X0306 4 2019-05-01 0 0000917273 RAMBUS INC RMBS 0001189259 SHRIGLEY DAVID A 1050 ENTERPRISE WAY, SUITE 700 SUNNYVALE CA 94089 1 0 0 0 Common Stock 2019-05-01 4 A 0 14156 0.00 A 56311 D Common Stock 4300 I See footnote The shares are represented by restricted stock units, or RSUs, all of which vest May 1, 2020 or the first business day thereafter. Each RSU represents the contingent right to receive one share of RMBS common stock. Shares are held by the Shrigley Family Foundation for which the Reporting Person serves as principal. /s/ Kirk Williams, by power of attorney 2019-05-02