Adtran Holdings

Cautionary note regarding forward-looking statements Statements contained in this presentation which are not historical facts, such as those relating to expectations regarding earnings, expenses and margin; the ability of ADTRAN Holdings, Inc. ("ADTRAN Holdings") to reduce expenses in the coming year and the amount there of through its implementation of the business efficiency program; and ADTRAN Holdings' strategy, outlook and financial guidance, 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. In addition, ADTRAN Holdings, through its senior management, may from time to time make forward-looking public statements concerning the matters described herein. All such projections and other forward-looking information speak only as of the date hereof, and ADTRAN Holdings undertakes no duty to publicly update or revise such forward-looking information, whether as a result of new information, future events, or otherwise, except to the extent as may be required by law. All such forward-looking statements are necessarily estimates and reflect management's best judgment based upon current information. Actual events or results may differ materially from those anticipated in these forward-looking statements as a result of a variety of factors. While it is impossible to identify all such factors, factors which have caused and may in the future cause actual events or results to differ materially from those estimated by ADTRAN Holdings include, but are not limited to: (i) risks and uncertainties related to manufacturing and supply chain constraints; (ii) risks and uncertainties related to the completed business combination between the Company, ADTRAN, Inc. ("ADTRAN") and Adtran Networks SE ("Adtran Networks"), including risks related to the ability to successfully integrate ADTRAN's and Adtran Networks' businesses, the disruption of management time from ongoing business operations due to integration efforts following the business combination, and the risk that ADTRAN Holdings may be unable to achieve expected synergies or that it may take longer or be more costly than expected to achieve those synergies; (iii) risks and uncertainties relating to the recent restatement of our previously issued consolidated financial statements and ongoing material weakness in our internal control over financial reporting; (iv) risks and uncertainties relating to ADTRAN Holdings' ability to reduce expenditures and the impact of such reductions on its financial results and financial condition; (v) the risk of fluctuations in revenue due to lengthy sales and approval processes required by major and other service providers for new products, as well as ongoing tighter inventory management of ADTRAN Holdings' customers; (vi) the risk posed by potential breaches of information systems and cyber-attacks; (vii) the risk that ADTRAN Holdings may not be able to effectively compete, including through product improvements and development; and (viii) other risks set forth in ADTRAN Holdings' public filings made with the Securities and Exchange Commission, including its Annual Report on Form 10-K for the year ended December 31, 2022, as amended, as well as its Form 10-Q for the quarter ended June 30, 2023 2 2023 ADTRAN, INC. Adtran

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