Top 100 Contractors in PSC R4: Professional Services, FY2024

Name: Top 100 Contractors in PSC R4: Professional Services, FY2024
Creator: GovTribe

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

The top 10 won 19% of FY2024 PSC R4 contract dollars

Contract obligations: $89,260,279,566 Net of deobligations, by contracts coded PSC R4 or a code under it
Contractors: 12,867 Parent companies with an obligation
Largest contractor: Booz Allen Hamilton Holding Corporation $3.39 billion, 3.6% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Booz Allen Hamilton Holding Corporation 12 awardees, including Booz Allen Hamilton Inc., Thunderyard Liberty JV LLC and Aquilent, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$3,388,776,408	3.6%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2025; unchanged since FY2023.
2	The Boeing Company 35 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army) USSOCOM (United States Special Operations Command)	$2,547,875,862	2.7%	Rank history: #2 in FY2021, #3 in FY2022, #2 in FY2023 and #2 in FY2025; unchanged since FY2023.
3	General Dynamics Corporation 28 awardees, including General Dynamics Information Technology, Inc., General Dynamics Land Systems Inc. and General Dynamics Mission Systems, Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$2,132,429,828	2.2%	Rank history: #5 in FY2021, #4 in FY2022, #3 in FY2023 and #4 in FY2025; unchanged since FY2023.
4	Deloitte 8 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) DOS (Department of State)	$1,863,189,004	2.0%	Rank history: #6 in FY2021, #11 in FY2022, #11 in FY2023 and #6 in FY2025; up 7 since FY2023.
5	Science Applications International Corporation 9 awardees, including Forfeiture Support Associates LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOS (Department of State)	$1,491,162,353	1.6%	Rank history: #7 in FY2021, #5 in FY2022, #4 in FY2023 and #7 in FY2025; down 1 since FY2023.
6	Lockheed Martin Corporation 33 awardees, including Lockheed Martin Services, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$1,482,368,060	1.6%	Rank history: #11 in FY2021, #7 in FY2022, #5 in FY2023 and #5 in FY2025; down 1 since FY2023.
7	CACI International Inc. 13 awardees, including Caci, Inc. - Federal, Caci Technologies, LLC and Caci Nss, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,476,107,299	1.6%	Rank history: #13 in FY2021, #10 in FY2022, #6 in FY2023 and #3 in FY2025; down 1 since FY2023.
8	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$1,456,096,425	1.5%	Rank history: #4 in FY2021, #6 in FY2022, #8 in FY2023 and #13 in FY2025; unchanged since FY2023.
9	Leidos Holdings, Inc. 24 awardees, including Leidos, Inc. and Aranea Solutions Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) USAF (Department of the Air Force)	$1,369,194,216	1.4%	Rank history: #9 in FY2021, #12 in FY2022, #10 in FY2023 and #10 in FY2025; up 1 since FY2023.
10	Northrop Grumman Corporation 48 awardees, including Northrop Grumman Systems Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army) OSD (Office of the Secretary of Defense)	$1,219,478,497	1.3%	Rank history: #8 in FY2021, #9 in FY2022, #7 in FY2023 and #9 in FY2025; down 3 since FY2023.
11	The Aerospace Corporation Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) DOI (Department of the Interior)	$1,181,033,997	1.2%	Rank history: #12 in FY2021, #13 in FY2022, #9 in FY2023 and #11 in FY2025; down 2 since FY2023.
12	Huntington Ingalls Industries, Inc. 8 awardees, including HII Mission Technologies Corp, HII Technical Solutions Corporation and HII Fleet Support Group LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$980,706,374	1.0%	Rank history: #54 in FY2021, #27 in FY2022, #21 in FY2023 and #14 in FY2025; up 9 since FY2023.
13	RTX Corporation 47 awardees, including Raytheon Company and Rockwell Collins, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$950,494,102	1.0%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2025; up 264 since FY2023.
14	The Mitre Corporation 3 awardees Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) Treasury (Department of the Treasury)	$929,450,566	1.0%	Rank history: #15 in FY2021, #14 in FY2022, #12 in FY2023 and #20 in FY2025; down 2 since FY2023.
15	Olin Corporation 2 awardees, including Olin Winchester LLC Top agencies Army (Department of the Army)	$910,827,320	1.0%	Rank history: not on the FY2021–FY2023 lists and #41 in FY2025; new.
