Top 100 Contractors in PSC R: Support Services (Professional, Administrative, Management), FY2021

Name: Top 100 Contractors in PSC R: Support Services (Professional, Administrative, Management), FY2021
Creator: GovTribe

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

The top 10 won 20% of FY2021 PSC R contract dollars

Contract obligations: $101,884,810,065 Net of deobligations, by contracts coded PSC R or a code under it
Contractors: 17,105 Parent companies with an obligation
Largest contractor: Kbr, Inc. $3.2 billion, 2.9% 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	Kbr, Inc. 12 awardees, including KBR Services, LLC, KBR Wyle Services, LLC and Kord Technologies, LLC Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$3,202,810,551	2.9%	Rank history: #1 in FY2022, #29 in FY2023, #85 in FY2024 and not on the FY2025 list; up 7 since FY2020.
2	Booz Allen Hamilton Holding Corporation 10 awardees, including Booz Allen Hamilton Inc., Liberty It Solutions LLC and Middle Bay Solutions II, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$3,021,433,985	2.8%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; down 1 since FY2020.
3	The Boeing Company 28 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$2,345,348,047	2.1%	Rank history: #5 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; down 1 since FY2020.
4	Lockheed Martin Corporation 35 awardees, including Lockheed Martin Services, LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) Army (Department of the Army)	$2,297,202,990	2.1%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; unchanged since FY2020.
5	General Dynamics Corporation 41 awardees, including General Dynamics Information Technology, Inc., Csra LLC and General Dynamics Land Systems Inc. Top agencies Army (Department of the Army) DOS (Department of State) Navy (Department of the Navy)	$2,164,779,929	2.0%	Rank history: #4 in FY2022, #4 in FY2023, #5 in FY2024 and #7 in FY2025; unchanged since FY2020.
6	Deloitte LLP 5 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) Navy (Department of the Navy)	$1,925,762,592	1.8%	Rank history: #7 in FY2022, #9 in FY2023, #4 in FY2024 and #8 in FY2025; up 10 since FY2020.
7	RTX Corporation 64 awardees, including Raytheon Company and Rockwell Collins, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,869,843,599	1.7%	Rank history: #10 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
8	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$1,590,116,118	1.5%	Rank history: #9 in FY2022, #11 in FY2023, #11 in FY2024 and #16 in FY2025; down 5 since FY2020.
9	Northrop Grumman Corporation 47 awardees, including Northrop Grumman Systems Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$1,543,002,831	1.4%	Rank history: #11 in FY2022, #10 in FY2023, #12 in FY2024 and #9 in FY2025; down 2 since FY2020.
10	Mckesson Corporation 2 awardees, including Mckesson Specialty Distribution LLC and Ndchealth Corporation Top agencies HHS (Department of Health and Human Services)	$1,515,899,561	1.4%	Rank history: #19 in FY2022 and not on the FY2023–FY2025 lists; up 61 since FY2020.
11	Vectrus Systems Corporation 3 awardees, including V2X Systems LLC and Advantor Systems II LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) Treasury (Department of the Treasury)	$1,515,762,138	1.4%	Rank history: #13 in FY2022, #5 in FY2023, #56 in FY2024 and not on the FY2025 list; up 29 since FY2020.
12	Leidos Holdings, Inc. 27 awardees, including Leidos, Inc. and Aranea Solutions Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) USSOCOM (United States Special Operations Command)	$1,503,580,201	1.4%	Rank history: #14 in FY2022, #12 in FY2023, #10 in FY2024 and #11 in FY2025; up 1 since FY2020.
13	CACI International Inc. 24 awardees, including Caci, Inc. - Federal, Caci Nss, LLC and Caci Technologies, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DCSA (Defense Counterintelligence and Security Agency)	$1,453,437,672	1.3%	Rank history: #12 in FY2022, #8 in FY2023, #8 in FY2024 and #6 in FY2025; down 4 since FY2020.
