with the issuance of the 2030 Notes, the Company recognized debt issuance costs of $8.7 million, which were capitalized as components of the carrying amount and included in convertible senior notes, net within the Consolidated Balance Sheets. *See Note 11 of the Notes to Condensed Consolidated Financial Statements included in Part I, Item 1 of this report for more information.*

***Operating Activities***

Net cash provided by operating activities of $12.7 million during the three months ended March 31, 2026, decreased by $30.5 million compared to net cash provided by operating activities of $43.2 million during the three months ended March 31, 2025.

The following table sets forth adjustments to reconcile net income to net cash provided by operating activities:

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| | |
|:---|:---|
| ***(In thousands)*** | **Three Months Ended<br>March 31, 2026** |
| &nbsp;&nbsp;&nbsp;**Net income** | $**930** |
| &nbsp;&nbsp;&nbsp;Adjustments to reconcile net income to net cash provided by operating activities: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Depreciation and amortization | 24916 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Amortization of debt issuance cost | 374 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Amortization of convertible notes issuance costs | 386 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Loss on investments, net | 822 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net loss on disposal of property, plant and equipment | 60 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stock-based compensation expense | 1819 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deferred income taxes | (244) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Inventory reserves | 143 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes in operating assets and liabilities |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accounts receivable, net | (6192) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other receivables | (3312) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Income taxes receivable, net | 896 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Inventory | 4671 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prepaid expenses, other current assets and other assets | (5558) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accounts payable | 366 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accrued expenses and other liabilities | (9197) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Income taxes payable | 1790 |
| &nbsp;&nbsp;&nbsp;**Net cash provided by operating activities** | $**12670** |

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Quarterly accounts receivable DSO increased from 66 days as of December 31, 2025, to 68 days as of March 31, 2026 and was primarily driven by customer and geographical mix of commercial terms.

The increase in other receivables was primarily attributable to an increase in our receivables for sales of raw materials and contract assets.

Quarterly inventory turnover increased from 2.80 turns as of December 31, 2025, to 3.3 turns as of March 31, 2026. The increase in inventory turnover was primarily attributable to increased volume of sales activity due to continue strength of spending within our core markets and utilization of buffer stock. The decrease in inventory was primarily attributable to increased volume of sales activity due to continue strength of spending within our core markets and utilization of buffer stock. We expect inventory levels to fluctuate as we attempt to maintain sufficient inventory for customer demand and improve working capital.

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Accounts payable will fluctuate due to variations in the timing of the receipt of inventory, supplies and services and our subsequent payments for these purchases.

The decrease in accrued expenses and other liabilities was primarily attributable to the payment of accrued bonuses related to our variable incentive cash compensation program.

***Investing Activities***

Capital expenditures, including intangibles totaled approximately $15.9 million and $18.7 million for the three months ended March 31, 2026 and 2025 respectively. These expenditures were primarily used to purchase computer hardware, internal use software, manufacturing and test equipment, and building improvements. The decrease in capital expenditures for the three months ended March 31, 2026, is primarily attributable to decreases in expenditures related to software and building renovation projects.

Our deferred compensation plan assets decreased 3.9% from $35.2 million as of December 31, 2025, to $33.8 million as of March 31, 2026. Our investments include various marketable equity securities with a fair market value of $0.9 million and $1.0 million as of March 31, 2026, and December 31, 2025. *See Note 5 of the Notes to Condensed Consolidated Financial Statements included in Part I, Item 1 of this report for additional information.*

***Financing Activities***

For the three months ended March 31, 2026, net cash used in financing activities was $1.7 million, which was primarily due to $1.4 million of payments on a financing agreement and $1.6 million of payments of tax withholdings related to stock-based compensation settlements partially offset by $1.4 million proceeds from stock option exercises.

***Stock Repurchase Program***

There were no stock repurchases during the periods ended March 31, 2026, and 2025, and there currently is no authorized stock repurchase program for the repurchase of ADTRAN Holdings, Inc. shares.

***Stock Option Exercises***

To accommodate employee stock option exercises, the Company issued 0.2 million and 0.1 million shares of common stock which resulted in proceeds of $1.4 million and $0.8 million during the three months ended March 31, 2026 and 2025, respectively.

***Pension Plans***

We maintain defined benefit pension plans covering employees in certain foreign countries. *For additional information, see Note 12 of Notes to Condensed Consolidated Financial Statements included in Part I, Item 1 of this report.*

***Deferred Compensation Programs***

We have maintained two deferred compensation programs for certain executive management employees and our Board of Directors. On November 3, 2025 (the "Termination Date"), in an effort to streamline the benefits offered to members of management and other key employees, the Company terminated its Deferred Compensation Program for Employees (the "Deferred Compensation Plan") and its Equity Deferral Program for Employees (the "Equity Deferral Program" together with the Deferred Compensation Plan, the "Plans"). The Company has also terminated its deferred compensation plans for its non-employee directors. The payment of all benefits to each Plan's participants and beneficiaries will be in the form of lump sum or installment distributions which are expected to occur prior to December 31, 2026, but can occur no earlier than twelve (12) months and no later than twenty-four (24) months following the Termination Date (the "Liquidation Date"). Distributions of amounts that are set to occur prior to the Liquidation Date will be made as scheduled under the terms of each Plan. Until the Liquidation Date, each of the Plans will continue to operate in the ordinary course, except that no new deferrals will be credited to the participants for compensation earned after the Termination Date.

