X0306 4 2020-04-01 0 0000917273 RAMBUS INC RMBS 0001318086 Higashi Emiko 1050 ENTERPRISE WAY, SUITE 700 SUNNYVALE CA 94089 1 0 0 0 Common Stock 2020-04-01 4 A 0 13927 0.00 A 48087 D The shares are represented by restricted stock units, or RSUs, all of which vest April 1, 2021 or the first business day thereafter. Each RSU represents the contingent right to receive one share of RMBS common stock. Reflects 5,898 Restricted Stock Units canceled per the Restricted Stock Unit Termination agreement dated October 24, 2019. /s/ Keith Jones, by power of attorney 2020-04-02