14	Science Applications International Corporation 15 awardees, including Forfeiture Support Associates LLC, Engility Services, LLC and Halfaker and Associates, LLC Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$1,438,833,646	1.3%	Rank history: #8 in FY2022, #7 in FY2023, #9 in FY2024 and #12 in FY2025; down 8 since FY2020.
15	Rapid Deployment Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$1,283,198,668	1.2%	Rank history: #6 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; up 120 since FY2020.
16	Ministry of Defense Top agencies Navy (Department of the Navy)	$1,130,173,545	1.0%	Rank history: #18 in FY2022, #21 in FY2023, #23 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
17	Maximus Inc. 6 awardees, including Maximus Federal Services, Inc., Q2 Administrators, LLC and Maximus Federal Technology Solutions, LLC Top agencies HHS (Department of Health and Human Services) ED (Department of Education) VA (Department of Veterans Affairs)	$1,068,045,464	1.0%	Rank history: #20 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
18	L3Harris Technologies, Inc. 42 awardees, including L3Harris Technologies Integrated Systems L.P., L3 Technologies, Inc. and CAE USA Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) USSOCOM (United States Special Operations Command)	$1,062,778,200	1.0%	Rank history: #15 in FY2022, #16 in FY2023, #27 in FY2024 and #25 in FY2025; down 7 since FY2020.
19	The Aerospace Corporation Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) DOI (Department of the Interior)	$1,049,971,968	1.0%	Rank history: #16 in FY2022, #15 in FY2023, #14 in FY2024 and #15 in FY2025; down 7 since FY2020.
20	Amentum Services, Inc. 4 awardees, including Dyncorp International LLC and URS Federal Services International, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOS (Department of State)	$1,003,153,234	0.9%	Rank history: #22 in FY2022, #25 in FY2023, #13 in FY2024 and not on the FY2025 list; up 61 since FY2020.
21	Accenture Federal Services LLC 5 awardees, including ASM Research, LLC, Accenture LLP and Avanade Inc. Top agencies VA (Department of Veterans Affairs) ED (Department of Education) DHS (Department of Homeland Security)	$990,679,442	0.9%	Rank history: #30 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
22	The Mitre Corporation 2 awardees Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) VA (Department of Veterans Affairs)	$953,278,726	0.9%	Rank history: #17 in FY2022, #13 in FY2023, #18 in FY2024 and #23 in FY2025; down 12 since FY2020.
23	Mantech International Corporation 9 awardees, including Mantech Advanced Systems International, Inc., Mantech SRS Technologies, Inc. and Tapestry Technologies, Inc. Top agencies Army (Department of the Army) DOJ (Department of Justice) USAF (Department of the Air Force)	$625,328,464	0.6%	Rank history: #23 in FY2022, #34 in FY2023, #31 in FY2024 and #33 in FY2025; up 3 since FY2020.
24	Guidehouse Inc. 2 awardees Top agencies SBA (Small Business Administration) HHS (Department of Health and Human Services) DOS (Department of State)	$602,231,047	0.6%	Rank history: #32 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
25	Jacobs Engineering Group Inc. 25 awardees, including Amentum Technology, Inc., Ch2M Hill - CDM Pa-Tac Recovery Services and Ch2M Facility Support Services, LLC Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army) DHS (Department of Homeland Security)	$598,737,005	0.5%	Rank history: #33 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
26	Serco North America (Holdings) Inc 7 awardees, including Serco Inc., Serco-Ips Corporation and Whitney Bradley & Brown, Inc. Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$582,341,191	0.5%	Rank history: #24 in FY2022, #47 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
27	Cherokee Nation 12 awardees, including Cherokee Nation Management & Consulting, L.l.c.., Cherokee Nation Strategic Programs, L.L.C. and Cherokee Federal Solutions, L.L.C. Top agencies DOS (Department of State) USAF (Department of the Air Force) DHA (Defense Health Agency)	$554,674,092	0.5%	Rank history: #80 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; up 39 since FY2020.
