Top 100 Contractors in PSC B5: Special Studies – Not R&D, FY2021

Name: Top 100 Contractors in PSC B5: Special Studies – Not R&D, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 40% of FY2021 PSC B5 contract dollars

Contract obligations: $2,608,972,295 Net of deobligations, by contracts coded PSC B5 or a code under it
Contractors: 2,311 Parent companies with an obligation
Largest contractor: The Rand Corporation $223 million, 8.2% 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 OSD (Office of the Secretary of Defense) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$223,116,156	8.2%	Rank history: #1 in FY2022, #1 in FY2023, #2 in FY2024 and #5 in FY2025; up 3 since FY2020.
2	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)	$197,186,930	7.2%	Rank history: #5 in FY2022, #3 in FY2023, #57 in FY2024 and not on the FY2025 list; unchanged since FY2020.
3	Institute for Defense Analyses Top agencies OSD (Office of the Secretary of Defense) DSCA (Defense Security Cooperation Agency) Army (Department of the Army)	$196,518,599	7.2%	Rank history: #2 in FY2022, #2 in FY2023, #1 in FY2024 and not on the FY2025 list; unchanged since FY2020.
4	Booz Allen Hamilton Holding Corporation 2 awardees, including Booz Allen Hamilton Inc. Top agencies NASA (National Aeronautics and Space Administration) Treasury (Department of the Treasury) DOT (Department of Transportation)	$106,618,183	3.9%	Rank history: #3 in FY2022, #4 in FY2023, #6 in FY2024 and #8 in FY2025; up 2 since FY2020.
5	The CNA Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force)	$95,824,988	3.5%	Rank history: #6 in FY2022, #6 in FY2023, #7 in FY2024 and #7 in FY2025; up 2 since FY2020.
6	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) ED (Department of Education) NSF (National Science Foundation)	$82,666,136	3.0%	Rank history: #4 in FY2022, #5 in FY2023, #5 in FY2024 and #9 in FY2025; down 1 since FY2020.
7	Educational Testing Service Top agencies ED (Department of Education)	$61,987,625	2.3%	Rank history: #7 in FY2022, #7 in FY2023, #9 in FY2024 and #10 in FY2025; up 2 since FY2020.
8	Leidos Holdings, Inc. 12 awardees, including Leidos, Inc., Reveal Imaging Technologies, Inc. and Dynetics, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$52,519,980	1.9%	Rank history: #17 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
9	Deloitte LLP 3 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury) USAF (Department of the Air Force)	$46,176,807	1.7%	Rank history: #12 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
10	BAE Systems PLC 2 awardees, including BAE Systems Technology Solutions & Services Inc. and BAE Systems Controls Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$44,520,322	1.6%	Rank history: #9 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
11	Harvard Pilgrim Health Care, Inc. 2 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$41,055,887	1.5%	Rank history: #13 in FY2022, #12 in FY2023, #13 in FY2024 and #19 in FY2025; up 1 since FY2020.
12	Ameresco Inc. 2 awardees, including Ameresco Federal Solutions, Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) GSA (General Services Administration)	$40,068,863	1.5%	Rank history: #20 in FY2022, #10 in FY2023, #21 in FY2024 and #1 in FY2025; up 10 since FY2020.
13	Guidehouse Inc. 2 awardees Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$33,923,009	1.2%	Rank history: #10 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
14	Unwin Co Top agencies DOE (Department of Energy)	$33,705,862	1.2%	Rank history: #11 in FY2022, #11 in FY2023, #12 in FY2024 and #14 in FY2025; up 3 since FY2020.
15	Westat, Inc. Top agencies ED (Department of Education) NSF (National Science Foundation) SSA (Social Security Administration)	$30,293,871	1.1%	Rank history: #22 in FY2022, #16 in FY2023, #11 in FY2024 and #17 in FY2025; up 1 since FY2020.
16	International Business Machines Corporation 2 awardees Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$30,279,108	1.1%	Rank history: #25 in FY2022, not on the FY2023–FY2024 lists and #55 in FY2025; up 16 since FY2020.
