3si Security Systems INC

What they make

• crime intelligence
• government
• healthcare
• higher education
• logistics
• security teams
• law enforcement

NAMED ON THE COMPANY’S OWN WEBSITE, READ JUL 29, 2026

Products

Where it is

Other plants nearby

Facility	City	Industry	Status	Distance
Rajant CORP	Malvern	Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing 334220	● ACTIVE	1.2 KM
Ametek INC	Berwyn	All Other Miscellaneous Electrical Equipment and Component Manufacturing 335999	● ACTIVE	5.5 KM
WMWoodward Mccoach, LLC	West Chester	Telephone Apparatus Manufacturing 334210	● ACTIVE	7.8 KM
Microwave Photonic Systems INC	West Chester	Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing 334220	● ACTIVE	8.2 KM
Invisalert Solutions INC	West Chester	Other Communications Equipment Manufacturing 334290	● ACTIVE	12.0 KM

Every listed plant in Chester 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.

• The company’s own websiteOPERATING
  first seen JUL 2026 · last seen OCT 2026
• SAM.gov entity registrationOPERATING
  Record YA7YB56L3Y69 · first seen AUG 2025 · last seen AUG 2026
• DOL Form 5500 retirement plan filingsOPERATING
  Records 371434250|PA|19355|101 lindenwood dr, 371434250|PA|19355|101 lindenwood dr ste 200 · first seen DEC 2024 · last seen DEC 2024

IN CHESTER COUNTY9 other plants share this one’s industry (Communications Equipment Manufacturing, NAICS 3342); 1 of them has 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

SAM.gov: 3SI SECURITY SYSTEMS INC · AUG 2026

Street address

SAM.gov: 101 LINDENWOOD DR STE 200 · AUG 2026

City

SAM.gov: MALVERN · AUG 2026

State

SAM.gov: PA · AUG 2026

Coordinates

Census geocoder: 40.049576039592,-75.525236748891 · JUL 2026

Employees (band)

DOL: 100-499 · DEC 2024

Website

SAM.gov: http://www.3sisecurity.com · AUG 2026

CAGE code

SAM.gov: 4MNA1 · AUG 2026

Retirement plan filing (Form 5500)

DOL: 255 active participants, plan year ending 2024-12-31, 1 plan(s) · DEC 2024

SAM registration expires

SAM.gov: 2027-07-24 · AUG 2026

State business registrationSOURCES DISAGREE

CO SOS: 3SI Security Systems, Inc., registered with the Colorado Secretary of State; Corporation formed in Delaware; registered 2013-07-09; active, annual report filed 2026-09-24 · SEP 2026

DC Corporations: 3SI SECURITY SYSTEMS, Inc., registered with the District of Columbia Corporations Division; Corporation; registered 2013-07-09; active, annual report filed 2026-03-26 · MAR 2026

Sunbiz: 3SI SECURITY SYSTEMS, INC., registered with the Florida Department of State, Division of Corporations; Corporation formed in Delaware; registered 2014-03-21; active, annual report filed 2026-04-21 · APR 2026

IA SOS: 3SI SECURITY SYSTEMS, INC., registered with the Iowa Secretary of State; registered 2013-07-09; active · JUL 2013

OR SOS: 3SI SECURITY SYSTEMS, INC., registered with the Oregon Secretary of State, Corporation Division; Corporation formed in Delaware; registered 2013-07-09; active · JUL 2013

VA SCC: 3SI Security Systems, Inc., registered with the Virginia State Corporation Commission; Corporation formed in Delaware; registered 2013-07-10; revoked 2024-08-02 · AUG 2024