Top 100 Contractors in PSC B: Special Studies/Analysis, Not R&D, FY2024

Name: Top 100 Contractors in PSC B: Special Studies/Analysis, Not R&D, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 38% of FY2024 PSC B contract dollars

Contract obligations: $3,129,218,269 Net of deobligations, by contracts coded PSC B or a code under it
Contractors: 2,367 Parent companies with an obligation
Largest contractor: Institute for Defense Analyses $216 million, 6.6% 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	Institute for Defense Analyses Top agencies OSD (Office of the Secretary of Defense) WHS (DOD Washington Headquarters Service) EOP (Executive Office of the President)	$216,257,693	6.6%	Rank history: #3 in FY2021, #2 in FY2022, #2 in FY2023 and not on the FY2025 list; up 1 since FY2023.
2	The Rand Corporation Top agencies OSD (Office of the Secretary of Defense) DHS (Department of Homeland Security) Army (Department of the Army)	$208,377,227	6.4%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #5 in FY2025; down 1 since FY2023.
3	The Johns Hopkins University Applied Physics Laboratory LLC Top agencies OSD (Office of the Secretary of Defense) USAF (Department of the Air Force) DTRA (Defense Threat Reduction Agency)	$162,533,344	5.0%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
4	Parsons Corporation Through Parsons Government Services Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOI (Department of the Interior)	$144,585,708	4.4%	Rank history: not on the FY2021–FY2022 lists, #8 in FY2023 and #2 in FY2025; up 4 since FY2023.
5	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) ED (Department of Education) NSF (National Science Foundation)	$118,317,921	3.6%	Rank history: #6 in FY2021, #4 in FY2022, #5 in FY2023 and #9 in FY2025; unchanged since FY2023.
6	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) Army (Department of the Army)	$105,192,638	3.2%	Rank history: #4 in FY2021, #3 in FY2022, #4 in FY2023 and #8 in FY2025; down 2 since FY2023.
7	The CNA Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) Army (Department of the Army)	$102,465,503	3.1%	Rank history: #5 in FY2021, #6 in FY2022, #6 in FY2023 and #7 in FY2025; down 1 since FY2023.
8	Deloitte 3 awardees, including Deloitte Consulting LLP and Deloitte & Touche LLP Top agencies Treasury (Department of the Treasury) PBGC (Pension Benefit Guaranty Corporation) HHS (Department of Health and Human Services)	$63,093,333	1.9%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2025; new.
9	Educational Testing Service Top agencies ED (Department of Education)	$62,577,904	1.9%	Rank history: #7 in FY2021, #7 in FY2022, #7 in FY2023 and #10 in FY2025; down 2 since FY2023.
10	Mathematica Inc. 2 awardees Top agencies USDA (Department of Agriculture) SSA (Social Security Administration) DOL (Department of Labor)	$59,512,290	1.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
11	Westat, Inc. 2 awardees Top agencies USDA (Department of Agriculture) ED (Department of Education) HHS (Department of Health and Human Services)	$51,772,945	1.6%	Rank history: #15 in FY2021, #22 in FY2022, #16 in FY2023 and #17 in FY2025; up 5 since FY2023.
12	Unwin Co Top agencies DOE (Department of Energy)	$42,405,024	1.3%	Rank history: #14 in FY2021, #11 in FY2022, #11 in FY2023 and #14 in FY2025; down 1 since FY2023.
13	Harvard Pilgrim Health Care, Inc. 2 awardees Top agencies HHS (Department of Health and Human Services)	$35,805,908	1.1%	Rank history: #11 in FY2021, #13 in FY2022, #12 in FY2023 and #19 in FY2025; down 1 since FY2023.
14	Johnson Controls Security Solutions LLC Through Johnson Controls Government Systems, LLC Top agencies GSA (General Services Administration) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$34,116,620	1.0%	Rank history: #62 in FY2021, #16 in FY2022, #34 in FY2023 and not on the FY2025 list; up 20 since FY2023.
15	The Mitre Corporation Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) EOP (Executive Office of the President)	$30,284,924	0.9%	Rank history: not on the FY2021–FY2023 lists and #40 in FY2025; new.
16	Minatoishi Palumbo Architects, Inc. Top agencies Army (Department of the Army)	$28,712,217	0.9%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
17	Gartner, Inc. 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$27,974,103	0.9%	Rank history: #27 in FY2021, #27 in FY2022, #25 in FY2023 and #60 in FY2025; up 8 since FY2023.
