Top 100 Contractors in PSC B599: Other Special Studies and Analysis, FY2025

Name: Top 100 Contractors in PSC B599: Other Special Studies and Analysis, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 66% of FY2025 PSC B599 contract dollars

Contract obligations: $302,502,035 Net of deobligations, by contracts coded PSC B599
Contractors: 261 Parent companies with an obligation
Largest contractor: Booz Allen Hamilton Holding Corporation $60.2 million, 16.8% of obligations
Data as of: Oct 14, 2026

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	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies NASA (National Aeronautics and Space Administration) VA (Department of Veterans Affairs)	$60,214,894	16.8%	Rank history: #2 in FY2021, #1 in FY2022, #1 in FY2023 and #2 in FY2024; up 1 since FY2024.
2	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation)	$55,443,672	15.5%	Rank history: #1 in FY2021, #2 in FY2022, #2 in FY2023 and #1 in FY2024; down 1 since FY2024.
3	The Rand Corporation Top agencies USAF (Department of the Air Force)	$44,760,780	12.5%	Rank history: #3 in FY2021, #3 in FY2022, #3 in FY2023 and #6 in FY2024; up 3 since FY2024.
4	American Institute In Taiwan Top agencies DOS (Department of State)	$15,332,827	4.3%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2023 and #29 in FY2024; up 25 since FY2024.
5	Fors Marsh Group LLC Top agencies DHRA (Defense Human Resources Activity) HHS (Department of Health and Human Services)	$14,310,602	4.0%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2024; up 3 since FY2024.
6	Janus Research Group, LLC Top agencies Army (Department of the Army)	$13,244,728	3.7%	Rank history: #4 in FY2021, #4 in FY2022, #5 in FY2023 and #9 in FY2024; up 3 since FY2024.
7	Emory University Top agencies HHS (Department of Health and Human Services)	$12,571,332	3.5%	Rank history: not on the FY2021 list, #14 in FY2022, #4 in FY2023 and #17 in FY2024; up 10 since FY2024.
8	Baylor College of Medicine Top agencies HHS (Department of Health and Human Services)	$7,176,349	2.0%	Rank history: #11 in FY2021, #15 in FY2022, #7 in FY2023 and #7 in FY2024; down 1 since FY2024.
9	Group W Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$6,501,608	1.8%	Rank history: #13 in FY2021, #26 in FY2022, #27 in FY2023 and #14 in FY2024; up 5 since FY2024.
10	Tanaq Management Services LLC Top agencies HHS (Department of Health and Human Services)	$5,757,252	1.6%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023 and #16 in FY2024; up 6 since FY2024.
11	Bluefoot Inc. Top agencies USAF (Department of the Air Force)	$5,720,000	1.6%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2024; up 33 since FY2024.
12	Mid Atlantic Technical and Executive Consulting, LLC Top agencies Navy (Department of the Navy)	$5,298,766	1.5%	Rank history: #22 in FY2021, #22 in FY2022, #8 in FY2023 and #11 in FY2024; down 1 since FY2024.
13	The Broad Institute, Inc. Top agencies HHS (Department of Health and Human Services)	$4,790,857	1.3%	Rank history: #7 in FY2021, #13 in FY2022, #19 in FY2023 and #5 in FY2024; down 8 since FY2024.
14	JBS International, Inc. Top agencies DOL (Department of Labor)	$4,467,777	1.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2024; up 57 since FY2024.
15	Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force)	$4,392,092	1.2%	Rank history: not on the FY2021–FY2024 lists; up 89 since FY2024.
16	Mckinsey & Company, Inc. Washington D.c. Top agencies USAF (Department of the Air Force)	$4,098,600	1.1%	Rank history: not on the FY2021–FY2024 lists; new.
17	Everfox LLC Top agencies USAF (Department of the Air Force)	$3,515,402	1.0%	Rank history: not on the FY2021–FY2024 lists; new.
18	The Leland Stanford Junior University Top agencies HHS (Department of Health and Human Services)	$3,136,008	0.9%	Rank history: not on the FY2021–FY2023 lists and #38 in FY2024; up 20 since FY2024.
19	Iteris, Inc. Top agencies DOT (Department of Transportation)	$2,950,000	0.8%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2023 and #24 in FY2024; up 5 since FY2024.
20	Valiant Global Defense Services Inc. Top agencies Army (Department of the Army)	$2,757,032	0.8%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2024; up 17 since FY2024.
21	National Opinion Research Center Top agencies NSF (National Science Foundation)	$2,142,924	0.6%	Rank history: not on the FY2021 list, #53 in FY2022, #69 in FY2023 and #27 in FY2024; up 6 since FY2024.