17	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) DOJ (Department of Justice)	$25,951,586	0.9%	Rank history: #21 in FY2022, #23 in FY2023, #62 in FY2024 and not on the FY2025 list; up 9 since FY2020.
18	H.i.g. Capital Management Inc. Through Empower AI, Inc. Top agencies HHS (Department of Health and Human Services)	$23,275,552	0.9%	Rank history: #23 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
19	UnitedHealth Group Incorporated 2 awardees, including The Lewin Group, Inc. and Optuminsight Life Sciences Inc. Top agencies HHS (Department of Health and Human Services)	$21,551,465	0.8%	Rank history: #42 in FY2022, #55 in FY2023, #63 in FY2024 and not on the FY2025 list; up 66 since FY2020.
20	National Academy of Sciences Top agencies DOE (Department of Energy) SSA (Social Security Administration) OSD (Office of the Secretary of Defense)	$20,586,829	0.8%	Rank history: #24 in FY2022, #28 in FY2023, #31 in FY2024 and #53 in FY2025; unchanged since FY2020.
21	CACI International Inc. 2 awardees, including Caci, Inc. - Federal and Caci, LLC - Commercial Top agencies DTRA (Defense Threat Reduction Agency) DOJ (Department of Justice)	$20,096,835	0.7%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
22	The Broad Institute, Inc. Top agencies HHS (Department of Health and Human Services)	$18,419,641	0.7%	Rank history: #35 in FY2022, not on the FY2023 list, #25 in FY2024 and not on the FY2025 list; down 9 since FY2020.
23	ABT Global LLC 2 awardees Top agencies HUD (Department of Housing and Urban Development) SSA (Social Security Administration) ED (Department of Education)	$18,270,504	0.7%	Rank history: #94 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; up 47 since FY2020.
24	Janus Research Group, LLC Top agencies Army (Department of the Army)	$17,529,950	0.6%	Rank history: #19 in FY2022, #26 in FY2023, #36 in FY2024 and #36 in FY2025; up 5 since FY2020.
25	The Mitre Corporation 2 awardees Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) EXIM (Export Import Bank of the US)	$17,235,696	0.6%	Rank history: #18 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
26	Lockheed Martin Corporation 5 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$17,156,003	0.6%	Rank history: #14 in FY2022, #31 in FY2023, #20 in FY2024 and #31 in FY2025; down 1 since FY2020.
27	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)	$16,572,735	0.6%	Rank history: #27 in FY2022, #25 in FY2023, #17 in FY2024 and #60 in FY2025; up 29 since FY2020.
28	Riva Solutions Inc. Top agencies DOL (Department of Labor)	$15,999,291	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	Kpmg L.L.P. 2 awardees Top agencies DOL (Department of Labor) Navy (Department of the Navy) DOT (Department of Transportation)	$15,553,020	0.6%	Rank history: #65 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; up 18 since FY2020.
30	BAE Systems Land & Armaments L.P. Through BAE Systems Technology Solutions & Services Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$15,342,143	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	The Boeing Company 8 awardees, including Liquid Robotics, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOI (Department of the Interior)	$15,294,641	0.6%	Rank history: #32 in FY2022, #56 in FY2023, #35 in FY2024 and not on the FY2025 list; down 10 since FY2020.
32	Acumen LLC Top agencies HHS (Department of Health and Human Services)	$14,868,794	0.5%	Rank history: #39 in FY2022, #43 in FY2023, #46 in FY2024 and #73 in FY2025; up 48 since FY2020.
33	Booz Allen Hamilton Inc. Top agencies DHS (Department of Homeland Security) OSD (Office of the Secretary of Defense) Treasury (Department of the Treasury)	$14,246,799	0.5%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
34	Centerpoint Energy, Inc. Through Energy Systems Group, LLC Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$13,057,870	0.5%	Rank history: #58 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
35	ASR Analytics, LLC Top agencies Treasury (Department of the Treasury)	$11,804,144	0.4%	Rank history: #41 in FY2022, #39 in FY2023, #28 in FY2024 and #33 in FY2025; up 4 since FY2020.
