X0306 4 2019-03-13 0 0000917273 RAMBUS INC RMBS 0001341984 Seraphin Luc C/O RAMBUS INC. 1050 ENTERPRISE WAY, SUITE 700 SUNNYVALE CA 94089 1 1 0 0 President and CEO Common Stock 2019-03-13 4 S 0 37825 10.26 D 258479 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted on February 11, 2019. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.13 to $10.34, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price. /s/ Kirk Williams, by power of attorney 2019-03-14