Form 4 Filing for ADTRAN Holdings, Inc.

This filing reports a transaction by THOMAS R STANTON, Chairman & CEO of ADTRAN Holdings, Inc. On April 1, 2026, Mr. Stanton acquired 170,723 shares of Common Stock through a grant of restricted stock units. These units vest in four equal annual installments starting on the first anniversary of the grant. The transaction code is "A," indicating an acquisition. Following this transaction, Mr. Stanton owns 1,126,553.51 shares directly. The reported value of the transaction is $0.00, as it was a stock grant. This event is classified as an OFFICER_DIRECTOR_CHANGE due to the nature of the transaction involving a key executive.