Top 100 Contractors in NAICS 561: Administrative and Support Services, Aug 2025–Jul 2026
Parent companies by net contract obligations Aug 1, 2025 – Jul 31, 2026 Code page on GovTribe
The latest 12 months. See the newest fiscal year's list: Top Contractors in NAICS 561: Administrative and Support Services, FY2025.
The top 10 won 49% of NAICS 561 contract dollars from August 2025 through July 2026
Ranking facts
- Contract obligations
- $57,071,715,172 Net of deobligations, by contracts coded NAICS 561 or a code under it
- Contractors
- 7,466 Parent companies with an obligation
- Largest contractor
- Honeywell International Inc. $6.15 billion, 10.1% of obligations
- Data as of
Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)
Full ranking
| Rank | Contractor | Net obligations | Share | Trend |
|---|---|---|---|---|
| 1 | $6,148,924,429 | |||
| 2 | $5,465,603,599 | |||
| 3 | $3,316,974,337 | |||
| 4 |
Ut-Battelle LLC
Top agencies
|
$3,109,333,272 | ||
| 5 | $3,084,909,240 | |||
| 6 | $1,955,707,987 | |||
| 7 |
V2X, Inc.
|
$1,903,681,969 | ||
| 8 | $1,692,676,352 | |||
| 9 |
Grimes Aerospace Company
|
$1,512,277,915 | ||
| 10 |
CSI Aviation, Inc.
Top agencies
|
$1,427,302,579 | ||
| 11 | $1,073,964,611 | |||
| 12 | $971,289,153 | |||
| 13 |
KBR Wyle Services LLC
|
$944,406,273 | ||
| 14 | $812,884,499 | |||
| 15 | $718,535,944 | |||
| 16 | $617,965,219 | |||
| 17 | $523,653,985 | |||
| 18 | $500,601,411 | |||
| 19 | $483,663,205 | |||
| 20 |
Securitas Critical Infrastructure Services Inc.
|
$470,336,135 | ||
| 21 | $459,547,514 | |||
| 22 | $429,583,559 | |||
| 23 | $425,311,764 | |||
| 24 |
Fedex Corp
Top agencies
|
$405,786,021 | ||
| 25 | $363,601,478 | |||
| 26 | $346,927,006 | |||
| 27 | $334,902,821 | |||
| 28 | $284,893,482 | |||
| 29 | $281,718,801 | |||
| 30 | $274,869,300 | |||
| 31 | $242,687,570 | |||
| 32 | $242,136,615 | |||
| 33 | $236,215,254 | |||
| 34 |
Inter-CON Security Systems Inc.
|
$218,963,095 | ||
| 35 | $215,345,602 | |||
| 36 | $183,690,077 | |||
| 37 |
Peckham Vocational Industries Inc.
Top agencies
|
$182,900,038 | ||
| 38 | $156,041,007 | |||
| 39 | $152,408,543 | |||
| 40 |
BC Partners LLP
|
$148,568,098 | ||
| 41 |
Akima Facilities Operations LLC
|
$140,793,063 | ||
| 42 | $140,777,110 | |||
| 43 |
Kerberos International Inc.
|
$138,477,454 | ||
| 44 | $128,006,396 | |||
| 45 | $114,692,825 | |||
| 46 |
J & J Maintenance Inc.
|
$114,417,375 | ||
| 47 | $111,354,196 | |||
| 48 | $111,310,658 | |||
| 49 | $108,476,974 | |||
| 50 |
Pegasus Support Services LLC
|
$108,002,344 | ||
| 51 | $107,535,632 | |||
| 52 |
Serco Inc
|
$104,105,728 | ||
| 53 |
Mvm, Inc.
