Top 100 Contractors in PSC B599: Other Special Studies and Analysis, Jul 2025–Jun 2026

Name: Top 100 Contractors in PSC B599: Other Special Studies and Analysis, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 69% of PSC B599 contract dollars from July 2025 through June 2026

Contract obligations: $349,793,002 Net of deobligations, by contracts coded PSC B599
Contractors: 239 Parent companies with an obligation
Largest contractor: Research Triangle Institute $55.5 million, 14.3% of obligations
Data as of: Oct 16, 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	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation)	$55,522,913	14.3%	Rank history: #1 in FY2021, #2 in FY2022, #2 in FY2023, #1 in FY2024 and #2 in FY2025; unchanged since Jul 2024–Jun 2025.
2	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies NASA (National Aeronautics and Space Administration) VA (Department of Veterans Affairs)	$54,758,776	14.1%	Rank history: #2 in FY2021, #1 in FY2022, #1 in FY2023, #2 in FY2024 and #1 in FY2025; unchanged since Jul 2024–Jun 2025.
3	The Rand Corporation Top agencies USAF (Department of the Air Force)	$47,279,897	12.2%	Rank history: #3 in FY2021, #3 in FY2022, #3 in FY2023, #6 in FY2024 and #3 in FY2025; unchanged since Jul 2024–Jun 2025.
4	American Institute In Taiwan Top agencies DOS (Department of State)	$38,906,757	10.0%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2023, #29 in FY2024 and #4 in FY2025; up 24 since Jul 2024–Jun 2025.
5	Fors Marsh Group LLC Top agencies DHRA (Defense Human Resources Activity)	$20,727,800	5.3%	Rank history: not on the FY2021–FY2023 lists, #8 in FY2024 and #5 in FY2025; up 18 since Jul 2024–Jun 2025.
6	The Boeing Company 4 awardees Top agencies USAF (Department of the Air Force)	$12,410,509	3.2%	Rank history: #5 in FY2021, #6 in FY2022, #13 in FY2023, #10 in FY2024 and not on the FY2025 list; up 5 since Jul 2024–Jun 2025.
7	Tanaq Management Services LLC Top agencies HHS (Department of Health and Human Services)	$12,229,475	3.1%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023, #16 in FY2024 and #10 in FY2025; up 9 since Jul 2024–Jun 2025.
8	Janus Research Group, LLC Top agencies Army (Department of the Army)	$10,079,747	2.6%	Rank history: #4 in FY2021, #4 in FY2022, #5 in FY2023, #9 in FY2024 and #6 in FY2025; down 1 since Jul 2024–Jun 2025.
9	Group W Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$9,216,003	2.4%	Rank history: #13 in FY2021, #26 in FY2022, #27 in FY2023, #14 in FY2024 and #9 in FY2025; up 1 since Jul 2024–Jun 2025.
10	Lockheed Martin Corporation 2 awardees Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$8,157,172	2.1%	Rank history: #98 in FY2021, #10 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
11	Emory University Top agencies HHS (Department of Health and Human Services)	$7,665,610	2.0%	Rank history: not on the FY2021 list, #14 in FY2022, #4 in FY2023, #17 in FY2024 and #7 in FY2025; down 2 since Jul 2024–Jun 2025.
12	Baylor College of Medicine Top agencies HHS (Department of Health and Human Services)	$7,176,350	1.8%	Rank history: #11 in FY2021, #15 in FY2022, #7 in FY2023, #7 in FY2024 and #8 in FY2025; down 6 since Jul 2024–Jun 2025.
13	Bluefoot Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$4,887,303	1.3%	Rank history: not on the FY2021–FY2023 lists, #44 in FY2024 and #11 in FY2025; up 2 since Jul 2024–Jun 2025.
14	The Broad Institute, Inc. Top agencies HHS (Department of Health and Human Services)	$4,789,557	1.2%	Rank history: #7 in FY2021, #13 in FY2022, #19 in FY2023, #5 in FY2024 and #13 in FY2025; down 10 since Jul 2024–Jun 2025.
