OUST

SEC source: 0001193125-26-129505 · ownership.xml · derivative · entry 3

Frichtl Mark · CIK 0001847596 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 276,434

Underlying: Common Stock · 40,000 shares

Expires 2030-10-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The options are fully vested and exercisable.

SEC source: 0001193125-26-129505 · ownership.xml · nonDerivative · entry 2

Frichtl Mark · CIK 0001847596 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 636,882

F1 · shares: Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025. Includes sales made for tax planning purposes.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.53 to $21.30. 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.

SEC source: 0001193125-26-129505 · ownership.xml · nonDerivative · entry 1

Frichtl Mark · CIK 0001847596 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 676,882

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001193125-26-119713 · ownership.xml · nonDerivative · entry 1

Tewksbury Ted L III · CIK 0001375681 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 121,969

F1 · shares: Reflects shares sold pursuant to a Rule 10b5-1 plan dated August 12, 2025. Includes sales made for tax planning purposes.

SEC source: 0001193125-26-108325 · ownership.xml · nonDerivative · entry 1

SPENCER DARIEN · CIK 0001226378 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 325,250

F1 · shares: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.9640 to $23.4522. 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.

SEC source: 0001193125-26-108323 · ownership.xml · nonDerivative · entry 1

Frichtl Mark · CIK 0001847596 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 636,882

F1 · shares: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.9820 to $23.4522. 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.

SEC source: 0001193125-26-108322 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 173,548

F1 · shares: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.9705 to $23.4522. 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.

SEC source: 0001193125-26-108320 · ownership.xml · nonDerivative · entry 1

Pacala Charles Angus · CIK 0001848817 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 960,660

F1 · shares: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.8500 to $23.4522. 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.

SEC source: 0001193125-26-099006 · ownership.xml · nonDerivative · entry 1

Boulet Virginia · CIK 0001202817 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 228,342

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $20.92 to $20.95, inclusive. The Reporting Person undertakes to provide to 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 purchased at each separate price within the range set forth in this footnote.

SEC source: 0001193125-26-018340 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 183,141

F1 · shares: Reflects sale transactions made primarily for tax planning purposes.

SEC source: 0001193125-26-004399 · ownership.xml · nonDerivative · entry 1

Heystee Susan · CIK 0001334330 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,951.7

F1 · shares: 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.

SEC source: 0001193125-25-331041 · ownership.xml · nonDerivative · entry 1

Tewksbury Ted L III · CIK 0001375681 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 123,664

F1 · shares: Reflects shares sold pursuant to a Rule 10b5-1 plan dated August 12, 2025. Includes sales made for tax planning purposes.

SEC source: 0001193125-25-320857 · ownership.xml · nonDerivative · entry 1

Heystee Susan · CIK 0001334330 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,624.7

F1 · shares: Includes sales made for tax planning purposes.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.01 to $25.14. The Reporting Person undertakes to provide Ouster, Inc. (the "Company"), any security holder of the Company, 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.

SEC source: 0001193125-25-320847 · ownership.xml · nonDerivative · entry 1

Frichtl Mark · CIK 0001847596 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 652,571

F1 · shares: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.82 to $24.98663. 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.

F3 · balance_after: Includes 2,829 shares of common stock acquired by the Reporting Person on November 15, 2025, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

SEC source: 0001193125-25-320844 · ownership.xml · nonDerivative · entry 1

SPENCER DARIEN · CIK 0001226378 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 336,188

F1 · shares: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.7757 to $24.98663. 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.

F3 · balance_after: Includes 975 shares of common stock acquired by the Reporting Person on November 15, 2025, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

SEC source: 0001193125-25-320843 · ownership.xml · nonDerivative · entry 1

Pacala Charles Angus · CIK 0001848817 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 985,317

F1 · shares: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.7601 to $24.98663. 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.

SEC source: 0001193125-25-320842 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 188,978

F1 · shares: 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.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.777 to $24.98663. The Reporting Person undertakes to provide Ouster, Inc. (the "Company"), any security holder of the Company, 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.