The fair value of the assets held by the deferred compensation programs totaled $33.8 million and $35.2 million as of March 31, 2026, and December 31, 2025, respectively, and is included in short-term investments on the Condensed Consolidated Balance Sheets. The amounts payable to the deferred compensation program participants totaled $37.1 million and $37.4 million as of March 31, 2026, and December 31, 2025, respectively. *For additional information, see Note 5 of Notes to Condensed Consolidated Financial Statements included in Part I, Item 1 of this report.*

**Off-Balance Sheet Arrangements** 

We have exposure to credit losses from off-balance sheet exposures, to provide various guarantees of performance such as bid bonds, performance bonds and customs bonds, where we believe the risk of loss is immaterial to our financial statements as of March 31, 2026. Otherwise, we do not have off-balance sheet financing arrangements and have not engaged in any related party transactions or arrangements with unconsolidated entities or other persons that are reasonably likely to materially affect liquidity or the availability of or requirements for capital resources. *See Note 17 of the Notes to Condensed Consolidated Financial Statements, included in Part I, Item 1 of this report for additional information.*

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**Cash Requirements**

The following table summarizes the Company's material short- and long-term cash requirements from known obligations pursuant to certain contracts and commitments as of March 31, 2026, as well as an estimate of the timing in which such obligations and payments are expected to be satisfied (but excluding payments that may be made pursuant to the DPLTA, which is discussed below). Other than operating lease obligations, the cash requirements table excludes interest payments.

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| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| ***(In thousands)*** | **Total** | **2026** | **2027** | **2028** | **2029** | **2030** | **Thereafter** |
| Wells Fargo credit agreement<sup>(1)</sup> | $25000 | $— | $25000 | $— | $— | $— | $— |
| Convertible Senior Notes <sup>(1)</sup> | 201250 |  |  |  |  | 201250 |  |
| Purchase obligations<sup>(2)</sup> | 223661 | 203553 | 15299 | 4743 | 66 |  |  |
| Operating lease obligations<sup>(3)</sup> | 41005 | 6854 | 8405 | 7914 | 4205 | 3187 | 10440 |
| **Totals** | $**490916** | $**210407** | $**48704** | $**12657** | $**4271** | $**204437** | $**10440** |

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(1) See description below.

(2) We have purchase obligations related to open purchase orders to our contract manufacturers, ODMs, component suppliers, service partners and other vendors. The settlement of our purchase obligations will occur at various dates beginning in 2026 and going through 2029. See Note 17 of the Notes to Condensed Consolidated Financial Statements, included in Part I, Item 1 of this report for more information.

(3) We have operating leases for office space, automobiles and various other equipment in the U.S. and in certain international locations. Our operating leases had remaining lease terms ranging from 1 month to 152 months as of March 31, 2026.

***Wells Fargo Credit Agreement***

On July 18, 2022, ADTRAN Holdings, Inc. and ADTRAN, Inc., as the borrower, entered into the Credit Agreement with the Administrative Agent and the other lenders named therein. The Credit Agreement was subsequently amended six times. As of March 31, 2026, the Company's borrowings under the revolving line of credit were $25.0 million. As of March 31, 2026, the Company had access to $319.2 million on its Credit Facility for future borrowings based on debt covenant compliance metrics. The Credit Facility matures in July 2027; however, the Company may request extensions subject to customary conditions. *See Note 10 and 17 of the Notes to Condensed Consolidated Financial Statements, included in Part I, Item 1 of this report and "Liquidity and Capital Resources - Wells Fargo Credit Facility" in Part I, Item 2 of this report for additional information.*

***Convertible Senior Notes***

On September 19, 2025, the Company issued $201.3 million aggregate principal amount of the Notes. The Notes accrue interest at a rate of 3.75% per annum, payable semi-annually in arrears on March 15 and September 15 of each year, beginning March 15, 2026. Unless earlier repurchased, redeemed, or converted, the Notes will mature on September 15, 2030. *See Note 11 of the Notes to Condensed Consolidated Financial Statements, included in Part I, Item 1 of this report and "Liquidity and Capital Resources - Convertible Senior Notes" in Part I, Item 2 of this report for additional information.*

***Receivables Purchase Arrangements*** 

On July 1, 2024, the Company entered into a Factoring Agreement with the Factor, which accelerates receivable collection and helps to better manage cash flow. The Factoring Agreement provides for up to $40.0 million in factoring capacity, subject to eligible receivables and reserve requirements, secured by the receivables. Total accounts receivables factored as of the end of March 31, 2026, totaled $26.1 million of which $3.9 million was retained pursuant to the Factoring Agreement in the reserve account. During the three months ended March 31, 2026 and 2025, the Company received $51.8 million and $31.8 million in cash proceeds from the Factoring Agreement, respectively, which are recorded in operating cash flows on the Condensed Consolidated Statement of Cash Flows. *See Note 2 of the Notes to Condensed Consolidated Financial Statements, included in Part I, Item 1 of this report for additional information.*

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***Adtran Networks Domination and Profit and Loss Transfer Agreement***

The DPLTA between the Company, as the controlling company, and Adtran Networks, as the controlled company, as executed on December 1, 2022, became effective on January 16, 2023, as a result of its registration with the commercial register (*Handelsregister*) of the local court (*Amtsgericht*) at the registered seat of Adtran Networks (Jena).

