X0306 4 2019-05-01 0 0000917273 RAMBUS INC RMBS 0001234045 STANG ERIC B 1050 ENTERPRISE WAY, SUITE 700 SUNNYVALE CA 94089 1 0 0 0 Common Stock 2019-05-01 4 A 0 14156 0.00 A 28266 D Common Stock 74227 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 held directly by the Stang Family Trust dated September 2, 2004 for which the Reporting Person serves as a trustee. /s/ Kirk Williams, by power of attorney 2019-05-02