Top 50 Contractors in PSC Z1KF: Maintenance of Dredging Facilities, 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 Z1KF: Maintenance of Dredging Facilities, FY2025.
The top 10 won 68% of PSC Z1KF contract dollars from August 2025 through July 2026
Ranking facts
- Contract obligations
- $764,302,338 Net of deobligations, by contracts coded PSC Z1KF
- Contractors
- 53 Parent companies with an obligation
- Largest contractor
- Donjon Marine Co., LLC $115 million, 13.6% of obligations
- Data as of
Contract actions from FPDS (SAM.gov). How the rankings work · Download all 50 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)
Full ranking
| Rank | Contractor | Net obligations | Share | Trend |
|---|---|---|---|---|
| 1 |
Donjon Marine Co., LLC
Top agencies
|
$114,953,110 | ||
| 2 | $101,931,563 | |||
| 3 | $73,410,533 | |||
| 4 |
Peter Kiewit Sons', Inc.
Top agencies
|
$57,603,719 | ||
| 5 |
The Dutra Group
Top agencies
|
$52,185,444 | ||
| 6 | $48,754,917 | |||
| 7 |
Norfolk Dredging Company
Top agencies
|
$40,037,419 | ||
| 8 | $35,139,174 | |||
| 9 | $29,070,201 | |||
| 10 |
Marinex Construction Inc.
Top agencies
|
$26,265,692 | ||
| 11 | $19,616,751 | |||
| 12 |
Mike Hooks, LLC
Top agencies
|
$17,868,250 | ||
| 13 |
Maverick Constructors, LLC
Top agencies
|
$15,467,555 | ||
| 14 |
Muddy Water Dredging LP
Top agencies
|
$15,118,052 | ||
| 15 |
Manson Construction Co
Top agencies
|
$9,087,261 | ||
| 16 | $8,693,100 | |||
| 17 |
Coastal Dredging Co, Inc.
Top agencies
|
$8,335,212 | ||
| 18 |
Southern Dredging Co Inc.
Top agencies
|
$8,259,900 | ||
| 19 |
Precision Construction LLC
Top agencies
|
$7,967,249 | ||
| 20 |
Spectraserv Inc.
Top agencies
|
$7,396,955 | ||
| 21 |
L S Marine Inc
Top agencies
|
$7,374,400 | ||
| 22 |
Kokosing Industrial Inc.
Top agencies
|
$6,757,900 | ||
| 23 | $6,092,664 | |||
| 24 | $5,962,000 | |||
| 25 | $5,663,488 | |||
| 26 |
Amherst Madison, Inc.
Top agencies
|
$4,890,466 | ||
| 27 |
Seacoast Construction Inc.
Top agencies
|
$4,169,000 | ||
| 28 |
H & L Contracting LLC
Top agencies
|
$4,023,690 | ||
| 29 |
Texas Dewatering LLC
Top agencies
|
$3,859,360 | ||
| 30 |
JD Bravo Co Inc.
Top agencies
|
$3,718,439 | ||
| 31 | $3,569,425 | |||
| 32 |
Clore Equipment LLC
Top agencies
|
$3,309,753 | ||
| 33 |
US Aqua Services LLC
Top agencies
|
$2,783,000 | ||
| 34 |
DOT Construction, Inc.
Top agencies
|
$2,690,185 | ||
| 35 | $2,253,692 | |||
| 36 |
Dredgit Corporation
Top agencies
|
$1,831,665 | ||
| 37 | $1,649,660 | |||
| 38 | $1,608,230 | |||
| 39 |
Aqua Survey, Inc.
Top agencies
|
$1,488,166 | ||
| 40 | $982,500 | |||
| 41 |
Battelle Memorial Institute
Top agencies
|
$816,537 | ||
| 42 |
AECOM
Top agencies
|
$799,853 | ||
| 43 |
Galvin Bros., Inc.
Top agencies
|
$587,500 | ||
| 44 | $498,475 | |||
| 45 |
Herve Cody Contractor LLC
Top agencies
|
$422,178 | ||
| 46 |
Better By Design LLC
Top agencies
|
$243,319 | ||
| 47 | $115,868 | |||
| 48 |
Lucianos Excavation Inc.
Top agencies
|
$76,298 | ||
| 49 |
AGM Marine Contractors Inc.
Top agencies
|
$20,000 | ||
| 50 | $20,000 |
Show 25 more
50 of 53 contractors listed here. See the rest on GovTribe.
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 $848 million 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 Z1KF contractors in Aug 2025–Jul 2026?
1. Donjon Marine Co., LLC ($115M), 2. Great Lakes Dredge & Dock Corporation ($102M), 3. Curtin Maritime Corp ($73.4M), 4. Peter Kiewit Sons', Inc. ($57.6M), 5. The Dutra Group ($52.2M), 6. Cottrell Contracting Corporation ($48.8M), 7. Norfolk Dredging Company ($40M), 8. Inland Dredging Company, L.L.C. ($35.1M), 9. Cashman Dredging & Marine Contracting Co LLC ($29.1M), 10. Marinex Construction Inc. ($26.3M).
On GovTribe
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