X0306 4 2021-01-04 0 0001101680 DZS INC. DZSI 0001822841 Carbone Barbara C/O DZS INC. 7500 TENNYSON PARKWAY PLANO TX 75024 1 0 0 0 Common Stock 2021-01-04 4 A 0 4275 0.00 A 4275 D Represents restricted stock units issued to the reporting person that will vest in four equal installments on March 31, 2021, June 30, 2021, September 30, 2021 and December 31, 2021, 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 2021-01-06