18	BAE Systems 2 awardees, including BAE Systems Technology Solutions & Services Inc. Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$27,633,935	0.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
19	Ginkgo Bioworks Holdings Inc. 2 awardees, including Ginkgo Bioworks, Inc. Top agencies HHS (Department of Health and Human Services)	$26,746,521	0.8%	Rank history: not on the FY2021 list, #34 in FY2022, #29 in FY2023 and not on the FY2025 list; up 10 since FY2023.
20	Lockheed Martin Corporation 4 awardees Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$26,522,662	0.8%	Rank history: #26 in FY2021, #14 in FY2022, #31 in FY2023 and #31 in FY2025; up 11 since FY2023.
21	Ameresco Inc. 2 awardees, including Ameresco Federal Solutions, Inc. Top agencies USAF (Department of the Air Force) GSA (General Services Administration) DOI (Department of the Interior)	$26,406,077	0.8%	Rank history: #12 in FY2021, #20 in FY2022, #10 in FY2023 and #1 in FY2025; down 11 since FY2023.
22	Iqvia Government Solutions Inc Top agencies HHS (Department of Health and Human Services)	$24,937,798	0.8%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2025; up 461 since FY2023.
23	Kemron Environmental Services Inc. Top agencies Army (Department of the Army)	$22,358,851	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
24	Empower AI, Inc. Top agencies HHS (Department of Health and Human Services)	$22,116,556	0.7%	Rank history: not on the FY2021–FY2023 lists and #21 in FY2025; new.
25	The Broad Institute, Inc. Top agencies HHS (Department of Health and Human Services)	$21,215,888	0.7%	Rank history: #22 in FY2021, #35 in FY2022, not on the FY2023 list and not on the FY2025 list; up 81 since FY2023.
26	Schneider Electric Buildings Americas Inc. Top agencies USAF (Department of the Air Force)	$21,184,111	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 220 since FY2023.
27	Guidehouse Inc. 4 awardees, including Aptim Federal Services, LLC and Peraton Technology Services Inc. Top agencies VA (Department of Veterans Affairs) HUD (Department of Housing and Urban Development) DOI (Department of the Interior)	$20,971,479	0.6%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2025; new.
28	ASR Analytics, LLC Top agencies Treasury (Department of the Treasury)	$20,921,259	0.6%	Rank history: #35 in FY2021, #41 in FY2022, #39 in FY2023 and #33 in FY2025; up 11 since FY2023.
29	RMC 2021 LLC Top agencies Navy (Department of the Navy)	$20,672,157	0.6%	Rank history: #39 in FY2021, #15 in FY2022, #20 in FY2023 and #22 in FY2025; down 9 since FY2023.
30	Applied Enterprise Management Corporation Top agencies ED (Department of Education)	$19,122,561	0.6%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and #74 in FY2025; up 62 since FY2023.
31	National Academy of Sciences Top agencies DOE (Department of Energy) HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$18,327,678	0.6%	Rank history: #20 in FY2021, #24 in FY2022, #28 in FY2023 and #53 in FY2025; down 3 since FY2023.
32	Tetra Tech, Inc. 9 awardees, including RPS Group, Inc. and Tetra TECH International Inc. Zweigniederlassung Deutschland Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOI (Department of the Interior)	$17,675,846	0.5%	Rank history: #42 in FY2021, #30 in FY2022, #27 in FY2023 and #20 in FY2025; down 5 since FY2023.
33	General Dynamics Corporation 7 awardees, including General Dynamics Information Technology, Inc., General Dynamics Mission Systems, Inc. and General Dynamics-Ots, Inc. Top agencies HHS (Department of Health and Human Services) ED (Department of Education) USAF (Department of the Air Force)	$17,463,535	0.5%	Rank history: #74 in FY2021, #40 in FY2022, #22 in FY2023 and #44 in FY2025; down 11 since FY2023.
34	Baylor College of Medicine Top agencies HHS (Department of Health and Human Services)	$16,736,069	0.5%	Rank history: #57 in FY2021, #49 in FY2022, #38 in FY2023 and #57 in FY2025; up 4 since FY2023.
35	The Boeing Company 7 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$15,641,950	0.5%	Rank history: #31 in FY2021, #32 in FY2022, #56 in FY2023 and not on the FY2025 list; up 21 since FY2023.
