Bridgette P. Heller - May 11, 2023 Form 4 Insider Report for INTEGRAL AD SCIENCE HOLDING CORP. (IAS)

Role: Director
Signature: /s/Anil Sukumaran, by Power of Attorney
Stock symbol: IAS
Transactions as of: May 11, 2023
Transactions value $: $0
Form type: 4
Date filed: 5/15/2023, 04:48 PM
Previous filing: Mar 10, 2023
Next filing: May 22, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IAS	Common Stock, $0.001 par value	Award	$0	+9.88K	+45.93%	$0.00	31.4K	May 11, 2023	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id	Content
F1	Represents Restricted Stock Units ("RSUs") which will be settled in shares of common stock of the Issuer and will vest in full on the anniversary of the grant date, subject to the Reporting Person's continued service with the Issuer.