22	First Environment Inc. Top agencies Army (Department of the Army)	$2,117,724	0.6%	Rank history: #24 in FY2021, #64 in FY2022, #81 in FY2023 and #22 in FY2024; unchanged since FY2024.
23	MPF Federal, LLC Top agencies HHS (Department of Health and Human Services)	$2,101,386	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
24	Fleming Gannett Inc Through GFT Infrastructure, Inc. Top agencies Army (Department of the Army)	$1,884,974	0.5%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2024; up 22 since FY2024.
25	Ignite Fueling Innovation Inc. Top agencies Army (Department of the Army)	$1,681,197	0.5%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2023 and #30 in FY2024; up 5 since FY2024.
26	Nisga'a Mostt, LLC Top agencies Army (Department of the Army)	$1,584,849	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
27	CAE USA Inc. Top agencies Army (Department of the Army)	$1,527,368	0.4%	Rank history: not on the FY2021–FY2023 lists and #47 in FY2024; up 20 since FY2024.
28	Hydros Consulting Inc. Top agencies DOI (Department of the Interior)	$1,507,918	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
29	New York Genome Center, Inc. Top agencies HHS (Department of Health and Human Services)	$1,492,431	0.4%	Rank history: #15 in FY2021, not on the FY2022 list, #72 in FY2023 and #15 in FY2024; down 14 since FY2024.
30	Converge Federal Solutions JV, LLC Top agencies Army (Department of the Army)	$1,461,428	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
31	Goldbelt Professional Services, LLC Top agencies HHS (Department of Health and Human Services)	$1,312,038	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
32	Boudreau Associates LLC Top agencies Army (Department of the Army)	$1,292,236	0.4%	Rank history: #41 in FY2021, #52 in FY2022, #52 in FY2023 and #51 in FY2024; up 19 since FY2024.
33	FI Consulting, Inc. Top agencies Treasury (Department of the Treasury)	$1,264,663	0.4%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #50 in FY2024; up 17 since FY2024.
34	LMI Consulting, LLC Top agencies HHS (Department of Health and Human Services)	$1,129,344	0.3%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2024; up 1 since FY2024.
35	Sierra Hydrographics Top agencies Army (Department of the Army)	$1,066,632	0.3%	Rank history: #95 in FY2021, #51 in FY2022, #43 in FY2023 and #28 in FY2024; down 7 since FY2024.
36	Sri International Top agencies NSF (National Science Foundation)	$961,818	0.3%	Rank history: #28 in FY2021, #62 in FY2022, not on the FY2023 list and #77 in FY2024; up 41 since FY2024.
37	Barbaricum LLC Top agencies USAF (Department of the Air Force)	$902,349	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
38	Rhodium Group LLC Top agencies USAF (Department of the Air Force)	$850,000	0.2%	Rank history: not on the FY2021–FY2022 lists, #32 in FY2023 and not on the FY2024 list; up 80 since FY2024.
39	Ernst & Young LLP Top agencies EXIM (Export Import Bank of the US)	$850,000	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
40	American Institutes for Research In the Behavioral Sciences Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation)	$833,823	0.2%	Rank history: #46 in FY2021, #43 in FY2022, #65 in FY2023 and #60 in FY2024; up 20 since FY2024.
41	Lynchval Systems Worldwide, Inc. Top agencies PBGC (Pension Benefit Guaranty Corporation)	$777,044	0.2%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2024; up 1 since FY2024.
42	Bryce Space and Technology, LLC Top agencies USAF (Department of the Air Force)	$745,000	0.2%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and not on the FY2024 list; returned.
43	University of Washington Top agencies HHS (Department of Health and Human Services)	$717,393	0.2%	Rank history: #25 in FY2021, #19 in FY2022, #22 in FY2023 and #19 in FY2024; down 24 since FY2024.
44	Virginia Commercial Space Flight Authority Top agencies NASA (National Aeronautics and Space Administration)	$659,305	0.2%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2024; up 31 since FY2024.
45	Castro & Company, LLC Top agencies MCC (Millennium Challenge Corporation)	$641,380	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
46	Parsons Corporation Through Parsons Government Services Inc. Top agencies Navy (Department of the Navy)	$627,298	0.2%	Rank history: #73 in FY2021, not on the FY2022 list, #80 in FY2023 and #68 in FY2024; up 22 since FY2024.
47	Virginia Commonwealth University Through Virginia Polytechnic Institute & State University Top agencies DOT (Department of Transportation)	$604,936	0.2%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2023 and #70 in FY2024; up 23 since FY2024.
