144 0001334330 XXXXXXXX LIVE 0001816581 Ouster, Inc. 001-39463 350 TREAT AVENUE SAN FRANCISCO CA 94110 (415) 987-6972 Heystee Susan Director COMMON MORGAN STANLEY SMITH BARNEY LLC EXECUTIVE SERVICES

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6400 50112.01 48300000 08/16/2024 NYSE COMMON 03/25/2021 RESTRICTED STOCK ISSUER N 1355 03/25/2021 COMPENSATION COMMON 02/25/2021 RESTRICTED STOCK ISSUER N 5045 02/25/2021 COMPENSATION Y 08/16/2024 /s/ Susan Lynn Heystee