SEC Form 4 · Updated Daily

RGEN

— REPLIGEN CORPORATION Ownership

Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.

Financials Ownership

Current Reporting Owners

Owner	Role	Shares Owned	As Of	Last Activity
BVF PARTNERS L P/IL	10%+ Owner	3,106,050	2009-07-06	S
BIOTECHNOLOGY VALUE FUND L P	10%+ Owner	3,106,050	2009-07-06	S
BIOTECHNOLOGY VALUE FUND II LP	Reporting Owner	3,106,050	2009-07-06	S
BVF INC/IL	10%+ Owner	3,106,050	2009-07-06	S
LAMPERT MARK N	10%+ Owner	3,106,050	2009-07-06	S
BVF INVESTMENTS LLC	Reporting Owner	3,106,050	2009-07-06	S
EDDLEMAN ROY T	10%+ Owner	720,000	2018-08-09	S
SCHIMMEL PAUL	Director	665,106	2007-06-14	M
RICH ALEXANDER	Director	441,500	2008-09-09	M
HERLIHY WALTER C	Director · Officer	262,430	2015-05-12	S
RUSCHE JAMES R	Officer	101,935	2016-02-26	A
DAWES KAREN A	Director	92,816	2026-05-14	A
Hunt Anthony	Director	89,062	2026-03-02	F
WITT DANIEL P	Officer	80,833	2014-06-20	M
COOPER GLENN L MD	Director	64,709	2019-05-23	M
Loeillot Olivier	Director · Officer	49,990	2026-10-05	M
Benjamin Howard	Officer	46,637	2017-12-14	M
Goldberg Alfred Lewis	Director	40,331	2015-05-21	A
MUIR GLENN P	Director	40,051	2026-05-14	A
Snodgres Jon	Officer	37,381	2023-05-16	F
LANDY HAL	Officer	30,000	2007-06-19	M
Gebski Christine	Officer	27,419	2024-05-14	F
Bylund James	Officer	25,423	2026-03-05	A
GRIFFITH MICHAEL A	Director	25,274	2014-11-10	M
Henry Earl Webb	Director	21,380	2013-05-09	A
KURIYEL RALF	Officer	20,062	2026-03-05	A
Garland Jason K	Officer	18,408	2026-09-25	F
Lieber Jonathan I	Officer	15,000	2012-09-20	—
Whitehouse Laura	Officer	11,657	2006-02-28	M
Spurr Robert	Officer	10,000	2012-03-12	—
DAY BARBARA BURNIM	Reporting Owner	10,000	2005-12-27	M
Harris Timothy Scott	Reporting Owner	10,000	2006-01-19	A
MUEHL DANIEL W	Officer	10,000	2006-01-19	A
Douglass Brian Robb	Officer	8,685	2026-10-06	A
Hughes Violetta	Officer	6,608	2026-03-05	A
Madaus Martin D	Director	6,581	2026-05-14	A
EGLINTON MANNER CARRIE	Director	5,461	2026-05-14	A
Kelly William J	Officer	5,456	2014-02-27	A
BARTHELEMY NICOLAS	Director	5,436	2026-05-14	A
Mhatre Rohin	Director	5,014	2026-05-14	A
Hall Michael	Officer	5,000	2012-03-12	—
Konstantinov Konstantin	Director	3,889	2026-05-14	A
RYAN THOMAS F JR	Director	3,457	2022-03-01	M
Pax Margaret	Director	3,011	2026-05-14	A
Cox John	Director	923	2020-03-24	S

Recent Filings

Date	Owner	Activity	Shares	Price	Owned After
2026-10-06	Douglass Brian Robb	Grant / award (derivative)	675	$0.00	675
2026-10-06	Douglass Brian Robb	Grant / award	700	$0.00	8,685
2026-10-05	Loeillot Olivier	Option exercise (derivative)	4,202	$0.00	8,405
2026-10-05	Loeillot Olivier	Option exercise	4,202	$154.96	49,990
2026-10-05	Loeillot Olivier	Open-market sale	1,333	$178.75	45,788
2026-10-02	Loeillot Olivier	Tax withholding	1,248	$181.70	47,121
2026-09-25	Garland Jason K	Tax withholding	421	$189.68	18,408
2026-09-24	Loeillot Olivier	Option exercise (derivative)	4,542	$0.00	9,085
2026-09-24	Loeillot Olivier	Option exercise (derivative)	8,404	$0.00	12,607
2026-09-24	Loeillot Olivier	Option exercise	4,542	$155.38	52,911
2026-09-24	Loeillot Olivier	Open-market sale	8,404	$190.00	48,369
2026-09-24	Loeillot Olivier	Option exercise	8,404	$154.96	56,773
2026-09-21	Loeillot Olivier	Option exercise (derivative)	5,426	$0.00	5,426
2026-09-21	Loeillot Olivier	Open-market sale	5,426	$180.00	48,369
2026-09-21	Loeillot Olivier	Option exercise	5,426	$141.79	53,795
2026-09-04	Loeillot Olivier	Open-market sale	3,035	$165.90	48,369
2026-09-03	Loeillot Olivier	Tax withholding	2,842	$169.61	51,404
2026-09-01	Hughes Violetta	Tax withholding	277	$170.02	6,331
2026-08-20	Loeillot Olivier	Option exercise (derivative)	5,426	$0.00	10,852
2026-08-20	Loeillot Olivier	Open-market sale	5,426	$180.00	54,246
2026-08-20	Loeillot Olivier	Option exercise	5,426	$141.79	59,672
2026-07-16	Garland Jason K	Open-market sale	530	$150.00	18,829
2026-06-25	Garland Jason K	Open-market sale	733	$145.00	19,359
2026-05-14	BARTHELEMY NICOLAS	Grant / award (derivative)	2,239	$0.00	2,239
2026-05-14	BARTHELEMY NICOLAS	Grant / award	995	$0.00	5,436
2026-05-14	MUIR GLENN P	Grant / award (derivative)	2,239	$0.00	2,239
2026-05-14	MUIR GLENN P	Grant / award	995	$0.00	40,051
2026-05-14	DAWES KAREN A	Grant / award (derivative)	2,239	$0.00	2,239
2026-05-14	DAWES KAREN A	Grant / award	995	$0.00	92,816
2026-05-14	Pax Margaret	Grant / award (derivative)	2,239	$0.00	2,239
2026-05-14	Pax Margaret	Grant / award	995	$0.00	3,011
2026-05-14	EGLINTON MANNER CARRIE	Grant / award (derivative)	2,239	$0.00	2,239
2026-05-14	EGLINTON MANNER CARRIE	Grant / award	995	$0.00	5,461
2026-05-14	Mhatre Rohin	Grant / award (derivative)	2,239	$0.00	2,239
2026-05-14	Mhatre Rohin	Grant / award	995	$0.00	5,014
2026-05-14	Konstantinov Konstantin	Grant / award (derivative)	2,239	$0.00	2,239
2026-05-14	Konstantinov Konstantin	Grant / award	995	$0.00	3,889
2026-05-14	Madaus Martin D	Grant / award (derivative)	2,239	$0.00	2,239
2026-05-14	Madaus Martin D	Grant / award	995	$0.00	6,581
2026-05-07	Douglass Brian Robb	Tax withholding	334	$126.43	7,985

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.