15	Georgia TECH Applied Research Corp 2 awardees Top agencies USAF (Department of the Air Force)	$4,595,262	1.2%	Rank history: not on the FY2021–FY2024 lists and #15 in FY2025; up 28 since Jul 2024–Jun 2025.
16	Everfox LLC Top agencies USAF (Department of the Air Force)	$3,515,402	0.9%	Rank history: not on the FY2021–FY2024 lists and #17 in FY2025; new, not ranked in Jul 2024–Jun 2025.
17	Valiant Global Defense Services Inc. 2 awardees Top agencies Army (Department of the Army)	$3,310,981	0.9%	Rank history: not on the FY2021–FY2023 lists, #37 in FY2024 and #20 in FY2025; up 17 since Jul 2024–Jun 2025.
18	The Leland Stanford Junior University Top agencies HHS (Department of Health and Human Services)	$3,136,008	0.8%	Rank history: not on the FY2021–FY2023 lists, #38 in FY2024 and #18 in FY2025; up 23 since Jul 2024–Jun 2025.
19	Mathematica Inc. Top agencies DOL (Department of Labor)	$2,882,215	0.7%	Rank history: #18 in FY2021, #30 in FY2022, #6 in FY2023, #3 in FY2024 and not on the FY2025 list; down 11 since Jul 2024–Jun 2025.
20	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, #27 in FY2024 and #21 in FY2025; up 6 since Jul 2024–Jun 2025.
21	MPF Federal, LLC Top agencies HHS (Department of Health and Human Services)	$1,902,515	0.5%	Rank history: not on the FY2021–FY2024 lists and #23 in FY2025; up 9 since Jul 2024–Jun 2025.
22	New York Genome Center, Inc. Top agencies HHS (Department of Health and Human Services)	$1,890,886	0.5%	Rank history: #15 in FY2021, not on the FY2022 list, #72 in FY2023, #15 in FY2024 and #29 in FY2025; down 4 since Jul 2024–Jun 2025.
23	Barbaricum LLC Top agencies USAF (Department of the Air Force)	$1,794,014	0.5%	Rank history: not on the FY2021–FY2024 lists and #37 in FY2025; new, not ranked in Jul 2024–Jun 2025.
24	Implenomics Llcs Top agencies HHS (Department of Health and Human Services)	$1,769,799	0.5%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
25	Tech O. R., LLC Top agencies Army (Department of the Army)	$1,675,678	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
26	Black & Veatch Special Projects Corp. Top agencies USAF (Department of the Air Force)	$1,649,778	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
27	Ernst & Young LLP Top agencies EXIM (Export Import Bank of the US)	$1,643,000	0.4%	Rank history: not on the FY2021–FY2024 lists and #39 in FY2025; up 30 since Jul 2024–Jun 2025.
28	Fleming Gannett Inc Through GFT Infrastructure, Inc. Top agencies Army (Department of the Army)	$1,614,603	0.4%	Rank history: not on the FY2021–FY2023 lists, #46 in FY2024 and #24 in FY2025; up 5 since Jul 2024–Jun 2025.
29	Hydros Consulting Inc. Top agencies DOI (Department of the Interior)	$1,596,231	0.4%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; new, not ranked in Jul 2024–Jun 2025.
30	Nisga'a Mostt, LLC Top agencies Army (Department of the Army)	$1,584,849	0.4%	Rank history: not on the FY2021–FY2024 lists and #26 in FY2025; new, not ranked in Jul 2024–Jun 2025.
31	CAE USA Inc. Top agencies Army (Department of the Army) OSD (Office of the Secretary of Defense)	$1,478,965	0.4%	Rank history: not on the FY2021–FY2023 lists, #47 in FY2024 and #27 in FY2025; up 4 since Jul 2024–Jun 2025.
