NAICS 561621
Security Systems Services (except Locksmiths)
Federal contractor footprint · 90 profiled contractors
Combined Contractor Footprint
$3.1B
Obligations under NAICS 561621 across the 90 GovExpress-profiled contractors that report the code. Not total federal spending in the code, and not de-duplicated across corporate families that file under more than one parent record.
Top Federal Contractors — Security Systems Services (except Locksmiths)
Obligations under NAICS 561621 across the 90 GovExpress-profiled contractors that report the code. Not total federal spending in the code, and not de-duplicated across corporate families that file under more than one parent record.
- M. C. DEAN, INC.$795.3M
- COVENANT AVIATION SECURITY, LLC$466.2M
- CACI INTERNATIONAL INC$365.9M
- SERCO HOLDINGS LIMITED$345.9M
- THE GEO GROUP, INC.$146.2M
- ADVANCED TECHNOLOGY SYSTEMS COMPANY, INC. (OF VIRGINIA)$133.5M
- SECURITAS AB$117.9M
- WILLIAMS ELECTRIC CO INC$96.7M
- PARSONS CORPORATION$78.9M
- KBR, INC.$63.0M
Agencies Buying This Code
Estimated by weighting each profiled contractor's agency mix by its NAICS 561621 footprint. Directional, not an agency-by-code total.
Competing in NAICS 561621?
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Obligations under NAICS 561621 across the 90 GovExpress-profiled contractors that report the code. Not total federal spending in the code, and not de-duplicated across corporate families that file under more than one parent record. Spending data from FPDS-NG via USASpending.gov, read between 2026-09-22 and 2026-10-27. Standard 90-day reporting lag per FAR 4.606(c). Read the full methodology.