Industries › NAICS 561621
Industry · NAICS 561621 · sector 56 Administrative, support, waste management and remediation services
Security Systems Services (except Locksmiths)
Federal contract obligations classified under NAICS 561621, the organisations that win them and the agencies that award them.
USAspending caveat. Figures are obligations reported by federal agencies to USAspending.gov, not payments. In USAspending's words: "An outlay occurs when federal money is actually paid out, not just promised to be paid ('obligated')." "Every agency has a Senior Accountable Official who must officially certify that the quarterly financial data submitted by their agency is accurate and complete." "If there are any discrepancies in procurement data, FPDS is the authoritative source." Contract data for the Department of Defense and the U.S. Army Corps of Engineers is published with a 90-day delay. Data loaded 30 Sep 2026.
Federal agencies obligated $675M in contracts classified under NAICS 561621, Security Systems Services (except Locksmiths), in FY2026, and $3.0B over the five fiscal years since FY2023; the industry ranks 107 of 526 on this site.
Obligations were down 14% on FY2025 ($784M), with $0 so far in FY2027.
The largest recipient organisations over FY2022–FY2025 were M. C. Dean, Inc. ($395M), Serco Inc ($316M) and Paragon Systems Inc ($177M).
By place of performance, the most money went to VA, CA and DC.
Contract obligations by fiscal year
Compared with the largest industry FY2026
| Measure | This industry | Aircraft Manufacturing | All contracts |
|---|---|---|---|
| Contract obligations, FY2026 | $675M | $45B | $716B |
| Five-year total | $3.0B | $211B | $3.0T |
| Share of all contract obligations, five years | 0.1% | 7.1% | 100% |
Top contractors obligations, FY2022–FY2025
| # | Organisation | Obligations |
|---|---|---|
| 1 | M. C. Dean, Inc. | $395M |
| 2 | Serco Inc | $316M |
| 3 | Paragon Systems Inc | $177M |
| 4 | Johnson Controls Security Solutions LLC | $133M |
| 5 | Advanced Technology Systems Company, Inc. (of Virginia) | $125M |
| 6 | CACI International Inc | $120M |
| 7 | Triple Canopy Inc | $107M |
| 8 | General Dynamics Mission Systems, Inc. | $84M |
| 9 | Xator LLC | $81M |
| 10 | Johnson Controls Building Automation Systems, LLC | $65M |
| 11 | Chenega Integrated Security Solutions, LLC | $50M |
| 12 | Versar Security Systems, LLC | $48M |
| 13 | Scdatacom, LLC | $38M |
| 14 | Johnson Controls Fire Protection LP | $37M |
| 15 | Media Plumbing & Heating Inc | $32M |
| 16 | Birdi Systems, Inc. | $28M |
| 17 | KBR Wyle Services, LLC | $27M |
| 18 | Trofholz Technologies, Inc. | $26M |
| 19 | Srctec, LLC | $24M |
| 20 | Siemens Industry Inc | $22M |
| 21 | Hurtvet Subcontracting, Inc. | $22M |
| 22 | BCF Solutions, Inc. | $21M |
| 23 | ITM4G LLC | $21M |
| 24 | Evergreen Fire Alarms LLC | $20M |
| 25 | Olgoonik Solutions LLC | $19M |
$11M among the top 40 went to recipients not shown.