16	Savannah River Mission Completion, LLC Top agencies DOE (Department of Energy)	$885,649,780	0.9%	Rank history: not on the FY2021 list, #19 in FY2022, #16 in FY2023 and #15 in FY2025; unchanged since FY2023.
17	Accenture Federal Services LLC 4 awardees, including Accenture LLP Top agencies Treasury (Department of the Treasury) VA (Department of Veterans Affairs) ED (Department of Education)	$849,034,056	0.9%	Rank history: not on the FY2021–FY2023 lists and #19 in FY2025; new.
18	Serco Inc 3 awardees, including Serco-Ips Corporation and Whitney Bradley & Brown, Inc. Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services) PBGC (Pension Benefit Guaranty Corporation)	$812,252,831	0.9%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #18 in FY2025; up 26 since FY2023.
19	Parsons Corporation 6 awardees, including Parsons Government Services Inc., Xator LLC and Parsons Government Services International Inc. Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency) Navy (Department of the Navy)	$777,880,860	0.8%	Rank history: #22 in FY2021, #22 in FY2022, #19 in FY2023 and #17 in FY2025; unchanged since FY2023.
20	Maximus Federal Services, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) Treasury (Department of the Treasury)	$752,171,304	0.8%	Rank history: not on the FY2021–FY2023 lists and #16 in FY2025; new.
21	Carrington Mortgage Services LLC Top agencies HUD (Department of Housing and Urban Development)	$731,003,456	0.8%	Rank history: #37 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
22	Amentum Services, Inc. 12 awardees, including JT4 LLC, PAE Government Services, Inc. and PAE Labat-Anderson LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$728,303,001	0.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
23	BAE Systems 21 awardees, including BAE Systems Information and Electronic Systems Integration Inc., BAE Systems Technology Solutions & Services Inc. and BAE Systems Land & Armaments L.P. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$612,398,393	0.6%	Rank history: #25 in FY2021, #20 in FY2022, #15 in FY2023 and #21 in FY2025; down 8 since FY2023.
24	L3Harris Technologies, Inc. 32 awardees, including L3Harris Technologies Integrated Systems L.P. and L3 Technologies, Inc. Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) USSOCOM (United States Special Operations Command)	$577,865,032	0.6%	Rank history: #17 in FY2021, #16 in FY2022, #17 in FY2023 and #23 in FY2025; down 7 since FY2023.
25	Tetra Tech, Inc. 24 awardees, including Ard, Inc., Management Systems International, Inc. and LS Technologies LLC Top agencies USAID (US Agency for International Development) DOT (Department of Transportation) DOS (Department of State)	$552,407,465	0.6%	Rank history: #28 in FY2021, #26 in FY2022, #27 in FY2023 and #34 in FY2025; up 2 since FY2023.
26	Caci Technologies LLC 7 awardees, including Caci, Inc. - Federal, Caci Nss, LLC and Caci Enterprise Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$481,256,761	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
27	Guidehouse Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) DOJ (Department of Justice)	$477,641,986	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
28	DAI Global LLC Top agencies USAID (US Agency for International Development)	$455,770,229	0.5%	Rank history: #43 in FY2021, #37 in FY2022, #30 in FY2023 and #48 in FY2025; up 2 since FY2023.
29	Jacobs Government Services Company 11 awardees, including Amentum Technology, Inc., Ch2M Hill - CDM Pa-Tac Recovery Services and Jacobs Engineering Group Inc. Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$440,444,013	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
30	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) DOJ (Department of Justice)	$427,065,189	0.5%	Rank history: #39 in FY2021, #46 in FY2022, #39 in FY2023 and #60 in FY2025; up 9 since FY2023.
31	Peraton Inc. 2 awardees, including Peraton Enterprise Solutions LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) HHS (Department of Health and Human Services)	$423,400,860	0.4%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2025; new.
32	KBR Wyle Services LLC 8 awardees, including KBR Services, LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) Navy (Department of the Navy)	$419,438,908	0.4%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2025; new.
33	Smartronix, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$394,832,273	0.4%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2025; new.
34	The GEO Group, Inc. 2 awardees, including B.i. Incorporated Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$381,851,552	0.4%	Rank history: #42 in FY2021, #31 in FY2022, #29 in FY2023 and #40 in FY2025; down 5 since FY2023.
35	Acacia Center for Justice Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$381,370,270	0.4%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2025; up 195 since FY2023.