32	Boudreau Associates LLC Top agencies Army (Department of the Army)	$1,449,403	0.4%	Rank history: #41 in FY2021, #52 in FY2022, #52 in FY2023, #51 in FY2024 and #32 in FY2025; down 5 since Jul 2024–Jun 2025.
33	Purvis Systems Incorporated Top agencies Navy (Department of the Navy)	$1,322,013	0.3%	Rank history: not on the FY2021–FY2023 lists, #62 in FY2024 and #54 in FY2025; up 41 since Jul 2024–Jun 2025.
34	Heartland Federal Joint Venture LLC Top agencies Army (Department of the Army)	$1,321,291	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
35	LMI Consulting, LLC Top agencies HHS (Department of Health and Human Services)	$1,212,113	0.3%	Rank history: not on the FY2021–FY2023 lists, #35 in FY2024 and #34 in FY2025; up 12 since Jul 2024–Jun 2025.
36	Sierra Hydrographics Top agencies Army (Department of the Army)	$1,131,865	0.3%	Rank history: #95 in FY2021, #51 in FY2022, #43 in FY2023, #28 in FY2024 and #35 in FY2025; up 2 since Jul 2024–Jun 2025.
37	American Institutes for Research In the Behavioral Sciences Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation)	$1,122,951	0.3%	Rank history: #46 in FY2021, #43 in FY2022, #65 in FY2023, #60 in FY2024 and #40 in FY2025; up 21 since Jul 2024–Jun 2025.
38	Converge Federal Solutions JV, LLC Top agencies Army (Department of the Army)	$1,047,236	0.3%	Rank history: not on the FY2021–FY2024 lists and #30 in FY2025; up 44 since Jul 2024–Jun 2025.
39	First Environment Inc. Top agencies Army (Department of the Army)	$1,004,488	0.3%	Rank history: #24 in FY2021, #64 in FY2022, #81 in FY2023, #22 in FY2024 and #22 in FY2025; down 18 since Jul 2024–Jun 2025.
40	E.f. Kearney, Limited Through Kearney & Company, P.C. Top agencies MCC (Millennium Challenge Corporation)	$996,248	0.3%	Rank history: not on the FY2021–FY2024 lists and #57 in FY2025; up 164 since Jul 2024–Jun 2025.
41	National Academy of Sciences Top agencies DOE (Department of Energy) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$890,390	0.2%	Rank history: #6 in FY2021, #11 in FY2022, #12 in FY2023, #13 in FY2024 and not on the FY2025 list; down 29 since Jul 2024–Jun 2025.
42	JBS International, Inc. Top agencies DOL (Department of Labor)	$888,596	0.2%	Rank history: not on the FY2021–FY2023 lists, #71 in FY2024 and #14 in FY2025; down 20 since Jul 2024–Jun 2025.
43	Anthrotech Inc. Top agencies Navy (Department of the Navy)	$768,908	0.2%	Rank history: not on the FY2021–FY2022 lists, #55 in FY2023, #43 in FY2024 and #48 in FY2025; up 23 since Jul 2024–Jun 2025.
44	Competitive Solutions, Inc. Top agencies Army (Department of the Army)	$737,315	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
45	Parsons Corporation Through Parsons Government Services Inc. Top agencies Navy (Department of the Navy)	$721,228	0.2%	Rank history: #73 in FY2021, not on the FY2022 list, #80 in FY2023, #68 in FY2024 and #46 in FY2025; down 1 since Jul 2024–Jun 2025.
46	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, #19 in FY2024 and #43 in FY2025; down 26 since Jul 2024–Jun 2025.
47	Castro & Company, LLC Top agencies MCC (Millennium Challenge Corporation)	$656,496	0.2%	Rank history: not on the FY2021–FY2024 lists and #45 in FY2025; up 23 since Jul 2024–Jun 2025.
