Top 100 Contractors in PSC B5: Special Studies – Not R&D, Jul 2025–Jun 2026
Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe
The top 10 won 30% of PSC B5 contract dollars from July 2025 through June 2026
Ranking facts
- Contract obligations
- $2,476,129,883 Net of deobligations, by contracts coded PSC B5 or a code under it
- Contractors
- 1,686 Parent companies with an obligation
- Largest contractor
- Parsons Corporation $172 million, 5.6% of obligations
- Data as of
Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV
Full ranking
| Rank | Contractor | Net obligations | Share | Trend |
|---|---|---|---|---|
| 1 | $171,847,738 | |||
| 2 |
Johns Hopkins University
|
$141,702,420 | ||
| 3 | $123,939,225 | |||
| 4 | $113,027,159 | |||
| 5 | $98,325,525 | |||
| 6 | $74,438,021 | |||
| 7 | $55,922,442 | |||
| 8 | $48,867,633 | |||
| 9 |
Educational Testing Service
Top agencies
|
$46,171,492 | ||
| 10 |
Guidehouse Inc.
|
$40,653,166 | ||
| 11 | $39,518,042 | |||
| 12 |
American Institute In Taiwan
Top agencies
|
$38,906,757 | ||
| 13 |
Amentum Holdings, Inc.
Top agencies
|
$38,867,641 | ||
| 14 | $34,832,918 | |||
| 15 |
Unwin Co
Top agencies
|
$29,341,481 | ||
| 16 |
Gulf South Research Corp
|
$26,762,481 | ||
| 17 |
ManTech International Corporation
|
$24,865,444 | ||
| 18 | $23,348,339 | |||
| 19 | $22,723,760 | |||
| 20 | $22,286,901 | |||
| 21 |
Merrick & Company
Top agencies
|
$22,056,706 | ||
| 22 |
Fors Marsh Group LLC
Top agencies
|
$20,727,800 | ||
| 23 | $20,036,313 | |||
| 24 | $19,153,280 | |||
| 25 |
Everfox LLC
Top agencies
|
$18,893,942 | ||
| 26 | $16,827,069 | |||
| 27 |
Iqvia Government Solutions Inc
Top agencies
|
$16,535,434 | ||
| 28 |
Asco Power Services Inc
Top agencies
|
$16,172,397 | ||
| 29 |
Rpi-Css, LLC
Top agencies
|
$15,315,627 | ||
| 30 | $14,752,055 | |||
| 31 |
Technomics Inc.
Top agencies
|
$14,741,049 | ||
| 32 | $14,468,548 | |||
| 33 |
Pavcon LLC
Top agencies
|
$13,872,591 | ||
| 34 | $13,789,544 | |||
| 35 |
Olgoonik Solutions LLC
Top agencies
|
$12,997,337 | ||
| 36 | $12,839,120 | |||
| 37 | $12,591,561 | |||
| 38 |
ASR Analytics, LLC
Top agencies
|
$12,471,885 | ||
| 39 | $12,374,136 | |||
| 40 | $12,235,000 | |||
| 41 |
Hdr, Inc.
Top agencies
|
$12,004,888 | ||
| 42 |
Semanticbits LLC
|
$11,875,445 | ||
| 43 | $11,691,259 | |||
| 44 | $11,650,469 | |||
| 45 | $10,672,279 | |||
| 46 | $10,602,356 | |||
| 47 | $10,380,623 | |||
| 48 |
Janus Research Group, LLC
Top agencies
|
$10,079,747 | ||
| 49 | $10,016,003 | |||
| 50 | $9,616,793 | |||
| 51 | $9,553,729 | |||
| 52 |
CEG Solutions LLC
Top agencies
|
$9,500,000 | ||
| 53 | $9,450,962 | |||
| 54 | $9,341,166 | |||
| 55 | $9,286,130 | |||
| 56 |
Linquest Corporation
Top agencies
|
$9,249,586 | ||
| 57 | $9,135,021 | |||
| 58 | $9,018,750 | |||
| 59 | $8,988,159 | |||
| 60 | $8,945,899 | |||
| 61 | $8,731,862 | |||
| 62 | $8,556,214 | |||
| 63 | $8,393,259 | |||
| 64 | $8,032,616 | |||
| 65 |
Veregy, LLC
Top agencies
|
$7,941,727 | ||
| 66 |
Pearson PLC
Top agencies
|
$7,277,746 | ||
| 67 | $7,176,350 | |||
| 68 | $7,000,000 | |||
| 69 | $6,735,110 | |||
| 70 | $6,566,804 | |||
| 71 | $6,041,662 | |||
| 72 |
KPB Services LLC
Top agencies
|
$5,944,948 | ||
| 73 | $5,838,711 | |||
| 74 | $5,637,200 | |||
| 75 |
Jacobs Government Services Company
Top agencies
|
$5,465,312 | ||
| 76 |
Acumen LLC
Top agencies
|
$5,450,000 | ||
| 77 |
Excella, LLC
Top agencies
|
$5,384,186 | ||
| 78 | $5,383,151 | |||
| 79 |
Indewater LLC
Top agencies
|
$5,317,000 | ||
| 80 |
Ardl Inc.
