X0306 4 2017-11-16 0 0001671933 Trade Desk, Inc. TTD 0001671413 Stempeck Brian John C/O THE TRADE DESK, INC. 42 NORTH CHESTNUT STREET VENTURA CA 93001 0 1 0 0 Chief Client Officer Class A Common Stock 2017-11-16 4 S 0 7754 48.596 D 38923 D Class A Common Stock 2017-11-16 4 S 0 2246 49.424 D 36677 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 $48.113 to $49.08, 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. Includes 2,777 shares acquired through the Employee Stock Purchase Plan on November 15, 2017. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $49.12 to $49.96, 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. /s/ Vivian Yang, Attorney-in-Fact for Brian J. Stempeck 2017-11-17