ABIVAX Societe Anonyme Investigation - ABVX

Company: ABIVAX Societe Anonyme

Ticker: (NASDAQ) ABVX

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Certification of Plaintiff Pursuant to Federal Securities Laws

I, duly certify and say, as to the claims asserted under the federal securities laws, that:

1. I have reviewed a complaint filed in the action.

2. I did not purchase the security that is the subject of this action at the direction of plaintiff's counsel or in order to participate in this action.

3. I am willing to serve as a representative party on behalf of the class, including providing testimony at deposition and trial, if necessary.

4. My transaction(s) in ABIVAX Societe Anonyme which are the subject of this litigation during the class period set forth in the complaint are set forth in the chart attached hereto.

5. Within the last 3 years,

I have not sought to serve nor have I served as a class representative in any federal securities fraud case.
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6. I will not accept any payment for serving as a representative party on behalf of the class beyond the Plaintiff's pro rata share of any recovery, except as ordered or approved by the court, including any award for reasonable costs and expenses (including lost wages) directly relating to the representation of the class.

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Yes. I certify under penalty of perjury that the foregoing is true and correct. Executed this
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Signed pursuant to California Civil Code Section 1633.1, et seq. - and the Uniform Electronic Transactions Act as adopted by the various states and territories of the United States.

By your signature above, you confirm that have retained Levi & Korsinsky, LLP to represent you and the shareholder class as a lead plaintiff in the pending class action against ABIVAX Societe Anonyme. This representation will be on a contingency basis, meaning that Levi & Korsinsky will advance all expenses in the litigation and will only seek compensation and/or reimbursement of expenses if the firm obtains a recovery. Regardless of the result, we will never ask you to directly pay for any attorneys’ fees, expenses, or costs. Should we obtain a favorable result, we may ask the court to award us compensation and reimbursement of expenses to be paid by the defendants or as a portion of any class recovery. In exchange for our representation, you agree to cooperate as our client by providing, for example, relevant documents and deposition testimony, if necessary. During the course of this litigation, we may employ and/or work with other law firms, experts, and third-parties to successfully prosecute this action. If you are not appointed as the lead plaintiff or Levi & Korsinsky is not appointed as lead counsel, we will notify you of such decision at which time this representation will end unless otherwise extended by you and the firm. We look forward to working with you towards a successful resolution of this action.

I have reviewed the complaint linked in paragraph 1

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Investigation Details

Abivax shareholders lost more than 40% of their investment value on June 2, 2026, as the stock plunged from a pre-announcement close of approximately $129.69 to as low as $71 per share midday after rare malignancy cases surfaced in the company’s Phase 3 ABTECT ulcerative colitis trial for obefazimod. The market reaction was swift and severe. Trading volume surged to more than eight times the daily average on June 2. Jefferies downgraded ABVX from Buy to Hold and cut its price target from $160 to $90 — a 43.75% reduction — citing the cancer signal as a material overhang on the stock’s outlook. Short interest climbed to approximately 12% of the float within 24 hours of the disclosure.
Notably, the stock had initially rallied approximately 20% in after-hours trading on June 1 when the Phase 3 efficacy data were first released. Within hours, as the rare malignancy cases in the treatment arm received broader coverage, the rally reversed entirely and shares collapsed through the prior close. By the midday trading on June 2, ABVX had fallen more than 45%, erasing all gains since mid-August, 2025.