28	Sierra Nevada Company, LLC 2 awardees Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) WHS (DOD Washington Headquarters Service)	$553,027,488	0.5%	Rank history: #46 in FY2022, #43 in FY2023, #32 in FY2024 and #34 in FY2025; down 4 since FY2020.
29	Parsons Corporation 11 awardees, including Parsons Government Services Inc., Polaris Alpha, LLC and Ptsi Managed Services Inc. Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Army (Department of the Army)	$537,516,036	0.5%	Rank history: #28 in FY2022, #26 in FY2023, #24 in FY2024 and #20 in FY2025; up 3 since FY2020.
30	General Atomic Technologies Corporation 2 awardees, including General Atomics Aeronautical Systems, Inc. and General Atomics Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) DOE (Department of Energy)	$512,203,740	0.5%	Rank history: #34 in FY2022, #35 in FY2023, #38 in FY2024 and not on the FY2025 list; up 3 since FY2020.
31	Omnicom Group Inc. 8 awardees, including DDB Chicago Inc., Gsd&M LLC and Porter Novelli Public Services Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$506,349,804	0.5%	Rank history: #31 in FY2022, #19 in FY2023, #78 in FY2024 and not on the FY2025 list; down 2 since FY2020.
32	PAE Government Services Inc. 9 awardees, including Macfadden & Associates, Inc., FCI Federal, LLC and PAE Professional Services, LLC Top agencies DOS (Department of State) DHS (Department of Homeland Security) USAID (US Agency for International Development)	$497,580,301	0.5%	Rank history: #37 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
33	BAE Systems PLC 14 awardees, including BAE Systems Technology Solutions & Services Inc., BAE Systems Land & Armaments L.P. and BAE Systems Information and Electronic Systems Integration Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$480,462,685	0.4%	Rank history: #27 in FY2022, #23 in FY2023, #28 in FY2024 and #27 in FY2025; down 3 since FY2020.
34	Alion Science and Technology Corporation 3 awardees, including HII Mission Technologies Corp Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DTRA (Defense Threat Reduction Agency)	$459,801,638	0.4%	Rank history: #59 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
35	Fluor Corporation 4 awardees, including Fluor Intercontinental, Inc., Fluor Federal Petroleum Operations, LLC and Fluor Enterprises, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) DHS (Department of Homeland Security)	$455,721,252	0.4%	Rank history: #53 in FY2022, #39 in FY2023, #35 in FY2024 and #31 in FY2025; down 18 since FY2020.
36	The Interpublic Group of Companies Inc 7 awardees, including IPG Dxtra, Inc., True North Communications Inc. and Mullenlowe US Inc. Top agencies HHS (Department of Health and Human Services) DHRA (Defense Human Resources Activity) DOS (Department of State)	$438,162,888	0.4%	Rank history: #47 in FY2022, #41 in FY2023, #54 in FY2024 and not on the FY2025 list; up 60 since FY2020.
37	Perspecta Inc. 10 awardees, including Peraton Risk Decision Inc., Peraton Technology Services Inc. and Dhpc Technologies, Inc. Top agencies Army (Department of the Army) DCSA (Defense Counterintelligence and Security Agency) ED (Department of Education)	$406,947,658	0.4%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
38	Tetra Tech, Inc. 30 awardees, including Ard, Inc., Management Systems International, Inc. and Advanced Management Technology, Inc. Top agencies USAID (US Agency for International Development) DOT (Department of Transportation) EPA (Environmental Protection Agency)	$393,037,618	0.4%	Rank history: #36 in FY2022, #33 in FY2023, #30 in FY2024 and #43 in FY2025; up 26 since FY2020.
39	Kpmg L.L.P. 2 awardees Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) HHS (Department of Health and Human Services)	$385,568,041	0.4%	Rank history: #44 in FY2022, #44 in FY2023, #40 in FY2024 and #41 in FY2025; up 23 since FY2020.
40	Ernst & Young LLP 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$382,545,659	0.4%	Rank history: #51 in FY2022, #40 in FY2023, #34 in FY2024 and #36 in FY2025; up 12 since FY2020.
