Repligen (RGEN) director uses 9,897 shares to cover RSU taxes

Rhea-AI Filing Summary

REPLIGEN CORP director Anthony Hunt reported a tax-related share disposition. On the release of restricted stock units, 9,897 shares of common stock were withheld by the company to cover his tax withholding obligations at a reference price of $124.97 per share. After this non‑open‑market transaction, he directly owned 89,062 shares.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Hunt Anthony

(Last) (First) (Middle)

C/O REPLIGEN CORPORATION

41 SEYON ST., BLDG 1, STE 100

(Street)

WALTHAM MA 02453

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/02/2026		F		9,897(1)	D	$124.97	89,062	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the number of shares withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

	/s/ Jennifer Carmichael (Attorney in Fact)	03/03/2026
	** 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 4 (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).
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FAQ

What insider transaction did Anthony Hunt report at REPLIGEN (RGEN)?

Anthony Hunt reported a tax-withholding disposition of 9,897 REPLIGEN shares. The company withheld these shares upon RSU vesting to satisfy his tax obligations, rather than an open-market sale, and he continued to hold 89,062 shares afterward.

Was Anthony Hunt’s REPLIGEN Form 4 transaction a market sale?

No, the transaction was not an open-market sale. REPLIGEN withheld 9,897 shares from Anthony Hunt upon restricted stock unit release to cover tax withholding obligations, as described in the Form 4 footnote, instead of him selling shares into the market.

How many REPLIGEN (RGEN) shares were involved in Anthony Hunt’s tax withholding?

The Form 4 shows 9,897 shares of REPLIGEN common stock were withheld. These shares covered Anthony Hunt’s tax liabilities when his restricted stock units vested, according to the filing’s description of a tax-withholding disposition transaction.

What price per share was used for Anthony Hunt’s REPLIGEN tax-withholding disposition?

The filing reports a reference price of $124.97 per REPLIGEN share for the 9,897 withheld shares. This price is used to calculate the value of stock applied toward Anthony Hunt’s RSU-related tax obligations in the non-derivative transaction.

How many REPLIGEN (RGEN) shares does Anthony Hunt hold after this Form 4 transaction?

After the tax-withholding disposition, Anthony Hunt directly owned 89,062 REPLIGEN common shares. This post-transaction balance reflects shares remaining following the withholding of 9,897 shares to satisfy tax obligations tied to his restricted stock units.

What does transaction code F mean in Anthony Hunt’s REPLIGEN Form 4?

Transaction code F indicates payment of an exercise price or tax liability by delivering securities. In this REPLIGEN filing, 9,897 shares were withheld to cover Anthony Hunt’s RSU-related tax obligations, rather than being voluntarily sold on the open market.