48	Anthrotech Inc. Top agencies Navy (Department of the Navy)	$602,573	0.2%	Rank history: not on the FY2021–FY2022 lists, #55 in FY2023 and #43 in FY2024; down 5 since FY2024.
49	Pueo Business Solutions LLC Top agencies DOD (Department of Defense)	$602,193	0.2%	Rank history: not on the FY2021 list, #79 in FY2022, #87 in FY2023 and #74 in FY2024; up 25 since FY2024.
50	Whitney Strategic Services LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$594,000	0.2%	Rank history: not on the FY2021–FY2023 lists and #58 in FY2024; up 8 since FY2024.
51	DR Reed & Associates, Inc. Top agencies Army (Department of the Army)	$593,776	0.2%	Rank history: not on the FY2021–FY2023 lists and #95 in FY2024; up 44 since FY2024.
52	The Urban Institute Top agencies Treasury (Department of the Treasury)	$589,531	0.2%	Rank history: not on the FY2021–FY2022 lists, #60 in FY2023 and #66 in FY2024; up 14 since FY2024.
53	Rational Futures Inc. Top agencies USAF (Department of the Air Force)	$568,835	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
54	Purvis Systems Inc Top agencies Navy (Department of the Navy)	$563,039	0.2%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2024; up 8 since FY2024.
55	KCG Engineering Group, Inc. Top agencies Navy (Department of the Navy)	$527,958	0.1%	Rank history: #62 in FY2021, #82 in FY2022, #78 in FY2023 and #65 in FY2024; up 10 since FY2024.
56	Cultural Resource Analysts, Inc. Top agencies USDA (Department of Agriculture)	$481,624	0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2024; up 24 since FY2024.
57	E.f. Kearney, Limited Through Kearney & Company, P.C. Top agencies MCC (Millennium Challenge Corporation)	$460,841	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
58	M3 Works LLC Top agencies USDA (Department of Agriculture)	$418,000	0.1%	Rank history: not on the FY2021–FY2023 lists and #93 in FY2024; up 35 since FY2024.
59	Trustees of Boston University Top agencies VA (Department of Veterans Affairs)	$409,606	0.1%	Rank history: not on the FY2021 list, #85 in FY2022, #89 in FY2023 and #85 in FY2024; up 26 since FY2024.
60	The Peak Inc Top agencies USAF (Department of the Air Force)	$409,241	0.1%	Rank history: not on the FY2021–FY2023 lists and #99 in FY2024; up 39 since FY2024.
61	BCT Partners LLC Top agencies DOJ (Department of Justice)	$377,763	0.1%	Rank history: #44 in FY2021, #84 in FY2022 and not on the FY2023–FY2024 lists; up 69 since FY2024.
62	Cooper Zietz Engineers, Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$349,194	0.1%	Rank history: #21 in FY2021, #23 in FY2022, #10 in FY2023 and #18 in FY2024; down 44 since FY2024.
63	Core Human Factors, Inc. Top agencies HHS (Department of Health and Human Services)	$307,090	0.1%	Rank history: not on the FY2021–FY2023 lists and #92 in FY2024; up 29 since FY2024.
64	S&P Global Market Intelligence LLC Top agencies SBA (Small Business Administration) PBGC (Pension Benefit Guaranty Corporation)	$295,441	0.1%	Rank history: not on the FY2021–FY2024 lists; up 46 since FY2024.
65	Dj&A, P.C. Top agencies DOI (Department of the Interior)	$293,862	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
66	Spider Strategies, Inc. Top agencies Army (Department of the Army)	$287,501	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
67	Beautiful Environmental Construction Co., Ltd. Top agencies USAF (Department of the Air Force)	$279,115	0.1%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and #64 in FY2024; down 3 since FY2024.
68	LWH Enterprises Inc Top agencies HHS (Department of Health and Human Services)	$275,443	0.1%	Rank history: not on the FY2021–FY2024 lists; up 48 since FY2024.
69	Florida Department of Health Top agencies DHS (Department of Homeland Security)	$270,000	0.1%	Rank history: not on the FY2021–FY2024 lists; up 38 since FY2024.
70	Chugai Technos Corporation Top agencies Army (Department of the Army)	$259,877	0.1%	Rank history: not on the FY2021–FY2024 lists; up 61 since FY2024.
71	Dynamic Science, Inc. Top agencies DOT (Department of Transportation)	$252,900	0.1%	Rank history: not on the FY2021–FY2024 lists; up 134 since FY2024.
72	Affiliated Engineers Metro DC, Inc. Top agencies HHS (Department of Health and Human Services)	$251,446	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
73	Compagnie Maritime D'expertises Top agencies NASA (National Aeronautics and Space Administration)	$247,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
74	OMP Inc. Top agencies NASA (National Aeronautics and Space Administration)	$245,000	0.1%	Rank history: not on the FY2021–FY2024 lists; up 81 since FY2024.