36	Janus Research Group, LLC Top agencies Army (Department of the Army)	$15,208,165	0.5%	Rank history: #24 in FY2021, #19 in FY2022, #26 in FY2023 and #36 in FY2025; down 10 since FY2023.
37	Fors Marsh Group LLC Top agencies DHRA (Defense Human Resources Activity) HHS (Department of Health and Human Services)	$15,192,454	0.5%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2025; new.
38	National Opinion Research Center Top agencies NSF (National Science Foundation) DHRA (Defense Human Resources Activity) HHS (Department of Health and Human Services)	$14,545,148	0.4%	Rank history: not on the FY2021 list, #50 in FY2022, #40 in FY2023 and #47 in FY2025; up 2 since FY2023.
39	Hdr, Inc. 2 awardees, including HDR Environmental, Operations and Construction, Inc. and HDR Engineering Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$14,360,782	0.4%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2025; up 128 since FY2023.
40	Semanticbits LLC 2 awardees, including ICF Incorporated, L.L.C. and Incentive Technology Group LLC Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation) HHS (Department of Health and Human Services)	$14,106,351	0.4%	Rank history: not on the FY2021–FY2023 lists and #50 in FY2025; new.
41	Cherokee Insights LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$13,743,845	0.4%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2023 and #61 in FY2025; up 5 since FY2023.
42	AECOM Technical Services, Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) DOT (Department of Transportation)	$12,905,087	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
43	Mckinsey & Company, Inc. Through Mckinsey & Company, Inc. Washington D.c. Top agencies USAF (Department of the Air Force) HUD (Department of Housing and Urban Development)	$12,077,887	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 181 since FY2023.
44	RTX Corporation 2 awardees, including Everfox LLC and Noresco, LLC Top agencies USAF (Department of the Air Force) DOE (Department of Energy) Treasury (Department of the Treasury)	$11,591,053	0.4%	Rank history: #36 in FY2021, #44 in FY2022, #21 in FY2023 and not on the FY2025 list; down 23 since FY2023.
45	Mid Atlantic Technical and Executive Consulting, LLC Top agencies Navy (Department of the Navy)	$11,287,426	0.3%	Rank history: #95 in FY2021, #68 in FY2022, #51 in FY2023 and #75 in FY2025; up 6 since FY2023.
46	Acumen LLC Top agencies HHS (Department of Health and Human Services)	$10,721,221	0.3%	Rank history: #32 in FY2021, #39 in FY2022, #43 in FY2023 and #73 in FY2025; down 3 since FY2023.
47	Goldbelt C6, LLC Top agencies HHS (Department of Health and Human Services) DOS (Department of State)	$10,170,218	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
48	American Institutes for Research In the Behavioral Sciences Top agencies ED (Department of Education) HHS (Department of Health and Human Services)	$9,996,244	0.3%	Rank history: #40 in FY2021, #37 in FY2022, #67 in FY2023 and not on the FY2025 list; up 19 since FY2023.
49	Technomics Inc. Top agencies DOE (Department of Energy)	$9,701,522	0.3%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; new.
50	Tellus Civic Science Corporation Top agencies Commerce (Department of Commerce)	$9,419,785	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
51	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) HHS (Department of Health and Human Services)	$8,980,867	0.3%	Rank history: #46 in FY2021, #52 in FY2022, #83 in FY2023 and #46 in FY2025; up 32 since FY2023.
52	Applied Research Associates, Inc. 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$8,960,086	0.3%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2023 and not on the FY2025 list; down 11 since FY2023.
53	Excella, LLC Top agencies OPM (Office of Personnel Management)	$8,710,344	0.3%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2025; new.
54	Analytic Services Inc. 2 awardees, including Advanced Technology International Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$8,604,820	0.3%	Rank history: #99 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
55	Mipps, LLC Top agencies DHA (Defense Health Agency)	$8,567,794	0.3%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and #45 in FY2025; up 9 since FY2023.
56	Dexis Interactive Incorporated Top agencies USAID (US Agency for International Development)	$8,292,168	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
57	The Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies OSD (Office of the Secretary of Defense) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$7,939,453	0.2%	Rank history: #2 in FY2021, #5 in FY2022, #3 in FY2023 and not on the FY2025 list; down 54 since FY2023.
58	Emory University Top agencies HHS (Department of Health and Human Services)	$7,905,296	0.2%	Rank history: not on the FY2021 list, #46 in FY2022, #9 in FY2023 and #34 in FY2025; down 49 since FY2023.
