Top 100 Contractors in PSC B5: Special Studies – Not R&D, 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 B5: Special Studies – Not R&D, FY2025.
The top 10 won 30% of PSC B5 contract dollars from August 2025 through July 2026
Ranking facts
- Contract obligations
- $2,491,573,122 Net of deobligations, by contracts coded PSC B5 or a code under it
- Contractors
- 1,661 Parent companies with an obligation
- Largest contractor
- Johns Hopkins University $157 million, 5.1% 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 |
Johns Hopkins University
|
$156,638,632 | ||
| 2 | $143,680,768 | |||
| 3 | $132,219,019 | |||
| 4 | $129,544,478 | |||
| 5 | $88,282,539 | |||
| 6 | $78,502,221 | |||
| 7 | $53,780,181 | |||
| 8 | $51,099,358 | |||
| 9 |
Educational Testing Service
Top agencies
|
$47,283,768 | ||
| 10 |
Guidehouse Inc.
|
$45,256,149 | ||
| 11 | $39,518,042 | |||
| 12 |
Amentum Holdings, Inc.
Top agencies
|
$38,867,641 | ||
| 13 |
Merrick & Company
|
$38,243,844 | ||
| 14 |
American Institute In Taiwan
Top agencies
|
$37,732,932 | ||
| 15 |
Unwin Co
Top agencies
|
$29,341,481 | ||
| 16 | $28,426,908 | |||
| 17 |
Gulf South Research Corp
|
$26,812,317 | ||
| 18 |
ManTech International Corporation
|
$24,646,689 | ||
| 19 | $23,382,590 | |||
| 20 |
Fors Marsh Group LLC
Top agencies
|
$21,348,327 | ||
| 21 | $20,971,277 | |||
| 22 | $20,259,174 | |||
| 23 | $19,062,787 | |||
| 24 |
Everfox LLC
Top agencies
|
$18,893,942 | ||
| 25 |
Iqvia Government Solutions Inc
Top agencies
|
$16,293,896 | ||
| 26 |
Schneider Electric USA Inc.
Top agencies
|
$16,172,397 | ||
| 27 | $15,930,991 | |||
| 28 |
Rpi-Css, LLC
Top agencies
|
$15,315,627 | ||
| 29 | $14,468,548 | |||
| 30 |
Janus Research Group, LLC
Top agencies
|
$14,081,916 | ||
| 31 |
Pavcon LLC
Top agencies
|
$13,872,591 | ||
| 32 | $13,778,768 | |||
| 33 |
Olgoonik Corporation
Top agencies
|
$13,707,528 | ||
| 34 |
ICF International Inc.
|
$13,707,398 | ||
| 35 | $13,311,862 | |||
| 36 | $13,254,366 | |||
| 37 |
ASR Analytics, LLC
Top agencies
|
$12,471,885 | ||
| 38 | $12,366,113 | |||
| 39 | $12,365,854 | |||
| 40 | $12,235,000 | |||
| 41 | $12,229,475 | |||
| 42 | $12,108,810 | |||
| 43 | $12,050,946 | |||
| 44 | $12,025,559 | |||
| 45 | $11,650,469 | |||
| 46 | $10,772,000 | |||
| 47 | $10,695,975 | |||
| 48 | $10,672,279 | |||
| 49 | $10,392,700 | |||
| 50 | $10,380,623 | |||
| 51 | $10,116,393 | |||
| 52 |
Kbr, Inc.
Top agencies
|
$9,858,621 | ||
| 53 | $9,616,793 | |||
| 54 | $9,606,443 | |||
| 55 |
CEG Solutions LLC
Top agencies
|
$9,500,000 | ||
| 56 | $8,945,899 | |||
| 57 | $8,891,308 | |||
| 58 | $8,731,862 | |||
| 59 | $8,701,651 | |||
| 60 | $8,393,259 | |||
| 61 | $8,033,072 | |||
| 62 |
Veregy, LLC
Top agencies
|
$7,941,727 | ||
| 63 | $7,908,930 | |||
| 64 | $7,602,356 | |||
| 65 |
Pearson PLC
Top agencies
|
$7,277,746 | ||
| 66 | $7,176,350 | |||
| 67 | $6,501,143 | |||
| 68 |
The Precision Group, LLC
Top agencies
|
$6,373,741 | ||
| 69 |
Acumen LLC
Top agencies
|
$6,262,692 | ||
| 70 | $6,041,662 | |||
| 71 | $6,034,692 | |||
| 72 |
KPB Services LLC
Top agencies
|
$5,944,948 | ||
| 73 |
Hdr, Inc.
