[Form 4] INTEGRAL AD SCIENCE HOLDING CORP. Insider Trading Activity

Rhea-AI Filing Summary

Integral Ad Science Holding Corp. (IAS) reporting person Gil Alexis II, Chief Accounting Officer, executed a mandatory sale of 1,992 shares of common stock on 10/02/2025 to cover tax obligations tied to the settlement of restricted stock units. The sale prices reported were a weighted average of $10.18 (transactions ranged from $10.18 to $10.20), and the reporting person remains a beneficial owner of 143,148 shares following the transaction. The Form 4 was signed under power of attorney on 10/06/2025, and the filer offered to provide detailed per‑trade pricing on request.

Positive

• Complete disclosure of sale quantity (1,992 shares) and weighted average price ($10.18)
• Significant retained stake after sale (143,148 shares), indicating continued insider ownership

Negative

• Disposition reduced holdings by 1,992 shares on 10/02/2025, though described as tax‑covering
• Price range reported as $10.18 to $10.20, with per‑trade breakdown not in the filing (available on request)

Insights

Corporate Governance Analyst

Insider sold a small portion of holdings to cover taxes; disclosure is complete.

The sale of 1,992 shares at a weighted average price of $10.18 reflects a common administrative action when restricted stock units vest and taxes are due. Because the filer retained 143,148 shares after the disposition, the transaction does not materially alter overall insider ownership percentages.

Risks are administrative rather than strategic: investors should note the sale was described as a mandatory sale to cover tax liability, and the reporting person offered to supply per‑trade price details on request; expect no immediate governance implications absent further sales within Q4 2025.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

Gil Alexis II

(Last) (First) (Middle)

C/O INTEGRAL AD SCIENCE HOLDING CORP.

12 E. 49TH STREET, 20TH FLOOR

(Street)

NEW YORK NY 10017

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
INTEGRAL AD SCIENCE HOLDING CORP. [ IAS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

3. Date of Earliest Transaction (Month/Day/Year)
10/02/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $0.001 par value	10/02/2025		S(1)		1,992	D	$10.18(2)	143,148	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Mandatory sale to cover tax liability associated with the settlement of restricted stock units.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $10.18 to $10.20 per share. The reporting person undertakes to provide to Integral Ad Science Holding Corp., any security holder of Integral Ad Science Holding Corp. 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 herein.

Remarks:

	/s/ Yossi Almani, by Power of Attorney	10/06/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did IAS insider Gil Alexis II disclose on Form 4?

The filing shows a mandatory sale of 1,992 shares on 10/02/2025 at a weighted average price of $10.18, leaving 143,148 shares beneficially owned.

Why were the 1,992 shares sold according to the filing?

The sale was a mandatory sale to cover tax liability associated with the settlement of restricted stock units.

What price range did the insider sale occur at?

The shares were sold in multiple transactions at prices ranging from $10.18 to $10.20, with a reported weighted average of $10.18.

How many shares does Gil Alexis II own after the transaction?

The reporting person beneficially owned 143,148 shares following the reported transactions.

Is additional trade‑level pricing available?

Yes. The reporting person committed to provide, upon request, full information about the number of shares sold at each separate price within the reported range.