Top 100 Contractors in PSC B5: Special Studies – Not R&D, FY2023

Name: Top 100 Contractors in PSC B5: Special Studies – Not R&D, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 37% of FY2023 PSC B5 contract dollars

Contract obligations: $3,114,201,020 Net of deobligations, by contracts coded PSC B5 or a code under it
Contractors: 2,310 Parent companies with an obligation
Largest contractor: The Rand Corporation $251 million, 7.7% 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	The Rand Corporation Top agencies DHS (Department of Homeland Security) OSD (Office of the Secretary of Defense) USAF (Department of the Air Force)	$250,518,429	7.7%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2024 and #5 in FY2025; unchanged since FY2022.
2	Institute for Defense Analyses Top agencies OSD (Office of the Secretary of Defense) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$219,899,459	6.7%	Rank history: #3 in FY2021, #2 in FY2022, #1 in FY2024 and not on the FY2025 list; unchanged since FY2022.
3	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) SSA (Social Security Administration)	$177,161,456	5.4%	Rank history: #2 in FY2021, #5 in FY2022, #57 in FY2024 and not on the FY2025 list; up 2 since FY2022.
4	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) Treasury (Department of the Treasury)	$133,483,632	4.1%	Rank history: #4 in FY2021, #3 in FY2022, #6 in FY2024 and #8 in FY2025; down 1 since FY2022.
5	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) ED (Department of Education) NSF (National Science Foundation)	$127,872,563	3.9%	Rank history: #6 in FY2021, #4 in FY2022, #5 in FY2024 and #9 in FY2025; down 1 since FY2022.
6	The CNA Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) OSD (Office of the Secretary of Defense)	$98,150,388	3.0%	Rank history: #5 in FY2021, #6 in FY2022, #7 in FY2024 and #7 in FY2025; unchanged since FY2022.
7	Educational Testing Service Top agencies ED (Department of Education)	$66,606,295	2.0%	Rank history: #7 in FY2021, #7 in FY2022, #9 in FY2024 and #10 in FY2025; unchanged since FY2022.
8	Parsons Corporation Through Parsons Government Services Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$52,221,789	1.6%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2024 and #2 in FY2025; new.
9	Emory University Top agencies HHS (Department of Health and Human Services) DOT (Department of Transportation)	$51,409,767	1.6%	Rank history: not on the FY2021 list, #46 in FY2022, #58 in FY2024 and #34 in FY2025; up 37 since FY2022.
10	Ameresco Inc. 2 awardees, including Ameresco Federal Solutions, Inc. Top agencies GSA (General Services Administration) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$45,858,537	1.4%	Rank history: #12 in FY2021, #20 in FY2022, #21 in FY2024 and #1 in FY2025; up 10 since FY2022.
11	Unwin Co Top agencies DOE (Department of Energy)	$40,191,082	1.2%	Rank history: #14 in FY2021, #11 in FY2022, #12 in FY2024 and #14 in FY2025; unchanged since FY2022.
12	Harvard Pilgrim Health Care Inc Top agencies HHS (Department of Health and Human Services)	$39,272,974	1.2%	Rank history: #11 in FY2021, #13 in FY2022, #13 in FY2024 and #19 in FY2025; up 1 since FY2022.
13	The Mitre Corporation Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) DOT (Department of Transportation)	$38,193,037	1.2%	Rank history: #25 in FY2021, #18 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
14	Deloitte Consulting LLP Top agencies Treasury (Department of the Treasury) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$34,898,951	1.1%	Rank history: not on the FY2021 list, #8 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
15	BAE Systems PLC Through BAE Systems Technology Solutions & Services Inc. Top agencies Army (Department of the Army)	$34,874,186	1.1%	Rank history: #10 in FY2021, #9 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
16	Westat, Inc. Top agencies ED (Department of Education) USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$32,724,572	1.0%	Rank history: #15 in FY2021, #22 in FY2022, #11 in FY2024 and #17 in FY2025; up 6 since FY2022.
