[144] INTEGRAL AD SCIENCE HOLDING CORP. SEC Filing

Rhea-AI Filing Summary

Integral Ad Science Holding Corp. (IAS) Form 144 notice reports a proposed sale of 1,992 common shares through Fidelity Brokerage Services LLC on or about 10/02/2025, with an aggregate market value of $20,280.15. The filer states these shares were acquired on 10/01/2025 through restricted stock vesting and the payment type is listed as compensation. The filing also discloses three prior open-market sales by the same person: 1,962 shares on 07/07/2025 for $16,539.47, 2,784 shares on 09/03/2025 for $24,995.59, and 25,901 shares on 09/24/2025 for $263,771.71. The form notes 166,163,514 shares outstanding for the issuer and includes the required representation that the seller is not aware of undisclosed material adverse information.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	1992	20280.15	166163514	10/02/2025	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	10/01/2025	Restricted Stock Vesting	Issuer			1992	10/01/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Alexis Gil II 12 E 49th Street 20th Floor New York NY 10017	Common	07/07/2025	1962	16539.47
Alexis Gil II 12 E 49th Street 20th Floor New York NY 10017	Common	09/03/2025	2784	24995.59
Alexis Gil II 12 E 49th Street 20th Floor New York NY 10017	Common	09/24/2025	25901	263771.71

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the IAS Form 144 filed here report?

The notice reports a proposed sale of 1,992 common shares of IAS through Fidelity on or about 10/02/2025 with an aggregate market value of $20,280.15.

Who acquired the shares and how were they acquired?

The 1,992 shares were acquired on 10/01/2025 by the filer via restricted stock vesting, and the nature of payment is listed as compensation.

What recent sales by the same person are disclosed in the filing?

The filer sold 1,962 shares on 07/07/2025 for $16,539.47, 2,784 shares on 09/03/2025 for $24,995.59, and 25,901 shares on 09/24/2025 for $263,771.71.

What is the issuer's number of shares outstanding reported in the Form 144?

The filing lists 166,163,514 shares outstanding for the issuer.

Through which broker will the proposed sale be executed?

The proposed sale is listed with Fidelity Brokerage Services LLC, address shown as 900 Salem Street, Smithfield, RI.