48	Virginia Commonwealth University Health System Authority 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, #70 in FY2024 and #47 in FY2025; up 19 since Jul 2024–Jun 2025.
49	Rational Futures Inc. Top agencies USAF (Department of the Air Force)	$568,835	0.1%	Rank history: not on the FY2021–FY2024 lists and #53 in FY2025; new, not ranked in Jul 2024–Jun 2025.
50	Sri International Top agencies NSF (National Science Foundation)	$568,567	0.1%	Rank history: #28 in FY2021, #62 in FY2022, not on the FY2023 list, #77 in FY2024 and #36 in FY2025; up 1 since Jul 2024–Jun 2025.
51	Whitney Strategic Services LLC Top agencies USAF (Department of the Air Force)	$550,000	0.1%	Rank history: not on the FY2021–FY2023 lists, #58 in FY2024 and #50 in FY2025; down 12 since Jul 2024–Jun 2025.
52	The Johns Hopkins University Applied Physics Laboratory LLC Top agencies NASA (National Aeronautics and Space Administration)	$500,000	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
53	BAE Systems Through BAE Systems Space & Mission Systems Inc. Top agencies Commerce (Department of Commerce)	$500,000	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
54	Southwest Research Institute Top agencies NASA (National Aeronautics and Space Administration)	$500,000	0.1%	Rank history: #88 in FY2021, not on the FY2022 list, #48 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
55	Regents of the University of Michigan Top agencies NASA (National Aeronautics and Space Administration)	$489,937	0.1%	Rank history: #63 in FY2021, #63 in FY2022, #31 in FY2023, #78 in FY2024 and not on the FY2025 list; up 20 since Jul 2024–Jun 2025.
56	Ignite Fueling Innovation Inc. Top agencies Army (Department of the Army)	$470,518	0.1%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2023, #30 in FY2024 and #25 in FY2025; down 16 since Jul 2024–Jun 2025.
57	Inpoint, Inc. Top agencies Treasury (Department of the Treasury)	$425,911	0.1%	Rank history: not on the FY2021–FY2023 lists, #45 in FY2024 and not on the FY2025 list; down 2 since Jul 2024–Jun 2025.
58	Bryce Space and Technology, LLC Top agencies USAF (Department of the Air Force)	$425,000	0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023, not on the FY2024 list and #42 in FY2025; up 13 since Jul 2024–Jun 2025.
59	Trustees of Boston University Top agencies VA (Department of Veterans Affairs)	$421,894	0.1%	Rank history: not on the FY2021 list, #85 in FY2022, #89 in FY2023, #85 in FY2024 and #59 in FY2025; up 25 since Jul 2024–Jun 2025.
60	The Peak Inc Top agencies USAF (Department of the Air Force)	$419,568	0.1%	Rank history: not on the FY2021–FY2023 lists, #99 in FY2024 and #60 in FY2025; up 4 since Jul 2024–Jun 2025.
61	M3 Works LLC Top agencies USDA (Department of Agriculture)	$418,000	0.1%	Rank history: not on the FY2021–FY2023 lists, #93 in FY2024 and #58 in FY2025; up 26 since Jul 2024–Jun 2025.
62	OMP Inc. Top agencies NASA (National Aeronautics and Space Administration)	$376,700	0.1%	Rank history: not on the FY2021–FY2024 lists and #74 in FY2025; up 55 since Jul 2024–Jun 2025.
63	Compagnie Maritime D'expertises Top agencies NASA (National Aeronautics and Space Administration)	$346,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #73 in FY2025; new, not ranked in Jul 2024–Jun 2025.
64	BCT Partners LLC Top agencies DOJ (Department of Justice)	$330,329	0.1%	Rank history: #44 in FY2021, #84 in FY2022, not on the FY2023–FY2024 lists and #61 in FY2025; up 26 since Jul 2024–Jun 2025.
