OUST · Ouster, Inc.

The shares received upon exercise remain subject to a lock-up period that expires at the close of business on August 31, 2026, pursuant to the lock-up agreement entered into for the Registrant's offering of common stock that closed on July 6, 2026.

On the Reporting Person's Form 4 dated March 15, 2021 in which this option grant was reported, incentive stock options and non-qualified stock options were reported in the aggregate. All non-qualified stock options have since been exercised, with 100,713 incentive stock options remaining.

The options are fully vested and exercisable.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated May 19, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.01 to $45.865. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated May 19, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.00 to $44.94. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated May 19, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.00 to $46.99. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated May 19, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.05 to $47.115. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated September 8, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.18 to $45.21. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated September 8, 2025.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated November 18, 2025.

Represents shares of common stock received in lieu of cash fees pursuant to the Company's Third Amended and Restated Non-Employee Director Compensation Program.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated August 12, 2025. Includes sales made for tax planning purposes.

Consists of Ouster, Inc. (the "Company") restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. The RSUs vest in quarterly installments through the earlier of June 17, 2027 or the Company's 2027 annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date. The RSUs have no expiration date. The Reporting Person will settle all awards of common stock received, including vested RSUs, upon the earlier of a change in control or separation from service with the Company.

Represents Ouster, Inc. (the "Company") restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. The RSUs vest in quarterly installments through the earlier of June 17, 2027 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

Represents Ouster, Inc. (the "Company") restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. The RSUs vest in quarterly installments through the earlier of June 17, 2027 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

Represents Ouster, Inc. (the "Company") restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. The RSUs vest in quarterly installments through the earlier of June 17, 2027 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

Represents Ouster, Inc. (the "Company") restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. The RSUs vest in quarterly installments through the earlier of June 17, 2027 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

Consists of Ouster, Inc. (the "Company") restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. The RSUs vest in quarterly installments through the earlier of June 17, 2027 or the Company's 2027 annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date. The RSUs have no expiration date. The Reporting Person will settle all awards of common stock received, including vested RSUs, upon the earlier of a change in control or separation from service with the Company.

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 20, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.82 to $39.59. 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.

Includes 284 shares of common stock acquired by the Reporting Person on May 15, 2026, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

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 June 9, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.82 to $39.54. 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.

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 June 9, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.82 to $39.60. 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.

Includes 2,962 shares of common stock acquired by the Reporting Person on May 15, 2026, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

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 $38.82 to $39.54. 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.

Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.82 to $39.54. 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.

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 20, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.82 to $39.54. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated June 13, 2025.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated November 18, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.00 to $45.18. 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.

Includes 991 shares of common stock acquired by Reporting Person on May 15, 2026, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.39 to $41.07. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.39 to $40.38. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.50 to $42.06. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.39 to $39.385. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $36.00 to $36.99. 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.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $37.00 to $37.50. 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.

The options are fully vested and exercisable.

Includes 649 shares of common stock acquired by the Reporting Person on May 15, 2026, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $36.00 to $36.02. 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.

The options are fully vested and exercisable.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated June 13, 2025.

Includes 616 shares of common stock acquired by the Reporting Person on May 15, 2026, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

The options are fully vested and exercisable.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.

Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025.