X0609 4 2026-09-11 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 1 Class A Common Stock 2026-09-11 4 S 0 15000 16.2927 D 1016776 D The sale reported in this transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 12, 2026, as described in the Issuer's Quarterly Report on Form 10-Q for the three months ended June 30, 2026, filed with the Securities and Exchange Commission on July 30, 2026. The price reported is a weighted average sale price. The shares were sold in multiple transactions at prices ranging from $16.175 to $16.52, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ Jamie Chung, Attorney-in-Fact 2026-09-15