Top DoD security systems services (except locksmiths) contractors
In the 12 months ending Oct 5, 2026, the Department of Defense obligated $317.8M in net prime contract dollars under NAICS 561621, down 28.0% from $441.6M in the preceding 12 months. 249 prime contractors received positive obligations, and 15 of them accounted for 80% of that spend.
Prime contracts funded by the Department of Defense. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
DoD publishes contract data to USAspending with a 90-day delay, so the most recent months understate DoD activity.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top DoD contractors for NAICS 561621
Ranked by positive obligations in the latest 12 months. Share is of all positive obligations in this market.
| # | Contractor | Latest 12 mo | Prior 12 mo | Share | Rank change |
|---|---|---|---|---|---|
| 1 | Serco Inc | $101.2M | $103.6M | 31.7% | — |
| 2 | M. C. Dean, Inc. | $34.8M | $64.0M | 10.9% | — |
| 3 | CACI International Inc | $33.5M | $35.5M | 10.5% | ▲ 1 |
| 4 | Johnson Controls Building Automation Systems, LLC | $22.0M | $18.4M | 6.9% | ▲ 2 |
| 5 | Xator LLC | $14.0M | $20.1M | 4.4% | — |
| 6 | General Dynamics Mission Systems, Inc. | $11.7M | $44.6M | 3.7% | ▼ 3 |
| 7 | Akamai Intelligence LLC | $6.4M | $0 | 2.0% | New |
| 8 | Media Plumbing & Heating Inc | $6.1M | $8.6M | 1.9% | ▼ 1 |
| 9 | Advanced Technology Systems Company, Inc. (of Virginia) | $5.9M | $0 | 1.8% | New |
| 10 | itm4g LLC | $5.3M | $4.0M | 1.7% | ▲ 2 |
| 11 | Trofholz Technologies, Inc. | $3.7M | $3.0M | 1.2% | ▲ 6 |
| 12 | HQE Systems, Inc. | $3.6M | $1.8M | 1.1% | ▲ 17 |
| 13 | Total-Evergreen JV LLC | $3.4M | $3.0M | 1.1% | ▲ 5 |
| 14 | Integrated Security Technologies Inc. | $3.2M | $1.6M | 1.0% | ▲ 21 |
| 15 | Evergreen Fire Alarms LLC | $3.1M | $6.6M | 1.0% | ▼ 6 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- Akamai Intelligence LLC$0 → $6.4M (+$6.4M) · now #7
- Advanced Technology Systems Company, Inc. (of Virginia)$0 → $5.9M (+$5.9M) · now #9
- Johnson Controls Building Automation Systems, LLC$18.4M → $22.0M (+$3.6M) · now #4
Largest declines
- General Dynamics Mission Systems, Inc.$44.6M → $11.7M (−$32.9M) · now #6
- M. C. Dean, Inc.$64.0M → $34.8M (−$29.2M) · now #2
- Indyne, Inc$6.7M → −$270K (−$7.0M) · no latest-period obligations
New to this market
41 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Akamai Intelligence LLC | May 11, 2026 | $6.4M |
| Falken Industries LLC | Oct 10, 2025 | $1.9M |
| alaka`i Services Group Inc. | Jun 30, 2026 | $1.2M |
| agile1tech Corporation | Dec 23, 2025 | $846K |
| Livion Technology, LLC | Jan 13, 2026 | $378K |
| Singhal & Co Inc | Jun 18, 2026 | $321K |
| Perimeter Security Group, LLC | Mar 10, 2026 | $216K |
| Access Control Group, Inc. | May 8, 2026 | $150K |
Where the money comes from
Funding sub-agencies within the Department of Defense, latest 12 months. The funding organization can differ from the office that runs the requirement.
| Funding sub-agency | Latest 12 mo | Prior 12 mo | Change |
|---|---|---|---|
| Department of the Navy | $142.7M | $178.6M | Down $35.9M (20.1%) |
| Department of the Air Force | $89.1M | $131.0M | Down $42.0M (32.0%) |
| Department of the Army | $36.8M | $53.4M | Down $16.6M (31.1%) |
| Pentagon Force Protection Agency | $22.4M | $47.4M | Down $25.0M (52.7%) |
| Defense Logistics Agency | $6.8M | $6.5M | Up $343K (5.3%) |
| Defense Counterintelligence and Security Agency | $6.4M | −$6K | Up $6.4M (111958.7%) |
Potential recompetes
Large awards in this market whose current period of performance ends in the next 18 months. Treat these as research leads: options, extensions, and follow-on vehicles often change the timing.
