Form 3 Filing for Anne DelSanto

This filing reports the appointment of Anne DelSanto as a Director of ADTRAN Holdings, Inc., effective July 1, 2026. As of her appointment, Ms. DelSanto did not beneficially own any securities or derivative securities of the Company. The filing also includes Exhibit 24, a Limited Power of Attorney, through which Ms. DelSanto grants authority to specific individuals to prepare and file Section 16 reports (Forms 3, 4, and 5) on her behalf with the SEC. This power of attorney authorizes these individuals to act on her behalf in all matters related to these filings, including gathering information and executing necessary documents. It clarifies that neither the Company nor the appointed attorneys-in-fact assume liability for Ms. DelSanto's reporting obligations under Section 16 of the Securities Exchange Act of 1934. The power of attorney revokes any previous similar documents and remains in effect until Ms. DelSanto is no longer required to file these reports or until she revokes it.