INTEGRAL AD SCIENCE HOLDING CORP. — Director's Dealing 2021

Jun 30, 2021

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: INTEGRAL AD SCIENCE HOLDING CORP. (IAS)
CIK: 0001842718
Period of Report: 2021-06-29

Reporting Person: Atlas Venture Fund VIII, L.P. (10% Owner)
Reporting Person: Atlas Venture Associates VIII, L.P. (10% Owner)
Reporting Person: Atlas Venture Associates VIII, Inc. (10% Owner)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common stock, $0.001 par value	22722770	Indirect

Footnotes

F1: Includes 22,722,770 shares held directly by Atlas Venture Fund VIII, L.P. ("Atlas VIII"). Atlas Venture Associates VIII, L.P. ("AVA VIII LP") is the sole general partner of Atlas VIII. Atlas Venture Associates VIII, Inc. ("AVA VIII Inc.") is the sole general partner of AVA VIII LP. Each of Atlas VIII, AVAI VIII LP and AVA VIII Inc. disclaim beneficial ownership of all shares except to the extent of its pecuniary interest, if any, therein. This report shall not be deemed to be an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purpose.