41	Mvm, Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$365,947,080	0.3%	Rank history: #35 in FY2022 and not on the FY2023–FY2025 lists; up 153 since FY2020.
42	AECOM 15 awardees, including JT4 LLC, AECOM Technical Services, Inc. and AECOM Services, LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) Navy (Department of the Navy)	$363,598,186	0.3%	Rank history: #49 in FY2022, #32 in FY2023, #59 in FY2024 and not on the FY2025 list; down 28 since FY2020.
43	Nelnet Servicing LLC 3 awardees, including Great Lakes Educational Loan Services, Inc. and Peterson's, LLC Top agencies ED (Department of Education) DHRA (Defense Human Resources Activity)	$348,203,817	0.3%	Rank history: #42 in FY2022, #46 in FY2023, #43 in FY2024 and #39 in FY2025; unchanged since FY2020.
44	Torch Technologies Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$347,457,279	0.3%	Rank history: #69 in FY2022, #49 in FY2023, #52 in FY2024 and #42 in FY2025; down 13 since FY2020.
45	ICF International, Inc. 5 awardees, including ICF Incorporated, L.L.C., ICF Macro Inc. and Incentive Technology Group LLC Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) EPA (Environmental Protection Agency)	$346,749,209	0.3%	Rank history: #48 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
46	ABT Global LLC 2 awardees Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) ED (Department of Education)	$340,859,404	0.3%	Rank history: #55 in FY2022, #64 in FY2023, #62 in FY2024 and #70 in FY2025; up 3 since FY2020.
47	America's Blood Centers Top agencies HHS (Department of Health and Human Services)	$325,195,248	0.3%	Rank history: not on the FY2022–FY2025 lists; up 35 since FY2020.
48	International Business Machines Corporation 7 awardees Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) Army (Department of the Army)	$324,323,640	0.3%	Rank history: #50 in FY2022, #57 in FY2023, #60 in FY2024 and #61 in FY2025; up 24 since FY2020.
49	Nana Regional Corporation Inc 20 awardees, including Rivertech LLC, Akima Support Operations, LLC and Tuvli LLC Top agencies DOS (Department of State) Army (Department of the Army) USAF (Department of the Air Force)	$321,657,218	0.3%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
50	Logistics Management Institute 2 awardees, including The Tauri Group, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) OSD (Office of the Secretary of Defense)	$315,813,161	0.3%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
51	Highlight Technologies, LLC Top agencies SBA (Small Business Administration) USAID (US Agency for International Development) HHS (Department of Health and Human Services)	$312,648,780	0.3%	Rank history: not on the FY2022–FY2025 lists; up 43 since FY2020.
52	Research Triangle Institute 2 awardees, including International Resources Group Ltd. Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) EPA (Environmental Protection Agency)	$311,047,444	0.3%	Rank history: #58 in FY2022, #50 in FY2023, #42 in FY2024 and #75 in FY2025; up 5 since FY2020.
53	Carrington Mortgage Services LLC Top agencies HUD (Department of Housing and Urban Development)	$305,070,658	0.3%	Rank history: not on the FY2022–FY2023 lists, #25 in FY2024 and not on the FY2025 list; down 6 since FY2020.
54	Selene Finance LP Top agencies HUD (Department of Housing and Urban Development)	$297,712,832	0.3%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
55	Arctic Slope Regional Corporation 17 awardees, including Arctic Slope Technical Services, Inc., Asrc Federal System Solutions LLC and Asrc Federal Cyber, LLC Top agencies NASA (National Aeronautics and Space Administration) DOT (Department of Transportation) USAF (Department of the Air Force)	$290,989,056	0.3%	Rank history: #61 in FY2022, #70 in FY2023, #55 in FY2024 and #21 in FY2025; up 30 since FY2020.
56	The GEO Group, Inc. 2 awardees, including B.i. Incorporated Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$285,755,254	0.3%	Rank history: #45 in FY2022, #38 in FY2023, #46 in FY2024 and #50 in FY2025; down 10 since FY2020.