Top agencies
|
$5,892,853 | ||
| 74 | $5,741,178 | |||
| 75 | $5,687,303 | |||
| 76 |
Koniag, Inc.
Top agencies
|
$5,637,200 | ||
| 77 |
Weelevateit LLC
Top agencies
|
$5,523,000 | ||
| 78 |
Jacobs Engineering Group Inc.
Top agencies
|
$5,465,312 | ||
| 79 |
Excella, LLC
Top agencies
|
$5,384,186 | ||
| 80 | $5,383,151 | |||
| 81 | $5,187,776 | |||
| 82 | $5,157,359 | |||
| 83 | $5,149,005 | |||
| 84 | $5,118,798 | |||
| 85 |
Ardl Inc.
Top agencies
|
$5,108,588 | ||
| 86 |
WSP USA Solutions Inc
|
$5,079,105 | ||
| 87 | $5,042,711 | |||
| 88 | $4,989,078 | |||
| 89 | $4,980,197 | |||
| 90 | $4,860,035 | |||
| 91 |
Gryphon Technologies L.C.
Top agencies
|
$4,835,549 | ||
| 92 | $4,670,584 | |||
| 93 |
Indewater LLC
Top agencies
|
$4,594,000 | ||
| 94 | $4,535,634 | |||
| 95 | $4,525,708 | |||
| 96 | $4,503,401 | |||
| 97 |
Titan Alpha LLC
Top agencies
|
$4,489,318 | ||
| 98 | $4,465,346 | |||
| 99 | $4,439,747 | |||
| 100 | $4,403,514 |
Show 75 more
100 of 1,661 contractors listed here. See the rest on GovTribe.
Rankings for the codes under PSC B5
| Code | Net obligations | Largest contractor |
|---|---|---|
| B541 Defense Studies | $566,452,621 | The Johns Hopkins University Applied Physics Laboratory LLC |
| B599 Other Special Studies and Analysis | $362,106,630 | Booz Allen Hamilton Holding Corporation |
| B506 Data Analysis (other than scientific) | $280,316,823 | Westat, Inc. |
| B510 Environmental Studies and Assessments | $250,726,496 | Amentum Holdings, Inc. |
| B529 Scientific Data Studies | $137,760,569 | ManTech International Corporation |
| B507 Economic Studies | $132,530,708 | Booz Allen Hamilton Holding Corporation |
| B537 Medical and Health Studies | $76,227,284 | Advanced Regenerative Manufacturing Institute Inc. |
| B504 Chemical/Biological Studies and Analysis | $65,333,853 | Merrick & Company |
| B542 Educational Studies and Analysis | $47,585,619 | Applied Enterprise Management Corporation |
| B503 Archeological/Paleontological Studies | $35,264,231 | New South Associates, Inc. |
| B544 Technology Studies | $29,930,648 | Forrester Research, Inc. |
| B516 Animal and Fisheries Studies | $26,565,471 | Atlantic States Marine Fisheries Commission |
| B509 Endangered Species Studies – Plant and Animal | $18,889,269 | Everfox LLC |
| B502 Air Quality Analysis | $12,341,688 | Air Resource Specialists, Inc. |
| B533 Water Quality Studies | $9,326,208 | Phigenics LLC |
| B519 Geotechnical Studies | $5,895,790 | Fugro USA Land, Inc. |
| B525 Natural Resource Studies | $3,842,705 | Eastern Research Group Inc. |
| B534 Wildlife Studies | $2,519,505 | Gulf States Marine Fisheries Commission |
| B517 Geological Studies | $2,468,012 | Athena Technologies 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 $3.04 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 B5 contractors in Aug 2025–Jul 2026?
1. Johns Hopkins University ($157M), 2. Parsons Corporation ($144M), 3. The Rand Corporation ($132M), 4. Booz Allen Hamilton Holding Corporation ($130M), 5. The CNA Corporation ($88.3M), 6. Research Triangle Institute ($78.5M), 7. Deloitte ($53.8M), 8. Westat, Inc. ($51.1M), 9. Educational Testing Service ($47.3M), 10. Guidehouse Inc. ($45.3M).
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