144 0001226378 XXXXXXXX LIVE 0001816581 Ouster, Inc. 001-39463 350 Treat Avenue San Francisco CA 94110 415-949-0108 Darien Spencer Officer Common Stock ETRADE FINANCIAL CORPORATION

3 EDISON DRIVE ALPHARETTA GA 30005

12495 256772.25 62803991 03/12/2026 NASDAQ Common Stock 03/11/2026 Restricted stock units awarded under incentive award plan Issuer N 7000 03/16/2023 Services rendered Common Stock 03/11/2026 Restricted stock units awarded under incentive award plan Issuer N 13333 03/21/2025 Services rendered N Darien Spencer

350 Treat Avenue San Francisco CA 94110

Common Stock 12/12/2025 10919 272734.78 Shares are to be sold to cover withholding taxes upon vesting of restricted stock units. The transaction dated December 12, 2025 reflects the weighted average sale price, with sale prices ranging from $24.7757 to $24.98663. 03/11/2026 08/19/2025 /s/ Megan Chung, as Attorney-in-Fact for Darien Spencer