17	Guidehouse Inc. 2 awardees Top agencies VA (Department of Veterans Affairs) HUD (Department of Housing and Urban Development) Treasury (Department of the Treasury)	$30,073,008	0.9%	Rank history: #13 in FY2021, #10 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
18	Deloitte LLP 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)	$28,430,151	0.9%	Rank history: #9 in FY2021, #12 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
19	Mathematica Inc 2 awardees Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services) SSA (Social Security Administration)	$28,081,483	0.9%	Rank history: #80 in FY2021, #26 in FY2022 and not on the FY2024–FY2025 lists; up 7 since FY2022.
20	RMC 2021 LLC Top agencies Navy (Department of the Navy)	$27,769,232	0.9%	Rank history: #39 in FY2021, #15 in FY2022, #29 in FY2024 and #22 in FY2025; down 5 since FY2022.
21	RTX Corporation 5 awardees, including Noresco, LLC, Everfox LLC and Raytheon Company Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$26,556,042	0.8%	Rank history: #36 in FY2021, #44 in FY2022, #44 in FY2024 and not on the FY2025 list; up 23 since FY2022.
22	General Dynamics Corporation 4 awardees, including General Dynamics Information Technology, Inc., General Dynamics Mission Systems, Inc. and General Dynamics-Ots, Inc. Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) ED (Department of Education)	$23,532,194	0.7%	Rank history: #74 in FY2021, #40 in FY2022, #33 in FY2024 and #44 in FY2025; up 18 since FY2022.
23	ICF International, Inc. 2 awardees, including ICF Incorporated, L.L.C. and ICF Macro Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) CPSC (Consumer Product Safety Commission)	$23,420,506	0.7%	Rank history: #17 in FY2021, #21 in FY2022, #62 in FY2024 and not on the FY2025 list; down 2 since FY2022.
24	H.i.g. Capital Management Inc. Through Empower AI, Inc. Top agencies HHS (Department of Health and Human Services)	$22,854,322	0.7%	Rank history: #18 in FY2021, #23 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
25	Gartner, Inc. 2 awardees, including Personnel Decisions Research Institutes, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$22,592,231	0.7%	Rank history: #27 in FY2021, #27 in FY2022, #17 in FY2024 and #60 in FY2025; up 2 since FY2022.
26	Janus Research Group, LLC Top agencies Army (Department of the Army)	$22,366,567	0.7%	Rank history: #24 in FY2021, #19 in FY2022, #36 in FY2024 and #36 in FY2025; down 7 since FY2022.
27	Tetra Tech, Inc. 8 awardees, including Tetra TECH International Inc. Zweigniederlassung Deutschland and Segue Technologies, Inc. Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security) CPSC (Consumer Product Safety Commission)	$22,079,071	0.7%	Rank history: #42 in FY2021, #30 in FY2022, #32 in FY2024 and #20 in FY2025; up 3 since FY2022.
28	National Academy of Sciences Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation) NASA (National Aeronautics and Space Administration)	$21,918,853	0.7%	Rank history: #20 in FY2021, #24 in FY2022, #31 in FY2024 and #53 in FY2025; down 4 since FY2022.
29	Ginkgo Bioworks Holdings Inc. Through Ginkgo Bioworks, Inc. Top agencies HHS (Department of Health and Human Services)	$19,825,272	0.6%	Rank history: not on the FY2021 list, #34 in FY2022, #19 in FY2024 and not on the FY2025 list; up 5 since FY2022.
30	Iqvia Inc. 2 awardees, including Iqvia Government Solutions Inc. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$19,621,803	0.6%	Rank history: #37 in FY2021, #28 in FY2022 and not on the FY2024–FY2025 lists; down 2 since FY2022.
31	Lockheed Martin Corporation 4 awardees Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) Navy (Department of the Navy)	$16,830,274	0.5%	Rank history: #26 in FY2021, #14 in FY2022, #20 in FY2024 and #31 in FY2025; down 17 since FY2022.
32	Environmental Management & Planning Solutions LLC 2 awardees Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$16,763,036	0.5%	Rank history: #64 in FY2021, #43 in FY2022 and not on the FY2024–FY2025 lists; up 11 since FY2022.
33	Riva Solutions Inc Top agencies DOL (Department of Labor)	$16,759,865	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
34	Johnson Controls Security Solutions LLC 2 awardees, including Johnson Controls Government Systems, LLC Top agencies GSA (General Services Administration) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$16,611,296	0.5%	Rank history: #62 in FY2021, #16 in FY2022, #14 in FY2024 and not on the FY2025 list; down 18 since FY2022.
