[144] INTEGRAL AD SCIENCE HOLDING CORP. SEC Filing

Rhea-AI Filing Summary

Form 144 notice from Integral Ad Science Holding Corp. (IAS) reports a proposed sale of 25,901 common shares through Fidelity Brokerage Services on 09/24/2025 on NASDAQ with an aggregate market value of $263,771.71. The filing lists the company's outstanding shares as 166,163,514. The shares to be sold were acquired through restricted stock vesting on multiple dates between 07/01/2024 and 09/01/2025, totaling the lots shown in the table. The filer also reported two completed sales in the past three months by Alexis Gil II: 1,962 shares on 07/07/2025 for $16,537.47 and 2,784 shares on 09/03/2025 for $24,995.59. The notice includes the standard certification that the seller is not aware of undisclosed material adverse information.

Positive

• Planned sale fully disclosed with broker, date, and aggregate market value
• Acquisition history provided showing shares came from restricted stock vesting
• Two recent sales reported with dates and gross proceeds, increasing transparency
• Filer includes standard representation that no undisclosed material adverse information is known

Negative

• Insider selling shares which may be perceived negatively by some investors
• No accompanying operational or financial context to explain the sales beyond compensation vesting

Insights

Securities Analyst

TL;DR: Routine insider sale notice; planned disposition and recent small sales disclosed, no new operational or financial information provided.

The Form 144 documents a proposed sale of 25,901 common shares acquired via restricted stock vesting across multiple dates and identifies the broker and intended sale date. The filing provides market value and outstanding share count but contains no financial results or forward-looking disclosures. For investors, this is a transparency event about insider liquidity rather than a signal of company performance.

Corporate Governance Expert

TL;DR: Compliance-focused filing showing insider compliance with Rule 144; includes prior small sales and signer representation about material non-public information.

The notice fulfills Rule 144 disclosure requirements by listing acquisition dates, nature of acquisition (restricted stock vesting), sale logistics and recent disposals by Alexis Gil II. It also contains the signature representation regarding absence of undisclosed material adverse information. The document is procedural and aligns with standard insider reporting practices.

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	25901	263771.71	166163514	09/24/2025	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	07/01/2024	Restricted Stock Vesting	Issuer			1126	07/01/2024	Compensation
Common	10/01/2024	Restricted Stock Vesting	Issuer			1117	10/01/2024	Compensation
Common	12/01/2024	Restricted Stock Vesting	Issuer			3729	12/01/2024	Compensation
Common	01/01/2025	Restricted Stock Vesting	Issuer			1038	01/01/2025	Compensation
Common	03/01/2025	Restricted Stock Vesting	Issuer			4426	03/01/2025	Compensation
Common	04/01/2025	Restricted Stock Vesting	Issuer			1122	04/01/2025	Compensation
Common	06/01/2025	Restricted Stock Vesting	Issuer			4860	06/01/2025	Compensation
Common	07/01/2025	Restricted Stock Vesting	Issuer			3556	07/01/2025	Compensation
Common	09/01/2025	Restricted Stock Vesting	Issuer			4927	09/01/2025	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	16537.47
Alexis Gil II 12 E 49th Street 20th Floor New York NY 10017	Common	09/03/2025	2784	24995.59

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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 shares does the IAS Form 144 propose to sell?

The filing proposes the sale of 25,901 common shares of Integral Ad Science Holding Corp.

When and where is the proposed sale scheduled for IAS (ticker IAS)?

The proposed sale is scheduled on 09/24/2025 through Fidelity Brokerage Services on NASDAQ.

What is the aggregate market value of the planned IAS sale?

The aggregate market value is reported as $263,771.71.

How were the shares being sold acquired?

All listed shares were acquired via restricted stock vesting on multiple dates from 07/01/2024 to 09/01/2025 and recorded as compensation.

Did the filer report any recent IAS share sales?

Yes. Alexis Gil II sold 1,962 shares on 07/07/2025 for $16,537.47 and 2,784 shares on 09/03/2025 for $24,995.59.

Does the Form 144 claim any undisclosed material information about IAS?

The signer represents they do not know any material adverse information about the issuer that has not been publicly disclosed.