144 0001847596 XXXXXXXX LIVE 0001816581 Ouster, Inc. 001-39463 350 Treat Avenue San Francisco CA 94110 415-949-0108 Mark Frichtl Officer Common Stock ETRADE FINANCIAL CORPORATION

3 EDISON DRIVE ALPHARETTA GA 30005

17922 368297.10 62803991 03/12/2026 NASDAQ Common Stock 03/11/2026 Restricted stock unit awards awarded under incentive award plan Issuer N 29167 04/01/2025 Services rendered N Mark Frichtl

350 Treat Avenue San Francisco CA 94110

Common Stock 12/12/2025 15661 391207.08 Shares are to be sold to cover withholding taxes upon vesting of restricted stock unit awards. The transaction dated December 12, 2025 reflects the weighted average sale price, with sale prices ranging from $24.82 to $24.98663. 03/11/2026 06/09/2025 /s/ Megan Chung, as Attorney-in-Fact for Mark Frichtl