57	Oasis Systems, LLC Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) Navy (Department of the Navy)	$285,740,264	0.3%	Rank history: #41 in FY2022, #67 in FY2023, #89 in FY2024 and #67 in FY2025; up 11 since FY2020.
58	HP Enterprise Services LLC 19 awardees, including Peraton Inc., Peraton Government Communications Inc. and Peraton Risk Decision Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) Army (Department of the Army)	$282,622,557	0.3%	Rank history: #21 in FY2022, #14 in FY2023, #67 in FY2024 and not on the FY2025 list; up 72 since FY2020.
59	Fedex Corp 9 awardees, including Fedex Supply Chain Distribution System, Inc., Federal Express Corporation and Fedex Office and Print Services, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USDA (Department of Agriculture)	$270,358,795	0.2%	Rank history: #60 in FY2022, #52 in FY2023, #50 in FY2024 and #38 in FY2025; up 18 since FY2020.
60	Ingenesis Inc. 2 awardees, including Kelly Services, Inc. Top agencies HHS (Department of Health and Human Services) EEOC (Equal Employment Opportunity Commission)	$270,185,254	0.2%	Rank history: #71 in FY2022, #78 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
61	Microsoft Corporation 3 awardees, including Linkedin Corporation and Github Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$268,717,021	0.2%	Rank history: #63 in FY2022, #65 in FY2023, #48 in FY2024 and #49 in FY2025; down 20 since FY2020.
62	DAI Global LLC 2 awardees Top agencies USAID (US Agency for International Development)	$267,845,845	0.2%	Rank history: #52 in FY2022, #42 in FY2023, #39 in FY2024 and #62 in FY2025; down 3 since FY2020.
63	Colsa Corp Top agencies USAF (Department of the Air Force) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$263,534,496	0.2%	Rank history: not on the FY2022–FY2024 lists and #100 in FY2025; down 8 since FY2020.
64	Fors Marsh Group LLC Top agencies HHS (Department of Health and Human Services) DHRA (Defense Human Resources Activity) Army (Department of the Army)	$251,521,042	0.2%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; down 16 since FY2020.
65	The Boston Consulting Group Inc 2 awardees, including BCG Federal Corp. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy) USAF (Department of the Air Force)	$246,094,650	0.2%	Rank history: #88 in FY2022, #48 in FY2023, #87 in FY2024 and not on the FY2025 list; up 10 since FY2020.
66	CGI Technologies and Solutions Inc. 3 awardees, including CGI Federal Inc. Top agencies DOS (Department of State) DOJ (Department of Justice) Navy (Department of the Navy)	$231,990,182	0.2%	Rank history: #43 in FY2022, #37 in FY2023, #91 in FY2024 and not on the FY2025 list; down 10 since FY2020.
67	Riverside Research Institute 2 awardees, including Applied Research Solutions, Inc. Top agencies USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service) OSD (Office of the Secretary of Defense)	$230,922,947	0.2%	Rank history: #73 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
68	Pennsylvania Commonwealth of 7 awardees, including Pennslyvania Higher Education Assistance Agency, Pennsylvania Department of Health and Pennsylvania Human Relations Commission Top agencies ED (Department of Education) HHS (Department of Health and Human Services) EEOC (Equal Employment Opportunity Commission)	$227,841,267	0.2%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
69	Huntington Ingalls Industries, Inc. 9 awardees, including HII Mission Technologies Corp, HII Fleet Support Group LLC and Fulcrum It Services, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) USSOCOM (United States Special Operations Command)	$227,315,318	0.2%	Rank history: #29 in FY2022, #27 in FY2023, #16 in FY2024 and #17 in FY2025; unchanged since FY2020.
