X0306 4 2020-01-13 0 0001671933 Trade Desk, Inc. TTD 0001507645 WELLS DAVID B C/O THE TRADE DESK, INC. 42 NORTH CHESTNUT STREET VENTURA CA 93001 1 0 0 0 Class A Common Stock 2020-01-13 4 C 0 10000 0.00 A 19408 D Class A Common Stock 2020-01-13 4 S 0 1700 279.61 D 17708 D Class A Common Stock 2020-01-13 4 S 0 1635 280.49 D 16073 D Class A Common Stock 2020-01-13 4 S 0 2129 281.63 D 13944 D Class A Common Stock 2020-01-13 4 S 0 2636 282.56 D 11308 D Class A Common Stock 2020-01-13 4 S 0 1900 283.48 D 9408 D Employee Stock Option (Right to Buy) 3.36 2020-01-13 4 M 0 10000 0.00 D 2025-12-19 Class B Common Stock 10000 5000 D Class B Common Stock 0.00 2020-01-13 4 M 0 10000 0.00 A Class A Common Stock 10000 10000 D Class B Common Stock 0.00 2020-01-13 4 C 0 10000 0.00 D Class A Common Stock 10000 0 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 $279.12 to $280.00, 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 $280.13 to $281.01, 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 $281.26 to $282.10, 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 $282.17 to $282.85, 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 $283.24 to $283.96, 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. The option was granted on December 20, 2015, (the "Grant Date"). One-fourth (1/4th) of the shares subject to the option vest on the first anniversary of the Grant Date, with one forty-eighth (1/48th ) of the shares subject to the original grant vesting on each monthly anniversary thereafter, subject to continued service as a director of the Issuer through the applicable vesting dates. Each share of Class B Common Stock has no expiration date and is convertible for no additional consideration into one (1) share of Class A Common Stock at the option of the holder thereof at any time and upon certain other circumstances. /s/ Vivian Yang - Attorney-In-Fact for David B. Wells 2020-01-15