Facility	City	Industry	Status	Distance
Sipex Corporation	Billerica	Other Electronic Component Manufacturing 334419	UNVERIFIED	0.4 KM
Rsa	Bedford	Computer Storage Device Manufacturing 334112	UNVERIFIED	0.6 KM
Excelitas Technologies	Billerica	Semiconductor and Related Device Manufacturing 334413	LIKELY ACTIVE	0.5 KM
Em4, LLC	Bedford	Semiconductor and Related Device Manufacturing 334413	ACTIVE	1.3 KM
Persimmon Technologies Corporation	Bedford	Semiconductor and Related Device Manufacturing 334413	LIKELY ACTIVE	2.2 KM

Every listed plant in Middlesex County

Also at this address

3 other records share this street address. Separate filings can describe distinct businesses on one site, or the same plant recorded by different agencies, so every record is kept rather than merged away.

Aotco Billerica Building 4

WHERE THIS RECORD COMES FROM — 2 FEDERAL SOURCES, 6 FIELDS

Every fact on this page traces to a public federal filing. The table below names which register holds this facility, whether that register proves the plant operates or only that it exists, and when each of them last saw it.

EPA cross-references this facility in AIR, AIRS/AFS, BR, EIS, MA-EPICS, RCRAINFO, TRIS · EPA site type STATIONARY.

Source	Evidence	First seen	Last seen
EPA FRS	EXISTENCE	JUN 2017	JUN 2017
EPA ECHO	OPERATING	NOV 2004	NOV 2004

FIELD BY FIELD — WHICH SOURCE SUPPLIED WHAT

FIELD	SOURCE	SIGNAL
ADDRESS LINE1	EPA FRS	JUL 2026
CITY	EPA FRS	JUL 2026
GEOM	EPA FRS	JUL 2026
NAME	EPA FRS	JUL 2026
RCRA GENERATOR STATUS	EPA ECHO	AUG 2026
STATE	EPA FRS	JUL 2026

Status is computed from independent sources; nothing here is self-reported unless marked Claimed.

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