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

Dec 24, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: INTEGRAL AD SCIENCE HOLDING CORP. (IAS)
CIK: 0001842718
Period of Report: 2025-12-23

Reporting Person: BERKES OTTO (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-23	Common Stock, $0.001 par value	D	80601	$10.30	Disposed	0	Direct

Footnotes

F1: Pursuant to the Agreement and Plan of Merger, dated as of September 24, 2025 (the "Merger Agreement"), by and among the Issuer, Igloo Group Parent, Inc. ("Parent") and Igloo Group Acquisition Company, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer surviving as a wholly owned subsidiary of Parent. At the effective time of the Merger (the "Effective Time"), each issued and outstanding share of the Issuer's common stock, par value $0.001 per share ("Common Stock"), owned by the reporting person immediately prior to the Effective Time was automatically cancelled, extinguished and converted into the right to receive $10.30 per share in cash, without interest thereon (the "Per Share Price").

F2: The shares of Common Stock reported as disposed by the reporting person include 17,637 unvested restricted stock units ("Company RSUs") which were, at or immediately prior the Effective Time, fully vested, cancelled and converted into the right to receive, without interest, an amount in cash equal to the product of (i) the Per Share Price and (ii) the total number of shares of Common Stock subject to such Company RSUs.