X0306 4 2022-07-08 1 0000926282 ADTRAN INC ADTN 0001327057 McCray Gregory James C/O ADTRAN 901 EXPLORER BLVD. HUNTSVILLE AL 35806 1 0 0 0 Common Stock 2022-07-08 4 D 0 21641.798 D 0 D Includes 3,943 shares of time-based restricted stock under a restricted stock award (an "RSA") and 35.53 shares of restricted stock acquired in connection with such RSA pursuant to a dividend reinvestment feature of the applicable equity plan. Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, each share of the Issuer's common stock converted, on a one-for-one basis, into a share of common stock of Holdings. The reporting person's status as a director of the Issuer terminated as of the Effective Time. /s/ Michael Foliano, by power of attorney 2022-07-08