Top agencies
|
$102,688,721 | ||
| 54 | $100,549,234 | |||
| 55 | $100,319,918 | |||
| 56 | $100,226,306 | |||
| 57 |
Emcor Group Inc.
|
$97,940,406 | ||
| 58 | $96,629,759 | |||
| 59 | $86,031,416 | |||
| 60 | $85,818,643 | |||
| 61 |
Vendtech-Sgi LLC
Top agencies
|
$82,163,813 | ||
| 62 |
AED Stratecon LLC
Top agencies
|
$81,685,728 | ||
| 63 | $80,914,744 | |||
| 64 | $78,953,046 | |||
| 65 | $78,598,087 | |||
| 66 | $76,892,356 | |||
| 67 | $76,792,257 | |||
| 68 | $76,017,857 | |||
| 69 | $75,783,314 | |||
| 70 |
CDA Incorporated
Top agencies
|
$73,053,690 | ||
| 71 |
Koa Lani JV LLC
Top agencies
|
$72,864,556 | ||
| 72 | $72,218,856 | |||
| 73 | $72,004,116 | |||
| 74 | $70,570,381 | |||
| 75 |
Titan-Auxo, LLC
Top agencies
|
$70,331,124 | ||
| 76 | $69,459,159 | |||
| 77 |
American Eagle Protective Services Corp
|
$69,213,615 | ||
| 78 |
Performant Financial Corporation
Top agencies
|
$69,200,000 | ||
| 79 | $68,570,096 | |||
| 80 | $67,538,257 | |||
| 81 |
Vanquish Worldwide L.L.C.
Top agencies
|
$65,049,987 | ||
| 82 | $65,049,793 | |||
| 83 |
Tiya Services L.L.C.
Top agencies
|
$64,701,199 | ||
| 84 | $63,668,615 | |||
| 85 | $63,147,615 | |||
| 86 | $62,741,146 | |||
| 87 | $62,551,320 | |||
| 88 | $62,468,669 | |||
| 89 | $62,253,884 | |||
| 90 |
Continental Service Group Inc
|
$61,620,303 | ||
| 91 | $61,186,457 | |||
| 92 | $60,913,909 | |||
| 93 |
Trace Systems, Inc.
Top agencies
|
$59,658,160 | ||
| 94 | $59,301,319 | |||
| 95 | $58,502,223 | |||
| 96 | $58,433,717 | |||
| 97 |
Atkins Nuclear Secured Holdings Corporation
Top agencies
|
$57,514,681 | ||
| 98 | $57,473,229 | |||
| 99 |
VMD Systems Integrators LLC
Top agencies
|
$54,383,728 | ||
| 100 | $53,793,172 |
Show 75 more
100 of 7,466 contractors listed here. See the rest on GovTribe.
Rankings for the codes under NAICS 561
| Code | Net obligations | Largest contractor |
|---|---|---|
| 5612 Facilities Support Services | $39,604,686,675 | Honeywell International Inc. |
| 5616 Investigation and Security Services | $8,692,879,995 | The GEO Group, Inc. |
| 5617 Services to Buildings and Dwellings | $2,541,380,307 | AED Stratecon LLC |
| 5614 Business Support Services | $2,157,636,996 | Maximus Federal Services, Inc. |
| 5615 Travel Arrangement and Reservation Services | $1,334,618,841 | CSI Aviation, Inc. |
| 5619 Other Support Services | $1,317,233,145 | Lockheed Martin Corporation |
| 5613 Employment Services | $874,687,568 | Titan-Auxo, LLC |
| 5611 Office Administrative Services | $548,591,646 | Trace Systems, Inc. |
How this ranking works
- Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
- Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $60.6 billion obligated before deobligations, so they never pass 100%.
- Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
- Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
- Rank changes compare with Aug 2024–Jul 2025. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
- Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list.
- Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.
Quick answers
Who were the top 10 NAICS 561 contractors in Aug 2025–Jul 2026?
1. Honeywell International Inc. ($6.15B), 2. Triad National Security LLC ($5.47B), 3. Fluor Corporation ($3.32B), 4. Ut-Battelle LLC ($3.11B), 5. Consolidated Nuclear Security, LLC ($3.08B), 6. Amentum Holdings, Inc. ($1.96B), 7. V2X, Inc. ($1.9B), 8. Pantexas Deterrence, LLC ($1.69B), 9. Grimes Aerospace Company ($1.51B), 10. CSI Aviation, Inc. ($1.43B).
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