36	Microsoft Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$380,113,897	0.4%	Rank history: #45 in FY2021, #49 in FY2022, #50 in FY2023 and #39 in FY2025; up 14 since FY2023.
37	Family Endeavors, Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$360,954,816	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
38	LMI Consulting, LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army) HHS (Department of Health and Human Services)	$310,231,141	0.3%	Rank history: not on the FY2021 list, #68 in FY2022, #74 in FY2023 and #45 in FY2025; up 36 since FY2023.
39	The Interpublic Group of Companies Inc 2 awardees, including IPG Dxtra, Inc. Top agencies HHS (Department of Health and Human Services)	$307,473,290	0.3%	Rank history: #27 in FY2021, #36 in FY2022, #31 in FY2023 and not on the FY2025 list; down 8 since FY2023.
40	General Atomic Technologies Corporation 5 awardees, including General Atomics Aeronautical Systems, Inc. and General Atomics Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$303,599,216	0.3%	Rank history: #26 in FY2021, #33 in FY2022, #37 in FY2023 and not on the FY2025 list; down 3 since FY2023.
41	SRC Inc. 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$299,421,898	0.3%	Rank history: not on the FY2021 list, #96 in FY2022, #65 in FY2023 and #58 in FY2025; up 24 since FY2023.
42	AECOM 8 awardees, including JT4 LLC, AECOM Services, LLC and AECOM Usa, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) Army (Department of the Army)	$289,830,899	0.3%	Rank history: #30 in FY2021, #34 in FY2022, #26 in FY2023 and not on the FY2025 list; down 16 since FY2023.
43	CGI Federal Inc. Top agencies DOS (Department of State) DHS (Department of Homeland Security) GSA (General Services Administration)	$288,882,007	0.3%	Rank history: not on the FY2021–FY2023 lists and #30 in FY2025; new.
44	UnitedHealth Group Incorporated 6 awardees, including Optumrx Administrative Services, LLC, Optumhealth Care Solutions, LLC and The Lewin Group, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$285,976,297	0.3%	Rank history: #90 in FY2021, #75 in FY2022, not on the FY2023 list and #38 in FY2025; up 77 since FY2023.
45	ABT Global LLC 3 awardees Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) ED (Department of Education)	$284,799,283	0.3%	Rank history: #32 in FY2021, #40 in FY2022, #48 in FY2023 and #56 in FY2025; up 3 since FY2023.
46	Torch Technologies Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$273,793,560	0.3%	Rank history: #31 in FY2021, #51 in FY2022, #43 in FY2023 and #37 in FY2025; down 3 since FY2023.
47	Mantech International Corporation 7 awardees, including Mantech Advanced Systems International, Inc., Mantech SRS Technologies, Inc. and Tapestry Technologies, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOS (Department of State)	$267,048,468	0.3%	Rank history: #18 in FY2021, #18 in FY2022, #42 in FY2023 and #33 in FY2025; down 5 since FY2023.
48	Arctic Slope Regional Corporation 16 awardees, including Asrc Federal Professional Services, LLC, Asrc Federal System Solutions LLC and Netcentric Technology, LLC Top agencies DCSA (Defense Counterintelligence and Security Agency) DOT (Department of Transportation) USAF (Department of the Air Force)	$259,746,258	0.3%	Rank history: #48 in FY2021, #53 in FY2022, #64 in FY2023 and #26 in FY2025; up 16 since FY2023.
49	Credence Management Solutions Limited Liability Company Top agencies USAID (US Agency for International Development) USAF (Department of the Air Force) DOJ (Department of Justice)	$259,394,273	0.3%	Rank history: #68 in FY2021, #57 in FY2022, #52 in FY2023 and #55 in FY2025; up 3 since FY2023.
50	International Business Machines Corporation 7 awardees Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) DMEA (Defense Microelectronics Activity)	$257,985,012	0.3%	Rank history: #47 in FY2021, #44 in FY2022, #49 in FY2023 and #52 in FY2025; down 1 since FY2023.
51	Michael Baker International, LLC 2 awardees, including Sallyport Global Holdings Inc. Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$249,609,464	0.3%	Rank history: #60 in FY2021, #43 in FY2022, #40 in FY2023 and not on the FY2025 list; down 11 since FY2023.
