X0306 4 2021-05-24 0 0001389002 MARIN SOFTWARE INC MRIN 0001620476 Middleton Daina C/O MARIN SOFTWARE INCORPORATED 123 MISSION ST, 27TH FLOOR SAN FRANCISCO CA 94105 1 0 0 0 Restricted Stock Units 0.00 2021-05-24 4 A 0 41875 0.00 A Common Stock 41875 41875 D Each restricted stock unit ("RSU") represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement. The RSUs shall vest as to 100% of the total number of shares on the date of the Issuer's annual meeting of stockholders held in 2022, provided that the Reporting Person continues to serve on the Issuer's Board of Directors on each vesting date and provided further that, in the event of certain corporate transactions, all of the shares subject to the RSUs shall immediately vest in full as of the effectiveness of such transaction. The RSUs have no expiration date. /s/ Daina Middleton by Robert Bertz, Attorney-in-Fact 2021-05-26