DSP

SEC source: 0001284309-26-000030 · wk-form4_1792024248.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 322,000

F1 · kind: Shares sold pursuant to a 10b5-1 plan adopted by the Reporting Person on June 17, 2026.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.93 to $13.31. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001843104-26-000016 · wk-form4_1789428818.xml · nonDerivative · entry 1

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 285,244

F1 · shares: Represents shares repurchased by the Issuer from the Reporting Person in the amount of estimated taxes to be paid by the Reporting Person in connection with the vesting of 16,198 restricted stock units on September 10, 2026.

SEC source: 0001843103-26-000016 · wk-form4_1789428614.xml · nonDerivative · entry 1

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 200,244

F1 · shares: Represents shares repurchased by the Issuer from the Reporting Person in the amount of estimated taxes to be paid by the Reporting Person in connection with the vesting of 16,198 restricted stock units on September 10, 2026.

SEC source: 0001284309-26-000025 · wk-form4_1789428449.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 374,355

F1 · shares: Shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of 44,513 restricted stock units on September 10, 2026. These shares were neither issued to nor sold by the Reporting Person.

SEC source: 0001284309-26-000023 · wk-form4_1786659945.xml · nonDerivative · entry 2

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 398,371

F1 · kind: Shares sold pursuant to a 10b5-1 plan adopted by the Reporting Person on December 15, 2025.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.66 to $13.70. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001284309-26-000023 · wk-form4_1786659945.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 399,802

F1 · kind: Shares sold pursuant to a 10b5-1 plan adopted by the Reporting Person on December 15, 2025.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.51 to $13.455. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001586746-26-000008 · wk-form4_1786576504.xml · nonDerivative · entry 2

Abrahams Craig Justin · CIK 0001586746 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,109

F2 · shares: Grant of RSUs which shall vest in full on the date of the Issuer's 2027 Annual Meeting of Stockholders, subject to the Reporting Person's continuous service through such vesting date. Each RSU represents the right to receive one share of the Issuer's Class A common stock.

SEC source: 0001586746-26-000008 · wk-form4_1786576504.xml · nonDerivative · entry 1

Abrahams Craig Justin · CIK 0001586746 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,389

F1 · shares: Grant of restricted stock units ("RSUs") which shall vest in three equal annual installments over three (3) years, subject to the Reporting Person's continuous service through such vesting date and the terms and conditions set forth in the Issuer's Long-Term Incentive Plan. Each RSU represents the right to receive one share of the Issuer's Class A common stock.

SEC source: 0001843103-26-000014 · wk-form4_1784858084.xml · nonDerivative · entry 5

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 0

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F7 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 12,912 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.17 to $10.81. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000014 · wk-form4_1784858061.xml · nonDerivative · entry 5

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 0

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F7 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 12,912 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.17 to $10.81. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001844767-26-000012 · wk-form4_1784858029.xml · nonDerivative · entry 5

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

F3 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.17 to $10.81. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001284309-26-000021 · wk-form4_1785194610.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 425,822

F1 · kind: Shares sold pursuant to a 10b5-1 plan adopted by the Reporting Person on December 15, 2025.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.58 to $10.81. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001843103-26-000014 · wk-form4_1784858084.xml · nonDerivative · entry 4

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 4,304

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F6 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 15,000 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.77 to $11.69. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000014 · wk-form4_1784858061.xml · nonDerivative · entry 4

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 4,304

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F6 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 15,000 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.77 to $11.69. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001844767-26-000012 · wk-form4_1784858029.xml · nonDerivative · entry 4

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 12,912

F3 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.77 to $11.69. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001843103-26-000014 · wk-form4_1784858084.xml · derivative · entry 6

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,069,775

Underlying: Class A Common Stock · 12,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.exercise_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.expiration_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843103-26-000014 · wk-form4_1784858084.xml · nonDerivative · entry 3

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,304

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F5 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 9,588 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $11.53 to $12.03. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843103-26-000014 · wk-form4_1784858084.xml · nonDerivative · entry 2

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,069,775

F3 · kind: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by Capital V LLC of an equal number of Class B Units for Class A common stock.

F3 · price: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by Capital V LLC of an equal number of Class B Units for Class A common stock.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843103-26-000014 · wk-form4_1784858084.xml · nonDerivative · entry 1

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 12,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000014 · wk-form4_1784858061.xml · derivative · entry 6

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,069,775

Underlying: Class A Common Stock · 12,500 shares

Expires not disclosed

F1 · derivative.exercise_price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F1 · derivative.exercise_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F1 · derivative.expiration_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000014 · wk-form4_1784858061.xml · nonDerivative · entry 3

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,304

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F5 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 9,588 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $11.53 to $12.03. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000014 · wk-form4_1784858061.xml · nonDerivative · entry 2

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,069,775

F3 · kind: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by Capital V LLC of an equal number of Class B Units for Class A common stock.

F3 · price: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by Capital V LLC of an equal number of Class B Units for Class A common stock.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000014 · wk-form4_1784858061.xml · nonDerivative · entry 1

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 12,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001844767-26-000012 · wk-form4_1784858029.xml · derivative · entry 6

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,209,326

Underlying: Class A Common Stock · 37,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.exercise_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.expiration_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

SEC source: 0001844767-26-000012 · wk-form4_1784858029.xml · nonDerivative · entry 3

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,912

F3 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.53 to $12.03. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001844767-26-000012 · wk-form4_1784858029.xml · nonDerivative · entry 2

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,209,326

F2 · kind: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by the Reporting Person of an equal number of Class B Units for Class A common stock.