59	Afognak Native Corporation Through Shields Point LLC Top agencies DOJ (Department of Justice)	$7,852,309	0.2%	Rank history: #52 in FY2021, #53 in FY2022, #59 in FY2023 and not on the FY2025 list; unchanged since FY2023.
60	New South Associates, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior) GSA (General Services Administration)	$7,742,449	0.2%	Rank history: #51 in FY2021, #59 in FY2022, #70 in FY2023 and #43 in FY2025; up 10 since FY2023.
61	Group W Inc. Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service)	$7,669,909	0.2%	Rank history: #69 in FY2021, #93 in FY2022, not on the FY2023 list and #63 in FY2025; up 110 since FY2023.
62	ICF International, Inc. 2 awardees, including ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture) DOI (Department of the Interior)	$7,383,667	0.2%	Rank history: #17 in FY2021, #21 in FY2022, #23 in FY2023 and not on the FY2025 list; down 39 since FY2023.
63	UnitedHealth Group Incorporated 2 awardees, including The Lewin Group, Inc. and Optuminsight Life Sciences Inc. Top agencies HHS (Department of Health and Human Services)	$7,357,307	0.2%	Rank history: #19 in FY2021, #42 in FY2022, #55 in FY2023 and not on the FY2025 list; down 8 since FY2023.
64	Hart Technologies, Inc. Top agencies Navy (Department of the Navy)	$7,025,105	0.2%	Rank history: #55 in FY2021, not on the FY2022 list, #94 in FY2023 and #56 in FY2025; up 30 since FY2023.
65	SES Construction and Fuel Services LLC Through Bristol Environmental Solutions LLC Top agencies Army (Department of the Army)	$6,838,307	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
66	Groundswell Corporation Top agencies DOT (Department of Transportation)	$6,798,871	0.2%	Rank history: not on the FY2021 list, #92 in FY2022, not on the FY2023 list and #82 in FY2025; returned.
67	Information Management Services, Inc. Top agencies HHS (Department of Health and Human Services)	$6,611,063	0.2%	Rank history: #68 in FY2021, #64 in FY2022, #57 in FY2023 and #78 in FY2025; down 10 since FY2023.
68	Kpmg LLP Top agencies DOL (Department of Labor) DOT (Department of Transportation)	$6,399,913	0.2%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2025; new.
69	Tridec Technologies, LLC Top agencies Commerce (Department of Commerce)	$6,287,619	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
70	State of California Controllers Office 8 awardees, including University of California, Davis, State of California Department of Water Resources and University of California, San Diego Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$6,222,159	0.2%	Rank history: #41 in FY2021, #55 in FY2022, #52 in FY2023 and not on the FY2025 list; down 18 since FY2023.
71	Far Western Anthropological Research Group, Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$6,005,131	0.2%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and not on the FY2025 list; up 15 since FY2023.
72	Tanaq Management Services LLC Top agencies HHS (Department of Health and Human Services)	$5,983,659	0.2%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023 and #67 in FY2025; up 9 since FY2023.
73	Dynamic-Pro Inc. Top agencies Treasury (Department of the Treasury)	$5,983,475	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 105 since FY2023.
74	The Clark Group. Llc Top agencies USDA (Department of Agriculture) DOJ (Department of Justice)	$5,961,051	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 126 since FY2023.
75	Tecolote Research, Inc. Top agencies OSD (Office of the Secretary of Defense)	$5,922,519	0.2%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023 and #39 in FY2025; down 13 since FY2023.
76	Netcentric Technology, LLC Top agencies Commerce (Department of Commerce)	$5,920,580	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
77	The Medical College of Wisconsin, Inc. Top agencies HHS (Department of Health and Human Services)	$5,913,595	0.2%	Rank history: #78 in FY2021, #61 in FY2022, #77 in FY2023 and #66 in FY2025; unchanged since FY2023.
78	Universal Technical Resource Services Inc. Top agencies USAF (Department of the Air Force)	$5,817,412	0.2%	Rank history: not on the FY2021 list, #84 in FY2022, #82 in FY2023 and #65 in FY2025; up 4 since FY2023.
79	Jacobs Government Services Company Through Jacobs Engineering Group Inc. Top agencies Army (Department of the Army)	$5,645,900	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2025; new.
80	S.P. Cramer & Associates, Inc. Top agencies Army (Department of the Army) Commerce (Department of Commerce)	$5,606,257	0.2%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2023 and #72 in FY2025; down 30 since FY2023.
