Identity graph
3SI Security Systems headquarters, locations and relationships
- Legal name
- 3SI Security Systems, Inc.
- Industry
- Software As A Service
- Founded
- 1971
- Phone
- +1 800 523 1430
- Website
- 3sisecurity.com
3SI Security Systems office locations
| City | State / region | Country | Type |
|---|---|---|---|
| Malvern | Pennsylvania | United States | Headquarters |
| — | — | Australia | Office |
| Brussels | Brussels Capital | Belgium | Office |
| Carry-le-Rouet | Provence-Alpes-Côte d'Azur | France | Office |
| Lille | Hauts-de-France | France | Office |
| Lyon | Rhône-Alpes | France | Office |
- Parent company
- 3SI Security Systems is part of LLR Partners.
Verified from public filings, company websites and news · Methodology
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About 3SI Security Systems
3SI Security Systems is headquartered in Malvern, Pennsylvania, United States. Founded in 1971, the company has 21 recorded locations across 6+ countries and employs approximately 250 people worldwide.
Where is 3SI Security Systems's main office?
3SI Security Systems's main headquarters office is located at 101 Lindenwood Drive Suite 200, Malvern, Pennsylvania 19355-1764, United States. This is the company's primary corporate address.
3SI Security Systems regional offices
Beyond its headquarters in Malvern, 3SI Security Systems has recorded locations in United States, Australia, Belgium, France, Mexico and United Kingdom.
3SI Security Systems contact information
The main switchboard for 3SI Security Systems headquarters can be reached at +1 800 523 1430. Official website: 3sisecurity.com.
What does 3SI Security Systems do?
Redefined Actionable Intelligence: With a fresh new look and a revolutionary purpose and mission, we are positioned to better serve our clients, partners, law enforcement, and communities with our cutting-edge technologies and real-world experience to deliver redefined actionable intelligence via an integrated platform that significantly impacts the bottom line - and, more importantly, lives. The Power of 3: At the core of the new 3Si is the Power of 3 - a comprehensive suite of solutions designed to deliver on the company’s promise of getting the Right Data to the Right People at the Right Time to contribute to a Safer World.
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Put 3SI Security Systems to work across your revenue bowtie
- Target Define the market Build the account list from companies shaped like your best customers, 3SI Security Systems included. Fingerprint search
- Cover Plan territories 3SI Security Systems's 21 locations roll up to one account, so it lands in one territory, once. Territory planning
- Engage Act on timing Leadership changes, funding and M&A arrive linked to the account, not a loose headline. Signal monitoring
- Convert Close on a resolved record Inbound and closed-won attach to one CRM record, with no duplicates to merge. CRM enrichment
- Retain Ground every answer Customer teams and AI agents answer from the same entity, with a source and a date. AI agent data layer
- Expand Find the next buyer inside Follow subsidiaries and divisions to the next team that can buy. Account expansion
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A B2B identity graph. It resolves each organization into one verified entity and maps its parent and subsidiaries, employees, competitors and news signals. Revenue teams use it in the product; AI agents query it through the REST API and MCP server.
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3SI Security Systems: frequently asked questions
Where is 3SI Security Systems headquarters?
101 Lindenwood Drive Suite 200, Malvern, Pennsylvania 19355-1764, United States.
What is 3SI Security Systems's phone number?
+1 800 523 1430 (headquarters).
When was 3SI Security Systems founded?
1971.
How many employees does 3SI Security Systems have?
About 250, as of October 2026 (GraphIQ.ai estimate).
How many offices does 3SI Security Systems have?
21 locations across 6+ countries, including Brussels, Carry-le-Rouet, Lille, Lyon.
Questions about GraphIQ.ai
Is GraphIQ.ai a list of companies like a spreadsheet?
No. Each organization resolves to one verified entity linked to its parent, subsidiaries, people and signals, so 3SI Security Systems here is the same 3SI Security Systems in your CRM, territory plan and agent answers.
Where does this 3SI Security Systems data come from?
Public filings, company websites and news, resolved to one entity and continuously updated.