36	RTX Corporation 6 awardees, including Hamilton Sundstrand Space Systems International, Inc., Noresco, LLC and Everfox LLC Top agencies NASA (National Aeronautics and Space Administration) DHS (Department of Homeland Security) DOE (Department of Energy)	$11,010,336	0.4%	Rank history: #44 in FY2022, #21 in FY2023, #44 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
37	Iqvia Inc. 2 awardees, including Iqvia Government Solutions Inc. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$10,277,798	0.4%	Rank history: #28 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; up 7 since FY2020.
38	Cssi, LLC Top agencies DOT (Department of Transportation)	$9,996,967	0.4%	Rank history: #48 in FY2022 and not on the FY2023–FY2025 lists; up 29 since FY2020.
39	RMC 2021 LLC Top agencies Navy (Department of the Navy)	$9,895,368	0.4%	Rank history: #15 in FY2022, #20 in FY2023, #29 in FY2024 and #22 in FY2025; down 9 since FY2020.
40	American Institutes for Research In the Behavioral Sciences 2 awardees Top agencies ED (Department of Education) HHS (Department of Health and Human Services)	$9,852,637	0.4%	Rank history: #37 in FY2022, #67 in FY2023, #48 in FY2024 and not on the FY2025 list; up 1 since FY2020.
41	State of California Controllers Office 18 awardees, including University of California, Davis, California Department of Fish & Wildlife and University of California, LOS Angeles Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) Army (Department of the Army)	$9,396,111	0.3%	Rank history: #55 in FY2022, #52 in FY2023, #70 in FY2024 and not on the FY2025 list; up 22 since FY2020.
42	Tetra Tech, Inc. 13 awardees, including Tetra TECH EC, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOE (Department of Energy)	$9,030,780	0.3%	Rank history: #30 in FY2022, #27 in FY2023, #32 in FY2024 and #20 in FY2025; down 2 since FY2020.
43	Nova Global Supply and Services LLC 2 awardees, including Valiant Global Defense Services Inc. Top agencies Army (Department of the Army) OSD (Office of the Secretary of Defense)	$8,569,752	0.3%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; up 43 since FY2020.
44	Scientific Research Corporation Top agencies OSD (Office of the Secretary of Defense)	$8,510,028	0.3%	Rank history: not on the FY2022 list, #78 in FY2023, #96 in FY2024 and not on the FY2025 list; up 53 since FY2020.
45	Olgoonik Corporation 2 awardees, including Olgoonik Solutions LLC and Olgoonik Enterprises, LLC Top agencies DOS (Department of State) HHS (Department of Health and Human Services)	$8,447,017	0.3%	Rank history: #47 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
46	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$8,296,003	0.3%	Rank history: #52 in FY2022, #83 in FY2023, #51 in FY2024 and #46 in FY2025; up 2 since FY2020.
47	Southwest Research Institute 2 awardees, including Signature Science LLC Top agencies NRC (Nuclear Regulatory Commission) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$8,264,265	0.3%	Rank history: #78 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
48	Koniag Management Solutions LLC Top agencies DHA (Defense Health Agency)	$8,250,212	0.3%	Rank history: #62 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; up 51 since FY2020.
49	Gomez Research Associates Inc. Top agencies Navy (Department of the Navy)	$8,094,611	0.3%	Rank history: #56 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; down 11 since FY2020.
50	Stantec Incorporated 5 awardees, including Stantec Consulting Services Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$7,838,304	0.3%	Rank history: not on the FY2022–FY2025 lists; up 51 since FY2020.
51	New South Associates, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$7,268,069	0.3%	Rank history: #59 in FY2022, #70 in FY2023, #60 in FY2024 and #43 in FY2025; down 17 since FY2020.
52	Afognak Native Corporation Through Shields Point LLC Top agencies DOJ (Department of Justice)	$7,051,489	0.3%	Rank history: #53 in FY2022, #59 in FY2023, #59 in FY2024 and not on the FY2025 list; up 14 since FY2020.
