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

Rhea-AI Filing Summary

Gil Alexis II, Chief Accounting Officer of Integral Ad Science Holding Corp. (IAS), reported a sale of 25,901 shares of common stock on 09/24/2025. The sales were effected under a Rule 10b5-1 trading plan adopted by the reporting person on June 12, 2025. The price reported is a weighted average of $10.18 per share, with individual sale prices ranging from $10.18 to $10.20 per share. Following the reported transaction, the reporting person beneficially owned 145,140 shares. The Form 4 was signed on behalf of the reporting person by power of attorney on 09/26/2025.

Positive

• Sale effected pursuant to a Rule 10b5-1 trading plan adopted on 06/12/2025
• Reporting person retains beneficial ownership of 145,140 shares following the transaction

Negative

• Disposition of 25,901 shares reported on 09/24/2025
• Weighted average sale price of $10.18 per share (range $10.18 to $10.20)

Insights

Financial Analyst

TL;DR: Insider sold 25,901 IAS shares under a pre-arranged 10b5-1 plan, retaining 145,140 shares.

The Form 4 discloses a non-derivative disposition of 25,901 shares executed on 09/24/2025 at a weighted average price of $10.18 per share. The sale was carried out pursuant to a Rule 10b5-1 trading plan adopted on 06/12/2025, which the filer cites as the basis for the transactions. After the sale the reporting person beneficially owns 145,140 shares. These are straightforward insider sale disclosures without accompanying financial results or other corporate actions.

Corporate Governance Specialist

TL;DR: Filing documents a routine, pre-planned insider sale with POA signature; no additional governance events disclosed.

The filing identifies the reporting person as Gil Alexis II, Chief Accounting Officer, and indicates the Form 4 was executed by a power of attorney on 09/26/2025. The explanatory note states the Rule 10b5-1 plan adoption date (06/12/2025) and provides a price range for the multiple transactions. The Form contains no mention of amendments, disclosures of related-party transactions, or other governance items.

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

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)
09/24/2025

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	09/24/2025		S		25,901(1)	D	$10.18(2)	145,140	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. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. Such Rule 10b5-1 trading plan was adopted by the Reporting Person on June 12, 2025.

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	09/26/2025
	** 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 insider activity did IAS (IAS) report on this Form 4?

The filing reports that Gil Alexis II sold 25,901 shares of IAS common stock on 09/24/2025.

Under what authority were the IAS shares sold?

The sales were effected pursuant to a Rule 10b5-1 trading plan adopted on 06/12/2025.

What price was reported for the shares sold by the IAS insider?

The reported weighted average price was $10.18 per share; individual sale prices ranged from $10.18 to $10.20.

How many IAS shares does the reporting person own after the sale?

The reporting person beneficially owned 145,140 shares following the reported transaction.

Who signed the Form 4 for the reporting person?

The Form 4 was signed by Yossi Almani, by Power of Attorney, dated 09/26/2025.

What is the reporting person's role at Integral Ad Science?

The reporting person is identified as Chief Accounting Officer and listed as an officer on the form.