75	Vannevar Labs, Inc. Top agencies DOS (Department of State)	$245,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	Bolton Partners, Inc. Top agencies PBGC (Pension Benefit Guaranty Corporation)	$241,563	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
77	Burns Engineering, Inc. Top agencies DOT (Department of Transportation)	$237,689	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
78	Concost Co.,Ltd Top agencies OSD (Office of the Secretary of Defense)	$236,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
79	The Cherokee Nation Through Cherokee Strategic Solutions, L.L.C. Top agencies Army (Department of the Army)	$233,727	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
80	Fedsight-Jpi JV LLC Top agencies EPA (Environmental Protection Agency)	$232,943	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
81	Ibex It Business Experts LLC Top agencies HHS (Department of Health and Human Services)	$225,869	0.1%	Rank history: not on the FY2021–FY2024 lists; up 45 since FY2024.
82	Athena Consulting LLC Top agencies PBGC (Pension Benefit Guaranty Corporation)	$223,000	0.1%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2024; up 8 since FY2024.
83	SGS Korea Co.,Ltd Top agencies USAF (Department of the Air Force)	$222,738	0.1%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2024; up 15 since FY2024.
84	H-Plus ECO Ltd. Top agencies Navy (Department of the Navy)	$218,531	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023 and not on the FY2024 list; up 28 since FY2024.
85	AON Consulting, Inc. Top agencies DOJ (Department of Justice)	$211,450	0.1%	Rank history: not on the FY2021–FY2024 lists; up 51 since FY2024.
86	NEZ Perce Tribe Top agencies Army (Department of the Army)	$209,887	0.1%	Rank history: not on the FY2021–FY2024 lists; up 28 since FY2024.
87	Chickasaw Nation Through Corvid Technologies, LLC Top agencies Navy (Department of the Navy)	$209,526	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
88	Metropolitan Architects and Planners, Inc. Top agencies EPA (Environmental Protection Agency)	$202,101	0.1%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and not on the FY2024 list; up 47 since FY2024.
89	Colorado State University Top agencies Army (Department of the Army)	$195,677	0.1%	Rank history: not on the FY2021–FY2024 lists; up 76 since FY2024.
90	Navanti Group LLC Top agencies DLA (Defense Logistics Agency)	$178,500	<0.1%	Rank history: not on the FY2021 list, #90 in FY2022, #74 in FY2023 and not on the FY2024 list; up 21 since FY2024.
91	Relx Inc. 2 awardees, including Lexisnexis Special Services Inc. Top agencies Treasury (Department of the Treasury) Navy (Department of the Navy)	$175,523	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 52 since FY2024.
92	Honeywell International Inc. Top agencies NASA (National Aeronautics and Space Administration)	$175,000	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
93	Okinawa Environmental Analysis Center Co. Ltd. Top agencies Army (Department of the Army)	$163,464	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 61 since FY2024.
94	AECOM Technical Services, Inc. Top agencies DOT (Department of Transportation)	$151,957	<0.1%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2024; down 61 since FY2024.
95	Othram Inc. Top agencies Navy (Department of the Navy)	$148,867	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
96	Scout-Cardno Joint Venture LLC Top agencies Army (Department of the Army)	$143,469	<0.1%	Rank history: not on the FY2021–FY2023 lists and #59 in FY2024; down 37 since FY2024.
97	Concourse Federal Group LLC Top agencies VA (Department of Veterans Affairs)	$136,588	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
98	Hawaii International Environmental Services Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$128,244	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 44 since FY2024.
99	Fedwriters, Inc. Top agencies DOJ (Department of Justice)	$125,265	<0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023 and not on the FY2024 list; up 45 since FY2024.
100	Karina FG Esposito Top agencies WHS (DOD Washington Headquarters Service)	$124,200	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.

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100 of 261 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 $359 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. 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.
Fiscal year 2025 ran Oct 1, 2024 – Sep 30, 2025. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2024. "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. The step from FY2024 takes the color of the rank change beside it.
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 B599 contractors in FY2025?

1. Booz Allen Hamilton Holding Corporation ($60.2M), 2. Research Triangle Institute ($55.4M), 3. The Rand Corporation ($44.8M), 4. American Institute In Taiwan ($15.3M), 5. Fors Marsh Group LLC ($14.3M), 6. Janus Research Group, LLC ($13.2M), 7. Emory University ($12.6M), 8. Baylor College of Medicine ($7.18M), 9. Group W Inc. ($6.5M), 10. Tanaq Management Services LLC ($5.76M).

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