Under the DPLTA, subject to certain limitations pursuant to applicable law and the specific terms of the DPLTA, (i) the Company is entitled to issue binding instructions to the management board of Adtran Networks, (ii) Adtran Networks will transfer its annual profit to the Company, subject to, among other things, the creation or dissolution of certain reserves, and (iii) the Company will absorb the annual net loss incurred by Adtran Networks. The Company's payment obligation in satisfaction of the requirement that it absorb Adtran Networks' annual net loss applies to the net loss generated by Adtran Networks in 2025, and it will apply to any net loss generated by Adtran Networks in 2026.

Pursuant to the terms of the DPLTA, each Adtran Networks shareholder (other than the Company) has received an offer to elect either (1) to remain an Adtran Networks shareholder and receive from us an Annual Recurring Compensation payment, or (2) to receive Exit Compensation plus guaranteed interest. The guaranteed interest under the Exit Compensation is calculated from the effective date of the DPLTA to the date the shares are tendered, less any Annual Recurring Compensation paid. The guaranteed interest rate is 5.0% plus a variable component (according to the German Civil Code) that was 1.27% as of March 31, 2026. Assuming all the minority holders of currently outstanding Adtran Networks shares were to elect the second option, we would be obligated to make aggregate Exit Compensation payments, including guaranteed interest, of approximately €304.4 million or approximately $351.7 million, based on an exchange rate as of March 31, 2026, and reflecting interest accrued through March 31, 2026, during the pendency of the appraisal proceedings discussed below. Shareholders electing the first option of Annual Recurring Compensation may later elect the second option. The opportunity for outside Adtran Networks shareholders to tender Adtran Networks shares in exchange for Exit Compensation had been scheduled to expire on March 16, 2023. However, due to the appraisal proceedings that were initiated in 2023 in accordance with applicable German law, this time period for tendering shares has been extended pursuant to the German Stock Corporation Act (*Aktiengesetz*) and will end two months after the date on which a final decision in such appraisal proceedings has been published in the Federal Gazette (*Bundesanzeiger*). Following the court's decision on a procedural matter in the DPLTA appraisal proceedings on July 14, 2025, the proceeding for the trial on the merits of the DPLTA has recommenced. It is expected to take a minimum of 12 months for a ruling of the court on the merits and such ruling will most likely be appealed, which would be expected to take an additional 12-24 months to be resolved. Accordingly, the Company does not expect a final decision on the DPLTA appraisal proceedings to be rendered and published prior to 2027, and most likely not until 2028 or beyond.

Additionally, our obligation to pay Annual Recurring Compensation under the DPLTA is a continuing payment obligation, which will amount to approximately €7.8 million or $9.0 million (based on the current exchange rate) per year assuming none of the minority Adtran Networks shareholders were to elect Exit Compensation. The foregoing amounts do not reflect any potential increase in payment obligations that we may have depending on the outcome of ongoing appraisal proceedings in Germany. The Annual Recurring Compensation is due on the third banking day following the ordinary general shareholders' meeting of Adtran Networks for the respective preceding fiscal year (but in any event within eight months following expiration of the fiscal year). With respect to the 2025 fiscal year, Adtran Networks' ordinary general shareholder meeting is scheduled for the second quarter of 2026, and the Annual Recurring Compensation will be due on the third banking day following the meeting. During the three months ended March 31, 2026 and 2025, we accrued $2.2 million and $2.4 million, respectively, in Annual Recurring Compensation. The Annual Recurring Compensation is reflected as an increase to retained deficit in the Condensed Consolidated Balance Sheets.

On October 18, 2022, the Company's Board of Directors authorized the Company to purchase additional shares of Adtran Networks through open market purchases not to exceed 15,346,544 shares. For the three months ended March 31, 2026, approximately 0.2 million shares of Adtran Networks stock were tendered to the Company and Exit Compensation of €3.6 million or approximately $4.1 million are to be settled in cash in April 2026. For the three months ended March 31, 2025, less than one thousand shares of Adtran Networks stock were tendered to the Company and exit compensation payments of €12 thousand or $13 thousand based on the applicable exchange rates at the time of the transaction were paid to Adtran Networks shareholders.

We currently hold 37,047,086 no-par value bearer shares of Adtran Networks, representing 71.2% of Adtran Networks outstanding shares as of March 31, 2026.

The foregoing description of the DPLTA does not purport to be complete and is qualified in its entirety by reference to the DPLTA, a non-binding English translation of which is incorporated by reference to [<u>Exhibit 10.14</u>](https://www.sec.gov/Archives/edgar/data/926282/000119312522298171/d370987dex101.htm) of the 2025 Form 10-K.

***Other Cash Requirements***

During the three months ended March 31, 2026, other than the Exit Compensation payments, Annual Recurring Compensation under the DPLTA, and receivables purchase arrangements, there have been no other material changes in cash requirements from those discussed in the 2025 Form 10-K and our cash requirements table shown in Liquidity and Capital Resources above.