53	Honeywell International Inc. 2 awardees Top agencies USAF (Department of the Air Force) GSA (General Services Administration) DOS (Department of State)	$7,016,094	0.3%	Rank history: #60 in FY2022, #54 in FY2023, not on the FY2024 list and #18 in FY2025; up 145 since FY2020.
54	Healthverity Inc. Top agencies HHS (Department of Health and Human Services)	$6,844,026	0.3%	Rank history: #45 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
55	Hart Technologies, Inc. Top agencies Navy (Department of the Navy)	$6,819,467	0.2%	Rank history: not on the FY2022 list, #94 in FY2023, #64 in FY2024 and #56 in FY2025; up 2 since FY2020.
56	A.i.s., Inc. Top agencies Commerce (Department of Commerce)	$6,654,715	0.2%	Rank history: not on the FY2022 list, #87 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
57	Baylor College of Medicine Top agencies HHS (Department of Health and Human Services)	$6,645,319	0.2%	Rank history: #49 in FY2022, #38 in FY2023, #34 in FY2024 and #57 in FY2025; down 2 since FY2020.
58	The Tatitlek Corporation 2 awardees, including Tatitlek Federal Services LLC and Tatitlek Technologies, LLC Top agencies DOS (Department of State)	$6,516,028	0.2%	Rank history: #71 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
59	Systems Planning and Analysis, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) Navy (Department of the Navy) USAF (Department of the Air Force)	$6,484,569	0.2%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; up 14 since FY2020.
60	Foundation for Atlanta Veterans Education and Research, Inc. Top agencies HHS (Department of Health and Human Services)	$6,445,149	0.2%	Rank history: not on the FY2022–FY2025 lists; up 68 since FY2020.
61	Summit Consulting LLC Top agencies Treasury (Department of the Treasury) DOL (Department of Labor) DOI (Department of the Interior)	$6,419,471	0.2%	Rank history: #76 in FY2022, #76 in FY2023, not on the FY2024 list and #87 in FY2025; up 106 since FY2020.
62	Johnson Controls Security Solutions LLC 3 awardees, including Johnson Controls Government Systems, LLC and Shoppertrak RCT LLC Top agencies USAF (Department of the Air Force) GSA (General Services Administration) DHS (Department of Homeland Security)	$6,165,776	0.2%	Rank history: #16 in FY2022, #34 in FY2023, #14 in FY2024 and not on the FY2025 list; up 76 since FY2020.
63	Lynker Corporation Top agencies Commerce (Department of Commerce)	$6,082,462	0.2%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
64	Environmental Management & Planning Solutions LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$5,999,736	0.2%	Rank history: #43 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
65	Siemens Aktiengesellschaft Through Siemens Government Technologies Inc. Top agencies DOI (Department of the Interior)	$5,972,562	0.2%	Rank history: not on the FY2022–FY2025 lists; up 47 since FY2020.
66	CVS Health Corporation Through CVS Healthspire Payor & Life Sciences LLC Top agencies HHS (Department of Health and Human Services)	$5,809,159	0.2%	Rank history: #75 in FY2022, #84 in FY2023, not on the FY2024 list and #62 in FY2025; up 119 since FY2020.
67	Science Applications International Corporation 3 awardees, including Engility Services, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOT (Department of Transportation)	$5,804,939	0.2%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
68	Information Management Services, Inc. Top agencies HHS (Department of Health and Human Services)	$5,723,061	0.2%	Rank history: #64 in FY2022, #57 in FY2023, #67 in FY2024 and #78 in FY2025; unchanged since FY2020.
69	Group W Inc. Top agencies Navy (Department of the Navy)	$5,702,780	0.2%	Rank history: #93 in FY2022, not on the FY2023 list, #61 in FY2024 and #63 in FY2025; down 7 since FY2020.
70	New York Genome Center, Inc. Top agencies HHS (Department of Health and Human Services)	$5,640,230	0.2%	Rank history: not on the FY2022–FY2023 lists, #88 in FY2024 and not on the FY2025 list; up 236 since FY2020.
