144 0001848817 XXXXXXXX LIVE 0001816581 Ouster, Inc. 001-39463 350 Treat Avenue San Francisco CA 94110 415-949-0108 Charles Angus Pacala Officer Director Common Stock ETRADE FINANCIAL CORPORATION

3 EDISON DRIVE ALPHARETTA GA 30005

27202 693923.02 60005219 12/12/2025 NASDAQ Common Stock 12/11/2025 Restricted stock units awarded under incentive award plan Issuer N 45833 03/31/2025 Services rendered N Charles Angus Pacala

350 Treat Avenue San Francisco CA 94110

Common Stock 09/12/2025 37992 1081180.14 Shares are to be sold to cover withholding taxes upon vesting of restricted stock units. The transaction dated September 12, 2025 reflects the weighted average price, with sale prices ranging from $28.4299 to $29.0001. 12/11/2025 06/09/2025 /s/ Megan Chung, as Attorney-in-Fact for Charles Angus Pacala