X0407 4 2023-04-03 0 0000917273 RAMBUS INC RMBS 0001318086 Higashi Emiko C/O RAMBUS INC. 4453 NORTH FIRST STREET, SUITE 100 SAN JOSE CA 95134 1 0 0 0 0 Common Stock 2023-04-03 4 A 0 3653 0.00 A 65686 D The shares are represented by restricted stock units, or RSUs, all of which vest April 3, 2024 or the first business day thereafter. Each RSU represents the contingent right to receive one share of RMBS common stock. /s/ Brian Wu, by power of attorney 2023-04-04