X0306 4 2022-12-31 0 0001101680 DZS INC. DZSI 0001822841 Carbone Barbara C/O DZS INC. 5700 TENNYSON PARKWAY, 4TH FLOOR PLANO TX 75024 1 0 0 0 Common Stock 2022-12-31 4 M 0 973 0.00 A 8712 D Common Stock 2022-12-31 4 M 0 547 0.00 A 9259 D Restricted Stock Units 2022-12-31 4 M 0 973 D Common Stock 973 0 D Restricted Stock Units 2022-12-31 4 M 0 547 D Common Stock 547 0 D Restricted Stock Units 2023-01-03 4 M 0 7806 A Common Stock 7806 7806 D This represents the fourth vesting on December 31, 2022 in the amount of 973 units for a total amount vested of 3,889 of the restricted stock units issued on January 3, 2022. Each restricted stock unit represents the right to receive one share of the issuer's common stock upon vesting. This represents the second vesting on December 31, 2022 in the amount of 547 units for a total amount vested of 1,095 of the restricted stock units issued on July 1, 2022. Each restricted stock unit represents the right to receive one share of the issuer's common stock upon vesting. These restricted stock units were granted pursuant to the issuer's 2017 Incentive Award Plan and will vest in four equal installments on March 31, 2023, June 30, 2023, September 30, 2023 and December 31, 2023, subject to the reporting person's continued service to the issuer on each such vesting date. Each restricted stock unit represents the right to receive one share of the company's common stock upon vesting. /s/Laura Larsen-Misunas as Power of Attorney 2023-01-04