EQS-Adhoc: Adtran Holdings, Inc.: Preliminary Q2 2025 sales are above the previous forecast span

AD-HOC message in accordance with Article 17 of Regulation (EU) No. 596/2014

Adtran Holdings, Inc.: Preliminary Q2 2025 sales are above the previous forecast span

Huntsville, Alabama (United States of America). July 16 2025 (CT).

As part of the creation of the report for the second quarter of 2025 the Adtran Holdings, Inc. (“Adtran Holdings” or “Society”) (Nasdaq: ADTN; FSE: QH9), the company today determined that the preliminary US GAAP will deviate sales for the second quarter of 2025 from the previous forecast panel.

The deviation from the forecast regarding sales revenues results from improved market conditions during the second quarter of 2025 and growing customer demand for our products and services. The preliminary numbers were as follows:

• The preliminary US GAAP revenues were between $ 262.5 million and $ 267.5 million and thus 0% to 2% above the upper value of the previous forecast span from $ 247.5 million to $ 262.5 million.

The economic framework has continuously improved during the second quarter of 2025 and led to the revenue exceeding the upper end of the previous forecast.

The final financial results for the second quarter of 2025 will be underneath on Monday, August 4, 2025 (Central Time) or before opening the stock exchange on Tuesday, August 5, 2025 (Central European period) https://investors.adtran.com/ published.

The information in this ad hoc message is based exclusively on unchecked results.

Warning on future -oriented statements

The statements contained in this ad hoc report, which do not represent historical facts, are future-oriented statements in the sense of the private Securities Litigation Reform Act from 1995. For future, future-oriented statements are generally also in the use of words such as “faith”, “intended”, “appreciate”, “be”, “can” and similar expressions to recognize. In addition, through his management, Adtran Holdings can make future -oriented public statements on the topics described here from time to time. All such future-oriented information only relates to the date of this ad hoc report and Adtran Holdings is not obliged to publicly update or revise such future-oriented information, unless this is required by law on the basis of new information, future events or other reasons. All such future -oriented statements are necessarily estimates and reflect the best assessment of management based on current information. Due to a variety of factors, actual events or results may differ significantly from those that have been adopted in these future -oriented statements. Although it is impossible to identify all of these factors, factors that have led to this and could lead to the fact that the actual events or results deviate significantly from those estimated by Adtran Holdings, among other things: (i) risks and uncertainties in connection with our ability to comply with the requirements agreed in our loan contract regarding the fulfillment of the payment commitments of the Adtran Networks (“Adtran Networks “) according to the domination and profit transfer agreement between the company and Adtran Networks (” BGAV “) and the performance of payments to Adtran Networks for loss compensation in accordance with BGAV; (II) The risk of sales fluctuations due to lengthy sales and approval processes, which are required by large and other service providers for new products, as well as changing behavior of our customers regarding their expenses; (iii) Risks and uncertainties related to our inventory process and our ability to adapt to customer demand; (IV) Risks and uncertainties related to our degree of fault and our ability to generate liquidity; (v) Risks and uncertainties in connection with persistent significant weaknesses in our internal control of financial reporting; (VI) Risks due to changes in general economic conditions and financial, tax and trade policy, including customs policy; (VII) Risks that arise from potential violations of information systems and cyber attacks; (VIII) The risk that society could not be able to effectively competive, also through product improvements and development; and (IX) other risks, the documents submitted by the company at the US stock exchange authority in the US stock exchange authority in the US stock exchange authority (SEC), including the last published annual report on form 31, 2024 Current version, our quarterly report on Form 10-Q for the quarter report to be submitted to the SEC on March 31, 2025, on form 10-Q for the quarter ended on June 30, 2025.

Furthermore, the financial identifier contained in this ad hoc message is a preliminary estimate subject to our internal controls and procedures and is subject to risks and uncertainties, including, including, including changes in the end of the quarter. Any deviation between the actual financial results of the company and the preliminary span of sales can be significant.

Published by

Adtran Holdings, Inc.

www.adtran.com

For media

Gareth Spence

+44 1904 699 358

[email protected]

Communicative person and investor contact

Peter Schuman, irc

+1 256 963 6305

[email protected]