71	The Chenega Corporation Through Chenega Analytic Business Solutions, LLC Top agencies Army (Department of the Army)	$5,541,427	0.2%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
72	Francisco Partners Management Through Everfox LLC Top agencies USAF (Department of the Air Force)	$5,366,424	0.2%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
73	Logistics Management Institute Top agencies GSA (General Services Administration) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$5,338,431	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
74	General Dynamics Corporation 6 awardees, including General Dynamics Information Technology Inc., Csra LLC and General Dynamics Mission Systems, Inc. Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$5,071,202	0.2%	Rank history: #40 in FY2022, #22 in FY2023, #33 in FY2024 and #44 in FY2025; down 13 since FY2020.
75	Otak, Inc. Top agencies DOI (Department of the Interior)	$5,067,315	0.2%	Rank history: not on the FY2022 list, #73 in FY2023, #100 in FY2024 and not on the FY2025 list; up 88 since FY2020.
76	Pact, Inc. Top agencies USAID (US Agency for International Development)	$5,000,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
77	Bureau Van Dijk Electronic Publishing Inc. Top agencies Treasury (Department of the Treasury) OSD (Office of the Secretary of Defense)	$4,924,034	0.2%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; up 30 since FY2020.
78	The Medical College of Wisconsin, Inc. Top agencies HHS (Department of Health and Human Services)	$4,730,240	0.2%	Rank history: #61 in FY2022, #77 in FY2023, #77 in FY2024 and #66 in FY2025; up 3 since FY2020.
79	Solutions Development Corp Top agencies Navy (Department of the Navy)	$4,500,261	0.2%	Rank history: not on the FY2022–FY2025 lists; down 25 since FY2020.
80	Mathematica Inc 2 awardees Top agencies USDA (Department of Agriculture) SSA (Social Security Administration)	$4,459,400	0.2%	Rank history: #26 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; down 47 since FY2020.
81	Data Recognition Corporation Top agencies DHRA (Defense Human Resources Activity) DODEA (Department of Defense Education Activity)	$4,375,800	0.2%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
82	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$4,338,163	0.2%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
83	Sag Corporation Top agencies VA (Department of Veterans Affairs)	$4,322,234	0.2%	Rank history: #95 in FY2022, not on the FY2023 list, #92 in FY2024 and not on the FY2025 list; unchanged since FY2020.
84	Mriglobal Top agencies WHS (DOD Washington Headquarters Service) HHS (Department of Health and Human Services)	$4,266,069	0.2%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
85	Gryphon Technologies, Inc. Through Gryphon Technologies, L.C. Top agencies USAF (Department of the Air Force)	$4,160,824	0.2%	Rank history: #97 in FY2022, not on the FY2023 list, #97 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
86	EA Engineering, Science, and Technology, Inc., PBC Top agencies Army (Department of the Army) DOI (Department of the Interior) EPA (Environmental Protection Agency)	$4,146,011	0.2%	Rank history: not on the FY2022–FY2025 lists; up 68 since FY2020.
87	Cooper Zietz Engineers, Inc. Top agencies DOI (Department of the Interior)	$4,134,336	0.2%	Rank history: #69 in FY2022, #60 in FY2023, #84 in FY2024 and not on the FY2025 list; down 16 since FY2020.
88	Analytica LLC Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$4,122,549	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
89	WSP USA Solutions Inc. Top agencies DOI (Department of the Interior) DOE (Department of Energy) DOJ (Department of Justice)	$4,096,523	0.1%	Rank history: #82 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; up 231 since FY2020.
90	Wood Environment & Infrastructure Solutions Inc. 2 awardees, including WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,023,672	0.1%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
91	Source Healthcare Analytics LLC Top agencies HHS (Department of Health and Human Services)	$3,964,283	0.1%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
92	PAE Government Services Inc. 3 awardees, including PAE National Security Solutions LLC Top agencies Army (Department of the Army)	$3,911,918	0.1%	Rank history: not on the FY2022–FY2025 lists; down 49 since FY2020.
93	Fors Marsh Group LLC Top agencies DHRA (Defense Human Resources Activity) OSD (Office of the Secretary of Defense) DHS (Department of Homeland Security)	$3,911,151	0.1%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
94	Consolidated Safety Services Incorporated Top agencies EPA (Environmental Protection Agency)	$3,783,899	0.1%	Rank history: not on the FY2022–FY2024 lists and #76 in FY2025; up 20 since FY2020.