35	ABT Global LLC 2 awardees Top agencies HUD (Department of Housing and Urban Development) USDA (Department of Agriculture) ED (Department of Education)	$16,326,384	0.5%	Rank history: #23 in FY2021, #94 in FY2022 and not on the FY2024–FY2025 lists; up 59 since FY2022.
36	Biobot Analytics Inc Top agencies HHS (Department of Health and Human Services)	$16,183,756	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
37	AECOM 3 awardees, including AECOM Technical Services, Inc. and AECOM Italia S.P.A. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) USAF (Department of the Air Force)	$16,001,745	0.5%	Rank history: not on the FY2021 list, #31 in FY2022, #82 in FY2024 and not on the FY2025 list; down 6 since FY2022.
38	Baylor College of Medicine Top agencies HHS (Department of Health and Human Services)	$14,710,421	0.5%	Rank history: #57 in FY2021, #49 in FY2022, #34 in FY2024 and #57 in FY2025; up 11 since FY2022.
39	ASR Analytics, LLC Top agencies Treasury (Department of the Treasury)	$14,287,110	0.4%	Rank history: #35 in FY2021, #41 in FY2022, #28 in FY2024 and #33 in FY2025; up 2 since FY2022.
40	National Opinion Research Center Top agencies NSF (National Science Foundation) DHRA (Defense Human Resources Activity) HHS (Department of Health and Human Services)	$13,412,514	0.4%	Rank history: not on the FY2021 list, #50 in FY2022, #38 in FY2024 and #47 in FY2025; up 10 since FY2022.
41	Applied Research Associates, Inc. 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$12,963,130	0.4%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2024 and not on the FY2025 list; up 313 since FY2022.
42	Gomez Research Associates Inc. Top agencies Navy (Department of the Navy)	$11,416,140	0.3%	Rank history: #49 in FY2021, #56 in FY2022 and not on the FY2024–FY2025 lists; up 14 since FY2022.
43	Acumen LLC Top agencies HHS (Department of Health and Human Services)	$11,139,691	0.3%	Rank history: #32 in FY2021, #39 in FY2022, #46 in FY2024 and #73 in FY2025; down 4 since FY2022.
44	Swca Incorporated Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$11,065,851	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 322 since FY2022.
45	Trane U.S. Inc. Top agencies GSA (General Services Administration) USAF (Department of the Air Force)	$10,872,181	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 256 since FY2022.
46	Cherokee Insights LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$10,121,000	0.3%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2024 and #61 in FY2025; new.
47	Pe Ayuda Joint Venture LLC Top agencies Army (Department of the Army)	$10,103,482	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
48	Noresco, LLC Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security)	$10,032,704	0.3%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #41 in FY2025; new.
49	American Forests Top agencies DOI (Department of the Interior)	$10,000,000	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
50	S.P. Cramer & Associates, Inc. Top agencies Army (Department of the Army)	$9,613,150	0.3%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2024 and #72 in FY2025; new.
51	Mid Atlantic Technical and Executive Consulting, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$9,266,799	0.3%	Rank history: #95 in FY2021, #68 in FY2022, #45 in FY2024 and #75 in FY2025; up 17 since FY2022.
52	State of California Controllers Office 12 awardees, including University of California, Davis, University of California Irvine and San Diego State University Foundation Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) Navy (Department of the Navy)	$8,933,226	0.3%	Rank history: #41 in FY2021, #55 in FY2022, #70 in FY2024 and not on the FY2025 list; up 3 since FY2022.
53	Leidos Holdings, Inc. 8 awardees, including Leidos, Inc. Top agencies HUD (Department of Housing and Urban Development) OSD (Office of the Secretary of Defense) WHS (DOD Washington Headquarters Service)	$8,792,491	0.3%	Rank history: #8 in FY2021, #17 in FY2022 and not on the FY2024–FY2025 lists; down 36 since FY2022.
54	Honeywell International Inc. 2 awardees Top agencies USAF (Department of the Air Force) GSA (General Services Administration) NASA (National Aeronautics and Space Administration)	$8,540,911	0.3%	Rank history: #53 in FY2021, #60 in FY2022, not on the FY2024 list and #18 in FY2025; up 6 since FY2022.