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***Performance Bonds***

Certain contracts, customers and jurisdictions in which we do business require us to provide various guarantees of performance such as bid bonds, performance bonds and customs bonds. As of March 31, 2026, and December 31, 2025, we had commitments related to these bonds totaling $22.2 million and $22.4 million, respectively, which expire at various dates through April 2029. In general, we would only be liable for the amount of these guarantees in the event of default under each contract, the probability of which we believe is remote.

**Critical Accounting Policies and Estimates**

***Accounting Policies***

An accounting policy is deemed to be critical if it requires an accounting estimate to be made based on assumptions about matters that are highly uncertain at the time the estimate is made, if different estimates reasonably could have been used or if changes in the accounting estimate that are reasonably likely to occur could materially impact the results of financial operations. Several accounting policies, as described in Note 1 of Notes to the Condensed Consolidated Financial Statements included in Part I, Item 1 of this report, require material subjective or complex judgment and have a significant impact on our financial condition and results of operations, as applicable. We believe the critical accounting policies affect our more significant judgments and estimates used in the preparation of our Condensed Consolidated Financial Statements. During the three months ended March 31, 2026, there were no significant changes to our critical accounting policies and estimates as described in the financial statements contained in the 2025 Form 10-K.

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**<u>ITEM 3. QUANTITATIVE AND QUALITATI</u><u>VE DISCLOSURES ABOUT MARKET RISK</u>**

We are exposed to financial market risks, including changes in foreign currency rates, prices of marketable equity and fixed-income securities. The primary objective of our investment activities is to preserve principal while at the same time achieving appropriate yields without significantly increasing risk. To achieve this objective, a majority of our marketable securities are investment grade money market instruments denominated in U.S. dollars.

We maintain depository investments with certain financial institutions. As of March 31, 2026, $83.8 million of our cash and cash equivalents, primarily foreign depository accounts, were in excess of government provided insured depository limits. Although these depository investments exceed government insured depository limits, we have evaluated the credit worthiness of these financial institutions and determined the risk of material financial loss due to exposure of such credit risk to be minimal.

*<u>Interest Rate Risk</u>*

As of March 31, 2026, we held $0.6 million of cash and variable-rate investments where a change in interest rates would impact our interest income. A hypothetical 50 basis point decline in interest rates as of March 31, 2026, assuming all other variables remain constant, would reduce annualized interest income on our cash and investments by less than $0.1 million. As of March 31, 2026, the carrying amounts of our revolving credit agreements totaled $25.0 million where a change in interest rates would impact our interest expense. A hypothetical 50 basis point increase in interest rates as of March 31, 2026, assuming all other variables remain constant, would increase our interest expense by $0.1 million. The analyses cover our debt and investments. The analyses use actual or approximate maturities for the debt and investments. The discount rates used were based on the market interest rates in effect at March 31, 2026.

*<u>Foreign Currency Exchange Rate Risk</u>*

We are exposed to changes in foreign currency exchange rates to the extent that such changes affect our revenue and gross margin on revenue derived from some international customers, operating expenses, and assets and liabilities held in non-functional currencies related to our foreign subsidiaries. Our primary exposures to foreign currency exchange rate movements are with the euro and the British pound. Our revenue is primarily denominated in the respective functional currency of the subsidiary and paid in that subsidiary's functional currency or certain other local currency. The majority of our global supply chain predominately makes payments in U.S. dollars and some of our operating expenses are paid in certain local currencies (approximately 43.9% of total operating expense for the quarter ended March 31, 2026). Therefore, our revenue, gross margins, operating expenses and operating loss are all subject to foreign currency fluctuations. As a result, changes in currency exchange rates could cause variations in our operating loss. A hypothetical 10% movement in foreign exchange rates would result in a before-tax positive or negative impact of approximately $0.7 million for the quarter ended March 31, 2026. Actual future gains and losses associated with our foreign currency exposures and positions may differ materially from the sensitivity analyses performed as of March 31, 2026, due to the inherent limitations associated with predicting the foreign currency exchange rates, and our actual exposures and positions.

We have certain customers and suppliers who are invoiced or pay in a non-functional currency. Changes in the monetary exchange rates used to invoice such customers versus the functional currency of the entity billing such customers may adversely affect our results of operations and financial condition. To manage the volatility relating to these typical business exposures, we may enter into various derivative transactions, when appropriate. We do not hold or issue derivative instruments for trading or other speculative purposes. All non-functional currencies billed would result in a combined hypothetical gain or loss of $8.7 million if the U.S. dollar weakened or strengthened 10% against the billing currencies. All non-functional currencies invoiced by suppliers would result in a combined hypothetical gain or loss of $8.3 million if the U.S. dollar weakened or strengthened 10% against the billing currencies. This change represents an increase in the amount of hypothetical gain or loss compared to prior periods and is mainly due to an increase in U.S. dollar denominated billings in a non-U.S. dollar denominated subsidiary.

We have certain assets and liabilities, primarily accounts receivable and accounts payable and lease liabilities that are denominated in currencies other than the relevant entity's functional currency. In certain circumstances, changes in the functional currency value of these assets and liabilities create fluctuations in our reported consolidated financial position, cash flows and results of operations.