F2 · price: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by the Reporting Person of an equal number of Class B Units for Class A common stock.

SEC source: 0001844767-26-000012 · wk-form4_1784858029.xml · nonDerivative · entry 1

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 37,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

SEC source: 0001284309-26-000019 · wk-form4_1783557699.xml · nonDerivative · entry 3

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 428,636

F1 · kind: Shares sold pursuant to a 10b5-1 plan adopted by the Reporting Person on December 15, 2025.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.43 to $12.845. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001284309-26-000019 · wk-form4_1783557699.xml · nonDerivative · entry 2

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 439,909

F1 · kind: Shares sold pursuant to a 10b5-1 plan adopted by the Reporting Person on December 15, 2025.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.69 to $13.00. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001284309-26-000019 · wk-form4_1783557699.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 449,058

F1 · kind: Shares sold pursuant to a 10b5-1 plan adopted by the Reporting Person on December 15, 2025.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.61 to $13.01. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001843104-26-000013 · wk-form4_1781824130.xml · nonDerivative · entry 5

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 0

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F7 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 7,500 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.665 to $11.23. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001844767-26-000011 · wk-form4_1781824104.xml · nonDerivative · entry 5

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

F3 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.665 to $11.23. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001843103-26-000013 · wk-form4_1781824113.xml · nonDerivative · entry 5

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 0

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F7 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 7,500 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.665 to $11.23. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000013 · wk-form4_1781824130.xml · nonDerivative · entry 4

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 2,500

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F6 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 15,000 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.91 to $11.50. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001844767-26-000011 · wk-form4_1781824104.xml · nonDerivative · entry 4

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,500

F3 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.91 to $11.50. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001843103-26-000013 · wk-form4_1781824113.xml · nonDerivative · entry 4

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 2,500

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F6 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 15,000 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.91 to $11.50. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000013 · wk-form4_1781824130.xml · derivative · entry 6

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,082,275

Underlying: Class A Common Stock · 12,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.exercise_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.expiration_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000013 · wk-form4_1781824130.xml · nonDerivative · entry 3

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 7,500

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F5 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 15,000 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.77 to $11.43. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000013 · wk-form4_1781824130.xml · nonDerivative · entry 2

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,082,275

F3 · kind: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by Capital V LLC of an equal number of Class B Units for Class A common stock.

F3 · price: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by Capital V LLC of an equal number of Class B Units for Class A common stock.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843104-26-000013 · wk-form4_1781824130.xml · nonDerivative · entry 1

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 12,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001844767-26-000011 · wk-form4_1781824104.xml · derivative · entry 6

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,246,826

Underlying: Class A Common Stock · 37,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.exercise_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.expiration_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

SEC source: 0001844767-26-000011 · wk-form4_1781824104.xml · nonDerivative · entry 3

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 22,500

F3 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.77 to $11.43. The Reporting Person undertakes to provide 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 range set forth in this footnote.

SEC source: 0001844767-26-000011 · wk-form4_1781824104.xml · nonDerivative · entry 2

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,246,826

F2 · kind: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by the Reporting Person of an equal number of Class B Units for Class A common stock.

F2 · price: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by the Reporting Person of an equal number of Class B Units for Class A common stock.

SEC source: 0001844767-26-000011 · wk-form4_1781824104.xml · nonDerivative · entry 1

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 37,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

SEC source: 0001843103-26-000013 · wk-form4_1781824113.xml · derivative · entry 6

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,082,275

Underlying: Class A Common Stock · 12,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.exercise_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · derivative.expiration_date: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843103-26-000013 · wk-form4_1781824113.xml · nonDerivative · entry 3

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 7,500

F4 · kind: Shares sold pursuant to a 10b5-1 plan adopted by Capital V LLC on March 18, 2025, as amended on September 17, 2025.

F5 · price: The price reported in Column 4 is a weighted average price, based on the Reporting Person's pro rata portion of a total of 15,000 shares of Class A Common Stock sold on behalf of Capital V LLC. These shares were sold in multiple transactions at prices ranging from $10.77 to $11.43. The Reporting Person undertakes to provide 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 range set forth in this footnote.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843103-26-000013 · wk-form4_1781824113.xml · nonDerivative · entry 2

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,082,275

F3 · kind: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by Capital V LLC of an equal number of Class B Units for Class A common stock.

F3 · price: Reflects the cancellation for no consideration of a number of shares of Class B common stock of the Issuer in connection with the redemption by Capital V LLC of an equal number of Class B Units for Class A common stock.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001843103-26-000013 · wk-form4_1781824113.xml · nonDerivative · entry 1

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 12,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F1 · price: The Class B Units of Viant Technology LLC ("Class B Units") are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled.

F2 · ownership.nature: The Reporting Person holds a one-third interest in Capital V LLC and may therefore be deemed to have an indirect pecuniary interest in one-third of Capital V LLC's total holdings.

SEC source: 0001828791-26-000059 · wk-form4_1781570516.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 459,155

F1 · kind: Shares were sold in a transaction instituted by the Issuer on the Reporting Person's behalf to cover estimated taxes associated with the vesting and settlement of restricted stock units.

SEC source: 0001828791-26-000058 · wk-form4_1781570511.xml · nonDerivative · entry 1

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 293,880

F1 · kind: Shares were sold in a transaction instituted by the Issuer on the Reporting Person's behalf to cover estimated taxes associated with the vesting and settlement of restricted stock units.