X0306 4 2021-09-01 0 0001671933 Trade Desk, Inc. TTD 0001670811 Paley Eric B C/O THE TRADE DESK, INC. 42 NORTH CHESTNUT STREET VENTURA CA 93001 1 0 0 0 Class A Common Stock 2021-09-01 4 S 0 3844 79.59 D 134366 D Class A Common Stock 2021-09-01 4 S 0 3656 80.31 D 130710 D Class A Common Stock 2021-09-01 4 S 0 3866 79.61 D 72914 I See Footnote Class A Common Stock 2001-09-01 4 S 0 3634 80.30 D 69280 I See Footnote Class A Common Stock 43920 I See Footnote 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 $78.99 to $79.97, 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. On June 16, 2021, the Issuer effected a 10-for-1 stock split of its common stock resulting in the reporting person's ownership of 124,389 additional shares of common stock. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $80.00 to $80.55, 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 $78.97 to $79.96, 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. On June 16, 2021, the Issuer effected a 10-for-1 stock split of its common stock resulting in the reporting person's ownership of 69,102 additional shares of common stock. The reported securities are owned directly by the Eric Paley 2015 Remainder Trust (the "2015 Remainder Trust"). The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.97 to $80.57, 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. On June 16, 2021, the Issuer effected a 10-for-1 stock split of its common stock resulting in the reporting person's ownership of 39,528 additional shares of common stock. The reported securities are owned directly by the Eric Paley 2015 Remainder Trust - GST Exempt Share (the "2015 Remainder Trust-Exempt"). /s/ Jay Grant - Attorney-In-Fact for Eric B. Paley 2021-09-03