70	Aaski Technology Inc. 7 awardees, including Mag DS Corp, Ausley Associates, Inc. and North American Surveillance Systems, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$224,417,774	0.2%	Rank history: #54 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
71	Range Generation Next LLC Top agencies USAF (Department of the Air Force)	$222,303,088	0.2%	Rank history: #82 in FY2022, #68 in FY2023, #80 in FY2024 and not on the FY2025 list; up 29 since FY2020.
72	Mathematica Inc 2 awardees Top agencies HHS (Department of Health and Human Services) ED (Department of Education) DOL (Department of Labor)	$221,230,960	0.2%	Rank history: #77 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
73	DCS Corporation 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$213,225,330	0.2%	Rank history: #76 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
74	H.i.g. Capital Management Inc. 5 awardees, including Iron Bow Technologies, LLC, Empower AI, Inc. and Lionbridge Global Solutions II Inc. Top agencies VA (Department of Veterans Affairs) OSD (Office of the Secretary of Defense) HHS (Department of Health and Human Services)	$212,808,321	0.2%	Rank history: #72 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; up 150 since FY2020.
75	Westat, Inc. Top agencies HHS (Department of Health and Human Services) ED (Department of Education) USDA (Department of Agriculture)	$207,609,473	0.2%	Rank history: #70 in FY2022, #85 in FY2023, #69 in FY2024 and not on the FY2025 list; up 12 since FY2020.
76	Credence Management Solutions Limited Liability Company Top agencies USAF (Department of the Air Force) USAID (US Agency for International Development) Army (Department of the Army)	$205,892,190	0.2%	Rank history: #67 in FY2022, #54 in FY2023, #33 in FY2024 and #60 in FY2025; up 3 since FY2020.
77	Noblis, Inc. 2 awardees, including Noblis MSD LLC Top agencies DOT (Department of Transportation) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$204,610,746	0.2%	Rank history: #56 in FY2022, #53 in FY2023, #63 in FY2024 and #66 in FY2025; up 18 since FY2020.
78	Linquest Corporation 2 awardees, including The Perduco Group, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$204,126,785	0.2%	Rank history: #98 in FY2022, #88 in FY2023, #95 in FY2024 and #76 in FY2025; up 13 since FY2020.
79	Vera Institute of Justice, Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$198,151,979	0.2%	Rank history: #78 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 65 since FY2020.
80	Nippon Telegraph and Telephone Corporation 3 awardees, including NTT Data Federal Services, Inc., NTT Data Services Federal Government, LLC and Docomo Pacific, Inc. Top agencies DOJ (Department of Justice) USAID (US Agency for International Development) Navy (Department of the Navy)	$194,360,165	0.2%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; up 38 since FY2020.
81	Navient Corporation 2 awardees, including Pioneer Credit Recovery, Inc. Top agencies ED (Department of Education) Treasury (Department of the Treasury)	$190,803,959	0.2%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
82	Young & Rubicam Inc. 6 awardees, including Wunderman Thompson LLC, Ogilvy Public Relations Worldwide LLC and Kantar Belgium Top agencies Navy (Department of the Navy) Commerce (Department of Commerce) HHS (Department of Health and Human Services)	$190,795,124	0.2%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; down 29 since FY2020.
83	Axient LLC 3 awardees, including Systems Engineering Group, Inc. and Dynamic Concepts LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$189,320,057	0.2%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
84	Grant Thornton International Ltd 2 awardees, including Grant Thornton LLP and Grant Thornton Public Sector LLC Top agencies DHS (Department of Homeland Security) DOS (Department of State) Commerce (Department of Commerce)	$187,662,517	0.2%	Rank history: #75 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2020.
85	Michael Baker International, LLC 3 awardees, including Sallyport Global Holdings Inc. Top agencies USAF (Department of the Air Force) DOS (Department of State) EPA (Environmental Protection Agency)	$185,441,796	0.2%	Rank history: #57 in FY2022, #55 in FY2023, #66 in FY2024 and not on the FY2025 list; down 41 since FY2020.
