Repligen (RGEN) Insider Notice: 29,111 Shares to Be Sold on NASDAQ

Rhea-AI Filing Summary

Repligen Corp (RGEN) filed a Form 144 reporting a proposed sale of 29,111 common shares through Fidelity Brokerage Services on NASDAQ, with an aggregate market value of $3,508,378.25 and approximately 56,257,618 shares outstanding. The filing shows 9,111 shares acquired via restricted stock vesting on 03/01/2022 as compensation, and 20,000 shares associated with options (options granted 03/01/2018) to be sold on 09/10/2025 for cash. The filer reports no sales in the past three months. The notice includes the filer’s attestation that they are not aware of any undisclosed material adverse information about the issuer.

Insights

Securities Analyst

TL;DR: Insider plans to sell 29,111 RGEN shares (approx. $3.51M) via Fidelity on NASDAQ; no recent sales reported.

The filing documents a routine Form 144 disclosure for an insider sale rather than a corporate action. The size of the proposed sale—29,111 shares representing a small fraction of 56,257,618 shares outstanding—appears unlikely to materially affect market capitalization by itself. The composition of the shares (9,111 from restricted stock vesting and 20,000 linked to options) indicates sales tied to typical compensation vesting and option exercise events. Absence of sales in the prior three months is noted. This is a compliance disclosure and does not provide operational or financial performance details.

Corporate Governance Expert

TL;DR: The Form 144 is a standard insider sale notice with required certifications; no allegations or unusual conditions disclosed.

The filing includes the mandatory attestation that the seller is unaware of undisclosed material adverse information, and identifies the broker (Fidelity Brokerage Services LLC). Dates and acquisition types are specified, supporting transparency around the insider's ability to sell. No prior three-month sales reduces concerns about rapid disposal patterns. The document contains no governance red flags or disclosures of special arrangements beyond normal compensation and option-related transactions.

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	29111	3508378.25	56257618	09/10/2025	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	03/01/2022	Restricted Stock Vesting	Issuer			9111	03/01/2022	Compensation
Common	09/10/2025	Options Granted - 03/01/2018	Issuer			20000	09/10/2025	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

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 does the Form 144 for Repligen (RGEN) disclose?

The filing discloses a proposed sale of 29,111 common shares via Fidelity on NASDAQ with aggregate market value of $3,508,378.25 and 56,257,618 shares outstanding.

When is the approximate date of sale reported in the RGEN Form 144?

The approximate sale date listed is 09/10/2025.

What is the origin of the shares to be sold in the RGEN filing?

The filing shows 9,111 shares from restricted stock vesting on 03/01/2022 (compensation) and 20,000 shares related to options granted on 03/01/2018 (to be sold for cash).

Has the filer sold RGEN securities in the past three months?

The filing states Nothing to Report for securities sold during the past three months.

Which broker is handling the proposed sale in the Form 144?

The broker named is Fidelity Brokerage Services LLC, address listed in the filing.