Repligen (RGEN) SVP R&D reports PSU vesting and tax-withheld shares

Rhea-AI Filing Summary

Repligen Corp Senior VP R&D Ralf Kuriyel reported equity compensation activity involving common stock. He acquired 125 shares at no cost upon vesting of a previously granted performance stock unit award, after the company met pre-set performance goals. To cover related tax obligations, 42 shares were disposed of and withheld by the company, leaving him with 14,778 directly owned shares.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider KURIYEL RALF

Role Senior VP, R&D

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	125	$0.00	--
Tax Withholding	Common Stock	42	$125.84	$5K

Holdings After Transaction: Common Stock — 14,820 shares (Direct)

Footnotes (1)

1. Represents 125 shares issued pursuant to a Performance Stock Unit ("PSU") award granted to the Issuer on January 1, 2025. The Compensation Committee authorized the issuance of the underlying shares based upon the Issuer's achievement of pre-established performance criteria set forth in the PSU award. Represents the number of shares withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon the release of the performance stock units.

Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

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^*

KURIYEL RALF

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Senior VP, R&D

3. Date of Earliest Transaction (Month/Day/Year)
03/04/2026

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	03/04/2026		A		125(1)	A	$0.00	14,820	D
Common Stock	03/04/2026		F		42(2)	D	$125.84	14,778	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 125 shares issued pursuant to a Performance Stock Unit ("PSU") award granted to the Issuer on January 1, 2025. The Compensation Committee authorized the issuance of the underlying shares based upon the Issuer's achievement of pre-established performance criteria set forth in the PSU award.

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

	/s/ Jennifer Carmichael (Attorney in Fact)	03/05/2026
	** 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).
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 insider transactions did RGEN executive Ralf Kuriyel report?

Ralf Kuriyel reported an acquisition of 125 Repligen common shares from a vested performance stock unit award and a disposition of 42 shares withheld to satisfy tax obligations, resulting in 14,778 shares held directly after these routine equity compensation events.

How many Repligen (RGEN) shares did the executive receive from PSUs?

He received 125 Repligen common shares issued under a performance stock unit award granted on January 1, 2025. The Compensation Committee authorized the issuance after the company achieved pre-established performance criteria defined in that PSU award agreement.

Why were 42 Repligen (RGEN) shares disposed of in this Form 4?

The 42 Repligen shares were withheld by the company to satisfy tax withholding obligations triggered when the performance stock units vested. This tax-withholding disposition did not represent an open-market sale initiated for investment purposes.

What is Ralf Kuriyel’s share ownership in Repligen (RGEN) after these transactions?

Following the reported PSU-related acquisition and tax-withholding disposition, Ralf Kuriyel directly owns 14,778 shares of Repligen common stock. This total reflects his updated beneficial ownership after the March 4, 2026 equity compensation events.

How was the Repligen (RGEN) PSU award that generated these shares determined?

The PSU award, granted on January 1, 2025, vested into 125 Repligen shares after the Compensation Committee confirmed the company met pre-established performance criteria. Those criteria and outcomes governed how many shares were ultimately issued to the reporting person.