ADTN

EX-99.1

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EX-99.1

EX-99.1

EXHIBIT 99.1

ADTRAN Holdings, Inc. announces certain preliminary second quarter 2026 results

Huntsville, Alabama, USA. – July 21, 2026 — ADTRAN Holdings, Inc. (NASDAQ: ADTN and FSE: QH9) (“ADTRAN Holdings” or the “Company”) today announced preliminary unaudited revenue, preliminary GAAP and non-GAAP operating margin, and preliminary GAAP and non-GAAP basic and diluted earnings per share for the fiscal quarter ended June 30, 2026.

This press release announcement is being provided due to German ad hoc disclosure requirements following, among others, the Company's performance relative to its previously issued revenue guidance. All figures in this release are preliminary and subject to completion of the Company's quarter-end financial close procedures.

For the second quarter of 2026, preliminary revenue is expected to be in the range of $280.0 million to $282.0 million, which is below the Company’s previously announced guidance range of $283.0 million to $303.0 million.

Preliminary GAAP operating margin for the second quarter of 2026 is expected to be between (3.2)% to (4.0)%. Preliminary non-GAAP operating margin for the second quarter is expected to be between 3.5% to 4.0%, which is below our previously announced guidance range of 5.0% to 9.0%.

The Company currently expects second quarter 2026 preliminary GAAP basic and diluted loss per common share attributable to ADTRAN Holdings, Inc. to be between $(0.12) and $(0.14). The Company currently expects second quarter 2026 preliminary non-GAAP basic and diluted earnings per common share attributable to ADTRAN Holdings, Inc. to be between $0.03 and $0.05.

For the third quarter of 2026, the Company expects revenue to be within a range of $275.0 million to $295.0 million. Non-GAAP operating margin is expected to be within a range of 1.5% to 5.5%.

Tom Stanton, Chairman and Chief Executive Officer, said “Our preliminary second quarter results were directly impacted by a project delay from a single customer. In addition, margins reflected the current elevated component and freight cost environment. While these factors are affecting our near-term financial results, they do not change the underlying business, customer engagement or strategic priorities we are executing against.”

“Outside of this customer-specific dynamic, we’re encouraged by the continued strength of our optical networking business, the opportunities we’re seeing with customers and end markets, and the innovation pipeline that continues to expand our addressable market,” Stanton concluded. “We look forward to discussing our second quarter results and the opportunities ahead in greater detail when we report full results in two weeks.”

Quarterly Release and Earnings Call

The information contained in this press release is preliminary. The Company will release its final financial results for the second quarter 2026 after the market close on Monday, August 3, 2026, at https://investors.adtran.com/. The Company will conduct a conference call on Tuesday, August 4, 2026 at 7:30 a.m. Central Time (2:30 p.m. Central European Time).

The Company will webcast this conference call, or you may dial in to participate. To listen, visit the events and presentations section of ADTRAN Holdings, Inc. Investor Relations site at https://events.q4inc.com/attendee/977314034 approximately 10 minutes before the start of the call, or you may dial 1-888-330-2391 (Toll-Free US) or 1-240-789-2702, and use Conference ID 8936454. An online replay of the conference call and a transcript of the call will be available on the Investor Relations site shortly following the call and will remain available for at least 12 months.

The information contained in this press release is solely based on preliminary unaudited results. Non-GAAP operating margin (which is calculated as non-GAAP operating income divided by revenue) is a non-GAAP financial measure. Reconciliations between GAAP operating loss and GAAP operating margin for the second quarter 2026 and non-GAAP operating income and non-GAAP operating margin, respectively, are set forth in the table provided below.

Cautionary Note Regarding Forward-Looking Statements

Statements contained in this press release which are not historical facts are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements can also generally be identified by the use of words such as “believe,” “expect,” “intend,” “estimate,” “anticipate,” “will,” “may,” “could” and similar expressions. Examples of forward-looking statements include, among others, statements regarding management’s expectations with respect to the Company’s final revenue, final

GAAP and non-GAAP operating margin, and final non-GAAP earnings per share for the second quarter 2026, as well as future underlying customer activity and demand trends. In addition, ADTRAN Holdings, through its senior management, may from time to ti

EX-99.1

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EX-99.1

EX-99.1

ADTRAN Holdings, Inc. reports first quarter 2026 financial results

Huntsville, Alabama, USA. — May 4, 2026 — ADTRAN Holdings, Inc. (NASDAQ: ADTN and FSE: QH9) (“ADTRAN Holdings” “ADTRAN” or the “Company”) today announced its unaudited financial results for the first quarter ended March 31, 2026.

• Revenue: $286.1 million, up 15.5% year-over-year.

• GAAP gross margin of 39.5%; Non-GAAP gross margin of 43.0%; up 108 and 55 basis points year-over-year, respectively.

• Operating margin: GAAP operating margin of 2.2 %; non-GAAP operating margin of 6.9%.

• Net cash provided by operating activities of $12.7 million.

• GAAP diluted loss per share of $0.01; non-GAAP diluted earnings per share of $0.14.

• Cash and cash equivalents of $88.3 million.

