X0609 4 2026-09-14 0001816581 Ouster, Inc. OUST 0001226378 SPENCER DARIEN false 350 TREAT AVENUE SAN FRANCISCO CA 94110 false true false false Chief Operating Officer true Common Stock 2026-09-14 4 S false 12808 33.9595 D 286998.5 D Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units pursuant to a Rule 10b5-1 sale to cover instruction letter dated August 19, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.688 to $33.9661. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Exhibit List - Exhibit 24 - Power of Attorney /s/ Kenneth Gianella, as Attorney-in-Fact for Darien Spencer 2026-09-16