X0508 4 2026-03-04 0 0001874178 Rivian Automotive, Inc. / DE RIVN 0001262742 CALLAHAN MICHAEL JOHN C/O RIVIAN AUTOMOTIVE, INC. 14600 MYFORD ROAD IRVINE CA 92606 0 1 0 0 Chief Administrative Officer 0 Class A Common Stock 2026-03-04 4 A 0 24475 0 A 862510 D Class A Common Stock 2026-03-04 4 F 0 12453 15.10 D 850057 D Represents an award of 24,475 restricted stock units ("RSUs") which vested on March 4, 2026. 12,453 shares of Class A Common Stock were withheld by the Company for the purposes of satisfying tax withholding obligations in connection with such RSUs vesting. The closing price of the Company's Class A Common Stock on March 3, 2026. /s/ Jamie Chung, Attorney-in-Fact 2026-03-05