X0306 4 2021-02-01 0 0000917273 RAMBUS INC RMBS 0001686794 MATHUR RAHUL C/O RAMBUS INC. 4453 NORTH FIRST STREET, SUITE 100 SUNNYVALE CA 94089 0 1 0 0 SVP, CFO Common Stock 2021-02-01 4 F 0 14154 19.52 D 201945 D Common Stock 2021-02-01 4 A 0 13767 0.00 A 215712 D Common Stock 2021-02-01 4 A 0 30737 0.00 A 246449 D The shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of restricted stock units, or RSUs. Includes an exempt transaction of 1,794 shares acquired through the Rambus Inc. 2015 Employee Stock Purchase plan. The shares are represented by performance restricted stock units, or PRSUs, all of which vest on February 1, 2021 based upon assessed achievement of the Company's performance metrics and continued service to the Company through the vesting date. Each PRSU represents a contingent right to receive one share of RMBS common stock. The shares are represented by RSUs which vest in four equal annual installments beginning on February 1, 2022 or the first business trading day thereafter. Each RSU represents a contingent right to receive one share of RMBS common stock. s/ Keith Jones, by power of attorney 2021-02-03