X0306 4 2021-08-04 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 2021-08-04 4 S 0 8000 6.05 D 94903 D Common Stock 2021-08-05 4 S 0 6000 6.00 D 88903 D The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.04 to $6.06 per share, 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 within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.92 to $6.05 per share, 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 within the range set forth in this footnote. /s/ Wister Walcott by Robert Bertz, Attorney-in-Fact 2021-08-06