Executive Change

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ___________________________________ FORM 8-K ___________________________________ CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 17, 2025 Date of Report (date of earliest event reported) ___________________________________ Rivian Automotive, Inc. (Exact name of registrant as specified in its charter) ___________________________________ Delaware (State or other jurisdiction of incorporation) 001-41042 (Commission File Number) 47-3544981 (IRS Employer Identification Number) 14600 Myford Road Irvine , California 92606 (Address of principal executive offices) (Zip code) ( 888 ) 748-4261 (Registrant's telephone number, including area code) N/A (Former name or former address, if changed since last report) ___________________________________ Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol Name of each exchange on which registered Class A common stock, $0.001 par value per share RIVN The Nasdaq Stock Market Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company     ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ☐ Item 5.02 - Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers On December 17, 2025, Rose Marcario resigned from the Board of Directors (the “Board”) of Rivian Automotive, Inc., effective January 1, 2026, to focus on other commitments. Ms. Marcario will continue to serve as the Chair of the Board of Trustees of the Rivian Foundation. Effective upon Ms. Marcario’s resignation, the size of the Board will be reduced from eight to seven members. We thank Ms. Marcario for her service on the Board and for her continued support of the Rivian Foundation. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. RIVIAN AUTOMOTIVE, INC.     Date: December 19, 2025 By: /s/ Claire McDonough Name: Claire McDonough Title: Chief Financial Officer