86	Koniag, Inc. 11 awardees, including Tuknik Government Services LLC, Pacarctic, LLC and Eagle Harbor Solutions LLC Top agencies DISA (Defense Information Systems Agency) USDA (Department of Agriculture) DOS (Department of State)	$180,770,176	0.2%	Rank history: #74 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 59 since FY2020.
87	Smartronix LLC 2 awardees, including Datastrong, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DOJ (Department of Justice)	$176,849,718	0.2%	Rank history: #62 in FY2022, #63 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
88	On Assignment, Inc. 5 awardees, including ECS Federal, LLC, Inforeliance LLC and Indrasoft Inc. Top agencies DOJ (Department of Justice) DARPA (Defense Advanced Research Projects Agency) Commerce (Department of Commerce)	$173,411,180	0.2%	Rank history: #93 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; up 102 since FY2020.
89	ACE Info Solutions LLC 2 awardees, including Dovel Technologies LLC and Guidehouse Digital LLC Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) USDA (Department of Agriculture)	$165,572,553	0.2%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; up 81 since FY2020.
90	Securitas AB 3 awardees, including Securitas Critical Infrastructure Services, Inc., Paragon Systems Inc. and Securitas Electronic Security, Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency) DOJ (Department of Justice) HHS (Department of Health and Human Services)	$162,791,217	0.1%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 154 since FY2020.
91	Rolls-Royce Military Aero Engines Ltd 4 awardees, including Rolls-Royce Corporation, Rolls-Royce Marine North America Inc. and Rolls-Royce Solutions America Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$158,953,884	0.1%	Rank history: #68 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
92	Kearney & Company, P.C. Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$157,618,725	0.1%	Rank history: #87 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
93	Aitc-Five Domains Joint Venture,Llc Top agencies Army (Department of the Army)	$154,449,809	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Intuitive Research and Technology Corporation 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$152,824,400	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
95	Xator LLC 3 awardees, including TSM LLC and Incadence Strategic Solutions LLC Top agencies DOS (Department of State) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$152,472,311	0.1%	Rank history: not on the FY2022–FY2025 lists; up 38 since FY2020.
96	BAE Systems Land & Armaments L.P. 10 awardees, including BAE Systems Information and Electronic Systems Integration Inc. and BAE Systems Technology Solutions & Services Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOJ (Department of Justice)	$152,304,167	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	T-Rex Solutions LLC Top agencies Commerce (Department of Commerce)	$149,783,728	0.1%	Rank history: not on the FY2022–FY2025 lists; down 70 since FY2020.
98	Afognak Native Corporation 19 awardees, including Alutiiq Essential Services LLC, Alutiiq Information Management, LLC and Alutiiq Advanced Security Solutions LLC Top agencies DOS (Department of State) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$148,152,273	0.1%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
99	Cognosante Holdings, LLC 3 awardees, including Cognosante, LLC, Cognosante MVH LLC and Cognosante Cds, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) SSA (Social Security Administration)	$145,831,663	0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 158 since FY2020.
100	Sev1Tech, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$145,488,936	0.1%	Rank history: not on the FY2022 list, #90 in FY2023, not on the FY2024 list and #71 in FY2025; up 13 since FY2020.

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100 of 17,105 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC R

Code	Net obligations	Largest contractor
R4 Professional Services	$73,439,519,257	Booz Allen Hamilton Holding Corporation
R7 Management Support Services	$21,717,652,478	Kbr, Inc.
R6 Administrative Support Services	$6,727,638,330	Mckesson Corporation

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 $109 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 R contractors in FY2021?

1. Kbr, Inc. ($3.2B), 2. Booz Allen Hamilton Holding Corporation ($3.02B), 3. The Boeing Company ($2.35B), 4. Lockheed Martin Corporation ($2.3B), 5. General Dynamics Corporation ($2.16B), 6. Deloitte LLP ($1.93B), 7. RTX Corporation ($1.87B), 8. Chemonics International, Inc. ($1.59B), 9. Northrop Grumman Corporation ($1.54B), 10. Mckesson Corporation ($1.52B).

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