Form 4 Filing for ADTRAN Holdings, Inc. - Officer Transaction

This Form 4 filing reports a transaction by Timothy P. Santo, SVP of Finance and CFO of ADTRAN Holdings, Inc. On April 1, 2026, Mr. Santo acquired 28,252 shares of Common Stock through a restricted stock unit grant that vests over four years. The reported acquisition price was $0.00 per share, and following this transaction, Mr. Santo directly owns 53,345 shares. The grant is subject to vesting conditions as detailed in footnote F1.