144 0001966411 XXXXXXXX LIVE 0001816581 Ouster, Inc. 001-39463 350 Treat Avenue San Francisco CA 94110 415-949-0108 Megan Chung Officer Common Stock ETRADE FINANCIAL CORPORATION

3 EDISON DRIVE ALPHARETTA GA 30005

3491 28207 49770639 03/12/2025 NASDAQ Common Stock 03/11/2025 Restricted stock units awarded under incentive award plan Issuer N 225 08/10/2022 Services rendered Common Stock 03/11/2025 Restricted stock units awarded under incentive award plan Issuer N 2084 01/25/2023 Services rendered Common Stock 03/11/2025 Restricted stock units awarded under incentive award plan Issuer N 463 08/25/2021 Services rendered Common Stock 03/11/2025 Restricted stock units awarded under incentive award plan Issuer N 4500 03/16/2023 Services rendered N Megan Chung

350 Treat Avenue San Francisco CA 94110

Common Stock 12/12/2024 13671 132480.19 Shares to be sold to cover withholding taxes upon vesting of restricted stock award and restricted stock unit award in a trade that will be initiated by the Issuer on the Reporting Person's behalf. 03/11/2025 /s/ Megan Chung