For further information about the fair value of our investments as of March 31, 2026, *see Note 5 of the Notes to Condensed Consolidated Financial Statements included in Part I, Item 1 of this report.*

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**<u>ITEM 4. CONTROLS</u> <u>AND PROCEDURES</u>**

*Evaluation of Disclosure Controls and Procedures*

We maintain disclosure controls and procedures that are designed to ensure that the information required to be disclosed by us in reports that we file or submit under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), is recorded, processed, summarized and reported within the time periods specified in the rules and forms promulgated by the SEC, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and our Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

As of the end of the period covered by this report, an evaluation was carried out by management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e)) under the Exchange Act. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that due to the material weaknesses in our internal control over financial reporting described below, our disclosure controls and procedures were not effective as of March 31, 2026.

*Material Weaknesses in Internal Control over Financial Reporting*

A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis. In its assessment of the effectiveness of internal control over financial reporting as of March 31, 2026, management determined that there were deficiencies in Adtran's internal control over financial reporting that constituted material weaknesses that existed as of March 31, 2026. Such material weaknesses were as follows:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Adtran did not design and maintain effective controls in response to the risks of material misstatement. Specifically, changes to existing controls or the implementation of new controls have not been sufficient to respond to changes to the risks of material misstatement to financial reporting. This material weakness contributed to the following additional material weakness.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Adtran did not design and maintain effective controls over financial statement preparation, presentation and disclosure commensurate with its financial reporting requirements. Specifically, Adtran did not design and maintain effective controls over the presentation and disclosure of transactions, including non-controlling interest.

The material weaknesses resulted in the restatements and revision to our consolidated financial statements for the years ended December 31, 2022, 2023 and 2024, as well as the condensed consolidated financial statements for the quarterly and year-to-date periods ended September 30, 2022, March 31, 2023, June 30, 2023, September 30, 2023, March 31, 2024, June 30, 2024 and September 30, 2024. The material weaknesses also resulted in material adjustments that were corrected prior to the issuance of the condensed consolidated financial statements for the quarterly period ended March 31, 2025. Additionally, these material weaknesses could result in misstatements of Adtran's accounts or disclosures that would result in a material misstatement to the annual or interim consolidated financial statements that would not be prevented or detected.

*Management's Remediation Efforts*

To remediate the material weaknesses in Adtran's internal control over financial reporting related to the risks of material misstatement, and financial statement preparation, presentation and disclosure of transactions including non-controlling interest, Adtran has enhanced existing controls over the review of Adtran's consolidated financial statements and in the fourth quarter of 2025 completed the implementation of additional financial statement review controls. We believe these enhanced and additional controls operated effectively through the date of this filing. Adtran's management believes that the continued operation of the activities outlined above in subsequent reporting periods will be effective in remediating such material weaknesses. The material weaknesses cannot be considered remediated until the applicable controls have operated for a sufficient period of time and management has concluded that, through testing, these controls are operating effectively.

Until the remediation steps set forth above, including the implementation of all necessary control activities that we identify, continue to operate effectively for a sufficient amount of time, and there has been time for us to conclude through testing that the control activities have been operating effectively for such time, the material weaknesses described above will not be considered fully remediated.

*Changes in Internal Control over Financial Reporting*

There were no changes in Adtran's internal control over financial reporting that occurred during the most recent fiscal quarter covered by this report that have materially affected, or are reasonably likely to materially affect, its internal control over financial reporting.

------

**PART II. OTHER INFORMATION**

**<u>ITEM 1. LEGAL PROCEEDINGS</u>**

The information presented under the caption "DPLTA Appraisal Proceedings" in Note 17 "Commitments and Contingencies" of the Notes to Consolidated Financial Statements included in Part I, Item 1 of this report is incorporated herein by reference.

**<u>ITEM 1A. RI</u><u>SK FACTORS</u>**

A list of factors that could materially affect our business, financial condition or operating results is described in Part I, Item 1A, "Risk Factors" in the 2025 Form 10-K. There have been no material changes to our risk factors from those disclosed in Part I, Item 1A, "Risk Factors" in the 2025 Form 10-K.

**<u>ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS</u>**

*Sales of Unregistered Securities*

None.

*Issuer Purchases of Equity Securities*

During the three months ended March 31, 2026, we did not repurchase any shares of our common stock. As of March 31, 2026, there is no current authorization to repurchase common stock.

**<u>ITEM 5. OTHER INFORMATION</u>**

*(a) Not applicable*

*(b) Not applicable*

*(c) Insider Trading Arrangements*

During the fiscal quarter ended March 31, 2026, none of the Company's directors or executive officers adopted or terminated any contract, instruction or written plan for the purchase or sale of Company securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any "non-Rule 10b5-1 trading arrangement."

------

**<u>ITEM 6.</u> <u>EXHIBITS</u>** 

Exhibits.

