INTEGRAL AD SCIENCE HOLDING CORP. — Director's Dealing 2025

Aug 5, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: INTEGRAL AD SCIENCE HOLDING CORP. (IAS)
CIK: 0001842718
Period of Report: 2025-08-02

Reporting Person: Utzschneider Lisa (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-08-02	Common Stock, $0.001 par value	M	19448	—	Acquired	390479	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-08-02	Market Stock Units	$	M	19448	Disposed		Common Stock, $0.001 par value (19448)	Direct

Footnotes

F1: Represents shares of common stock earned upon the vesting of market stock units granted on June 17, 2022.

F2: The number of market stock units reported represents the maximum possible number of shares that are eligible for vesting, which is 225% of the number of shares that would be earned at target. The minimum payout factor that must be achieved to earn any payout is 60%. The actual number of shares that will vest on each vesting date will be determined by comparing the price of common stock on the applicable vesting date to the price of common stock on April 29, 2022 (i.e., number of vested shares is equal to (i) the number of shares at target payout multiplied by (ii) (a) the average price of common stock for the 10 trading days immediately preceding the applicable vesting date divided by (b) the closing stock price on April 29, 2022).

F3: The market stock units vest 25% on May 2, 2023 and in equal installments every three months thereafter over a three year period, subject to continued employment.