Thales Defense Security
Thales Defense & Security, Inc. (TDSI) is a U.S.-based company located in Clarksburg, Maryland, specializing in advanced defense and security solutions across various domains, including air, land, sea, and cyber. As a wholly owned subsidiary of the Thales Group, TDSI has a rich history dating back to 1964 and employs over 1,000 people. The company serves both domestic and international markets, focusing on defense, federal, and commercial sectors. TDSI offers a wide range of mission-critical technologies, including tactical communication systems, advanced visualization and targeting solutions, electronic warfare and sensor systems, navigation and air traffic management tools, and cybersecurity technologies. The company supports U.S. Joint Services, special operations forces, and multinational partners, ensuring compliance with U.S. defense requirements. With the backing of Thales Group's global technology portfolio, TDSI delivers integrated solutions that enhance mission success for its customers.
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Headcount trend
Thales Defense Security went from 523 employees in Jul 2023 to 667 in Jun 2025. Jan to Jun 2025: 52 people joined, 23 left.
Headcount data through Jun 2025
Org structure
Headcount by department
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Thales Defense Security FAQ
How many employees does Thales Defense Security have?
Thales Defense Security has about 667 employees, up 1.7% over the 3 months to Jun 2025.
What is Thales Defense Security's revenue per employee?
Thales Defense Security makes about $120K in revenue per employee, based on $80M annual revenue and 667 employees.
Data from Company Prospectus, DOL LCA disclosures, WARN notices and 6figr salary profiles.