RGEN Form 3 — Chief Accounting Officer V. Hughes Reports Zero Holdings

Rhea-AI Filing Summary

Violetta Hughes, identified as Chief Accounting Officer of Repligen Corporation (RGEN), filed an initial Form 3 reporting the event dated 09/01/2025. The filing states that no securities are beneficially owned by the reporting person. The form is signed by Violetta Hughes on 09/04/2025 and references an attached Power of Attorney (Exhibit 24.1). The document is an initial ownership disclosure and contains no entries in the non-derivative or derivative securities tables.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Hughes Violetta

(Last) (First) (Middle)

C/O REPLIGEN CORPORATION

41 SEYON ST., BLDG 1, STE 100

(Street)

WALTHAM MA 02453

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
09/01/2025

3. Issuer Name and Ticker or Trading Symbol
REPLIGEN CORP [ RGEN ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF ACCOUNTING OFFICER

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24.1: Power of Attorney

No securities are beneficially owned.

	/s/ Violetta Hughes	09/04/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did the Repligen (RGEN) Form 3 filed by Violetta Hughes disclose?

The filing discloses that Violetta Hughes, the Chief Accounting Officer, filed an initial Form 3 and reported no beneficial ownership of Repligen securities as of 09/01/2025.

Does the Form 3 show any stock options or derivative holdings for the reporting person?

No. The filing contains no entries in Table I or Table II and explicitly states no securities are beneficially owned.

When was the Form 3 signed and filed by the reporting person?

The Form 3 is signed by Violetta Hughes on 09/04/2025 and the event date listed is 09/01/2025.

What is the reporting person's relationship to Repligen (RGEN)?

The filer is listed as an Officer with the title Chief Accounting Officer.

Does the Form 3 include any exhibits or authorizations?

Yes. The filing references Exhibit 24.1, which is the Power of Attorney.