Repligen director awarded RSUs and stock options

Q: What insider transactions did REPLIGEN CORP (RGEN) director Glenn P. Muir report?

Glenn P. Muir reported receiving 995 restricted stock units and stock options for 2,239 shares of Repligen common stock as equity compensation, with no open-market buying or selling. These awards increase his direct equity exposure to the company.

Q: What are the terms of Glenn P. Muir’s new stock options in REPLIGEN CORP (RGEN)?

Muir received stock options on 2,239 shares of Repligen common stock with an exercise price of $103.38 per share and an expiration date of May 14, 2036. The options vest on the same schedule as his restricted stock units.

Q: When do Glenn P. Muir’s new restricted stock units in REPLIGEN CORP (RGEN) vest?

The 995 restricted stock units vest in full on the earlier of May 14, 2027, one year from the grant date, or the date of Repligen’s next annual shareholder meeting. This creates a time-based vesting incentive linked to his continued board service.

Q: How many REPLIGEN CORP (RGEN) shares does Glenn P. Muir hold after these awards?

After the reported awards, Muir directly holds 40,051 shares of common stock and 2,239 stock options. The 995 restricted stock units will be settled in shares after vesting and his separation from the board, based on his deferral election.

Q: How will Glenn P. Muir’s restricted stock units in REPLIGEN CORP (RGEN) be settled?

Each of the 995 restricted stock units represents a right to receive one Repligen common share. After vesting, the shares will be issued following Muir’s separation from board service, under the company’s Deferred Compensation Plan for Non-Employee Directors.

REPLIGEN CORP director Glenn P. Muir reported routine equity compensation awards.

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Rhea-AI Filing Summary

REPLIGEN CORP director Glenn P. Muir reported routine equity compensation awards. He received 995 restricted stock units, each representing one share of common stock, which vest in full on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual shareholder meeting.

Muir also received stock options covering 2,239 shares of common stock at an exercise price of $103.38 per share, expiring on May 14, 2036, with the same vesting schedule. Following these awards, he holds 40,051 shares of common stock directly and 2,239 stock options. The RSUs will be settled in shares after his service as a director ends, in line with his deferral election.

Insider Trade Summary

Grant/Award: 3,234 shares

Grant/Award 2 txns

Insider MUIR GLENN P

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	2,239	$0.00	$0.00
Grant/Award	Common Stock	995	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 2,239 contracts (Direct); Common Stock — 40,051 shares (Direct)

Footnotes (2)

F1. Mr. Muir was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The Reporting Person has elected to defer settlement of these restricted stock units pursuant to the Repligen Corporation Deferred Compensation Plan for Non-Employee Directors. Once vested, the shares will be issued in accordance with the Reporting Person's deferral election following the separation of the Reporting Person's service as a Director. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.
F2. Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

Key Figures

Restricted stock units granted: 995 units Stock options granted: 2,239 options Option exercise price: $103.38/share +4 more

7 metrics

Restricted stock units granted 995 units Equity award to director Glenn P. Muir on May 14, 2026

Stock options granted 2,239 options New option award to director on May 14, 2026

Option exercise price $103.38/share Strike price for 2,239 stock options

Option expiration date May 14, 2036 Expiration for newly granted stock options

Shares held after transaction 40,051 shares Common stock directly owned by Muir post-award

Options held after transaction 2,239 options Total options reported following the grant

RSU vesting date reference May 14, 2027 Earliest full vesting date for RSUs and options

Key Terms

restricted stock units, Deferred Compensation Plan for Non-Employee Directors, Stock Option (Right to Buy), vests in full, +1 more

5 terms

restricted stock units financial

"Mr. Muir was awarded 995 restricted stock units."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Deferred Compensation Plan for Non-Employee Directors financial

"The Reporting Person has elected to defer settlement ... pursuant to the Repligen Corporation Deferred Compensation Plan for Non-Employee Directors."

Stock Option (Right to Buy) financial

"security_title: "Stock Option (Right to Buy)""

vests in full financial

"Award vests in full on the earlier of May 14, 2027, one year from grant date..."

contingent right financial

"Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock."

FAQ

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What insider transactions did REPLIGEN CORP (RGEN) director Glenn P. Muir report?

Glenn P. Muir reported receiving 995 restricted stock units and stock options for 2,239 shares of Repligen common stock as equity compensation, with no open-market buying or selling. These awards increase his direct equity exposure to the company.

What are the terms of Glenn P. Muir’s new stock options in REPLIGEN CORP (RGEN)?

Muir received stock options on 2,239 shares of Repligen common stock with an exercise price of $103.38 per share and an expiration date of May 14, 2036. The options vest on the same schedule as his restricted stock units.

When do Glenn P. Muir’s new restricted stock units in REPLIGEN CORP (RGEN) vest?

The 995 restricted stock units vest in full on the earlier of May 14, 2027, one year from the grant date, or the date of Repligen’s next annual shareholder meeting. This creates a time-based vesting incentive linked to his continued board service.

How many REPLIGEN CORP (RGEN) shares does Glenn P. Muir hold after these awards?

After the reported awards, Muir directly holds 40,051 shares of common stock and 2,239 stock options. The 995 restricted stock units will be settled in shares after vesting and his separation from the board, based on his deferral election.

How will Glenn P. Muir’s restricted stock units in REPLIGEN CORP (RGEN) be settled?

Each of the 995 restricted stock units represents a right to receive one Repligen common share. After vesting, the shares will be issued following Muir’s separation from board service, under the company’s Deferred Compensation Plan for Non-Employee Directors.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/18/2026 - 04:05 PM EDT

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
Estimated average burden
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^*

MUIR GLENN P

(Last)

(First)

(Middle)

C/O REPLIGEN CORPORATION

41 SEYON ST., BLDG 1, STE 100

(Street)

WALTHAM

MASSACHUSETTS

02453

(City)

(State)

(Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/14/2026		A		995⁽¹⁾	A	$0.00	40,051	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (Right to Buy)	$103.38	05/14/2026		A		2,239		05/14/2027⁽²⁾	05/14/2036	Common Stock	2,239	$0.00	2,239	D

Explanation of Responses:

1. Mr. Muir was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The Reporting Person has elected to defer settlement of these restricted stock units pursuant to the Repligen Corporation Deferred Compensation Plan for Non-Employee Directors. Once vested, the shares will be issued in accordance with the Reporting Person's deferral election following the separation of the Reporting Person's service as a Director. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

2. Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

	/s/ Jennifer Carmichael (Attorney in Fact)	05/18/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR