Least concentrated federal markets
Federal NAICS markets ranked by how little of the money the five largest vendors hold, least concentrated first. In these markets no single incumbent dominates: the work is spread across many firms, and the top five hold only a small share of the dollars. The $/firm column shows the money divided by the number of competing firms, a rough sense of how much is on the table per player.
Read this as structure, not as a scorecard. A low top-5 share means the dollars are fragmented, which can mean a new entrant is able to take a slice. It does not by itself mean the market is easy to enter: barriers like clearances, past-performance requirements, and vehicle access are not visible in obligation data.
In the least concentrated market here, Support Activities For Forestry, the five largest vendors hold just 9% of $1.0B, spread across 2,236 firms; even the largest, GRAYBACK FORESTRY, INC., holds only 2%. Markets like these reward a broad competitive field over an entrenched incumbent.
Federal prime-contract obligations (FPDS), trailing 12 months, refreshed daily. Figures as of 2026-08-24.
| # | NAICS market | Obligated | Top-5 share |
|---|---|---|---|
| 1 |
115310 Support Activities For Forestry
Largest of 2,236: GRAYBACK FORESTRY, INC. (2%)
|
$1.0B | 9% |
| 2 |
623110 Nursing Care Facilities (Skilled Nursing Facilities)
Largest of 620: CRESTWOOD BEHAVIORAL HEALTH, INC (2%)
|
$330.4M | 10% |
| 3 |
238220 Plumbing, Heating, And Air-Conditioning Contractors
Largest of 1,897: JETT'S SPECIALTY CONTRACTING, LLC (2%)
|
$1.1B | 10% |
| 4 |
561720 Janitorial Services
Largest of 1,593: FEDCAP REHABILITATION SERVICES, INC (4%)
|
$1.5B | 16% |
| 5 |
562991 Septic Tank And Related Services
Largest of 627: MAJOR CONTRACTING SERVICES, INC. (4%)
|
$74.9M | 17% |
| 6 |
541611 Administrative Management And General Management Consulting Services
Largest of 2,557: DELOITTE CONSULTING LLP (7%)
|
$10.0B | 20% |
| 7 |
541519 Other Computer Related Services
Largest of 2,997: THUNDERCAT TECHNOLOGY, LLC (5%)
|
$22.8B | 20% |
| 8 |
562111 Solid Waste Collection
Largest of 840: HAMILTON ALLIANCE INC (6%)
|
$275.4M | 20% |
| 9 |
811310 Commercial And Industrial Machinery And Equipment (Except Automotive And Electronic) Repair And Maintenance
Largest of 2,329: KBR SERVICES, LLC (7%)
|
$560.1M | 22% |
| 10 |
332996 Fabricated Pipe And Pipe Fitting Manufacturing
Largest of 773: JA MOODY LLC (10%)
|
$75.4M | 22% |
| 11 |
332919 Other Metal Valve And Pipe Fitting Manufacturing
Largest of 784: SARGENT AEROSPACE & DEFENSE, LLC (7%)
|
$149.7M | 22% |
| 12 |
335931 Current-Carrying Wiring Device Manufacturing
Largest of 936: ACE ELECTRONICS DEFENSE SYSTEMS, LLC (9%)
|
$129.9M | 22% |
| 13 |
621910 Ambulance Services
Largest of 304: EXCELSIOR AMBULANCE SERVICE INC (9%)
|
$339.2M | 22% |
| 14 |
326220 Rubber And Plastics Hoses And Belting Manufacturing
Largest of 471: KAMPI COMPONENTS CO INC (6%)
|
$27.4M | 22% |
| 15 |
332510 Hardware Manufacturing
Largest of 1,963: OSHKOSH DEFENSE LLC (7%)
|
$401.1M | 23% |
| 16 |
541310 Architectural Services
Largest of 574: AECOM TECHNICAL SERVICES, INC. (8%)
|
$616.3M | 23% |
| 17 |
238160 Roofing Contractors
Largest of 408: SENECA FEDERAL SOLUTIONS, LLC (7%)
|
$424.4M | 23% |
| 18 |
561730 Landscaping Services
Largest of 1,401: AED STRATECON LLC (16%)
|
$608.3M | 23% |
| 19 |
334514 Totalizing Fluid Meter And Counting Device Manufacturing
Largest of 351: STANDARD CALIBRATIONS INC (8%)
|
$33.7M | 24% |
| 20 |
326122 Plastics Pipe And Pipe Fitting Manufacturing
Largest of 386: CONTAINMENT CORPORATION (7%)
|
$23.7M | 24% |
| 21 |
336390 Other Motor Vehicle Parts Manufacturing
Largest of 639: TECMOTIV (USA), INC. (7%)
|
$137.4M | 24% |
| 22 |
621399 Offices Of All Other Miscellaneous Health Practitioners
Largest of 191: GIACARE & MEDTRUST JV LLC (7%)
|
$127.1M | 25% |
| 23 |
541715 Research And Development In The Physical, Engineering, And Life Sciences (Except Nanotechnology And Biotechnology)
Largest of 5,849: FLUOR MARINE PROPULSION, LLC (10%)
|
$39.1B | 25% |
| 24 |
221122 Electric Power Distribution
Largest of 352: CONSTELLATION NEWENERGY, INC. (6%)
|
$1.1B | 25% |
| 25 |
541330 Engineering Services
Largest of 3,709: ELECTRIC BOAT CORPORATION (16%)
|
$44.6B | 26% |
| 26 |
339991 Gasket, Packing, And Sealing Device Manufacturing
Largest of 945: PIONEER INDUSTRIES, LLC (15%)
|
$105.7M | 26% |
| 27 |
541620 Environmental Consulting Services
Largest of 968: VERNADERO GROUP INC (7%)
|
$1.1B | 26% |
| 28 |
541511 Custom Computer Programming Services
Largest of 1,953: PALANTIR USG INC (9%)
|
$10.5B | 27% |
| 29 |
332911 Industrial Valve Manufacturing
Largest of 721: LESLIE CONTROLS, INC. (12%)
|
$284.1M | 27% |
| 30 |
561110 Office Administrative Services
Largest of 430: AGILE DECISION SCIENCES, LLC (8%)
|
$424.6M | 27% |
Before you chase one, see who is already in it.
A market's profile lists the firms currently winning and the agencies buying: GET /api/v1/naics/{code}. Get verified teaming and business-development contacts from the same federal data.
How these numbers are computed
Each row aggregates the public FPDS prime-contract record for one NAICS code, over the trailing 12 months. Only markets with sustained spending and a real field of competitors are ranked, so a code with two firms and one award never shows up as artificially open. Top-5 share is the five largest recipients' portion of awarded dollars; $/firm is net obligations divided by the count of distinct winning firms.
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