X0609 4 2026-05-20 0 0001874178 Rivian Automotive, Inc. / DE RIVN 0001262742 CALLAHAN MICHAEL JOHN false C/O RIVIAN AUTOMOTIVE, INC. 14600 MYFORD ROAD IRVINE CA 92606 0 1 0 0 Chief Administrative Officer 0 Class A Common Stock 2026-05-20 5 A 0 E 1682 11.6705 A 1073858 D The Reporting Person is voluntarily reporting the acquisition of shares of the Issuer's Class A Common Stock pursuant to the Rivian Automotive, Inc. 2021 Employee Stock Purchase Plan (the "ESPP") for the purchase period of November 21, 2025 through May 20, 2026 (the "Offering Period"). The acquisition of those 1,682 shares of Class A Common Stock was also exempt pursuant to Rule 16b-3(c). The Offering Period ended on May 20, 2026, and the shares were acquired on the last business day of the Offering Period. In accordance with the ESPP, these shares were purchased at a price that represented 85% of the closing price of the Issuer's Class A Common Stock on May 20, 2026. /s/ Jamie Chung, Attorney-in-Fact 2026-05-22