X0306 4 2021-05-13 0 0001389002 MARIN SOFTWARE INC MRIN 0001570725 Walcott Wister C/O MARIN SOFTWARE INCORPORATED 123 MISSION ST, 27TH FLOOR SAN FRANCISCO CA 94105 0 1 0 0 EVP, Product and Technology Common Stock 2021-05-13 4 M 0 11250 A 107525 D Common Stock 2021-05-13 4 F 0 4622 1.37 D 102903 D Restricted Stock Units 2021-05-13 4 M 0 11250 0.00 D 2026-05-12 Common Stock 11250 11250 D Each restricted stock unit ("RSU") represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement. Exempt transaction pursuant to Section 16b-3(e) - payment of exercise price or tax liability by delivering or withholding securities incident to the receipt, exercise or vesting of a security issued in accordance with Rule 16b-3. All of the shares reported as disposed of in this Form 4 were relinquished by the Reporting Person and cancelled by the Issuer in exchange for the Issuer's agreement to pay federal and state tax withholding obligations of the Reporting Person resulting from the vesting of RSUs. The Reporting Person did not sell or otherwise dispose of any of the shares reported on this Form 4 for any reason other than to cover required taxes. 25% of the RSUs vest annually on the each of May 13, 2020, May 13, 2021, May 13, 2022 and May 7, 2023, subject to the continuing employment of the Reporting Person on each vesting date. Shares of the Issuer's common stock will be delivered to the Reporting Person upon vesting. /s/ Wister Walcott by Robert Bertz, Attorney-in-Fact 2021-05-17