52	Carahsoft Technology Corp Top agencies HHS (Department of Health and Human Services) DOE (Department of Energy) DOI (Department of the Interior)	$245,886,762	0.3%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and #65 in FY2025; up 42 since FY2023.
53	Systems Planning and Analysis, Inc. Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense) DTRA (Defense Threat Reduction Agency)	$235,214,448	0.2%	Rank history: #93 in FY2021, #78 in FY2022, #60 in FY2023 and #42 in FY2025; up 7 since FY2023.
54	Westat, Inc. 2 awardees, including Insight Policy Research, Inc. Top agencies HHS (Department of Health and Human Services) ED (Department of Education) DOT (Department of Transportation)	$233,112,207	0.2%	Rank history: #77 in FY2021, #60 in FY2022, #77 in FY2023 and not on the FY2025 list; up 23 since FY2023.
55	Odyssey Systems Consulting Group Ltd. Top agencies USAF (Department of the Air Force)	$222,677,545	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
56	General Dynamics Global Force, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$215,204,198	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
57	Leonardo S.p.A. 8 awardees, including DRS Network & Imaging Systems LLC, DRS Sustainment Systems, Inc. and Laurel Technologies Partnership Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$214,507,330	0.2%	Rank history: #85 in FY2021, #88 in FY2022, #41 in FY2023 and #31 in FY2025; down 16 since FY2023.
58	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)	$213,052,223	0.2%	Rank history: #62 in FY2021, #50 in FY2022, #46 in FY2023 and #63 in FY2025; down 12 since FY2023.
59	BAE Systems Land & Armaments L.P. Top agencies Army (Department of the Army)	$204,684,927	0.2%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2025; new.
60	Oasis Systems, LLC 2 awardees Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$195,281,005	0.2%	Rank history: #86 in FY2021, #48 in FY2022, #62 in FY2023 and #53 in FY2025; up 2 since FY2023.
61	Semanticbits LLC 4 awardees, including ICF Incorporated, L.L.C. and Incentive Technology Group LLC Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency) DOJ (Department of Justice)	$190,859,096	0.2%	Rank history: not on the FY2021–FY2023 lists and #79 in FY2025; new.
62	V2X, Inc. 4 awardees, including V2X Aerospace LLC, V2X Systems LLC and Vectrus Systems LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DOS (Department of State)	$189,847,805	0.2%	Rank history: not on the FY2021–FY2023 lists and #27 in FY2025; new.
63	Range Generation Next LLC Top agencies USAF (Department of the Air Force)	$186,574,863	0.2%	Rank history: #51 in FY2021, #61 in FY2022, #51 in FY2023 and not on the FY2025 list; down 12 since FY2023.
64	Scientific Research Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$185,595,754	0.2%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2025; up 47 since FY2023.
65	Ernst & Young LLP 2 awardees Top agencies Army (Department of the Army) DOJ (Department of Justice) USAF (Department of the Air Force)	$180,933,047	0.2%	Rank history: not on the FY2021–FY2023 lists and #49 in FY2025; new.
66	The Boston Consulting Group Inc 2 awardees, including BCG Federal Corp. Top agencies DHA (Defense Health Agency) Navy (Department of the Navy) Army (Department of the Army)	$179,517,489	0.2%	Rank history: #49 in FY2021, #66 in FY2022, #36 in FY2023 and not on the FY2025 list; down 30 since FY2023.
67	Deloitte Consulting LLP 2 awardees Top agencies Treasury (Department of the Treasury) USAF (Department of the Air Force) DHA (Defense Health Agency)	$175,405,627	0.2%	Rank history: not on the FY2021 list, #21 in FY2022, #20 in FY2023 and not on the FY2025 list; down 47 since FY2023.
68	Signature Choice II, LLC Top agencies VA (Department of Veterans Affairs)	$164,457,790	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
69	Anduril Industries Inc. Top agencies USSOCOM (United States Special Operations Command) Navy (Department of the Navy) USAF (Department of the Air Force)	$160,329,848	0.2%	Rank history: not on the FY2021–FY2023 lists and #94 in FY2025; up 117 since FY2023.
70	Linquest Corporation Top agencies USAF (Department of the Air Force)	$158,807,638	0.2%	Rank history: #69 in FY2021, #86 in FY2022, #70 in FY2023 and #62 in FY2025; unchanged since FY2023.
