DSP

SEC source: 0001828791-26-000057 · wk-form4_1781570504.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: 208,880

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.

SEC source: 0001828791-26-000046 · wk-form4_1781135976.xml · nonDerivative · entry 2

VALDES MAX O · CIK 0001219307 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,449

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at various prices ranging from $11.9456 to $12.01, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

F1 · balance_after: The prior Form 4 for the Reporting Person dated June 5, 2026 inadvertently reported 15,948 restricted stock units instead of 14,544, the correct amount actually granted. The current total number of securities beneficially owned following the reported transactions reflects the accurate number of shares held by the Reporting Person.

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · derivative · entry 18

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Stella Vanderhook Gift Trust

Disclosed balance after: 52,096

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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: 0001843103-26-000012 · wk-form4_1781136002.xml · derivative · entry 17

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Kingston Vanderhook Gift Trust

Disclosed balance after: 52,096

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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: 0001843103-26-000012 · wk-form4_1781136002.xml · derivative · entry 16

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Gray Vanderhook Gift Trust

Disclosed balance after: 52,096

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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: 0001843103-26-000012 · wk-form4_1781136002.xml · derivative · entry 15

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Eve Vanderhook Gift Trust

Disclosed balance after: 52,096

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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: 0001843103-26-000012 · wk-form4_1781136002.xml · derivative · entry 14

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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.

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F5 · ownership.nature: Securities held by the Stella Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · derivative · entry 13

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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.

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F4 · ownership.nature: Securities held by the Kingston Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · derivative · entry 12

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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.

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F3 · ownership.nature: Securities held by the Gray Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · derivative · entry 11

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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.

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F2 · ownership.nature: Securities held by the Eve Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · nonDerivative · entry 8

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Stella Vanderhook Gift Trust

Disclosed balance after: 52,096

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · nonDerivative · entry 7

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Kingston Vanderhook Gift Trust

Disclosed balance after: 52,096

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · nonDerivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Gray Vanderhook Gift Trust

Disclosed balance after: 52,096

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Eve Vanderhook Gift Trust

Disclosed balance after: 52,096

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F5 · ownership.nature: Securities held by the Stella Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F4 · ownership.nature: Securities held by the Kingston Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F3 · ownership.nature: Securities held by the Gray Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843103-26-000012 · wk-form4_1781136002.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F2 · ownership.nature: Securities held by the Eve Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · derivative · entry 18

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Colbie Vanderhook Gift Trust

Disclosed balance after: 52,096

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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: 0001843104-26-000012 · wk-form4_1781135953.xml · derivative · entry 17

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Clay Vanderhook Gift Trust

Disclosed balance after: 52,096

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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: 0001843104-26-000012 · wk-form4_1781135953.xml · derivative · entry 16

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Carter Vanderhook Gift Trust

Disclosed balance after: 52,096

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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: 0001843104-26-000012 · wk-form4_1781135953.xml · derivative · entry 15

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Hayden Vanderhook Gift Trust

Disclosed balance after: 52,096

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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: 0001843104-26-000012 · wk-form4_1781135953.xml · derivative · entry 14

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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.

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F5 · ownership.nature: Securities held by the Colbie Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · derivative · entry 13

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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.

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F4 · ownership.nature: Securities held by the Clay Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · derivative · entry 12

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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.

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F3 · ownership.nature: Securities held by the Carter Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · derivative · entry 11

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

Underlying: Class A Common Stock · 52,096 shares

Expires not disclosed

F7 · 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.

F7 · 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.

F7 · 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.

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F2 · ownership.nature: Securities held by the Hayden Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · nonDerivative · entry 8

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Colbie Vanderhook Gift Trust

Disclosed balance after: 52,096

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · nonDerivative · entry 7

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Clay Vanderhook Gift Trust

Disclosed balance after: 52,096

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · nonDerivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Carter Vanderhook Gift Trust

Disclosed balance after: 52,096

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Indirect · Hayden Vanderhook Gift Trust

Disclosed balance after: 52,096

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F5 · ownership.nature: Securities held by the Colbie Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F4 · ownership.nature: Securities held by the Clay Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F3 · ownership.nature: Securities held by the Carter Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001843104-26-000012 · wk-form4_1781135953.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By GRAT

Disclosed balance after: 0

F1 · balance_after: In addition to the gift transactions reported herein, reflects annuity payments by the GRATs to the Reporting Person pursuant to the terms of the GRAT, which annuity payments were exempt from reporting pursuant to Rule 16a-13.

