Top DOT security systems services (except locksmiths) contractors
In the 12 months ending Oct 5, 2026, the Department of Transportation obligated $52.3M in net prime contract dollars under NAICS 561621, up 40.9% from $37.1M in the preceding 12 months. 22 prime contractors received positive obligations, and 1 of them accounted for 80% of that spend.
Prime contracts funded by the Department of Transportation. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top DOT 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 | M. C. Dean, Inc. | $48.9M | $25.5M | 92.9% | — |
| 2 | KBR Wyle Services, LLC | $2.9M | $8.9M | 5.4% | — |
| 3 | S & K Security Group LLC | $329K | $0 | 0.6% | New |
| 4 | Johnson Controls Fire Protection LP | $85K | $69K | 0.2% | ▲ 4 |
| 5 | Koorsen Fire & Security Inc | $65K | $97K | 0.1% | — |
| 6 | Concentric Security LLC | $55K | $88K | 0.1% | — |
| 7 | Signet Technologies, Inc. | $55K | $19K | 0.1% | ▲ 12 |
| 8 | Hidenis Group LLC | $53K | $40K | 0.1% | ▲ 4 |
| 9 | Hurtvet Subcontracting, Inc. | $36K | $0 | 0.1% | New |
| 10 | Siemens Industry Inc | $32K | $32K | 0.1% | ▲ 3 |
| 11 | Onsolve LLC | $20K | $20K | 0.0% | ▲ 6 |
| 12 | 0369 Security Solutions Services LLC | $20K | $0 | 0.0% | New |
| 13 | Wycliffe Enterprises, Inc. | $19K | $0 | 0.0% | New |
| 14 | j2 Associates, LLC | $19K | $1.2M | 0.0% | ▼ 11 |
| 15 | Alarm Control Systems Inc | $16K | $87K | 0.0% | ▼ 8 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- M. C. Dean, Inc.$25.5M → $48.9M (+$23.3M) · now #1
- S & K Security Group LLC$0 → $329K (+$329K) · now #3
- Hurtvet Subcontracting, Inc.$0 → $36K (+$36K) · now #9
Largest declines
- KBR Wyle Services, LLC$8.9M → $2.9M (−$6.0M) · now #2
- j2 Associates, LLC$1.2M → $19K (−$1.2M) · now #14
- Versar Security Systems, LLC$710K → −$213K (−$923K) · no latest-period obligations
New to this market
3 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| S & K Security Group LLC | Nov 17, 2025 | $329K |
| 0369 Security Solutions Services LLC | Mar 27, 2026 | $20K |
| Wycliffe Enterprises, Inc. | Jun 5, 2026 | $19K |
Where the money comes from
Funding sub-agencies within the Department of Transportation, 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 |
|---|---|---|---|
| Federal Aviation Administration | $52.2M | $35.7M | Up $16.4M (45.9%) |
| Saint Lawrence Seaway Development Corporation | $53K | $40K | Up $13K (32.5%) |
| Immediate Office of the Secretary of Transportation | $48K | $1.3M | Down $1.3M (96.4%) |
| Federal Highway Administration | $34K | $18K | Up $16K (90.9%) |
| Maritime Administration | $20K | $20K | Up $0 (0.0%) |
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 |
|---|---|---|---|
| 693KA823F00129 | M. C. Dean, Inc. MIKE MONRONEY AERONAUTICAL CENTER (MMAC) PHASE 1.1 (SITE SURVEY/DESIGN) | $4.4M | Dec 31, 2026 |
| 693KA825F00123 | M. C. Dean, Inc. BALTIMORE WASHINGTON INTERNATIONAL ATCT (BWI) - PHASE 2A/2B (PROCUREMENT AND PRE-INSTALLATION / IMPLEMENTATION) | $1.8M | Jan 29, 2027 |
| 693KA826C00003 | M. C. Dean, Inc. SECURITY SYSTEM MAINTENANCE CONTRACT - INCREMENTALLY FUNDED | $6.4M | Mar 8, 2027 |
| 693KA825F00113 | M. C. Dean, Inc. BOSTON CONSOLIDATED TRACON (A90) PHASE 2A (PROCUREMENT AND PRE INSTALLATION) AND BOSTON CONSOLIDATED TRACON (A90) PHASE 2B (IMPLEMENTATION) | $2.3M | May 22, 2027 |
| 693KA825F00249 | M. C. Dean, Inc. PSEMS POAM REMEDIATION AND MIGRATION | $5.9M | Jul 5, 2027 |
| 693KA820F00051 | M. C. Dean, Inc. PHYSICAL SECURITY ENTERPRISE MANAGEMENT SYSTEM (PSEMS) PHASES 1 AND 2 | $4.5M | Aug 14, 2027 |
| 693KA826F00315 | M. C. Dean, Inc. LEGACY PSEMS SYSTEM SOFTWARE LICENSING (WP 2026-WA-005) | $3.1M | Aug 14, 2027 |
| 693KA824F00060 | M. C. Dean, Inc. MIKE MONRONEY AERONAUTICAL CENTER (MMAC) PHASE 1.2 (SITE SURVEY/DESIGN) | $4.6M | Dec 31, 2027 |
| 693KA823F00306 | M. C. Dean, Inc. MIRAMAR FSDO PHASE 1 - SECURITY SYSTEMS DESIGN AND INTEGRATION II CONTRACT # 693KA8-19-D-00007 | $1.7M | Dec 31, 2027 |
| 693KA822F00177 | M. C. Dean, Inc. ASHEVILLE ATCT PHASE 1 (SITE SURVEY/DESIGN) | $1.5M | Dec 31, 2027 |
Common questions
Who are the top DOT contractors for NAICS 561621?
In the latest 12 months, M. C. Dean, Inc. ($48.9M), KBR Wyle Services, LLC ($2.9M), S & K Security Group LLC ($329K) received the most DOT obligations for security systems services (except locksmiths).
How concentrated is this market?
The eight largest primes held 99.6% of positive obligations, and M. C. Dean, Inc. alone held 92.9%. 3 contractors won their first obligations in this market during the latest 12 months.
Are any large DOT 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 693KA823F00129 (M. C. Dean, Inc., $4.4M obligated), ending Dec 31, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
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$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.
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