| Award | Incumbent | Obligated | Current end |
|---|---|---|---|
| W81K0421C0005 | Vista Defense Technologies, LLC PROVIDE SERVICES FOR SECURITY MAINTENANCE SERVICES AT BROOKE ARMY MEDICAL CENTER, JBSA-FT HOOD, TX. | $15.6M | Nov 30, 2026 |
| N3943026F0002 | Serco Inc THE PURPOSE OF THIS TASK ORDER IS TO AWARD THE ANNUAL SUSTAINMENT OF PUBLIC SAFETY SYSTEMS (PSS) FOR FY26 TO CNIC LOCATIONS WORLDWIDE. | $101.2M | Dec 1, 2026 |
| HQ003422F0031 | M. C. Dean, Inc. FORCE PROTECTION TECHNOLOGY SUPPORT SERVICES | $46.0M | Dec 16, 2026 |
| HQ003422F0029 | M. C. Dean, Inc. INTEGRATED SECURITY SERVICES CONTRACT (ISSC4) TO PROVIDE A TOTAL SYSTEM APPROACH FOR INTEGRATED ELECTRONIC AND PHYSICAL SECURITY SYSTEMS. | $41.2M | Dec 16, 2026 |
| FA873021F0046 | BCF Solutions, Inc. GLOBAL AIRCREW STRATEGIC NETWORK TERMINALS FULL OPERATIONAL CAPABILITY INTRUSION DETECTION SECURITY SYSTEM DESIGN AND INSTALL | $16.8M | Dec 31, 2026 |
| N0003024C1001 | General Dynamics Mission Systems, Inc. FY24 PM, SYS ENG, & BUSINESS MGMT | $92.1M | Jan 14, 2027 |
| FA873023F0008 | Johnson Controls Building Automation Systems, LLC INTEGRATED BASE DEFENSE SECURITY SYSTEM (IBDSS) NEXT - CENTRAL REGION | $39.6M | Feb 9, 2027 |
| FA873022F0032 | Xator LLC QATAR F-15QA PERMANENT FACILITIES INTRUSION DETECTION SYSTEM INSTALLATION, SECURE STORAGE INVENTORY MANAGERS AND CONTRACTOR LOGISTICS SUPPORT | $9.9M | May 29, 2027 |
| FA873022C0017 | Advanced Technology Systems Company, Inc. (of Virginia) EGYPTIAN ARMAMENT AUTHORITY (EAA) MOBILE SURVEILLANCE SENSOR SECURITY (MS3) SYSTEM PHASE II | $115.9M | Dec 31, 2027 |
| FA873023F0006 | M. C. Dean, Inc. INTEGRATED BASE DEFENSE SECURITY SYSTEM (IBDSS) NEXT - WESTERN REGION | $41.7M | Feb 1, 2028 |
Common questions
Who are the top DoD contractors for NAICS 561621?
In the latest 12 months, Serco Inc ($101.2M), M. C. Dean, Inc. ($34.8M), CACI International Inc ($33.5M) received the most DoD obligations for security systems services (except locksmiths).
How concentrated is this market?
The eight largest primes held 71.8% of positive obligations, and Serco Inc alone held 31.7%. 41 contractors won their first obligations in this market during the latest 12 months.
Are any large DoD NAICS 561621 contracts ending soon?
10 of the largest awards in this market reach their current end date in the next 18 months. The first is W81K0421C0005 (Vista Defense Technologies, LLC, $15.6M obligated), ending Nov 30, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
Related markets
NAICS 561621 across all agencies
DHS · NAICS 561621
$134.4MDOT · NAICS 561621
$52.3MVA · NAICS 561621
$51.5MDOJ · NAICS 561621
$20.7MHHS · NAICS 561621
$9.3MDOE · NAICS 561621
$9.3MTreasury · NAICS 561621
$8.4MInterior · NAICS 561621
$7.3MFigures are net obligations on prime contracts (award types A–D) from USAspending.gov, grouped by funding agency and the NAICS code on each award. Net obligations include deobligations and corrections, so they can differ from positive-obligation totals. See methodology.
Ready to connect your pursuit work?
GovEagle gives BD directors, capture managers, and proposal teams one AI workspace from pipeline through proposal, with CMMC/FedRAMP Certified compliance built in.