X0306 4 2022-07-01 0 0001101680 DZS INC. DZSI 0001283689 VOGT CHARLES D C/O DZS INC. 5700 TENNYSON PKWY, 4TH FLOOR PLANO TX 75024 1 1 0 0 President & CEO Common Stock 2022-07-01 4 M 0 66666 0.00 A 86708 D Common Stock 2022-07-01 4 F 0 23003 15.97 D 63705 D Restricted Stock Units 2022-07-01 4 A 0 200376 A Common Stock 200376 200376 D Restricted Stock Units 2022-07-01 4 M 0 66666 D Common Stock 66666 133334 D This is the first vesting of the restricted stock units issued on July 1, 2021. Two remaining equal vesting will occur on July 1, 2023 and 2024, subject to the reporting person's continued employment with the issuer on each such vesting date. Each restricted stock unit represents the right to receive on share of the issuer's common stock upon vesting. Shares withheld by DZS to satisfy tax withholding requirements on vesting of restricted stock units. These restricted stock units were granted pursuant to the issuer's 2017 Incentive Award Plan and will vest in three equal installments on July 1, 2023, 2024, and 2025, subject to the reporting person's continued employment with the issuer on each vesting date. Each restricted stock unit represents the right to receive one share of the issuer's common stock upon vesting. /s/Laura Larsen-Misunas as Power of Attorney 2022-07-05