65	Okinawa Environmental Analysis Center Co. Ltd. Top agencies Army (Department of the Army)	$316,102	0.1%	Rank history: not on the FY2021–FY2024 lists and #93 in FY2025; up 72 since Jul 2024–Jun 2025.
66	Thermo Fisher Scientific Inc. Through Life Technologies Corporation Top agencies DHS (Department of Homeland Security)	$311,305	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
67	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, #92 in FY2024 and #63 in FY2025; up 19 since Jul 2024–Jun 2025.
68	S&P Global Market Intelligence LLC Top agencies SBA (Small Business Administration) PBGC (Pension Benefit Guaranty Corporation)	$302,463	0.1%	Rank history: not on the FY2021–FY2024 lists and #64 in FY2025; up 26 since Jul 2024–Jun 2025.
69	SGS Korea Co.,Ltd Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$301,715	0.1%	Rank history: not on the FY2021–FY2023 lists, #98 in FY2024 and #83 in FY2025; up 113 since Jul 2024–Jun 2025.
70	Fedsight-Jpi JV LLC Top agencies EPA (Environmental Protection Agency)	$301,710	0.1%	Rank history: not on the FY2021–FY2024 lists and #80 in FY2025; up 42 since Jul 2024–Jun 2025.
71	Virginia Commercial Space Flight Authority Top agencies NASA (National Aeronautics and Space Administration)	$300,819	0.1%	Rank history: not on the FY2021–FY2023 lists, #75 in FY2024 and #44 in FY2025; down 12 since Jul 2024–Jun 2025.
72	Spider Strategies, Inc. Top agencies Army (Department of the Army)	$296,122	0.1%	Rank history: not on the FY2021–FY2024 lists and #66 in FY2025; up 25 since Jul 2024–Jun 2025.
73	Dj&A, P.C. Top agencies DOI (Department of the Interior)	$293,862	0.1%	Rank history: not on the FY2021–FY2024 lists and #65 in FY2025; new, not ranked in Jul 2024–Jun 2025.
74	Cultural Resource Analysts, Inc. Top agencies USDA (Department of Agriculture)	$287,020	0.1%	Rank history: not on the FY2021–FY2023 lists, #80 in FY2024 and #56 in FY2025; down 11 since Jul 2024–Jun 2025.
75	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, #64 in FY2024 and #67 in FY2025; down 14 since Jul 2024–Jun 2025.
76	Gulf South Research Corp Top agencies Army (Department of the Army)	$276,727	0.1%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023, #87 in FY2024 and not on the FY2025 list; up 54 since Jul 2024–Jun 2025.
77	LWH Enterprises Inc Top agencies HHS (Department of Health and Human Services)	$275,443	0.1%	Rank history: not on the FY2021–FY2024 lists and #68 in FY2025; up 23 since Jul 2024–Jun 2025.
78	Florida Department of Health Top agencies DHS (Department of Homeland Security)	$270,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #69 in FY2025; up 15 since Jul 2024–Jun 2025.
79	Karina FG Esposito Top agencies WHS (DOD Washington Headquarters Service)	$252,117	0.1%	Rank history: not on the FY2021–FY2024 lists and #100 in FY2025; new, not ranked in Jul 2024–Jun 2025.
80	Schultz, Timothy A Top agencies WHS (DOD Washington Headquarters Service)	$252,117	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
81	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 and #72 in FY2025; new, not ranked in Jul 2024–Jun 2025.
82	Chugai Technos Corporation Top agencies Army (Department of the Army)	$247,564	0.1%	Rank history: not on the FY2021–FY2024 lists and #70 in FY2025; up 32 since Jul 2024–Jun 2025.
83	Bolton Partners, Inc. Top agencies PBGC (Pension Benefit Guaranty Corporation)	$245,975	0.1%	Rank history: not on the FY2021–FY2024 lists and #76 in FY2025; up 26 since Jul 2024–Jun 2025.
84	Vannevar Labs, Inc. Top agencies DOS (Department of State)	$245,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; new, not ranked in Jul 2024–Jun 2025.
