Amendment to Quarterly Report (Form 10-Q/A)

This Amendment No. 1 on Form (this "Amendment") amends the Quarterly Report on Form for Ouster, Inc. ("Company") for the period ended September 30, 2025 filed with the Securities and Exchange Commission on November 5, 2025 (the "Original Filing"). This Amendment is being filed to revise Part II "Item 5. Other Information" by adding one Rule trading arrangement entered into during the quarter ended September 30, 2025 by Theodore L. Tewksbury Ph.D., Chair of the Company's Board of Directors, adopted on August 12, 2025, which was inadvertently omitted from the disclosure included in the Original Filing.

In addition, as required by Rule of the Securities and Exchange Act of 1934, as amended (the "Exchange Act"), new certifications by the Company's principal executive officer and principal financial officer are filed herewith as exhibits to this Amendment, under Part II, Item 6 "Exhibits" hereof, pursuant to Rule or of the Exchange Act. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation paragraphs 3, 4 and 5 of the certifications have been omitted. The Company is also not including new certifications under Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) (Section 906 of the Sarbanes-Oxley Act of 2002, as amended), as no financial statements are being filed with this Amendment.

Other than as expressly set forth herein, this Amendment does not, and does not purport to, amend, update or restate the information in Original Filing or reflect any events that have occurred after the Original Filing was made. Information not affected by this Amendment remains unchanged and reflects the disclosures made at the time as of which the Original Filing was made. No changes have been made to the financial statements of the Company as contained in the Original Filing. Accordingly, this Amendment should be read together with the Original Filing and the Company's other filings with the SEC.