X0306 4 2019-02-04 0 0001671933 Trade Desk, Inc. TTD 0001671413 Stempeck Brian John C/O THE TRADE DESK, INC. 42 NORTH CHESTNUT STREET VENTURA CA 93001 1 1 0 0 Chief Strategy Officer Class A Common Stock 2018-02-04 4 M 0 7793 30.15 A 57262 D Class A Common Stock 2018-02-04 4 S 0 19303 155.0125 D 37959 D Class A Common Stock 2019-02-05 4 M 0 13855 30.15 A 51814 D Class A Common Stock 2019-02-05 4 S 0 13855 155.0125 D 37959 D Employee Stock Option (Right to Buy) 30.15 2019-02-04 4 M 0 7793 0.00 A 2026-12-22 Class A Common Stock 7793 35507 D Employee Stock Option (Right to Buy) 30.15 2019-02-05 4 M 0 13855 0.00 A 2026-12-22 Class A Common Stock 13855 21652 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 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 $155.00 to $155.11, 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 $155.00 to $155.27, 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 23, 2016. The vesting commencement date ("VCD") is December 1, 2016. One forty-eighth (1/48th) of the shares subject to the option vest on each monthly anniversary of the VCD, subject to continued employment with the Issuer through the applicable vesting dates. /s/ Vivian Yang, Attorney-in-Fact for Brian J. Stempeck 2019-02-06