Repligen Corporation

41 Seyon St Ste 100 Bldg 1, Bldg 1, Suite 100, Waltham, MA 02453

LIKELY ACTIVELAST SEEN IN FEDERAL DATA AUG 2026 · 3 SOURCES

Operating signal within 24 months, or from a single source.

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What they make

Biological Product (except Diagnostic) Manufacturing325414

Products

Sold by REPLIGEN CORPORATION · 1

Laboratory Equipment And Supplies

Recorded against the company rather than this address. Federal award and drug records name the company, not the plant, so we cannot say which of its sites makes these.

Where these came from

1 from usaspending_psc · Federal registry

Supplied under federal award 75F40126P00067 (2026-05-28), PSC . An award shows what the government bought from this company; it does not establish which of its sites made it.

Where it is

42.37108, -71.21441 · CENSUS TIGER

COUNTY

Middlesex County

METRO AREA

Boston-Cambridge-Newton, MA-NH

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STREET VIEW

Open street-level view — OCT 2022

Other plants nearby

Facility	City	Industry	Status	Distance
Arranta Bio Ma LLC	Watertown	Biological Product (except Diagnostic) Manufacturing 325414	LIKELY ACTIVE	0.4 KM
Abcam Waltham	Waltham	In-Vitro Diagnostic Substance Manufacturing 325413	LIKELY ACTIVE	0.4 KM
Abcam INC	Waltham	In-Vitro Diagnostic Substance Manufacturing 325413	LIKELY ACTIVE	0.4 KM
EyePoint	Watertown	Pharmaceutical Preparation Manufacturing 325412	LIKELY ACTIVE	0.8 KM
American Research Products, INC	Waltham	Biological Product (except Diagnostic) Manufacturing 325414	ACTIVE	1.4 KM

Every listed plant in Middlesex County

Also at this address

No other federal record shares this street address.

Where this record comes from

3 sources hold this plant, and 11 fields on this page come from them. Each line is one agency’s own record of it: the identifier it is filed under, whether that record shows the plant operating or only that it exists, and when the register first and last saw it there.

EPA cross-references this facility in MA-EPICS, RCRAINFO · EPA site type STATIONARY.

SAM.gov entity registrationOPERATING
Record H9J9D228RFQ9 · first seen OCT 2025 · last seen AUG 2026
DOL Form 5500 retirement plan filingsOPERATING
Record 042729386|MA|02453|41 seyon st blg 1 ste 100 · first seen DEC 2024 · last seen DEC 2024
EPA Facility Registry ServiceEXISTENCE
Record 110014367826 · first seen JUN 2014 · last seen JUN 2014

IN MIDDLESEX COUNTY201 other plants share this one’s industry (Pharmaceutical and Medicine Manufacturing, NAICS 3254); 42 of them have a size band on record.

What each source says

Every field below, as each source filed it. The value this page shows is marked; where the sources disagree, the field says so. Status is computed from independent sources; nothing here is self-reported unless marked Claimed.

Name: EPA: REPLIGEN CORPORATION · JUL 2026 · ON THIS PAGE; SAM.gov: REPLIGEN CORPORATION · AUG 2026 · ON THIS PAGE
Street addressSOURCES DISAGREE: EPA: 41 SEYON ST · JUL 2026; SAM.gov: 41 SEYON ST STE 100 BLDG 1 · AUG 2026 · ON THIS PAGE
City: EPA: WALTHAM · JUL 2026 · ON THIS PAGE; SAM.gov: WALTHAM · AUG 2026 · ON THIS PAGE
State: EPA: MA · JUL 2026 · ON THIS PAGE; SAM.gov: MA · AUG 2026 · ON THIS PAGE
County (FIPS code): EPA: 25017 · SEP 2026
Coordinates: Census geocoder: 42.371079751061,-71.214411860349 · JUL 2026 · ON THIS PAGE; EPA: 42.371019,-71.214403 · JUL 2026 · ON THIS PAGE
Employees (band): DOL: 500+ · DEC 2024
CAGE code: SAM.gov: 1FHH9 · AUG 2026
Retirement plan filing (Form 5500): DOL: 1,126 active participants, plan year ending 2024-12-31, 1 plan(s) · DEC 2024
SAM registration expires: SAM.gov: 2027-08-04 · AUG 2026
State business registrationSOURCES DISAGREE: CO SOS: Repligen Corporation, registered with the Colorado Secretary of State; registered 2015-06-10; active, annual report filed 2026-08-25 · AUG 2026; TX Comptroller: REPLIGEN CORPORATION, registered with the Texas Comptroller of Public Accounts; Corporation; active

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