55	UnitedHealth Group Incorporated 2 awardees, including The Lewin Group, Inc. and Optuminsight Life Sciences Inc. Top agencies HHS (Department of Health and Human Services)	$8,382,803	0.3%	Rank history: #19 in FY2021, #42 in FY2022, #63 in FY2024 and not on the FY2025 list; down 13 since FY2022.
56	The Boeing Company 7 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$8,089,631	0.2%	Rank history: #31 in FY2021, #32 in FY2022, #35 in FY2024 and not on the FY2025 list; down 24 since FY2022.
57	Information Management Services, Inc. Top agencies HHS (Department of Health and Human Services)	$8,022,783	0.2%	Rank history: #68 in FY2021, #64 in FY2022, #67 in FY2024 and #78 in FY2025; up 7 since FY2022.
58	Goldbelt, Incorporated Through Goldbelt C6, LLC Top agencies HHS (Department of Health and Human Services)	$7,798,987	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 92 since FY2022.
59	Afognak Native Corporation Through Shields Point LLC Top agencies DOJ (Department of Justice)	$7,694,095	0.2%	Rank history: #52 in FY2021, #53 in FY2022, #59 in FY2024 and not on the FY2025 list; down 6 since FY2022.
60	Cooper Zietz Engineers, Inc. Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services)	$7,435,473	0.2%	Rank history: #87 in FY2021, #69 in FY2022, #84 in FY2024 and not on the FY2025 list; up 9 since FY2022.
61	Centerpoint Energy, Inc. Through Energy Systems Group, LLC Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$7,397,599	0.2%	Rank history: #34 in FY2021, #58 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
62	Tecolote Research, Inc. Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army)	$7,382,714	0.2%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2024 and #39 in FY2025; up 54 since FY2022.
63	Arctic Slope Regional Corporation 5 awardees, including Netcentric Technology, LLC, Environmental Quality Management, Inc. and Asrc Federal Data Network Technologies, LLC Top agencies Commerce (Department of Commerce) Army (Department of the Army) EPA (Environmental Protection Agency)	$7,099,911	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #83 in FY2025; up 379 since FY2022.
64	Mipps, LLC Top agencies DHA (Defense Health Agency)	$7,017,667	0.2%	Rank history: not on the FY2021–FY2022 lists, #55 in FY2024 and #45 in FY2025; new.
65	Olgoonik Corporation Through Olgoonik Solutions LLC Top agencies DOS (Department of State)	$6,910,226	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
66	General Atomic Technologies Corporation 2 awardees, including General Atomics Top agencies Navy (Department of the Navy) USSOCOM (United States Special Operations Command)	$6,737,044	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 162 since FY2022.
67	American Institutes for Research In the Behavioral Sciences 2 awardees Top agencies ED (Department of Education) HHS (Department of Health and Human Services) NSF (National Science Foundation)	$6,650,639	0.2%	Rank history: #40 in FY2021, #37 in FY2022, #48 in FY2024 and not on the FY2025 list; down 30 since FY2022.
68	Pb&A / CSS JV, Llc. Top agencies EPA (Environmental Protection Agency)	$6,587,932	0.2%	Rank history: not on the FY2021 list, #63 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
69	Collabralink Technologies Inc. Through Groundswell Corporation Top agencies DOT (Department of Transportation)	$6,498,435	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
70	New South Associates, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior) GSA (General Services Administration)	$6,468,673	0.2%	Rank history: #51 in FY2021, #59 in FY2022, #60 in FY2024 and #43 in FY2025; down 11 since FY2022.
71	Kpmg L.L.P. 2 awardees Top agencies DOL (Department of Labor) DOT (Department of Transportation)	$6,459,199	0.2%	Rank history: #29 in FY2021, #65 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
72	The Tatitlek Corporation Through Tatitlek Federal Services LLC Top agencies DOS (Department of State)	$6,332,776	0.2%	Rank history: #58 in FY2021, #71 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
73	Otak, Inc. Top agencies DOI (Department of the Interior)	$6,196,425	0.2%	Rank history: #75 in FY2021, not on the FY2022 list, #100 in FY2024 and not on the FY2025 list; up 31 since FY2022.
74	The Precision Group, LLC Top agencies DOJ (Department of Justice)	$6,193,972	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #77 in FY2025; up 97 since FY2022.
