Sec Form 4 Filing - WELLS DAVID B @ Trade Desk, Inc. - 2025-05-13

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person WELLS DAVID B 2. Issuer Name and Ticker or Trading Symbol Trade Desk, Inc. [ TTD] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O THE TRADE DESK, INC., 42 NORTH CHESTNUT STREET 3. Date of Earliest Transaction (MM/DD/YY) 05/13/2025 (Street) VENTURA, CA93001 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 05/13/2025 M 6,990 A $ 58.458 73,975 D Class A Common Stock 05/13/2025 M 1,390 A $ 58.458 75,365 D Class A Common Stock 05/13/2025 M 670 A $ 58.458 76,035 D Class A Common Stock 05/13/2025 M 220 A $ 58.458 76,255 D Class A Common Stock 05/13/2025 M 6,826 A $ 49.03 83,081 D Class A Common Stock 05/13/2025 M 1,365 A $ 49.03 84,446 D Class A Common Stock 05/13/2025 M 655 A $ 49.03 85,101 D Class A Common Stock 05/13/2025 M 218 A $ 49.03 85,319 D Class A Common Stock 05/13/2025 M 7,282 A $ 66.26 92,601 D Class A Common Stock 05/13/2025 M 1,374 A $ 66.26 93,975 D Class A Common Stock 05/13/2025 M 1,374 A $ 66.26 95,349 D Class A Common Stock 05/13/2025 M 274 A $ 66.26 95,623 D Class A Common Stock 05/13/2025 S 28,638 ( 1 ) D $ 79.88 ( 2 ) 66,985 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 58.458 ( 3 ) 05/13/2025 M 6,990 ( 4 ) 05/27/2031 Class A Common Stock 6,990 $ 0 0 D Stock Option (Right to Buy) $ 58.458 ( 5 ) 05/13/2025 M 1,390 ( 4 ) 05/27/2031 Class A Common Stock 1,390 $ 0 0 D Stock Option (Right to Buy) $ 58.458 ( 6 ) 05/13/2025 M 670 ( 7 ) 05/27/2031 Class A Common Stock 670 $ 0 0 D Stock Option (Right to Buy) $ 58.458 ( 8 ) 05/13/2025 M 220 ( 9 ) 05/27/2031 Class A Common Stock 220 $ 0 0 D Stock Option (Right to Buy) $ 49.03 05/13/2025 M 6,826 ( 10 ) 05/26/2032 Class A Common Stock 6,826 $ 0 0 D Stock Option (Right to Buy) $ 49.03 05/13/2025 M 1,365 ( 10 ) 05/26/2032 Class A Common Stock 1,365 $ 0 0 D Stock Option (Right to Buy) $ 49.03 05/13/2025 M 655 ( 11 ) 05/26/2032 Class A Common Stock 655 $ 0 0 D Stock Option (Right to Buy) $ 49.03 05/13/2025 M 218 ( 12 ) 05/26/2032 Class A Common Stock 218 $ 0 0 D Stock Option (Right to Buy) $ 66.26 05/13/2025 M 7,282 ( 13 ) 05/25/2033 Class A Common Stock 7,282 $ 0 0 D Stock Option (Right to Buy) $ 66.26 05/13/2025 M 1,374 ( 13 ) 05/25/2033 Class A Common Stock 1,374 $ 0 0 D Stock Option (Right to Buy) $ 66.26 05/13/2025 M 1,374 ( 14 ) 05/25/2033 Class A Common Stock 1,374 $ 0 0 D Stock Option (Right to Buy) $ 66.26 05/13/2025 M 274 ( 15 ) 05/25/2033 Class A Common Stock 274 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other WELLS DAVID B C/O THE TRADE DESK, INC. 42 NORTH CHESTNUT STREET VENTURA, CA93001 X Signatures /s/ Kelli Faerber, Attorney-In-Fact for David B. Wells 05/15/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These sales represent the aggregate shares from the twelve acquisitions reported above. ( 2 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.88 to $79.92, 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. ( 3 )This option was previously reported as covering 699 shares at an exercise price of $584.58 per share, but was adjusted to reflect a 10-for-1 stock split effective June 16, 2021. ( 4 )The option was granted on May 27, 2021. The shares subject to the option vested 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 vested 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. ( 5 )This option was previously reported as covering 139 shares at an exercise price of $584.58 per share, but was adjusted to reflect a 10-for-1 stock split effective June 16, 2021. ( 6 )This option was previously reported as covering 67 shares at an exercise price of $584.58 per share, but was adjusted to reflect a 10-for-1 stock split effective June 16, 2021. ( 7 )The option was granted on May 27, 2021. The shares subject to the option vested 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 vested 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. ( 8 )This option was previously reported as covering 22 shares at an exercise price of $584.58 per share, but was adjusted to reflect a 10-for-1 stock split effective June 16, 2021. ( 9 )The option was granted on May 27, 2021. The shares subject to the option vested 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 vested 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. ( 10 )The option was granted on May 26, 2022. The shares subject to the option vested 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 vested 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. ( 11 )The option was granted on May 26, 2022. The shares subject to the option vested 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 vested 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. ( 12 )The option was granted on May 26, 2022. The shares subject to the option vested 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 vested 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. ( 13 )The option was granted on May 25, 2023. The shares subject to the option vested 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 vested 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. ( 14 )The option was granted on May 25, 2023. The shares subject to the option vested 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 vested 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. ( 15 )The option was granted on May 25, 2023. The shares subject to the option vested 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 vested 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.

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