F3 · balance_after: Includes 2,475 shares of common stock acquired by the Reporting Person on November 15, 2025, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

SEC source: 0001193125-25-314312 · ownership.xml · nonDerivative · entry 2

Eyler Phillip · CIK 0001649301 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,658

F2 · shares: Represents Company 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 18, 2026 or the Company's next 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.

SEC source: 0001193125-25-314312 · ownership.xml · nonDerivative · entry 1

Eyler Phillip · CIK 0001649301 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,683

F1 · shares: 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 as to 1/12 of the total number of RSUs on each of the first twelve quarterly anniversaries of the grant date, 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.

SEC source: 0001193125-25-278302 · ownership.xml · nonDerivative · entry 1

Tewksbury Ted L III · CIK 0001375681 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 125,359

SEC source: 0001193125-25-243555 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 197,199

F1 · shares: Reflects shares sold pursuant to a Rule 10b5-1 trading plan to cover taxes incurred upon the vesting of restricted stock units.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.00 to $31.02. The Reporting Person undertakes to provide Ouster, Inc. (the "Company"), any security holder of the Company, 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.

SEC source: 0001193125-25-232275 · ownership.xml · nonDerivative · entry 1

Heystee Susan · CIK 0001334330 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,274.7

F1 · shares: 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.

SEC source: 0001193125-25-205182 · ownership.xml · nonDerivative · entry 1

SPENCER DARIEN · CIK 0001226378 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 346,132

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units in a trade that was initiated by the Issuer on the Reporting Person's behalf.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.4299 to $29.0101. 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.

SEC source: 0001193125-25-205174 · ownership.xml · nonDerivative · entry 1

Frichtl Mark · CIK 0001847596 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 665,403

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.4299 to $29.0001. 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.

F3 · balance_after: Includes 2,611 shares of common stock acquired by the Reporting Person on May 15, 2025, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

SEC source: 0001193125-25-205170 · ownership.xml · nonDerivative · entry 1

Pacala Charles Angus · CIK 0001848817 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,009,927

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.4299 to $29.0001. 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.

F3 · balance_after: Includes 2,962 shares of common stock acquired by the Reporting Person on May 15, 2025, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

SEC source: 0001193125-25-205161 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 203,035.8

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units in a trade that was initiated by the Issuer on the Reporting Person's behalf.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.4299 to $29.0100. 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.

SEC source: 0000950170-25-109386 · ownership.xml · nonDerivative · entry 1

Heystee Susan · CIK 0001334330 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,264.7

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 to $30.10. The Reporting Person undertakes to provide Ouster, Inc. (the "Company"), any security holder of the Company, 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.

SEC source: 0000950170-25-094769 · ownership.xml · nonDerivative · entry 1

Heystee Susan · CIK 0001334330 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,654.3

F1 · shares: 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.

SEC source: 0000950170-25-088515 · ownership.xml · nonDerivative · entry 2

MADDOCK ERNEST E · CIK 0001227050 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,177

F2 · shares: Represents Company RSUs which immediately vested in full on June 18, 2025.

SEC source: 0000950170-25-088515 · ownership.xml · nonDerivative · entry 1

MADDOCK ERNEST E · CIK 0001227050 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,677

F1 · shares: 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 18, 2026 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0000950170-25-088514 · ownership.xml · nonDerivative · entry 1

Tewksbury Ted L III · CIK 0001375681 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 127,054

F1 · shares: 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 18, 2026 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0000950170-25-088513 · ownership.xml · nonDerivative · entry 1

Correia Christina · CIK 0001966626 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,690

F1 · shares: 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 18, 2026 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0000950170-25-088512 · ownership.xml · nonDerivative · entry 1

BOULET VIRGINIA · CIK 0001202817 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 221,842

F1 · shares: 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 18, 2026 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0000950170-25-088511 · ownership.xml · nonDerivative · entry 1

Heystee Susan · CIK 0001334330 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,942.3

F1 · shares: 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 18, 2026 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0000950170-25-088510 · ownership.xml · nonDerivative · entry 1

SKAGGS STEPHEN A · CIK 0001224172 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,690

F1 · shares: 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 18, 2026 or the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0000950170-25-086713 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 220,218.8

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units in a trade that was initiated by the Issuer on the Reporting Person's behalf.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.7578 to $18.8634. 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.

