Repligen holder plans $503K share sale

Rule 144 notice reports planned sale of 3,035 Repligen common shares and discloses a recent 5,426-share sale.

Rhea-AI Filing Summary

REPLIGEN CORP (RGEN) has a notice of proposed sale of common stock filed under Rule 144 for the account of Olivier Loeillot. The notice covers 3,035 shares of common stock, related to restricted stock vesting on September 3, 2026, to be sold through Fidelity Brokerage Services LLC.

In the prior three months, Loeillot reported a separate sale of 5,426 shares of common stock for an aggregate consideration of $976,680.00.

Key Figures

Shares proposed for sale: 3,035 shares Aggregate market value of proposed sale: $503,506.50 Shares sold in past 3 months: 5,426 shares +2 more

5 metrics

Shares proposed for sale 3,035 shares Common stock covered by the current Rule 144 notice

Aggregate market value of proposed sale $503,506.50 Market value listed for the 3,035 shares of common stock

Shares sold in past 3 months 5,426 shares Common stock sale reported on August 20, 2026

Aggregate consideration for past 3-month sale $976,680.00 Total consideration for 5,426 shares sold on August 20, 2026

Vesting date of restricted stock September 3, 2026 Date tied to the 3,035 shares to be sold

Key Terms

Rule 144, Restricted Stock Vesting, attorney-in-fact

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting financial

"Common | 09/03/2026 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

attorney-in-fact regulatory

"as attorney-in-fact for Olivier Loeillot"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing disclose for REPLIGEN CORP (RGEN)?

It discloses that 3,035 shares of Repligen common stock are proposed to be sold under Rule 144 for the account of Olivier Loeillot, following restricted stock vesting on September 3, 2026, through Fidelity Brokerage Services LLC.

How many RGEN shares are proposed to be sold under this Rule 144 notice?

The notice covers a proposed sale of 3,035 shares of REPLIGEN CORP common stock, tied to restricted stock vesting on September 3, 2026, with Fidelity Brokerage Services LLC listed as the broker.

What is the reported market value of the RGEN shares covered by this Form 144?

The filing lists an aggregate market value of $503,506.50 for the 3,035 shares of Repligen common stock subject to the current Rule 144 notice, based on the information provided in the securities section.

What RGEN share sales has Olivier Loeillot made in the last three months?

The filing reports that Olivier Loeillot sold 5,426 shares of REPLIGEN CORP common stock on August 20, 2026 for total consideration of $976,680.00, as part of the “Securities Sold During The Past 3 Months” section.

Who is executing the planned sale of RGEN shares under this Form 144?

The broker listed is Fidelity Brokerage Services LLC, and the Form 144 is signed by Jennifer Ruchti as a duly authorized representative of Fidelity, acting as attorney-in-fact for Olivier Loeillot.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/04/2026 - 10:01 AM EDT Accepted by SEC EDGAR 09/04/2026 - 10:01 AM EDT Learn about SEC filing dates

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	0001995525
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	REPLIGEN CORP
SEC File Number	000-14656
Address of Issuer	41 SEYON STREET BUILDING 1, SUITE 100 WALTHAM MASSACHUSETTS 02453
Phone	7814499560
Name of Person for Whose Account the Securities are To Be Sold	Loeillot Olivier
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	Officer
Relationship to Issuer	Director

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	3035	503506.50	56435621	09/04/2026	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	09/03/2026	Restricted Stock Vesting	Issuer			3035	09/03/2026	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
Olivier Loeillot 41 Seyon Street Bldg. 1, Suite 100 Waltham MA 02453	Common	08/20/2026	5426	976680.00

144: Remarks and Signature

Remarks
Date of Notice	09/04/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/19/2025
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	/s/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Olivier Loeillot
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)