F2 · ownership.nature: Securities held by the Hayden Vanderhook 2024 grantor retained annuity trust.

SEC source: 0001284309-26-000016 · wk-form4_1780964583.xml · nonDerivative · entry 2

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 484,531

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 $12.01 to $12.32. 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: 0001828791-26-000046 · wk-form4_1781135976.xml · nonDerivative · entry 1

VALDES MAX O · CIK 0001219307 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,835

F1 · balance_after: The prior Form 4 for the Reporting Person dated June 5, 2026 inadvertently reported 15,948 restricted stock units instead of 14,544, the correct amount actually granted. The current total number of securities beneficially owned following the reported transactions reflects the accurate number of shares held by the Reporting Person.

SEC source: 0001284309-26-000016 · wk-form4_1780964583.xml · nonDerivative · entry 1

MADDEN LARRY · CIK 0001284309 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 499,201

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 $12.05 to $12.895. 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: 0001219307-26-000002 · wk-form4_1780689815.xml · nonDerivative · entry 1

VALDES MAX O · CIK 0001219307 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,539

F1 · shares: Grant of restricted stock units that vest in full on the earlier of (i) the date of the Issuer's 2027 Annual Meeting of Stockholders (or the date immediately prior to the 2027 Annual Meeting if the Reporting Person's service as a director ends at the 2027 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: 0001612849-26-000003 · wk-form4_1780689835.xml · nonDerivative · entry 1

Wilson Brett · CIK 0001612849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,867

F1 · shares: Grant of restricted stock units that vest in full on the earlier of (i) the date of the Issuer's 2027 Annual Meeting of Stockholders (or the date immediately prior to the 2027 Annual Meeting if the Reporting Person's service as a director ends at the 2027 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: 0001615037-26-000002 · wk-form4_1780689855.xml · nonDerivative · entry 1

Yang Vivian · CIK 0001615037 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 109,861

F1 · shares: Grant of restricted stock units that vest in full on the earlier of (i) the date of the Issuer's 2027 Annual Meeting of Stockholders (or the date immediately prior to the 2027 Annual Meeting if the Reporting Person's service as a director ends at the 2027 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: 0001612849-26-000005 · wk-form4a_1781136020.xml · nonDerivative · entry 1

Wilson Brett · CIK 0001612849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,463

F1 · shares: Grant of restricted stock units ("RSUs") that vest in full on the earlier of (i) the date of the Issuer's 2027 Annual Meeting of Stockholders (or the date immediately prior to the 2027 Annual Meeting if the Reporting Person's service as a director ends at the 2027 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 RSU represents the right to receive one share of the Issuer's Class A common stock.

F2 · shares: This amendment is being filed to correct the number of RSUs granted to the Reporting Person on June 4, 2026. The original Form 4 inadvertently reported the grant of 15,948 RSUs instead of 14,544 RSUs, the correct amount actually granted.

SEC source: 0001615037-26-000004 · wk-form4a_1781136040.xml · nonDerivative · entry 1

Yang Vivian · CIK 0001615037 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,457

F1 · shares: Grant of restricted stock units ("RSUs") that vest in full on the earlier of (i) the date of the Issuer's 2027 Annual Meeting of Stockholders (or the date immediately prior to the 2027 Annual Meeting if the Reporting Person's service as a director ends at the 2027 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 RSU represents the right to receive one share of the Issuer's Class A common stock.

F2 · shares: This amendment is being filed to correct the number of RSUs granted to the Reporting Person on June 4, 2026. The original Form 4 inadvertently reported the grant of 15,948 RSUs instead of 14,544 RSUs, the correct amount actually granted.

SEC source: 0001843104-26-000010 · wk-form4_1779413712.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 $10.53 to $11.04. 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: 0001843103-26-000010 · wk-form4_1779413677.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 $10.53 to $11.04. 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: 0001828791-26-000042 · wk-form4_1779413646.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 $10.53 to $11.04. 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: 0001843104-26-000010 · wk-form4_1779413712.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 $10.31 to $10.96. 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: 0001843103-26-000010 · wk-form4_1779413677.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 $10.31 to $10.96. 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: 0001828791-26-000042 · wk-form4_1779413646.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 $10.31 to $10.96. 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: 0001843104-26-000010 · wk-form4_1779413712.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: 9,094,775

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: 0001843104-26-000010 · wk-form4_1779413712.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 $10.565 to $11.20. 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.