Top 100 Contractors in PSC Z1: Maintenance, Alteration, Repair Buildings, 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 Z1: Maintenance, Alteration, Repair Buildings, FY2025.
The top 10 won 22% of PSC Z1 contract dollars from August 2025 through July 2026
Ranking facts
- Contract obligations
- $8,362,909,300 Net of deobligations, by contracts coded PSC Z1 or a code under it
- Contractors
- 2,987 Parent companies with an obligation
- Largest contractor
- Amentum Holdings, Inc. $743 million, 8.4% 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 | $742,981,587 | |||
| 2 |
J & J Maintenance Inc.
|
$158,882,636 | ||
| 3 | $152,438,686 | |||
| 4 | $134,787,335 | |||
| 5 | $131,648,382 | |||
| 6 |
Peter Kiewit Sons', Inc.
Top agencies
|
$130,123,744 | ||
| 7 | $129,844,797 | |||
| 8 |
Donjon Marine Co., LLC
Top agencies
|
$114,953,110 | ||
| 9 | $113,007,038 | |||
| 10 | $108,443,151 | |||
| 11 | $96,682,923 | |||
| 12 | $89,771,227 | |||
| 13 |
Fluor Corporation
Top agencies
|
$86,942,494 | ||
| 14 | $86,358,795 | |||
| 15 | $79,746,863 | |||
| 16 |
The Dutra Group
Top agencies
|
$77,927,444 | ||
| 17 | $74,482,041 | |||
| 18 |
Pegasus Support Services LLC
|
$69,426,050 | ||
| 19 |
Emcor Group Inc.
|
$68,597,996 | ||
| 20 |
Alberici Constructors Inc.
Top agencies
|
$68,493,627 | ||
| 21 | $62,627,327 | |||
| 22 | $62,551,320 | |||
| 23 | $61,849,469 | |||
| 24 | $55,550,280 | |||
| 25 | $55,228,515 | |||
| 26 | $54,348,030 | |||
| 27 | $51,978,476 | |||
| 28 |
Tatitlek Corporation
Top agencies
|
$50,817,457 | ||
| 29 | $50,659,632 | |||
| 30 | $48,754,917 | |||
| 31 |
Valiant Integrated Services LLC
|
$47,687,007 | ||
| 32 |
Mike Hooks, LLC
Top agencies
|
$47,399,150 | ||
| 33 | $47,279,808 | |||
| 34 |
Amerifield JV LLC
Top agencies
|
$45,603,496 | ||
| 35 |
Weston Solutions Holdings Inc
|
$42,739,824 | ||
| 36 |
V2X, Inc.
Top agencies
|
$40,093,481 | ||
| 37 |
Norfolk Dredging Company
Top agencies
|
$40,037,419 | ||
| 38 | $38,286,848 | |||
| 39 | $36,724,577 | |||
| 40 | $36,578,227 | |||
| 41 | $35,209,775 | |||
| 42 | $33,815,525 | |||
| 43 | $33,646,916 | |||
| 44 | $32,537,926 | |||
| 45 | $32,267,704 | |||
| 46 | $30,410,718 | |||
| 47 |
Guidehouse Inc.
Top agencies
|
$30,042,255 | ||
| 48 | $29,070,201 | |||
| 49 | $28,371,841 | |||
| 50 | $28,211,299 | |||
| 51 | $28,008,865 | |||
| 52 | $27,456,112 | |||
| 53 | $26,502,622 | |||
| 54 | $26,407,934 | |||
| 55 |
Marinex Construction Inc.
Top agencies
|
$25,319,849 | ||
| 56 | $25,149,113 | |||
| 57 |
Akima Facilities Operations LLC
Top agencies
|
$25,005,672 | ||
| 58 | $24,401,780 | |||
| 59 | $24,256,995 | |||
| 60 | $24,194,380 | |||
| 61 |
SNC Tallimat, LLC
Top agencies
|
$24,107,345 | ||
| 62 | $23,334,646 | |||
| 63 | $23,311,960 | |||
| 64 | $23,087,400 | |||
| 65 | $22,954,198 | |||
| 66 |
Red Eagle 3 JV
Top agencies
|
$22,859,800 | ||
| 67 |
Andercorp LLC
Top agencies
|
$22,791,582 | ||
| 68 | $22,191,000 | |||
| 69 | $22,154,447 | |||
| 70 | $21,911,485 | |||
| 71 | $21,880,967 | |||
| 72 |
Riley Contracting Group Inc.
Top agencies
|
$21,708,236 | ||
| 73 | $21,699,507 | |||
| 74 | $21,420,403 | |||
| 75 | $21,303,096 | |||
| 76 |
Callan Marine Limited
Top agencies
|
$20,640,494 | ||
| 77 | $20,535,990 | |||
| 78 | $20,422,139 | |||
| 79 | $20,268,832 | |||
| 80 | $20,184,563 | |||
| 81 | $19,967,815 | |||
| 82 | $19,896,306 | |||
| 83 | $19,616,751 | |||
| 84 |
Maverick Constructors, LLC
Top agencies
|
$19,469,815 | ||
| 85 | $19,361,093 | |||
| 86 |
Columbus Barricades, Inc.
Top agencies
|
$19,012,390 | ||
| 87 |
CJW Contractors, Inc.
Top agencies
|
$18,770,852 | ||
| 88 | $18,448,798 | |||
| 89 | $18,050,260 | |||
| 90 | $17,977,093 | |||
| 91 | $17,693,364 | |||
| 92 | $17,418,575 | |||
| 93 | $17,185,758 | |||
| 94 | $17,154,700 | |||
| 95 | $17,055,100 | |||
| 96 | $17,041,096 | |||
| 97 | $16,957,347 | |||
| 98 |
Siemens Corporation
|
$16,931,676 | ||
| 99 | $16,684,169 | |||
| 100 | $16,661,543 |
Show 75 more
100 of 2,987 contractors listed here. See the rest on GovTribe.
Rankings for the codes under PSC Z1
Show all 34
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 $8.9 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 Z1 contractors in Aug 2025–Jul 2026?
1. Amentum Holdings, Inc. ($743M), 2. J & J Maintenance Inc. ($159M), 3. Afognak Native Corporation ($152M), 4. S & K Security Group LLC ($135M), 5. Arctic Slope Regional Corporation ($132M), 6. Peter Kiewit Sons', Inc. ($130M), 7. Bristol Bay Native Corporation ($130M), 8. Donjon Marine Co., LLC ($115M), 9. Orion Marine Construction, Inc. ($113M), 10. Curtin Maritime Corp ($108M).
On GovTribe
Research every contractor on this list
- Every contract, task order and IDV they hold
- Their subsidiaries, teammates and competitors
- Open opportunities they're positioned for
- Alerts when they win new work