[144] Abivax S.A. SEC Filing

Rhea-AI Filing Summary

ABVX: A stockholder filed a Form 144 to sell up to 1,200,000 ADS, with an aggregate market value of $111,300,000. The proposed sale is listed for approximately 10/28/2025 through Leerink Partners on the NASDAQ.

The securities were acquired in the IPO on 10/20/2023, with 1,200,000 ADS purchased from the issuer and paid in cash on 10/24/2023. Shares outstanding were 77,800,000; this is a baseline figure, not the amount being offered.

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
ADS	Leerink Partners 53 State St., 40th Floor Boston MA 02109	1200000	111300000.00	77800000	10/28/2025	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 *
ADS	10/20/2023	Purchased in IPO	Issuer			1200000	10/24/2023	Cash

* 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

Nothing to Report

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 did ABVX disclose in this Form 144?

A holder filed notice to sell up to 1,200,000 ADS on or about 10/28/2025.

What is the aggregate market value of the proposed ABVX sale?

The filing lists an aggregate market value of $111,300,000 for the 1,200,000 ADS.

Which broker and exchange are involved for ABVX?

The broker is Leerink Partners, and the shares are to be sold on NASDAQ.

When and how were the ABVX shares acquired?

They were purchased in the IPO on 10/20/2023 and paid in cash on 10/24/2023.

How many ABVX shares are outstanding?

The filing lists 77,800,000 shares outstanding.

What class of ABVX securities is included in the Form 144?

The filing covers ADS (American Depositary Shares).