Olivier Loeillot - 27 Feb 2026 Form 4 Insider Report for REPLIGEN CORP (RGEN)

Role: Chief Executive Officer, Director
Signature: /s/ Jennifer Carmichael (Attorney in Fact)
Issuer symbol: RGEN
Transactions as of: 27 Feb 2026
Net transactions value: -$245,485
Form type: 4
Filing time: 03 Mar 2026, 13:39:26 UTC
Previous filing: 26 Nov 2025
Next filing: 23 Mar 2026
SEC: View on sec.gov

Quoteable Key Fact

"Olivier Loeillot filed Form 4 for REPLIGEN CORP (RGEN) on 03 Mar 2026."

Quick Takeaways

This page summarizes Olivier Loeillot's Form 4 filing for REPLIGEN CORP (RGEN).
2 reported transactions and 0 derivative rows are listed below.
Filing timestamp: 03 Mar 2026, 13:39.

What Changed

Previous filing in this sequence was filed on 26 Nov 2025.
Current net transaction value: -$245,485.

Why This Matters

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Official SEC Source

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

See Original Filing

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Loeillot Olivier	Chief Executive Officer, Director	C/O REPLIGEN CORPORATION, 41 SEYON ST., BLDG 1, STE 100, WALTHAM	/s/ Jennifer Carmichael (Attorney in Fact)	03 Mar 2026	0001995525

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RGEN	Common Stock	Tax liability	$44,283	-344	-0.96%	$128.73	35,554	27 Feb 2026	Direct	F1
transaction	RGEN	Common Stock	Tax liability	$201,202	-1,610	-4.5%	$124.97	33,944	02 Mar 2026	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.