---

| | |
|:---|:---|
| **<u>Exhibit No.</u>** | **Description** |
| 3.1 | [<u>Amended and Restated Certificate of Incorporation of ADTRAN Holdings, Inc. (incorporated by reference to Exhibit 3.1 to the Company's Form 8-K filed July 8, 2022)</u>](https://www.sec.gov/Archives/edgar/data/926282/000119312522190213/d367038dex31.htm) |
| 3.2 | [<u>Second Amended and Restated Bylaws of ADTRAN Holdings, Inc. (incorporated by reference to Exhibit 3.1 to the Company's Form 8-K filed October 24, 2023)</u>](https://www.sec.gov/Archives/edgar/data/926282/000119312523261665/d513183dex31.htm) |
| 10.1 | [<u>Second Amendment to the CEO Employment Agreement, dated April 6, 2026 (incorporated by reference to Exhibit 10.1 to the Company's Form 8-K filed April 7, 2026)</u>](https://www.sec.gov/Archives/edgar/data/926282/000119312526145496/adtn-ex10_1.htm) |
| 10.2 | [<u>Form of 2026 3-Year Performance Shares Agreement under the ADTRAN Holdings, Inc. 2024 Employee Stock Incentive Plan (incorporated by reference to Exhibit 10.2 to the Company's Form 8-K filed April 7, 2026)</u>](https://www.sec.gov/Archives/edgar/data/926282/000119312526145496/adtn-ex10_2.htm) |
| 10.3 | [<u>Form of 2026 CEO 3-Year Performance Shares Agreement under the ADTRAN Holdings, Inc. 2024 Employee Stock Incentive Plan (incorporated by reference to Exhibit 10.3 to the Company's Form 8-K filed April 7, 2026)</u>](https://www.sec.gov/Archives/edgar/data/926282/000119312526145496/adtn-ex10_3.htm) |
| 10.4\* | [<u>Form of 2026 Restricted Stock Unit Agreement under the ADTRAN Holdings, Inc. 2024 Employee Stock Incentive Plan</u>](adtn-ex10_4.htm) |
| 10.5\* | [<u>Form of 2026 CEO Restricted Stock Unit Agreement under the ADTRAN Holdings, Inc. 2024 Employee Stock Incentive Plan</u>](adtn-ex10_5.htm) |
| 31.1\* | [<u>Certification of the Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002</u>](adtn-ex31_1.htm) |
| 31.2\* | [<u>Certification of the Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002</u>](adtn-ex31_2.htm) |
| 32\* | [<u>Section 1350 Certifications</u>](adtn-ex32.htm) |
| 101 | The following financial statements from the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, formatted in Inline XBRL: (i) Condensed Consolidated Balance Sheets as of March 31, 2026 and December 31, 2025; (ii) Condensed Consolidated Statements of Loss for the three months ended March 31, 2026 and 2025; (iii) Condensed Consolidated Statements of Comprehensive (Loss) Income for the three months ended March 31, 2026 and 2025; (iv) Condensed Consolidated Statements of Changes in Equity for the three months ended March 31, 2026 and 2025; (v) Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2026 and 2025; and (vi) Notes to Condensed Consolidated Financial Statements |
| 104 | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) |

---

------

\* Filed herewith.

------

**SIGNATURE**

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

---

| | |
|:---|:---|
|  | **ADTRAN Holdings, Inc.**<br>***(Registrant)*** |
| Date: May 5, 2026 | /s/ Timothy Santo |
|  | Timothy Santo |
|  | Senior Vice President of Finance and <br>Chief Financial Officer |
|  | (Principal Financial Officer and Duly Authorized Officer)<br>|

---

------

## Exhibit 10.4

**Exhibit 10.4**

# ADTRAN HOLDINGS, INC. RESTRICTED STOCK UNIT AGREEMENT
This Restricted Stock Unit Agreement (this "Agreement") sets forth the specified terms of ADTRAN Holdings, Inc.'s grant of the number of Restricted Stock Units ("RSU") as is set forth in the Morgan Stanley StockPlan Connect (the "Portal") to the applicable grantee named in the Portal (the "Participant") pursuant to the ADTRAN Holdings, Inc. 2024 Employee Stock Incentive Plan (the "Plan") as of the date of grant set forth in the Portal. All capitalized terms used but not defined herein shall have the meanings ascribed to such terms in the Plan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.**Satisfaction of Vesting Conditions:**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a.<u>General</u>. Each RSU shall represent the right to receive one share of Common Stock of the Company, subject to the terms and conditions set forth in this Agreement and the Plan. The RSUs shall become vested and nonforfeitable according to the following schedule, measured from the date of grant, assuming the Participant remains in continuous employment with the Company on the applicable date:

---

| | |
|:---|:---|
| **Anniversary of the date of grant:** | **Vested percentage:** |
| One-year anniversary | 25% |
| Two-year anniversary | 25% |
| Three-year anniversary | 25% |
| Four-year anniversary | 25% |

---

Under the above schedule, before the one-year anniversary, no part of the Award is vested or nonforteitable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b.<u>Accelerated Vesting and Delivery</u>. Notwithstanding the foregoing, in the event of

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) the Participant's death or (2) the Participant's Separation from Service due to Disability, all outstanding unvested RSUs shall immediately vest. One share of the Company's Common Stock shall be issued to the Participant for every vested RSU as soon as administratively practicable following the acceleration event.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c.<u>Change of Control</u>. In the event of a Change of Control of the Company and the Participant's involuntary Separation from Service without Cause within twenty-four (24) months following consummation of the Change of Control, all outstanding unvested RSUs shall immediately vest. The RSUs granted herein shall not vest upon a Change of Control in the absence of a Separation from Service without Cause except as may be approved by the Committee.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.**<u>Settlement of the RSUs</u>:** One share of the Company's Common Stock shall be issued to the Participant for every RSU that becomes vested pursuant to the schedule above. The Company will issue shares of Common Stock to the Participant as soon as administratively practicable following the date the applicable portion of the RSUs have become vested; provided, however, if any law or regulation requires the Company to take any action (including, but not limited to, the filing of a registration statement under the Securities Act and causing such registration statement to become effective) with respect to such shares of Common Stock before the issuance thereof, then the date of delivery of the shares shall be extended for the period necessary to take such action, to the maximum extent permitted by Section 409A of the Code. Except as specifically set forth herein or as approved by the Committee, the unvested portion of the RSUs shall be forfeited in the event the Participant incurs a Separation from Service for any reason.