85	Odyssey Space, LLC Top agencies NASA (National Aeronautics and Space Administration)	$240,000	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
86	NEZ Perce Tribe Top agencies Army (Department of the Army)	$236,709	0.1%	Rank history: not on the FY2021–FY2024 lists and #86 in FY2025; up 15 since Jul 2024–Jun 2025.
87	Cornerstone Environmental Consulting LLC Top agencies DOI (Department of the Interior)	$234,887	0.1%	Rank history: not on the FY2021–FY2025 lists; up 153 since Jul 2024–Jun 2025.
88	Cherokee Nation Red Wing, L.L.C. 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 and #79 in FY2025; new, not ranked in Jul 2024–Jun 2025.
89	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 and #81 in FY2025; up 24 since Jul 2024–Jun 2025.
90	Athena Consulting LLC Top agencies PBGC (Pension Benefit Guaranty Corporation)	$223,000	0.1%	Rank history: not on the FY2021–FY2023 lists, #90 in FY2024 and #82 in FY2025; down 7 since Jul 2024–Jun 2025.
91	AON Consulting, Inc. Top agencies DOJ (Department of Justice)	$211,450	0.1%	Rank history: not on the FY2021–FY2024 lists and #85 in FY2025; up 29 since Jul 2024–Jun 2025.
92	H-Plus ECO Ltd. Top agencies Army (Department of the Army)	$210,494	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023, not on the FY2024 list and #84 in FY2025; down 15 since Jul 2024–Jun 2025.
93	Colorado State University Top agencies Army (Department of the Army)	$195,677	0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; up 50 since Jul 2024–Jun 2025.
94	Cooper Zietz Engineers, Inc. Top agencies HHS (Department of Health and Human Services)	$195,165	0.1%	Rank history: #21 in FY2021, #23 in FY2022, #10 in FY2023, #18 in FY2024 and #62 in FY2025; down 80 since Jul 2024–Jun 2025.
95	Lexisnexis Special Services Inc 2 awardees, including Relx Inc. Top agencies Treasury (Department of the Treasury) Navy (Department of the Navy)	$155,950	<0.1%	Rank history: not on the FY2021–FY2024 lists and #91 in FY2025; up 112 since Jul 2024–Jun 2025.
96	Confederated Tribes of Colville Reservation Top agencies Army (Department of the Army)	$154,549	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
97	Wake Forest University Health Sciences Top agencies DOT (Department of Transportation)	$150,970	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 87 since Jul 2024–Jun 2025.
98	Othram Inc. Top agencies Navy (Department of the Navy)	$148,867	<0.1%	Rank history: not on the FY2021–FY2024 lists and #95 in FY2025; new, not ranked in Jul 2024–Jun 2025.
99	FI Consulting, Inc. Top agencies Treasury (Department of the Treasury)	$141,050	<0.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023, #50 in FY2024 and #33 in FY2025; down 50 since Jul 2024–Jun 2025.
100	Navanti Group LLC Top agencies DLA (Defense Logistics Agency)	$119,000	<0.1%	Rank history: not on the FY2021 list, #90 in FY2022, #74 in FY2023, not on the FY2024 list and #90 in FY2025; down 11 since Jul 2024–Jun 2025.

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100 of 239 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 $388 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.
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 B599 contractors in Jul 2025–Jun 2026?

1. Research Triangle Institute ($55.5M), 2. Booz Allen Hamilton Holding Corporation ($54.8M), 3. The Rand Corporation ($47.3M), 4. American Institute In Taiwan ($38.9M), 5. Fors Marsh Group LLC ($20.7M), 6. The Boeing Company ($12.4M), 7. Tanaq Management Services LLC ($12.2M), 8. Janus Research Group, LLC ($10.1M), 9. Group W Inc. ($9.22M), 10. Lockheed Martin Corporation ($8.16M).

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