75	Southwest Research Institute 2 awardees, including Signature Science LLC Top agencies DHS (Department of Homeland Security) NRC (Nuclear Regulatory Commission) Commerce (Department of Commerce)	$5,984,740	0.2%	Rank history: #47 in FY2021, #78 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
76	Summit Consulting LLC Top agencies HUD (Department of Housing and Urban Development) Treasury (Department of the Treasury) DOL (Department of Labor)	$5,966,930	0.2%	Rank history: #61 in FY2021, #76 in FY2022, not on the FY2024 list and #87 in FY2025; unchanged since FY2022.
77	The Medical College of Wisconsin, Inc. Top agencies HHS (Department of Health and Human Services) DOT (Department of Transportation)	$5,874,799	0.2%	Rank history: #78 in FY2021, #61 in FY2022, #77 in FY2024 and #66 in FY2025; down 16 since FY2022.
78	Scientific Research Corporation Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army)	$5,768,469	0.2%	Rank history: #44 in FY2021, not on the FY2022 list, #96 in FY2024 and not on the FY2025 list; up 59 since FY2022.
79	Jacobs Engineering Group Inc. 2 awardees Top agencies Army (Department of the Army) GSA (General Services Administration)	$5,767,500	0.2%	Rank history: not on the FY2021 list, #73 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
80	The Texas A&M University System 5 awardees, including Texas A&M Agrilife Research, Texas A & M University Kingsville and Texas A & M University Top agencies DOI (Department of the Interior) Navy (Department of the Navy) Army (Department of the Army)	$5,518,487	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
81	Tanaq Management Services LLC Top agencies HHS (Department of Health and Human Services)	$5,483,369	0.2%	Rank history: not on the FY2021–FY2022 lists, #72 in FY2024 and #67 in FY2025; new.
82	Universal Technical Resource Services Inc. Top agencies USAF (Department of the Air Force)	$5,418,140	0.2%	Rank history: not on the FY2021 list, #84 in FY2022, #78 in FY2024 and #65 in FY2025; up 2 since FY2022.
83	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$5,356,506	0.2%	Rank history: #46 in FY2021, #52 in FY2022, #51 in FY2024 and #46 in FY2025; down 31 since FY2022.
84	CVS Health Corporation Through CVS Healthspire Payor & Life Sciences LLC Top agencies HHS (Department of Health and Human Services)	$5,301,922	0.2%	Rank history: #66 in FY2021, #75 in FY2022, not on the FY2024 list and #62 in FY2025; down 9 since FY2022.
85	Blue World Research Institute Inc. Top agencies DOI (Department of the Interior)	$5,251,072	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 81 since FY2022.
86	Far Western Anthropological Research Group, Inc. Top agencies Navy (Department of the Navy) USDA (Department of Agriculture) DOI (Department of the Interior)	$5,250,305	0.2%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2024 and not on the FY2025 list; up 75 since FY2022.
87	A.i.s., Inc. Top agencies Commerce (Department of Commerce)	$5,226,932	0.2%	Rank history: #56 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 32 since FY2022.
88	Mission Solutions Group Inc. Top agencies USAF (Department of the Air Force)	$5,191,325	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
89	MRIGLOBAL Top agencies DOD (Department of Defense) HHS (Department of Health and Human Services)	$5,190,332	0.2%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2024 and #79 in FY2025; new.
90	Spaulding Clinical Research, LLC Top agencies HHS (Department of Health and Human Services)	$5,163,134	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
91	Lovelace Biomedical Research Institute Top agencies HHS (Department of Health and Human Services)	$5,124,444	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #27 in FY2025; new.
92	Applied Enterprise Management Corporation Top agencies ED (Department of Education)	$5,089,797	0.2%	Rank history: not on the FY2021–FY2022 lists, #30 in FY2024 and #74 in FY2025; up 71 since FY2022.
93	Cssi Inc. Top agencies DOT (Department of Transportation)	$5,089,741	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
94	Hart Technologies, Inc. Top agencies Navy (Department of the Navy)	$4,953,099	0.2%	Rank history: #55 in FY2021, not on the FY2022 list, #64 in FY2024 and #56 in FY2025; up 8 since FY2022.