71	Iron Bow Technologies, LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$158,415,253	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
72	Applied Research Associates, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DTRA (Defense Threat Reduction Agency)	$157,525,260	0.2%	Rank history: not on the FY2021 list, #73 in FY2022, #56 in FY2023 and #76 in FY2025; down 16 since FY2023.
73	The Johns Hopkins University Applied Physics Laboratory LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) DHS (Department of Homeland Security)	$144,178,691	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
74	The Cadmus Group LLC 2 awardees Top agencies USAID (US Agency for International Development) EPA (Environmental Protection Agency) DHS (Department of Homeland Security)	$143,904,157	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 55 since FY2023.
75	Precise Systems, Inc. Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency)	$134,165,554	0.1%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and #87 in FY2025; up 11 since FY2023.
76	BCG Federal Corp. Top agencies DHA (Defense Health Agency) Navy (Department of the Navy) OPM (Office of Personnel Management)	$130,969,271	0.1%	Rank history: not on the FY2021–FY2023 lists and #47 in FY2025; new.
77	Fluor Corporation 2 awardees, including Fluor Federal Services Inc. Top agencies DHS (Department of Homeland Security)	$128,830,100	0.1%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023 and #54 in FY2025; up 14 since FY2023.
78	Amentum Holdings, Inc. 6 awardees, including Amentum Services, Inc., JT4 LLC and PAE Government Services, Inc. Top agencies Navy (Department of the Navy) DOS (Department of State) USAF (Department of the Air Force)	$128,572,475	0.1%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2025; new.
79	Sigmatech Inc. 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$127,445,692	0.1%	Rank history: not on the FY2021–FY2023 lists and #73 in FY2025; up 55 since FY2023.
80	Sev1Tech, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$126,618,180	0.1%	Rank history: #76 in FY2021, #82 in FY2022, #73 in FY2023 and #57 in FY2025; down 7 since FY2023.
81	Space Network Solutions LLC Top agencies NASA (National Aeronautics and Space Administration)	$125,314,492	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
82	Mag DS Corp Top agencies Army (Department of the Army) DISA (Defense Information Systems Agency)	$124,115,920	0.1%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2025; new.
83	DCS Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$122,109,789	0.1%	Rank history: #53 in FY2021, #54 in FY2022, #54 in FY2023 and #92 in FY2025; down 29 since FY2023.
84	American Institutes for Research In the Behavioral Sciences 2 awardees Top agencies ED (Department of Education) HHS (Department of Health and Human Services) Army (Department of the Army)	$121,389,749	0.1%	Rank history: not on the FY2021 list, #97 in FY2022, #93 in FY2023 and not on the FY2025 list; up 9 since FY2023.
85	Bell Boeing Joint Project Office Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$120,662,998	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	BC Partners LLP Through Gardaworld Federal Services LLC Top agencies DOS (Department of State)	$120,018,533	0.1%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2025; up 23 since FY2023.
87	Kbr, Inc. 8 awardees, including KBR Wyle Services, LLC and Dependable Global Solutions, LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) DOT (Department of Transportation)	$119,883,202	0.1%	Rank history: #24 in FY2021, #28 in FY2022, #24 in FY2023 and not on the FY2025 list; down 63 since FY2023.
88	Dawson's Realty & Mortgages, Inc. Top agencies USDA (Department of Agriculture)	$118,875,230	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 78 since FY2023.
89	Deployed Services, LLC Top agencies HHS (Department of Health and Human Services)	$117,634,847	0.1%	Rank history: not on the FY2021–FY2022 lists, #55 in FY2023 and not on the FY2025 list; down 34 since FY2023.
90	Cognosante Holdings, LLC 3 awardees, including Cognosante MVH LLC and Cognosante, LLC Top agencies HHS (Department of Health and Human Services) SSA (Social Security Administration) VA (Department of Veterans Affairs)	$117,179,169	0.1%	Rank history: #75 in FY2021, #69 in FY2022, #87 in FY2023 and not on the FY2025 list; down 3 since FY2023.
