DSP

SEC source: 0001828791-25-000101 · wk-form4_1766111999.xml · nonDerivative · entry 6

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 262,182

F8 · kind: Reflects a gift to a Donor Advised Fund.

SEC source: 0001828791-25-000101 · wk-form4_1766111999.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: 2,500

F5 · 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 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 $11.62 to $12.175. 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: 0001843104-25-000010 · wk-form4_1766109715.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: 2,500

F5 · 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 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 $11.62 to $12.175. 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: 0001844767-25-000008 · wk-form4_1766109686.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 $11.62 to $12.175. 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: 0001284309-25-000012 · wk-form4_1766109567.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 409,778

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

SEC source: 0001828791-25-000101 · wk-form4_1766111999.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: 7,500

F5 · 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 $11.485 to $12.235. 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: 0001828791-25-000101 · wk-form4_1766111999.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 347,182

F4 · 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: 0001843104-25-000010 · wk-form4_1766109715.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: 7,500

F5 · 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 $11.485 to $12.235. 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: 0001843104-25-000010 · wk-form4_1766109715.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 347,182

F4 · 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: 0001844767-25-000008 · wk-form4_1766109686.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 $11.485 to $12.235. 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: 0001828791-25-000101 · wk-form4_1766111999.xml · derivative · entry 7

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

10b5-1 filing: Plan reported

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,157,275

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: 0001828791-25-000101 · wk-form4_1766111999.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: 9,157,275

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 the Reporting Person 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 the Reporting Person 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: 0001828791-25-000101 · wk-form4_1766111999.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: 0001843104-25-000010 · wk-form4_1766109715.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: 9,157,275

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 · 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.

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: 0001843104-25-000010 · wk-form4_1766109715.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: 9,157,275

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 the Reporting Person 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 the Reporting Person 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: 0001843104-25-000010 · wk-form4_1766109715.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: 0001844767-25-000008 · wk-form4_1766109686.xml · derivative · entry 5

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,471,826

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 · 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 · 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: 0001844767-25-000008 · wk-form4_1766109686.xml · nonDerivative · entry 2

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,471,826

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: 0001844767-25-000008 · wk-form4_1766109686.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: 0001844767-25-000005 · wk-form4_1758148771.xml · nonDerivative · entry 3

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · kind: Pursuant to the Unit Exchange and Purchase Agreement dated September 15, 2025, the Issuer has purchased an aggregate of 941,777 shares of Class A common stock from Capital V LLC for an aggregate price of approximately $9,000,000. Capital V LLC sold such shares to the Issuer in connection with tax planning.

SEC source: 0001843104-25-000007 · wk-form4_1758148734.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 0

F6 · kind: Pursuant to the Unit Exchange and Purchase Agreement dated September 15, 2025, the Issuer has purchased an aggregate of 941,777 shares of Class A common stock from Capital V LLC for an aggregate price of approximately $9,000,000. The Reporting Person sold such shares to the Issuer in connection with tax planning.

F4 · 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: 0001843103-25-000007 · wk-form4_1758148703.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 0

F6 · kind: Pursuant to the Unit Exchange and Purchase Agreement dated September 15, 2025, the Issuer has purchased an aggregate of 941,777 shares of Class A common stock from Capital V LLC for an aggregate price of approximately $9,000,000. The Reporting Person sold such shares to the Issuer in connection with tax planning.

F4 · 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: 0001844767-25-000005 · wk-form4_1758148771.xml · derivative · entry 4

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,509,326

Underlying: Class A Common Stock · 941,777 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 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 · kind: The Class B Units of Viant Technology LLC 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 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 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: 0001844767-25-000005 · wk-form4_1758148771.xml · nonDerivative · entry 2

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,509,326

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: 0001844767-25-000005 · wk-form4_1758148771.xml · nonDerivative · entry 1

Capital V LLC · CIK 0001844767 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 941,777

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 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 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: 0001843104-25-000007 · wk-form4_1758148734.xml · derivative · entry 10

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,169,775

Underlying: Class A Common Stock · 313,926 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.

F3 · 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.

F3 · 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.

F3 · 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.

F3 · 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.

F4 · 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: 0001843104-25-000007 · wk-form4_1758148734.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,169,775

F5 · 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.

F5 · 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.

F4 · 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: 0001843104-25-000007 · wk-form4_1758148734.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 313,926

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.

F3 · 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.

F3 · 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.

F4 · 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: 0001843103-25-000007 · wk-form4_1758148703.xml · derivative · entry 10

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,169,775

Underlying: Class A Common Stock · 313,926 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.

F3 · 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.

F3 · 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.

F3 · 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.

F3 · 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.

F4 · 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: 0001843103-25-000007 · wk-form4_1758148703.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 9,169,775

F5 · 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.

F5 · 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.

F4 · 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: 0001843103-25-000007 · wk-form4_1758148703.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Capital V LLC

Disclosed balance after: 313,926

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.

F3 · 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.

F3 · 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.

F4 · 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: 0001284309-25-000010 · wk-form4_1758148661.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 423,255

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

SEC source: 0001843104-25-000007 · wk-form4_1758148734.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: 356,284

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.

F2 · balance_after: On December 20, 2024, the Reporting Person filed a Form 4, which inadvertently reported a gift of 31,556 shares of the Issuer's Class A common stock when the actual number of shares gifted was 31,566. The total number of shares of Class A common stock held by the Reporting Person has been corrected herein accordingly.