95	Techlaw, Inc. Through Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$4,868,375	0.1%	Rank history: not on the FY2021 list, #81 in FY2022 and not on the FY2024–FY2025 lists; down 14 since FY2022.
96	Stantec Inc. 4 awardees, including Stantec Consulting Services Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) GSA (General Services Administration)	$4,862,440	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
97	Industrial Economics Inc. Top agencies DOI (Department of the Interior) DHS (Department of Homeland Security) EPA (Environmental Protection Agency)	$4,849,291	0.1%	Rank history: not on the FY2021 list, #85 in FY2022 and not on the FY2024–FY2025 lists; down 12 since FY2022.
98	Koniag Management Solutions LLC Top agencies DHA (Defense Health Agency)	$4,810,578	0.1%	Rank history: #48 in FY2021, #62 in FY2022 and not on the FY2024–FY2025 lists; down 36 since FY2022.
99	Productable Inc. Top agencies USAF (Department of the Air Force)	$4,786,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 63 since FY2022.
100	WSP USA Solutions Inc. Top agencies DOE (Department of Energy) GSA (General Services Administration) DHS (Department of Homeland Security)	$4,714,861	0.1%	Rank history: #89 in FY2021, #82 in FY2022 and not on the FY2024–FY2025 lists; down 18 since FY2022.

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100 of 2,310 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC B5

Code	Net obligations	Largest contractor
B541 Defense Studies	$737,195,474	Institute for Defense Analyses
B599 Other Special Studies and Analysis	$500,127,688	Booz Allen Hamilton Holding Corporation
B506 Data Analysis (other than scientific)	$225,938,913	Educational Testing Service
B510 Environmental Studies and Assessments	$224,166,265	Tetra Tech, Inc.
B529 Scientific Data Studies	$164,979,548	Riva Solutions Inc
B537 Medical and Health Studies	$151,537,971	Harvard Pilgrim Health Care Inc
B550 Organization/Administrative/Personnel Studies	$124,424,069	The Rand Corporation
B546 Security Studies (Physical and Personal)	$118,354,699	Unwin Co
B542 Educational Studies and Analysis	$96,711,246	Research Triangle Institute
B504 Chemical/Biological Studies and Analysis	$87,201,974	Ginkgo Bioworks Holdings Inc.
B544 Technology Studies	$50,638,546	Gartner, Inc.
B503 Archeological/Paleontological Studies	$48,465,976	New South Associates, Inc.
B547 Accounting/Financial Management Studies	$38,793,935	Deloitte LLP
B509 Endangered Species Studies – Plant and Animal	$38,281,144	General Dynamics Corporation
B516 Animal and Fisheries Studies	$38,090,543	S.P. Cramer & Associates, Inc.
B528 Regulatory Studies	$33,903,778	ICF International, Inc.
B507 Economic Studies	$27,435,896	The Mitre Corporation
B543 Energy Studies	$20,966,582	Johnson Controls Security Solutions LLC
B553 Communications Studies	$17,220,877	The Precision Group, LLC
B532 Soil Studies	$15,264,009	American Forests
B533 Water Quality Studies	$14,974,019	The Haskell Company
B524 Mathematical/Statistical Analysis	$12,728,916	Carnegie-Mellon University
B521 Historical Studies	$11,518,228	Team Henry Enterprises, LLC
B502 Air Quality Analysis	$10,860,285	Air Resource Specialists, Inc.
B522 Legal Studies	$4,986,572	Synergy Enterprises, Inc.
B534 Wildlife Studies	$4,182,197	LGL Ecological Research Associates, Inc.
B517 Geological Studies	$3,465,025	Athena Technologies Inc.
B525 Natural Resource Studies	$3,252,790	Siskiyou Biosurvey LLC

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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 $3.27 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 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 B5 contractors in FY2023?

1. The Rand Corporation ($251M), 2. Institute for Defense Analyses ($220M), 3. The Johns Hopkins University ($177M), 4. Booz Allen Hamilton Holding Corporation ($133M), 5. Research Triangle Institute ($128M), 6. The CNA Corporation ($98.2M), 7. Educational Testing Service ($66.6M), 8. Parsons Corporation ($52.2M), 9. Emory University ($51.4M), 10. Ameresco Inc. ($45.9M).

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