X0306 4 2021-07-15 0 0001671933 Trade Desk, Inc. TTD 0001796825 GRAYSON BLAKE JEFFREY C/O THE TRADE DESK, INC. 42 NORTH CHESTNUT STREET VENTURA CA 93001 0 1 0 0 Chief Financial Officer Class A Common Stock 2021-07-15 4 S 0 690 73.35 D 211830 D Class A Common Stock 2021-07-19 4 M 0 10000 27.235 A 221830 D Class A Common Stock 2021-07-19 4 S 0 7621 68.18 D 214209 D Class A Common Stock 2021-07-19 4 S 0 2379 69.07 D 211830 D Employee Stock Option (Right to Buy) 27.235 2021-07-19 4 M 0 10000 0.00 D 2029-12-27 Class A Common Stock 10000 69130 D The Sales reported in this Form 4 were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person in accordance with Rule 10b5-1 of the Securities and Exchange Act of 1934, as amended. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.71 to $68.67., 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 ranges set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.71 to $69.43, 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 ranges set forth in this footnote. The option was granted on December 27, 2019. The VCD was December 16, 2019. One forty-eighth (1/48th) of the shares subject to the option vest each monthly anniversary of the VCD, subject to continued employment with the Issuer through the applicable vesting dates. /s/ Alfred Palomino, Attorney-in-Fact for Blake Jeffrey Grayson 2021-07-19