X0306 4 2021-06-02 0 0001389002 MARIN SOFTWARE INC MRIN 0001570728 Hutchison Donald P. C/O MARIN SOFTWARE INCORPORATED 123 MISSION ST, 27TH FLOOR SAN FRANCISCO CA 94105 1 0 0 0 Common Stock 2021-06-02 4 M 0 27972 A 27972 D Common Stock 37011 I By Hutchison Family Trust Common Stock 7028 I By Glasgow Investments, LLC Restricted Stock Unit 2021-06-02 4 M 0 27972 0.00 D Common Stock 27972 55944 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock. The Reporting Person is a managing member of Glasgow Investments, LLC and possesses the power to direct the voting and disposition of the shares held by Glasgow Investments, LLC and as such may be deemed to beneficially own the shares of the Issuer's Common Stock held by Glasgow Investments, LLC. The RSUs shall vest as to one-third of the total number of shares on the date of the Issuer's annual meeting of stockholders held in each of 2021, 2022 and 2023, 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. /s/ Donald P. Hutchison by Robert Bertz, Attorney-in-Fact 2021-06-04