X0407 4 2023-05-25 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 1 Class A Common Stock 2023-05-30 4 S 0 20000 70.00 D 86570 D Stock Option (Right to buy) 66.26 2023-05-25 4 A 0 7282 0.00 A 2033-05-25 Class A Common Stock 7282 7282 D Stock Option (Right to Buy) 66.26 2023-05-25 4 A 0 1374 36.39 A 2033-05-25 Class A Common Stock 1374 1374 D Stock Option (Right to Buy) 66.26 2023-05-25 4 A 0 1374 36.39 A 2033-05-25 Class A Common Stock 1374 1374 D Stock Option (Right to Buy) 66.26 2023-05-25 4 A 0 274 36.39 A 2033-05-25 Class A Common Stock 274 274 D The sales reported in this Form 4 were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on February 22, 2023 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 $70.00 to $70.01, 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. Grant of option to purchase Class A Common Stock under the Issuer's 2016 Equity Incentive Plan. The shares subject to the option vest in four equal installments at the earlier of, for each such installment, (i) the date of the Issuer's applicable regularly scheduled quarterly Corporate Board meeting for the next four quarters from the date of grant or (ii) the date of each of the next four corresponding quarterly anniversaries of the date of grant, provided all then unvested shares shall vest in full on the date of the Issuer's next annual meeting of stockholders, all subject to the Reporting Person's continuous service as a member of the board of directors immediately prior to such date. The option was issued to the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Policy as an annual director equity grant. This price represents the Black-Scholes value of an option using the average closing stock price for a share of the Issuer's Class A Common Stock for forty-five consecutive trading days ending on, and including, the grant date. This price was used to calculate the number of shares subject to the option granted. The option was issued to the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Policy in lieu of director retainer and meeting fees of $50,000. Grant of option to purchase Class A Common Stock under the Issuer's 2016 Equity Incentive Plan. The shares subject to the option vest in four equal installments at the earlier of, for each such installment, (i) the date of the Issuer's applicable regularly scheduled quarterly Corporate Board meeting for the next four quarters from the date of grant or (ii) the date of each of the next four corresponding quarterly anniversaries of the date of grant, provided all then unvested shares shall vest in full on the date of the Issuer's next annual meeting of stockholders, all subject to the Reporting Person's continuous service as a member of the audit committee immediately prior to such date. Grant of option to purchase Class A Common Stock under the Issuer's 2016 Equity Incentive Plan. The shares subject to the option vest in four equal installments at the earlier of, for each such installment, (i) the date of the Issuer's applicable regularly scheduled quarterly Corporate Board meeting for the next four quarters from the date of grant or (ii) the date of each of the next four corresponding quarterly anniversaries of the date of grant, provided all then unvested shares shall vest in full on the date of the Issuer's next annual meeting of stockholders, all subject to the Reporting Person's continuous service as a member of the compensation committee immediately prior to such date. The option was issued to the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Policy in lieu of director retainer and meeting fees of $10,000. /s/ Kelli Faerber - Attorney-In-Fact for David B. Wells 2023-05-30