ADTRAN Holdings Chairman and Chief Executive Officer Tom Stanton stated, “We delivered solid first quarter results, with revenue increasing 15.5% year-over-year, and GAAP and non-GAAP operating margin rising 380 and 300 basis points from a year ago, respectively. These results reflect the continued strength of our core markets and the operating leverage we have been building.”

Mr. Stanton added, “We believe that the demand drivers underpinning our business continue to build. In the US, broadband momentum continues with BEAD deployment funds now beginning to reach operators in a growing number of states. In Europe, high-risk vendor displacement continues to progress, reinforced by the European Commission's advancing legislation such as Cybersecurity Act 2.0. Also during the quarter, we introduced LiteWave800™, our first product purpose-built for intra-data center AI infrastructure, setting a new benchmark for power efficiency at 800G.”

Business outlook1

For the second quarter of 2026, the Company expects revenue to be within a range of $283.0 million to $303.0 million. Non-GAAP operating margin is expected to be within a range of 5.0% to 9.0%.

1 Non-GAAP operating margin (which is calculated as non-GAAP operating income (loss) divided by revenue) is a non-GAAP financial measure. The Company has provided guidance for its second quarter 2026 non-GAAP operating margin. This measure excludes from the corresponding GAAP financial measure the effect of adjustments as described below. The Company has not provided a reconciliation of such non-GAAP guidance to guidance presented on a GAAP basis because it cannot predict and quantify without unreasonable effort all of the adjustments that may occur during the period due to the difficulty of predicting the timing and amounts of various items within a reasonable range. In particular, non-GAAP operating margin excludes certain items, such as acquisition related expenses, amortization and adjustments, stock-based compensation expense, deferred compensation adjustments, professional fees and other expenses, amortization of pension actuarial losses, the tax effect of these adjustments to net loss and purchases of property, plant and equipment, and developed technologies, that the Company is unable to quantitatively predict. Depending on the materiality of these items, they could have a significant impact on the Company's GAAP financial results.

Conference call

The Company will hold a conference call to discuss its first quarter 2026 results on Tuesday , May 5, 2026, at 7:30 a.m. Central Time (2:30 p.m. Central European Time). The Company will webcast this conference call at the events and presentations section of ADTRAN Holdings, Inc. Investor Relations website at https://events.q4inc.com/attendee/656998876 approximately 10 minutes before the start of the call, or you may dial 1-888-330-2391 (Toll-Free US) or 1-240-789-2702, and use Conference ID 8936454.

An online replay of the Company’s conference call, as well as the transcript of the call, will be available on the Investor Relations site https://investors.adtran.com/ shortly following the call and will remain available for at least 12 months. For more information, visit investors.adtran.com or email investor.relations@adtran.com.

Upcoming conference schedule

May 20, 2026: B. Riley Institutional Investor Conference - Marina Del Rey, CA

About Adtran

ADTRAN Holdings, Inc. (NASDAQ: ADTN and FSE: QH9) is the parent company of Adtran, Inc., a leading global provider of open, disaggregated networking and communications solutions that enable voice, data, video and internet communications across any network infrastructure. From the cloud edge to the subscriber edge, Adtran empowers communications service providers around the world to manage and scale services that connect people, places and things. Adtran solutions are used by service providers, private enterprises, government organizations and millions of individual users worldwide. ADTRAN Holdings, Inc. is also the majority shareholder of Adtran Networks SE, formerly ADVA Optical Networking SE (“Adtran Networks”). Find more at Adtran.com, LinkedIn and X.

Cautionary note regardi

8-K

0000926282false00009262822026-02-252026-02-25

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 25, 2026

ADTRAN Holdings, Inc. (Exact name of Registrant as Specified in Its Charter)

Delaware

001-41446

87-2164282

(State or Other Jurisdiction of Incorporation)

(Commission File Number)

(IRS Employer Identification No.)

901 Explorer Boulevard

Huntsville, Alabama

35806-2807

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including Area Code: (256) 963-8000

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, Par Value $0.01 per share

ADTN

Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter). 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. ☐

Item 2.02 Results of Operations and Financial Condition. On February 25, 2026, ADTRAN Holdings, Inc. (“ADTRAN”) announced its financial results for the quarter and fiscal year ended December 31, 2025. A copy of ADTRAN’s press release announcing its financial results is attached as Exhibit 99.1 hereto and incorporated by reference herein. Item 7.01 Regulation FD Disclosure. Executives from ADTRAN will review the financial results via a live audio webcast on Thursday, February 26, 2026, at 7:30 a.m. Central Time, or 2:30 p.m. Central European Time. A copy of the investor presentation provided in connection with that review is attached as Exhibit 99.2 and incorporated by reference herein. An archived recording of the webcast will be available for a limited time on ADTRAN's Investor Relations page at https://investors.adtran.com. The information included in, or incorporated into, Items 2.02 and 7.01 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. Item 9.01 Financial Statements and Exhibits.

Exhibit Number

Description

99.1

Press Release dated February 25, 2026

99.2

Visual Presentation of February 26, 2026

104

Cover Page Interactive Data File – the cover page iXBRL tags are embedded within the Inline XBRL document

SIGNATURES

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

ADTRAN Holdings, Inc.

Date:

February 26, 2026

By:

/s/ Timothy Santo

Timothy Santo Senior Vice President of Finance and Chief Financial Officer