Buying agencies $1.0M+ awards
Where the work is performed
Largest awards since FY2023
| Recipient | Awarding agency | Type | Award value | Begun | Place | Record |
|---|---|---|---|---|---|---|
| Serco Inc | Department of DefenseDepartment of the Navy | ContractDelivery Order | $101M | 21 Nov 2025 | CA | USAspending |
| General Dynamics Mission Systems, Inc. | Department of DefenseDepartment of the Navy | ContractDefinitive Contract | $92M | 11 Jan 2024 | MA | USAspending |
| Serco Inc | Department of DefenseDepartment of the Navy | ContractDelivery Order | $81M | 1 Dec 2023 | VA | USAspending |
| First Coast Security Solutions, Inc. | Department of Homeland SecurityOffice of Procurement Operations | ContractDelivery Order | $59M | 30 Sep 2025 | CA | USAspending |
| CACI International Inc | Department of DefenseDepartment of the Air Force | ContractDelivery Order | $47M | 16 Dec 2022 | VA | USAspending |
| Xator LLC | Department of DefenseDepartment of the Air Force | ContractDelivery Order | $47M | 6 Jan 2023 | VA | USAspending |
| Serco Inc | Department of DefenseDepartment of the Navy | ContractDelivery Order | $47M | 29 Apr 2025 | CA | USAspending |
| Serco Inc | Department of DefenseDepartment of the Navy | ContractDelivery Order | $44M | 30 Nov 2024 | VA | USAspending |
| M. C. Dean, Inc. | Department of DefenseDepartment of the Air Force | ContractDelivery Order | $42M | 2 Feb 2023 | VA | USAspending |
| Johnson Controls Building Automation Systems, LLC | Department of DefenseDepartment of the Air Force | ContractDelivery Order | $40M | 3 Feb 2023 | MD | USAspending |
Other industries in sector 56: Administrative, support, waste management and remediation services
- 561210 Facilities Support Services $152B
- 562910 Remediation Services $28B
- 561612 Security Guards and Patrol Services $25B
- 562211 Hazardous Waste Treatment and Disposal $8.8B
- 561720 Janitorial Services $8.0B
- 561990 All Other Support Services $7.4B
- 562119 Other Waste Collection $4.6B
- 561320 Temporary Help Services $4.0B
- 561422 Telemarketing Bureaus and Other Contact Centers $3.4B
- 561611 Investigation and Personal Background Check Services $3.2B
- 561110 Office Administrative Services $2.8B
- 561599 All Other Travel Arrangement and Reservation Services $2.7B
- 561730 Landscaping Services $2.3B
- 561499 All Other Business Support Services $2.1B
- 562111 Solid Waste Collection $1.2B
- 561421 Telephone Answering Services $722M
- 561450 Credit Bureaus $714M
- 561920 Convention and Trade Show Organizers $592M
- 561440 Collection Agencies $491M
- 562998 All Other Miscellaneous Waste Management Services $411M
- 562991 Septic Tank and Related Services $376M
- 562112 Hazardous Waste Collection $284M
- 561410 Document Preparation Services $268M
- 561790 Other Services to Buildings and Dwellings $256M
Questions and answers
How much does the federal government spend on NAICS 561621?
$675M in contract obligations classified under Security Systems Services (except Locksmiths) in FY2026, $3.0B over the five fiscal years since FY2023. Obligations are commitments, not payments.
Who are the top contractors in Security Systems Services (except Locksmiths)?
M. C. Dean, Inc. ($395M), Serco Inc ($316M), Paragon Systems Inc ($177M), Johnson Controls Security Solutions LLC ($133M), Advanced Technology Systems Company, Inc. (of Virginia) ($125M), by contract obligations over FY2022–FY2025.
Which agencies buy in this industry?
By the value of $1.0M-plus contracts since FY2023: Department of Defense ($920M), Department of Homeland Security ($359M), Department of Justice ($167M), Department of Transportation ($81M), Department of Veterans Affairs ($58M).
What is a NAICS code?
In USAspending's words: "NAICS stands for the North American Industrial Classification System. This 6-digit code tells you what industry the work falls into. Each contract record has a NAICS code." Assistance awards (grants, loans, direct payments) carry no NAICS code and are not counted here.
Provenance
Source: USAspending.gov API v2, spending by category (NAICS) by fiscal year, recipient cross-tabulation for FY2022–FY2025 and award search, loaded 30 Sep 2026. State figures come from each state's top-100 NAICS list, so small amounts in a state may be missing. See methodology.