X0306 4 2022-10-01 0 0001101680 DZS INC. DZSI 0001655819 Ferguson Justin K. C/O DZS INC. 5700 TENNYSON PKWY, 4TH FLOOR PLANO TX 75024 0 1 0 0 Chief Legal Officer Common Stock 2022-10-01 4 M 0 6666 0.00 A 25291 D Common Stock 2022-10-01 4 F 0 2157 11.30 D 23134 D Restricted Stock Units 2022-10-01 4 M 0 6666 D Common Stock 6666 13334 D This represents the first vesting on October 1, 2022 in the amount of 6,666 units for a total amount vested of 6,666 of the restricted stock units issued on October 1, 2021. Two remaining equal vesting will occur on October 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 one share of the issuer's common stock upon vesting. Shares withheld by DZS to satisfy tax withholding requirements on vesting of restricted stock units. /s/Laura Larsen-Misunas as Power of Attorney 2022-10-04