Top agencies
|
$5,154,214 | ||
| 81 | $5,149,005 | |||
| 82 | $5,140,327 | |||
| 83 | $5,073,623 | |||
| 84 | $5,046,768 | |||
| 85 | $5,042,711 | |||
| 86 | $4,989,078 | |||
| 87 | $4,980,197 | |||
| 88 | $4,887,303 | |||
| 89 | $4,854,557 | |||
| 90 |
Gryphon Technologies L.C.
Top agencies
|
$4,835,549 | ||
| 91 | $4,803,015 | |||
| 92 | $4,704,899 | |||
| 93 | $4,535,634 | |||
| 94 |
The Precision Group, LLC
Top agencies
|
$4,471,426 | ||
| 95 | $4,465,346 | |||
| 96 |
Redhorse Corporation
Top agencies
|
$4,458,661 | ||
| 97 | $4,439,747 | |||
| 98 | $4,402,987 | |||
| 99 |
Source Healthcare Analytics LLC
Top agencies
|
$4,378,960 | ||
| 100 |
Frontier Technology Inc.
Top agencies
|
$4,315,631 |
Show 75 more
100 of 1,686 contractors listed here. See the rest on GovTribe.
Rankings for the codes under PSC B5
| Code | Net obligations | Largest contractor |
|---|---|---|
| B541 Defense Studies | $582,663,253 | Parsons Corporation |
| B599 Other Special Studies and Analysis | $349,793,002 | Research Triangle Institute |
| B506 Data Analysis (other than scientific) | $276,817,457 | Westat, Inc. |
| B510 Environmental Studies and Assessments | $236,652,451 | Amentum Holdings, Inc. |
| B529 Scientific Data Studies | $142,060,017 | ManTech International Corporation |
| B507 Economic Studies | $119,680,477 | Booz Allen Hamilton Holding Corporation |
| B537 Medical and Health Studies | $96,544,165 | Empower AI, Inc. |
| B504 Chemical/Biological Studies and Analysis | $49,316,820 | Merrick & Company |
| B503 Archeological/Paleontological Studies | $32,974,959 | New South Associates, Inc. |
| B542 Educational Studies and Analysis | $32,725,609 | Applied Enterprise Management Corporation |
| B544 Technology Studies | $30,383,516 | Forrester Research, Inc. |
| B528 Regulatory Studies | $27,329,864 | Deloitte |
| B516 Animal and Fisheries Studies | $20,854,555 | Atlantic States Marine Fisheries Commission |
| B509 Endangered Species Studies – Plant and Animal | $17,052,035 | Everfox LLC |
| B502 Air Quality Analysis | $9,981,874 | University of California, Davis |
| B533 Water Quality Studies | $9,769,356 | Phigenics LLC |
| B525 Natural Resource Studies | $3,882,803 | Eastern Research Group Inc. |
| B534 Wildlife Studies | $2,142,461 | Gulf States Marine Fisheries Commission |
| B517 Geological Studies | $1,961,588 | Central Geotechnical Services LLC |
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 $3.07 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. 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 Jul 2024–Jun 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 Jul 2025–Jun 2026?
1. Parsons Corporation ($172M), 2. Johns Hopkins University ($142M), 3. The Rand Corporation ($124M), 4. Booz Allen Hamilton Holding Corporation ($113M), 5. The CNA Corporation ($98.3M), 6. Research Triangle Institute ($74.4M), 7. Deloitte ($55.9M), 8. Ameresco Inc. ($48.9M), 9. Educational Testing Service ($46.2M), 10. Guidehouse Inc. ($40.7M).
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