X0306 4/A 2021-03-11 2021-03-15 0 0001816581 Ouster, Inc. OUST 0001186773 HERNANDEZ EMMANUEL T 350 TREAT AVENUE SAN FRANCISCO CA 94110 1 0 0 0 Common Stock 2021-03-11 4 A 0 22696 0.00 A 22696 D Common Stock 2021-03-11 4 A 0 15446 0.00 A 38142 D Reflects an award of restricted stock units ("RSUs"). The RSUs vest as to 1/12 of the the total number of RSUs on each quarterly anniversary of the grant date, The Reporting Person will settle all awards of common stock received, including vested restricted stock units, upon the earlier of a change in control or separation from service with the Issuer. The RSUs were previously reported in Table II. Each RSU represents a contingent right to receive one share of common stock. Reflects an award of RSUs. The RSUs vest as to 25% of the the total number of RSUs on each quarterly anniversary of the grant date, The Reporting Person will settle all awards of common stock received, including vested restricted stock units, upon the earlier of a change in control or separation from service with the Issuer. The RSUs were previously reported in Table II. /s/ Adam Dolinko, Attorney-in-Fact 2022-03-15