X0306 4 2019-05-01 0 0000917273 RAMBUS INC RMBS 0001188095 KISSNER CHARLES 1050 ENTERPRISE WAY, SUITE 700 SUNNYVALE CA 94089 1 0 0 0 Common Stock 2019-05-01 4 A 0 14156 0.00 A 47503 D Common Stock 41723 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. The shares are held directly by Kissner and Associates LLC for which the Reporting Person serves as the owner of the company. /s/ Kirk Williams, by power of attorney 2019-05-02