F3 · balance_after: Includes 2,285 shares of common stock acquired by the Reporting Person on May 15, 2025, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

SEC source: 0000950170-25-086712 · ownership.xml · nonDerivative · entry 1

SPENCER DARIEN · CIK 0001226378 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 364,406

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units in a trade that was initiated by the Issuer on the Reporting Person's behalf.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.7578 to $18.8515. 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.

F3 · balance_after: Includes 900 shares of common stock acquired by the Reporting Person on May 15, 2025, pursuant to the Company's Amended and Restated 2022 Employee Stock Purchase Plan.

SEC source: 0000950170-25-075489 · ownership.xml · nonDerivative · entry 1

Gianella Kenneth P. · CIK 0001677143 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300,000

F1 · shares: Represents Company restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. One-third of the RSUs will vest on June 11, 2026, and the remainder will vest in eight quarterly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.

F1 · price: Represents Company restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. One-third of the RSUs will vest on June 11, 2026, and the remainder will vest in eight quarterly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0000950170-25-071806 · ownership.xml · nonDerivative · entry 1

Heystee Susan · CIK 0001334330 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,384.3

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.02 to $11.46. The Reporting Person undertakes to provide Ouster, Inc. (the "Company"), any security holder of the Company, 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.

SEC source: 0000950170-25-052052 · ownership.xml · nonDerivative · entry 1

Heystee Susan · CIK 0001334330 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 122,403

F1 · shares: 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.

SEC source: 0000950170-25-049684 · ownership.xml · nonDerivative · entry 1

Frichtl Mark · CIK 0001847596 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 688,121

F1 · shares: 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 as to 1/6th of the total number of RSUs underlying the award on each quarterly anniversary of September 11, 2025, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0000950170-25-049694 · ownership.xml · nonDerivative · entry 1

Pacala Charles Angus · CIK 0001848817 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,044,957

F1 · shares: 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 as to 1/6th of the total number of RSUs underlying the award on each quarterly anniversary of September 11, 2025, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0000950170-25-046757 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 220,761.8

F1 · shares: Reflects shares sold pursuant to a Rule 10b5-1 trading plan to cover taxes incurred upon the vesting of restricted stock units.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.24 to $11.245. 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.

SEC source: 0000950170-25-044572 · ownership.xml · nonDerivative · entry 1

Geng Chen · CIK 0002052859 · Interim CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 68,090

F1 · shares: 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 as to 1/6 of the total number of RSUs on each quarterly anniversary of September 11, 2025, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0000950170-25-044573 · ownership.xml · nonDerivative · entry 1

SPENCER DARIEN · CIK 0001226378 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 366,732

F1 · shares: 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 as to 1/6 of the total number of RSUs on each quarterly anniversary of September 11, 2025, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0000950170-25-044563 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 226,562

F1 · shares: 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 as to 1/6 of the total number of RSUs on each quarterly anniversary of September 11, 2025, subject to the reporting person's continued service through the applicable vesting date.

SEC source: 0000950170-25-041473 · ownership.xml · nonDerivative · entry 1

SPENCER DARIEN · CIK 0001226378 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 286,732

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units in a trade that was initiated by the Issuer on the Reporting Person's behalf.

SEC source: 0000950170-25-039503 · ownership.xml · nonDerivative · entry 1

Geng Chen · CIK 0002052859 · Interim CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,090

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units in a trade that was initiated by the Issuer on the Reporting Person's behalf.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.4007 to $7.6323. 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.

SEC source: 0000950170-25-039494 · ownership.xml · nonDerivative · entry 1

Chung Megan · CIK 0001966411 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,562

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock awards in a trade that was initiated by the Issuer on the Reporting Person's behalf.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.4141 to $7.6323. 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.

SEC source: 0000950170-25-039487 · ownership.xml · nonDerivative · entry 1

SPENCER DARIEN · CIK 0001226378 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 286,981

F1 · shares: Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units in a trade that was initiated by the Issuer on the Reporting Person's behalf.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.4008 to $7.6323. 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.