91	Energy Technology Alliance LLC Top agencies DOE (Department of Energy)	$117,088,826	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
92	E.f. Kearney, Limited 2 awardees, including Kearney & Company, P.C. Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) OSD (Office of the Secretary of Defense)	$116,556,775	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
93	Kpmg LLP Top agencies HHS (Department of Health and Human Services) DCSA (Defense Counterintelligence and Security Agency) USAF (Department of the Air Force)	$116,536,288	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
94	Heritage Health Solutions Inc. Top agencies DOJ (Department of Justice)	$116,420,706	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
95	Parsons Government Services Inc. Top agencies MDA (DOD Missile Defense Agency) Navy (Department of the Navy) Army (Department of the Army)	$115,019,996	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
96	Colsa Corp Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$113,576,222	0.1%	Rank history: #46 in FY2021, #90 in FY2022, not on the FY2023 list and not on the FY2025 list; up 12 since FY2023.
97	Inter-CON Security Systems Inc. Top agencies DOS (Department of State) DOJ (Department of Justice)	$113,113,737	0.1%	Rank history: not on the FY2021–FY2023 lists and #70 in FY2025; new.
98	Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force)	$112,009,490	0.1%	Rank history: not on the FY2021–FY2023 lists and #85 in FY2025; new.
99	Palantir Technologies Inc. 2 awardees, including Palantir USG Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$110,323,416	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 291 since FY2023.
100	Great Hill Solutions, LLC Top agencies DOS (Department of State) DSCA (Defense Security Cooperation Agency) DHA (Defense Health Agency)	$100,520,173	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 116 since FY2023.

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100 of 12,867 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC R4

Code	Net obligations	Largest contractor
R425 Engineering and Technical Services	$34,468,681,143	Lockheed Martin Corporation
R499 Other Professional Services	$32,060,761,172	Booz Allen Hamilton Holding Corporation
R408 Program Management/Support Services	$14,045,210,098	Carrington Mortgage Services LLC
R426 Communications Services	$1,338,947,569	The Interpublic Group of Companies Inc
R410 Support – Professional: Program Evaluation/Review/Development	$1,121,708,998	Booz Allen Hamilton Holding Corporation
R430 Support – Professional: Physical Security and Badging	$956,291,611	BC Partners LLP
R418 Legal Services	$909,094,451	Acacia Center for Justice
R429 Support – Professional: Emergency Response/Disaster Planning/Preparedness Support	$725,319,135	Fluor Corporation
R405 Operations Research and Quantitative Analysis Services	$567,689,340	Leidos Holdings, Inc.
R431 Support – Professional: Human Resources	$515,842,716	Deloitte
R423 Intelligence Services	$433,216,667	Altamira Technologies Corporation
R497 Personal Services Contracts	$404,217,705	The Johns Hopkins University
R424 Expert Witness	$301,831,246	Georgia TECH Applied Research Corp
R422 Market Research and Public Opinion Services (includes telephone and field interviews, focus testing, and surveys)	$275,954,360	National Opinion Research Center
R406 Policy Review/Development Services	$214,682,970	Arrow Electronics, Inc.
R412 Simulation	$200,611,248	Northrop Grumman Corporation
R416 Veterinary/Animal Care Services	$115,309,165	Priority One Services, Inc.
R427 Weather Reporting/Observation Services	$108,367,053	Vero Technical Support Inc
R401 Personal Care Services (includes such services as barber and beauty shop, shoe repairs, tailoring, etc.)	$101,466,149	Dependable Health Services Inc
R420 Support – Professional: Certifications and Accreditations (Other Than Education or Information Technology C&A)	$69,331,345	Gzo, Inc.
R404 Land Surveys, Cadastral Services (non-construction)	$42,553,914	Straughan Environmental, Inc.
R402 Real Estate Brokerage Services	$38,791,263	Raine & Company, LLC
R411 Real Property Appraisals Services (SIC 6531)	$34,863,963	Verdi Consulting Inc
R498 Patent and Trademark Services	$29,368,950	Serco Inc
R428 Industrial Hygienics	$20,175,100	Perma-Fix Environmental Services, Inc.

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 $94.8 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2024 ran Oct 1, 2023 – Sep 30, 2024. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2023. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2023 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC R4 contractors in FY2024?

1. Booz Allen Hamilton Holding Corporation ($3.39B), 2. The Boeing Company ($2.55B), 3. General Dynamics Corporation ($2.13B), 4. Deloitte ($1.86B), 5. Science Applications International Corporation ($1.49B), 6. Lockheed Martin Corporation ($1.48B), 7. CACI International Inc. ($1.48B), 8. Chemonics International, Inc. ($1.46B), 9. Leidos Holdings, Inc. ($1.37B), 10. Northrop Grumman Corporation ($1.22B).

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