------

![gfx135230890_0.gif](gfx135230890_0.gif)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.**<u>Designation of Beneficiary:</u>** The Participant hereby designates the following individual as the beneficiary of this Agreement:

Participant Name:

Beneficiary Name:

Address:

Relationship:

□Check this box to apply the above beneficiary designation to all prior grants.

To complete this beneficiary designation, this Agreement should be printed out, the information above should then be completed, and the Agreement should then be emailed to Human Resources at [\*\*\*]. The Participant may modify this beneficiary designation by submitting the change in writing to the Company. Beneficiary designations are not effective until received by the Company. If no beneficiary is designated, then except as may be provided in the Plan, any benefits due hereunder following the death of the Participant will be paid to the Participant's estate.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.**<u>Miscellaneous</u>:** The RSUs are granted pursuant to the Plan. The Participant has received a copy of the Plan's prospectus, including a copy of the Plan. The Participant agrees to the terms of this Agreement, which may be amended only upon a written agreement signed by the parties hereto or as otherwise permitted by the Plan. **<u>The Award's date of grant is deemed to be the date that such Award</u> <u>is approved by the Committee or the Chief Executive Officer, as applicable. The Participant is</u> <u>deemed to have accepted this Award unless he or she expressly elects to reject the Award by notifying</u> <u>Human Resources within 30 days of receiving a notice in the portal that the Award has been granted.</u>** Neither this Award nor any terms contained in this Agreement shall (i) confer upon the Participant any express or implied right to be retained in the employment or service of the Company or any affiliate for any period, nor restrict in any way the right of the Company, which right is hereby expressly reserved, to terminate the Participant's employment or service at any time with or without Cause or (ii) entitle the Participant to receive any future equity awards from the Company. Finally, the Participant will have no rights as a stockholder with respect to any shares of Common Stock underlying the Performance Shares unless and until shares are issued and delivered in accordance with Section 2.

If there are any questions regarding this Agreement or the RSUs, please refer to the Plan or contact Human Resources at.

**ADTRAN HOLDINGS, INC.**

![img135230890_0.jpg](img135230890_0.jpg)

Thomas R. Stanton Chief Executive Officer

PARTICIPANT

Name:

------

## Exhibit 10.5

**Exhibit 10.5**

**\* CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE IT IS NOT MATERIAL AND IS THE TYPE OF INFORMATION THE REGISTRANT CUSTOMARILY AND ACTUALLY TREATS AS PRIVATE AND CONFIDENTIAL. REDACTED INFORMATION IS INDICATED BY [\*\*\*].**

# ADTRAN HOLDINGS, INC.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**T. STANTON RESTRICTED STOCK UNIT AGREEMENT**

This Restricted Stock Unit Agreement (this "Agreement") sets forth the specified terms of ADTRAN Holdings, Inc.'s grant of the number of Restricted Stock Units ("RSU") as is set forth in the Morgan Stanley StockPlan Connect (the "Portal") to the applicable grantee named in the Portal (the "Participant") pursuant to the ADTRAN Holdings, Inc. 2024 Employee Stock Incentive Plan (the "Plan") as of the date of grant set forth in the Portal. Unless otherwise specified, all capitalized terms used but not defined herein shall have the meanings ascribed to such terms in the Plan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.**Satisfaction of Vesting Conditions:**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a.<u>General</u>. Each RSU shall represent the right to receive one share of Common Stock of the Company, subject to the terms and conditions set forth in this Agreement and the Plan. The RSUs shall become vested and nonforfeitable according to the following schedule, measured from the date of grant, assuming the Participant remains in continuous employment with the Company on the applicable date:

---

| | |
|:---|:---|
| **Anniversary of the date of grant:** | **Vested percentage:** |
| One-year anniversary | 25% |
| Two-year anniversary | 25% |
| Three-year anniversary | 25% |
| Four-year anniversary | 25% |

---

Under the above schedule, before the one-year anniversary, no part of the Award is vested or nonforteitable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b.<u>Separation from Service</u>. The Participant is a party to that certain Employment Agreement, dated July 13, 2022, by and between Thomas R. Stanton, ADTRAN, Inc., and the Company, as amended (the "Employment Agreement"). In the event that the Participant incurs a Separation from Service, the treatment of any unvested RSUs shall be governed by the Employment Agreement. In the event that the vesting of any RSUs is accelerated upon the Participant's Separation from Service, one share of the Company's Common Stock shall be issued to the Participant for every vested RSU as soon as administratively practicable following such Separation from Service.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c.<u>Change of Control</u>. In the event of a Separation from Service following a Change of Control, the treatment of the RSUs shall be governed by the Employment Agreement. The RSUs granted herein shall not vest upon a Change of Control in the absence of a Separation from Service except as may be approved by the Committee.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.**<u>Settlement of the RSUs</u>:** One share of the Company's Common Stock shall be issued to the Participant for every RSU that becomes vested pursuant to the schedule above. The Company will issue shares of Common Stock to the Participant as soon as administratively practicable following the date the applicable portion of the RSUs have become vested; provided, however, if any law or regulation requires the Company to take any action (including, but not limited to, the filing of a registration statement under

------

![gfx136154411_0.gif](gfx136154411_0.gif)

the Securities Act and causing such registration statement to become effective) with respect to such shares of Common Stock before the issuance thereof, then the date of delivery of the shares shall be extended for the period necessary to take such action, to the maximum extent permitted by Section 409A of the Code.

