REPLIGEN CORP Insider Trading Activity

Repligen Corporation director reported several transactions in company stock.

Rhea-AI Filing Summary

Repligen Corporation director reported several transactions in company stock. On 11/13/2025, the director sold multiple blocks of common stock in open-market transactions at weighted average prices ranging from $151.01 to $157.11, each sale covering different share amounts. After these sales, the director beneficially owned 80,743 shares of Repligen common stock in direct form. The director also exercised a stock option for 2,952 shares at an exercise price of $33.87, which increased directly held shares while reducing the option position.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 9 txns

Insider Hunt Anthony

Role Director

Sold 20,000 shs ($3.09M)

Approx. gross sale proceeds $3.09M

Approx. exercise cost $100K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy)	2,952	$0.00	$0.00
Sale	Common Stock	1,784	$151.01	$269K
Sale	Common Stock	2,100	$152.17	$320K
Sale	Common Stock	2,923	$153.14	$448K
Sale	Common Stock	2,500	$154.32	$386K
Sale	Common Stock	3,000	$155.45	$466K
Sale	Common Stock	5,737	$156.22	$896K
Sale	Common Stock	1,956	$157.11	$307K
Exercise	Common Stock	2,952	$33.87	$100K

Holdings After Transaction: Stock Option (Right to Buy) — 14,760 contracts (Direct); Common Stock — 83,695 shares (Direct)

Footnotes (8)

1. F1. $151.01 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $150.53 to $151.23, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.
2. F2. $152.17 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $151.57 to $152.45, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.
3. F3. $153.14 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $152.64 to $153.62, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.
4. F4. $154.32 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $153.66 to $154.60, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.
5. F5. $155.45 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $154.78 to $155.78, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.
6. F6. $156.22 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $155.79 to $156.76, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.
7. F7. $157.11 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $156.90 to $157.55, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.
8. F8. 14,760 of the shares underlying this option have vested. The remaining shares vest as follows: 2,952 shares on March 1, 2026, and 2,952 shares on March 1, 2027.

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Accepted by SEC EDGAR 11/14/2025 - 04:30 PM EST Learn about SEC filing dates

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^*

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)
11/13/2025

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	11/13/2025		S		1,784	D	$151.01(1)	98,959	D
Common Stock	11/13/2025		S		2,100	D	$152.17(2)	96,859	D
Common Stock	11/13/2025		S		2,923	D	$153.14(3)	93,936	D
Common Stock	11/13/2025		S		2,500	D	$154.32(4)	91,436	D
Common Stock	11/13/2025		S		3,000	D	$155.45(5)	88,436	D
Common Stock	11/13/2025		S		5,737	D	$156.22(6)	82,699	D
Common Stock	11/13/2025		S		1,956	D	$157.11(7)	80,743	D
Common Stock	11/13/2025		M		2,952	A	$33.87	83,695	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
Stock Option (Right to Buy)	$33.87	11/13/2025		M		2,952		(8)	02/29/2028	Common Stock	2,952	$0	14,760	D

Explanation of Responses:

1. $151.01 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $150.53 to $151.23, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

2. $152.17 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $151.57 to $152.45, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

3. $153.14 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $152.64 to $153.62, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

4. $154.32 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $153.66 to $154.60, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

5. $155.45 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $154.78 to $155.78, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

6. $156.22 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $155.79 to $156.76, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

7. $157.11 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $156.90 to $157.55, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

8. 14,760 of the shares underlying this option have vested. The remaining shares vest as follows: 2,952 shares on March 1, 2026, and 2,952 shares on March 1, 2027.

	/s/ Jennifer Carmichael (Attorney in Fact)	11/14/2025
	** 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 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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