Top 100 Contractors in PSC F: Natural Resources Management, 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 PSC F: Natural Resources Management, FY2025.
The top 10 won 30% of PSC F contract dollars from August 2025 through July 2026
Ranking facts
- Contract obligations
- $8,041,489,327 Net of deobligations, by contracts coded PSC F or a code under it
- Contractors
- 4,578 Parent companies with an obligation
- Largest contractor
- Amentum Holdings, Inc. $1.48 billion, 16.5% 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 | $1,483,040,605 | |||
| 2 | $143,819,066 | |||
| 3 |
BWX Technologies, Inc.
Top agencies
|
$141,424,634 | ||
| 4 |
Helicopter Express LLC
Top agencies
|
$139,584,881 | ||
| 5 | $134,173,854 | |||
| 6 |
L3Harris Technologies, Inc.
Top agencies
|
$130,800,000 | ||
| 7 | $129,959,073 | |||
| 8 | $122,330,141 | |||
| 9 |
Guidehouse Inc.
|
$121,036,767 | ||
| 10 | $119,599,732 | |||
| 11 |
Bechtel Corp
Top agencies
|
$118,193,551 | ||
| 12 | $117,735,740 | |||
| 13 | $113,574,799 | |||
| 14 | $107,422,566 | |||
| 15 |
EA Engineering Science and Technology Inc. PBC
|
$94,739,491 | ||
| 16 | $93,968,749 | |||
| 17 | $89,182,112 | |||
| 18 |
Kemron Environmental Services Inc.
|
$87,226,223 | ||
| 19 | $82,453,727 | |||
| 20 |
Aero-Flite, Inc.
Top agencies
|
$67,940,365 | ||
| 21 | $61,852,321 | |||
| 22 | $61,293,470 | |||
| 23 | $57,165,830 | |||
| 24 |
Aero Air, LLC
Top agencies
|
$56,011,943 | ||
| 25 |
Ducks Unlimited, Inc.
Top agencies
|
$56,000,000 | ||
| 26 | $54,209,403 | |||
| 27 | $52,695,529 | |||
| 28 | $51,043,501 | |||
| 29 |
Weston Solutions Holdings Inc
|
$47,765,912 | ||
| 30 | $45,459,151 | |||
| 31 | $40,724,002 | |||
| 32 | $40,495,633 | |||
| 33 | $37,727,548 | |||
| 34 |
Tenax Aerospace LLC
Top agencies
|
$35,128,288 | ||
| 35 | $34,283,868 | |||
| 36 | $34,268,056 | |||
| 37 |
Rotak LLC
Top agencies
|
$33,146,457 | ||
| 38 |
Gulf South Research Corp
|
$32,493,095 | ||
| 39 | $32,169,161 | |||
| 40 | $32,122,156 | |||
| 41 |
10 Tanker Air Carrier LLC
Top agencies
|
$31,916,928 | ||
| 42 | $28,353,796 | |||
| 43 |
Grayback Forestry Inc.
|
$28,153,138 | ||
| 44 | $27,768,129 | |||
| 45 | $27,728,274 | |||
| 46 | $27,701,716 | |||
| 47 | $26,232,493 | |||
| 48 | $26,070,277 | |||
| 49 | $25,991,966 | |||
| 50 | $25,686,407 | |||
| 51 |
Gsia-Parsons JV LLC
Top agencies
|
$25,463,633 | ||
| 52 | $25,249,405 | |||
| 53 | $25,051,162 | |||
| 54 | $24,265,761 | |||
| 55 |
Hgl-Aptim JV LLC
Top agencies
|
$24,044,997 | ||
| 56 |
Kfs, LLC
Top agencies
|
$23,400,000 | ||
| 57 |
Orbic Air, LLC
Top agencies
|
$22,497,790 | ||
| 58 | $21,948,843 | |||
| 59 |
Croman Corp
Top agencies
|
$21,350,555 | ||
| 60 |
Heli-1 Corp
Top agencies
|
$20,334,361 | ||
| 61 | $19,598,986 | |||
| 62 |
Houston's Too LC
Top agencies
|
$19,306,064 | ||
| 63 | $18,984,309 | |||
| 64 |
Jacobs Engineering Group Inc.
|
$18,825,322 | ||
| 65 | $18,509,384 | |||
| 66 |
Ahtna-Arcadis 8(A) JV, LLC
Top agencies
|
$18,147,756 | ||
| 67 | $17,957,146 | |||
| 68 | $17,791,228 | |||
| 69 |
Trans Aero LLC
Top agencies
|
$17,593,041 | ||
| 70 |
Aero Spray Inc.
Top agencies
|
$17,189,267 | ||
| 71 | $17,163,787 | |||
| 72 |
Brink Brothers Inc.
Top agencies
|
$16,778,560 | ||
| 73 | $16,678,001 | |||
| 74 | $16,656,703 | |||
| 75 | $16,413,980 | |||
| 76 | $16,307,417 | |||
| 77 |
Precision, LLC
Top agencies
|
$16,299,027 | ||
| 78 |
C M C, Inc.
Top agencies
|
$15,674,519 | ||
| 79 |
Catawba Teapec LLC
Top agencies
|
$15,589,977 | ||
| 80 | $14,727,429 | |||
| 81 | $14,317,370 | |||
| 82 |
Pacific OASIS Inc
Top agencies
|
$14,113,141 | ||
| 83 | $14,070,144 | |||
| 84 | $14,069,140 | |||
| 85 | $14,036,927 | |||
| 86 | $13,774,070 | |||
| 87 |
Bluesky Helicopters Inc.
Top agencies
|
$13,382,593 | ||
| 88 | $13,306,379 | |||
| 89 | $13,293,003 | |||
| 90 |
The Source Group, Inc.
Top agencies
|
$13,288,766 | ||
| 91 | $13,252,775 | |||
| 92 | $13,212,648 | |||
| 93 | $13,195,898 | |||
| 94 | $13,166,973 | |||
| 95 |
Clean Harbors Inc.
|
$13,117,519 | ||
| 96 |
Fidelis-Bbd, LLC
Top agencies
|
$12,956,387 | ||
| 97 |
GFP Enterprises, LLC
Top agencies
|
$12,883,937 | ||
| 98 |
Fletcher Flying Service Inc
Top agencies
|
$12,830,273 | ||
| 99 | $12,808,176 | |||
| 100 | $12,510,751 |
Show 75 more
100 of 4,578 contractors listed here. See the rest on GovTribe.
Rankings for the codes under PSC F
| Code | Net obligations | Largest contractor |
|---|---|---|
| F9 Natural Resources – Other Services | $2,946,145,933 | Amentum Holdings, Inc. |
| F0 Natural Resource Conservation Services | $2,822,650,922 | Helicopter Express LLC |
| F1 Environmental Systems Protection | $2,272,692,472 | Bechtel Parsons Blue Grass, A Joint Venture |
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 $8.96 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 PSC F contractors in Aug 2025–Jul 2026?
1. Amentum Holdings, Inc. ($1.48B), 2. Southern Ohio Cleanup Company LLC ($144M), 3. BWX Technologies, Inc. ($141M), 4. Helicopter Express LLC ($140M), 5. Calista Corp ($134M), 6. L3Harris Technologies, Inc. ($131M), 7. Environmental Restoration LLC ($130M), 8. West Valley Cleanup Alliance, LLC ($122M), 9. Guidehouse Inc. ($121M), 10. Bechtel Parsons Blue Grass, A Joint Venture ($120M).
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