SEC source: 0001843103-25-000007 · wk-form4_1758148703.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: 356,284

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.

F2 · balance_after: On December 20, 2024, the Reporting Person filed a Form 4, which inadvertently reported a gift of 31,556 shares of the Issuer's Class A common stock when the actual number of shares gifted was 31,566. The total number of shares of Class A common stock held by the Reporting Person has been corrected herein accordingly.

SEC source: 0001628280-25-031439 · wk-form4_1749863388.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 436,261

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

SEC source: 0001628280-25-031440 · wk-form4_1749863481.xml · nonDerivative · entry 1

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 365,076

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: 0001628280-25-031441 · wk-form4_1749863554.xml · nonDerivative · entry 1

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 365,076

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: 0001628280-25-030284 · wk-form4_1749504939.xml · nonDerivative · entry 3

VALDES MAX O · CIK 0001219307 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,591

SEC source: 0001628280-25-030284 · wk-form4_1749504939.xml · nonDerivative · entry 2

VALDES MAX O · CIK 0001219307 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,429

F2 · shares: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.865 to $13.90. 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: 0001628280-25-030284 · wk-form4_1749504939.xml · nonDerivative · entry 1

VALDES MAX O · CIK 0001219307 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,491

F1 · shares: Grant of restricted stock units that vest in full on the earlier of (i) the date of the Issuer's 2026 Annual Meeting of Stockholders (or the date immediately prior to the 2026 Annual Meeting if the Reporting Person's service as a director ends at the 2026 Annual Meeting due to the Reporting Person's failure to be re-elected or the Reporting Person not standing for re-election); or (ii) the one-year anniversary measured from the date of grant, subject to the Reporting Person's continuous service through such vesting date. Each restricted stock unit represents the right to receive one share of the Issuer's Class A common stock.

SEC source: 0001628280-25-030283 · wk-form4_1749504880.xml · nonDerivative · entry 1

Wilson Brett · CIK 0001612849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,919

F1 · shares: Grant of restricted stock units that vest in full on the earlier of (i) the date of the Issuer's 2026 Annual Meeting of Stockholders (or the date immediately prior to the 2026 Annual Meeting if the Reporting Person's service as a director ends at the 2026 Annual Meeting due to the Reporting Person's failure to be re-elected or the Reporting Person not standing for re-election); or (ii) the one-year anniversary measured from the date of grant, subject to the Reporting Person's continuous service through such vesting date. Each restricted stock unit represents the right to receive one share of the Issuer's Class A common stock.

SEC source: 0001628280-25-030289 · wk-form4_1749505136.xml · nonDerivative · entry 1

Yang Vivian · CIK 0001615037 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,913

F1 · shares: Grant of restricted stock units that vest in full on the earlier of (i) the date of the Issuer's 2026 Annual Meeting of Stockholders (or the date immediately prior to the 2026 Annual Meeting if the Reporting Person's service as a director ends at the 2026 Annual Meeting due to the Reporting Person's failure to be re-elected or the Reporting Person not standing for re-election); or (ii) the one-year anniversary measured from the date of grant, subject to the Reporting Person's continuous service through such vesting date. Each restricted stock unit represents the right to receive one share of the Issuer's Class A common stock.

SEC source: 0001219307-25-000001 · wk-form4_1747859298.xml · nonDerivative · entry 1

VALDES MAX O · CIK 0001219307 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,109

F1 · shares: Represents shares gifted by the Reporting Person for estate and tax planning purposes to a family member who does not share the same residence as the Reporting Person.

SEC source: 0001628280-25-025546 · wk-form4_1747256302.xml · nonDerivative · entry 2

Wilson Brett · CIK 0001612849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,537

F2 · shares: Grant of RSUs which shall vest in full on the date of the Issuer's 2025 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: 0001628280-25-025546 · wk-form4_1747256302.xml · nonDerivative · entry 1

Wilson Brett · CIK 0001612849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,788

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: 0001284309-25-000005 · wk-form4_1742347609.xml · nonDerivative · entry 2

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 449,526

F2 · shares: Grant of RSUs which shall vest in equal quarterly installments (8.33% per quarter) 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 and the applicable grant notice and agreement. Each RSU represents the right to receive one share of the Issuer's Class A common stock.

SEC source: 0001284309-25-000005 · wk-form4_1742347609.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 398,551

F1 · shares: Grant of restricted stock units ("RSUs") which shall vest in equal quarterly installments (8.33% per quarter) 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 and the applicable grant notice and agreement. Each RSU represents the right to receive one share of the Issuer's Class A common stock.

SEC source: 0001284309-25-000004 · wk-form4_1741726846.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 286,128

F1 · shares: Shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of 108,098 restricted stock units on March 10, 2025. These shares were neither issued to nor sold by the Reporting Person.

SEC source: 0001843103-25-000001 · wk-form4_1741726790.xml · nonDerivative · entry 1

Vanderhook Timothy · CIK 0001843103 · Director · CEO and Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 374,036

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 172,955 restricted stock units on March 10th, 2025.

SEC source: 0001843104-25-000001 · wk-form4_1741726700.xml · nonDerivative · entry 1

Vanderhook Christopher · CIK 0001843104 · Director · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 374,036

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 172,955 restricted stock units on March 10th, 2025.