81	MRIGLOBAL Top agencies DOD (Department of Defense) HHS (Department of Health and Human Services)	$5,582,256	0.2%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2023 and #79 in FY2025; up 8 since FY2023.
82	AECOM 5 awardees, including Environmental Management & Planning Solutions LLC, AECOM Italia S.P.A. and AECOM Services, LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$5,458,114	0.2%	Rank history: not on the FY2021 list, #31 in FY2022, #37 in FY2023 and not on the FY2025 list; down 45 since FY2023.
83	Honeywell International Inc. Top agencies USAF (Department of the Air Force) GSA (General Services Administration) NASA (National Aeronautics and Space Administration)	$5,412,844	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
84	Cooper Zietz Engineers, Inc. Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services)	$5,306,107	0.2%	Rank history: #87 in FY2021, #69 in FY2022, #60 in FY2023 and not on the FY2025 list; down 24 since FY2023.
85	MEF Associates, LLC Top agencies USDA (Department of Agriculture)	$5,079,842	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	Tatitlek Federal Services LLC Top agencies DOS (Department of State)	$5,025,664	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
87	University of Washington Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) Commerce (Department of Commerce)	$5,020,884	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
88	New York Genome Center, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$4,961,322	0.2%	Rank history: #70 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 309 since FY2023.
89	Cliftonlarsonallen LLP Top agencies HUD (Department of Housing and Urban Development)	$4,919,733	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
90	Leidos, Inc. Top agencies HUD (Department of Housing and Urban Development)	$4,882,069	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
91	First Environment Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$4,725,807	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 251 since FY2023.
92	Sag Corporation Top agencies VA (Department of Veterans Affairs)	$4,723,303	0.1%	Rank history: #83 in FY2021, #95 in FY2022, not on the FY2023 list and not on the FY2025 list; up 13 since FY2023.
93	Knowesis, Inc. Top agencies DHS (Department of Homeland Security)	$4,704,340	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 9 since FY2023.
94	FI Consulting, Inc. Top agencies HUD (Department of Housing and Urban Development) Treasury (Department of the Treasury)	$4,699,555	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 144 since FY2023.
95	Bureau Van Dijk Electronic Publishing Inc. 2 awardees, including Moody's Analytics, Inc. Top agencies Treasury (Department of the Treasury) HUD (Department of Housing and Urban Development) CFPB (Consumer Financial Protection Bureau)	$4,622,880	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 17 since FY2023.
96	Scientific Research Corporation Top agencies OSD (Office of the Secretary of Defense)	$4,604,656	0.1%	Rank history: #44 in FY2021, not on the FY2022 list, #78 in FY2023 and not on the FY2025 list; down 18 since FY2023.
97	Gryphon Technologies, Inc. Through Gryphon Technologies, L.C. Top agencies USAF (Department of the Air Force)	$4,513,786	0.1%	Rank history: #85 in FY2021, #97 in FY2022, not on the FY2023 list and not on the FY2025 list; up 142 since FY2023.
98	Asco Power Services Inc Through Schneider Electric Buildings Americas, Inc. Top agencies USAF (Department of the Air Force) GSA (General Services Administration)	$4,457,239	0.1%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2025; new.
99	Olgoonik Solutions LLC Top agencies DOS (Department of State)	$4,395,162	0.1%	Rank history: not on the FY2021–FY2023 lists and #38 in FY2025; new.
100	Otak, Inc. Top agencies DOI (Department of the Interior)	$4,365,510	0.1%	Rank history: #75 in FY2021, not on the FY2022 list, #73 in FY2023 and not on the FY2025 list; down 27 since FY2023.

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100 of 2,367 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC B

Code	Net obligations	Largest contractor
B5 Special Studies – Not R&D	$3,129,218,269	Institute for Defense Analyses

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 $3.26 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.
Fiscal year 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 B contractors in FY2024?

1. Institute for Defense Analyses ($216M), 2. The Rand Corporation ($208M), 3. The Johns Hopkins University Applied Physics Laboratory LLC ($163M), 4. Parsons Corporation ($145M), 5. Research Triangle Institute ($118M), 6. Booz Allen Hamilton Holding Corporation ($105M), 7. The CNA Corporation ($102M), 8. Deloitte ($63.1M), 9. Educational Testing Service ($62.6M), 10. Mathematica Inc. ($59.5M).

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