95	Mid Atlantic Technical and Executive Consulting, LLC Top agencies Navy (Department of the Navy)	$3,756,540	0.1%	Rank history: #68 in FY2022, #51 in FY2023, #45 in FY2024 and #75 in FY2025; up 224 since FY2020.
96	Sri International Top agencies NSF (National Science Foundation) ED (Department of Education)	$3,727,759	0.1%	Rank history: not on the FY2022–FY2025 lists; up 239 since FY2020.
97	American Systems Corporation Top agencies OSD (Office of the Secretary of Defense)	$3,715,201	0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 341 since FY2020.
98	Salas O'brien Federal, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,686,705	0.1%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
99	Analytic Services Inc. Top agencies OSD (Office of the Secretary of Defense) Commerce (Department of Commerce)	$3,645,745	0.1%	Rank history: not on the FY2022–FY2023 lists, #54 in FY2024 and not on the FY2025 list; down 10 since FY2020.
100	International Archaeology, LLC Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$3,563,044	0.1%	Rank history: not on the FY2022–FY2025 lists; up 32 since FY2020.

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100 of 2,311 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC B5

Code	Net obligations	Largest contractor
B541 Defense Studies	$689,151,155	Institute for Defense Analyses
B599 Other Special Studies and Analysis	$422,034,460	Research Triangle Institute
B506 Data Analysis (other than scientific)	$200,052,842	Educational Testing Service
B537 Medical and Health Studies	$192,876,200	Harvard Pilgrim Health Care, Inc.
B550 Organization/Administrative/Personnel Studies	$131,930,890	The Rand Corporation
B510 Environmental Studies and Assessments	$113,150,587	Stantec Incorporated
B529 Scientific Data Studies	$102,206,388	Riva Solutions Inc.
B546 Security Studies (Physical and Personal)	$84,458,627	Unwin Co
B544 Technology Studies	$50,069,112	Booz Allen Hamilton Holding Corporation
B542 Educational Studies and Analysis	$47,827,972	Westat, Inc.
B503 Archeological/Paleontological Studies	$40,743,179	New South Associates, Inc.
B528 Regulatory Studies	$35,166,628	ICF International, Inc.
B547 Accounting/Financial Management Studies	$33,500,083	Kpmg L.L.P.
B504 Chemical/Biological Studies and Analysis	$32,669,223	PAE Government Services Inc.
B516 Animal and Fisheries Studies	$31,607,596	A.i.s., Inc.
B509 Endangered Species Studies – Plant and Animal	$25,013,268	Deloitte LLP
B543 Energy Studies	$20,003,920	Johnson Controls Security Solutions LLC
B507 Economic Studies	$17,742,173	Sag Corporation
B502 Air Quality Analysis	$14,813,791	Mriglobal
B524 Mathematical/Statistical Analysis	$13,210,277	Summit Consulting LLC
B553 Communications Studies	$9,529,532	The Rand Corporation
B533 Water Quality Studies	$9,028,548	Aptim Federal Services LLC
B521 Historical Studies	$6,755,445	Downtown Business Improvement District Corp
B525 Natural Resource Studies	$4,672,518	Nevada State Veterans Home
B532 Soil Studies	$4,476,504	Nevada State Veterans Home
B517 Geological Studies	$3,558,042	Athena Technologies Inc.
B534 Wildlife Studies	$1,795,643	Asir LLC

Show all 27

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 $2.73 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 FY2021?

1. The Rand Corporation ($223M), 2. The Johns Hopkins University ($197M), 3. Institute for Defense Analyses ($197M), 4. Booz Allen Hamilton Holding Corporation ($107M), 5. The CNA Corporation ($95.8M), 6. Research Triangle Institute ($82.7M), 7. Educational Testing Service ($62M), 8. Leidos Holdings, Inc. ($52.5M), 9. Deloitte LLP ($46.2M), 10. BAE Systems PLC ($44.5M).

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