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SCHEDULE 13D/A 0001284309 XXXXXXXX LIVE 4 Class A common stock, par value $0.001 per share 12/15/2025 false 0001828791 92557A101 Viant Technology Inc. 2722 Michelson Drive Suite 100 Irvine CA 92612 Larry Madden 9498618888 2722 Michelson Drive Suite 100 Irvine CA 92612 0001284309 N Larry Madden OO N X1 1114384.00 0.00 1114384.00 0.00 1114384.00 N 6.3 IN Class A common stock, par value $0.001 per share Viant Technology Inc. 2722 Michelson Drive Suite 100 Irvine CA 92612 This Amendment No. 4 to Schedule 13D (this "Amendment No. 4") amends and supplements the statement on Schedule 13D filed with the United States Securities and Exchange Commission on June 12, 2024 (as amended to date, the "Schedule 13D"), relating to the Class A common stock, par value $0.001 per share (the "Class A Common Stock"), of Viant Technology Inc., a Delaware corporation (the "Issuer"). Capitalized terms used herein without definition shall have the meaning set forth in the Schedule 13D. 10b5-1 Trading Plan - December 2025 On December 15, 2025, the Reporting Person entered into a new trading plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the "December 2025 10b5-1 Trading Plan"). Pursuant to the December 2025 10b5-1 Trading Plan, the Broker agreed to make periodic sales of up to an aggregate of 200,000 shares of Class A Common Stock on behalf of the Reporting Person through August 31, 2026, less any and all additional shares sold pursuant to the previously disclosed June 2025 10b5-1 Trading Plan. The amount and timing of sales, if any, pursuant to the December 2025 10b5-1 Trading Plan will be determined based on the terms of the December 2025 10b5-1 Trading Plan, market conditions, share price and other factors. This description of the December 2025 10b5-1 Trading Plan does not purport to be complete and is qualified in its entirety by the text of the December 2025 10b5-1 Trading Plan, which is attached as an exhibit to this Schedule 13D and incorporated herein by reference. The Reporting Person may be deemed to beneficially own 1,114,384 shares of Class A Common Stock, which consists of (i) 194,940 shares of Class A Common Stock held of record by the Reporting Person, (ii) 445,088 shares of Class A Common Stock underlying stock options that are exercisable or will become exercisable within 60 days of the date hereof and (iii) 474,356 shares of Class A Common Stock underlying Class B Units that are currently convertible on a one-to-one basis. Based upon 16,678,890 shares of Class A Common Stock outstanding as of November 7, 2025, as disclosed in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 10, 2025, the Reporting Person may be deemed to beneficially own 6.33% of the Class A Common Stock. The ownership information assumes (i) the redemption of the Class B Units indirectly held by the Reporting Person for shares of the Issuer's Class A Common Stock on a one-to-one basis, (ii) the exercise of stock options held of record by the Reporting Person that are currently exercisable or will become exercisable within 60 days of the date hereof and (iii) the vesting of RSUs held by the Reporting Person, if any, within 60 days of the date hereof. Sole power to vote or direct the vote: 1,114,384 Shared power to vote: 0 Sole power to dispose or direct the disposition of: 1,114,384 Shared power to dispose or direct the disposition of: 0 On December 17, 2025, the Issuer sold, on the Reporting Person's behalf, 13,477 shares of Class A Common Stock in an open-market transaction for $11.704 per share to cover withholding tax associated with the vesting and settlement of the Reporting Person's RSUs. None. Not applicable. Item 4 above summarizes certain provisions of the December 2025 10b5-1 Trading Plan and is incorporated herein by reference. A copy of the December 2025 10b5-1 Trading Plan is attached as an exhibit to this Schedule 13D, and is incorporated by reference herein. Except as set forth herein, the Reporting Person does not have any contracts, arrangements, understandings or relationships (legal or otherwise) with any person with respect to any securities of the Issuer, including but not limited to any contracts, arrangements, understandings or relationships concerning the transfer or voting of such securities, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or losses, or the giving or withholding of proxies. Exhibit 4: 10b5-1 Trading Plan, dated December 15, 2025. Larry Madden Larry Madden Chief Financial Officer 12/22/2025