Except as specifically set forth herein, as specified by the terms of the Employment Agreement, or as approved by the Committee, the unvested portion of the RSUs shall be forfeited in the event the Participant incurs a Separation from Service for any reason.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.**<u>Designation of Beneficiary:</u>** The Participant hereby designates the following individual as the beneficiary of this Agreement:

Participant Name:

Beneficiary Name:

Address:

Relationship:

□Check this box to apply the above beneficiary designation to all prior grants.

To complete this beneficiary designation, this Agreement should be printed out, the information above should then be completed, and the Agreement should then be emailed to Human Resources at [\*\*\*]. The Participant may modify this beneficiary designation by submitting the change in writing to the Company. Beneficiary designations are not effective until received by the Company. If no beneficiary is designated, then except as may be provided in the Plan, any benefits due hereunder following the death of the Participant will be paid to the Participant's estate.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.**<u>Miscellaneous</u>:** The RSUs are granted pursuant to and are subject to the terms of the Plan. The Participant has received a copy of the Plan's prospectus, including a copy of the Plan. **<u>The Award's</u> <u>date of grant is deemed to be the date that such Award is approved by the Committee, which date is</u> <u>reflected in the Portal. The Participant is deemed to have accepted this Award unless he or she</u> <u>expressly elects to reject the Award by notifying Human Resources within 30 days of receiving a</u> <u>notice in the portal that the Award has been granted</u>.** In the event of any conflict between the terms of this Agreement and the terms of the Employment Agreement with respect to the impact of a Separation from Service on this Award, the terms of the Employment Agreement shall control. Furthermore, the Employment Agreement shall be considered part of this Agreement (and therefore an Award Agreement) for purposes of the Plan and shall be considered approved by the Committee for purposes of the Plan. Neither this Award nor any terms contained in this Agreement shall (i) confer upon the Participant any express or implied right to be retained in the employment or service of the Company or any affiliate for any period, nor restrict in any way the right of the Company, which right is hereby expressly reserved, to terminate the Participant's employment or service at any time with or without Cause or (ii) entitle the Participant to receive any future equity awards from the Company. Finally, the Participant will have no rights as a stockholder with respect to any shares of Common Stock underlying the Performance Shares unless and until shares are issued and delivered in accordance with Section 2.

------

If there are any questions regarding this Agreement or the RSUs, please refer to the Plan or contact Human Resources at [\*\*\*].

**ADTRAN HOLDINGS, INC.**

By: [Name of Officer] Title: [Title of Officer]

PARTICIPANT

Name:

------

## Exhibit 31.1

**Exhibit 31.1**

**<u>CERTIFICATIONS</u>**

I, Thomas R. Stanton, certify that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. I have reviewed this Quarterly Report on Form 10-Q of ADTRAN Holdings, Inc.;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's Board of Directors (or persons performing the equivalent functions):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: May 5, 2026

---

| |
|:---|
| /s/ Thomas R. Stanton |
| Thomas R. Stanton |
| Chief Executive Officer and Chairman of the Board<br>(Principal Executive Officer) |

---

------

## Exhibit 31.2

**Exhibit 31.2**

**<u>CERTIFICATIONS</u>**

I, Timothy Santo, certify that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. I have reviewed this Quarterly Report on Form 10-Q of ADTRAN Holdings, Inc.;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's Board of Directors (or persons performing the equivalent functions):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: May 5, 2026

---

| |
|:---|
| /s/ Timothy Santo |
| Timothy Santo |
| Senior Vice President of Finance and Chief Financial Officer<br>(Principal Financial Officer) |

---

------

## Ex-32

**Exhibit 32**

**CERTIFICATION PURSUANT TO**

**18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO**

**SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002**

In connection with the Quarterly Report of ADTRAN Holdings, Inc. (the "Company") on Form 10-Q for the quarter ending March 31, 2026 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Thomas R. Stanton, Chief Executive Officer and Chairman of the Board of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company for the periods described therein.

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|:---|
| /s/ Thomas R. Stanton |
| Thomas R. Stanton |
| Chief Executive Officer and Chairman of the Board<br>(Principal Executive Officer) |

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May 5, 2026

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**CERTIFICATION PURSUANT TO**

**18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO**

**SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002**

In connection with the Quarterly Report of ADTRAN Holdings, Inc. (the "Company") on Form 10-Q for the quarter ending March 31, 2026 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Timothy Santo, Senior Vice President of Finance and Chief Financial Officer, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company for the periods described therein.

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| |
|:---|
| /s/ Timothy Santo |
| Timothy Santo |
| Senior Vice President of Finance and Chief Financial Officer<br>(Principal Financial Officer) |
| May 5, 2026 |

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