[144] REPLIGEN CORP SEC Filing

RGEN filed a Form 144 reporting a proposed resale of 3,832 common shares through Fidelity Brokerage Services LLC, with the filing dated 04/21/2026.

Rhea-AI Filing Summary

RGEN filed a Form 144 reporting a proposed resale of 3,832 common shares through Fidelity Brokerage Services LLC, with the filing dated 04/21/2026. The shares arise from restricted stock vesting: 616 shares vested 02/27/2026 and 3,216 shares vested 03/01/2026, both tied to compensation.

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Corporate Filings Analyst

Routine resale notice for vested restricted stock totaling 3,832 shares.

This Form 144 notifies the market of a planned resale of common shares held at Fidelity Brokerage Services LLC. The filing attributes the shares to restricted stock vesting on 02/27/2026 and 03/01/2026, noted as compensation.

Cash‑flow treatment and proposed sale method beyond brokerage placement are not disclosed in the excerpt; timing and execution details depend on the holder and applicable resale conditions under Regulation 144.

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Accepted by SEC EDGAR 04/21/2026 - 12:44 PM 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	3832	536480.00	56331110	04/21/2026	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	02/27/2026	Restricted Stock Vesting	Issuer			616	02/27/2026	Compensation
Common	03/01/2026	Restricted Stock Vesting	Issuer			3216	03/01/2026	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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	04/21/2026
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/Wade Moss, 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)