Top 100 Contractors in PSC R4: Professional Services, FY2025

Name: Top 100 Contractors in PSC R4: Professional Services, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 21% of FY2025 PSC R4 contract dollars

Contract obligations: $76,947,242,480 Net of deobligations, by contracts coded PSC R4 or a code under it
Contractors: 10,945 Parent companies with an obligation
Largest contractor: Booz Allen Hamilton Holding Corporation $3.3 billion, 3.8% 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 10 awardees, including Booz Allen Hamilton Inc., Ultra Electronics Advanced Tactical Systems Inc. and Thunderyard Liberty JV LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$3,298,335,037	3.8%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	The Boeing Company 23 awardees, including Boeing Sikorsky Aircraft Support, LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) Army (Department of the Army)	$2,483,786,265	2.9%	Rank history: #2 in FY2021, #3 in FY2022, #2 in FY2023 and #2 in FY2024; unchanged since FY2024.
3	CACI International Inc. 14 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)	$1,896,888,569	2.2%	Rank history: #13 in FY2021, #10 in FY2022, #6 in FY2023 and #7 in FY2024; up 4 since FY2024.
4	General Dynamics Corporation 26 awardees, including General Dynamics Information Technology, Inc., General Dynamics Land Systems Inc. and General Dynamics Global Force, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$1,767,840,258	2.1%	Rank history: #5 in FY2021, #4 in FY2022, #3 in FY2023 and #3 in FY2024; down 1 since FY2024.
5	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)	$1,501,514,054	1.7%	Rank history: #11 in FY2021, #7 in FY2022, #5 in FY2023 and #6 in FY2024; up 1 since FY2024.
6	Deloitte 3 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$1,479,684,635	1.7%	Rank history: #6 in FY2021, #11 in FY2022, #11 in FY2023 and #4 in FY2024; down 2 since FY2024.
7	Science Applications International Corporation 6 awardees, including Forfeiture Support Associates LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$1,469,810,807	1.7%	Rank history: #7 in FY2021, #5 in FY2022, #4 in FY2023 and #5 in FY2024; down 2 since FY2024.
8	Amentum Holdings, Inc. 18 awardees, including Amentum Services, Inc., JT4 LLC and Amentum Technology, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$1,449,025,048	1.7%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2024; up 70 since FY2024.
9	Northrop Grumman Corporation 39 awardees, including Northrop Grumman Systems Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$1,443,656,360	1.7%	Rank history: #8 in FY2021, #9 in FY2022, #7 in FY2023 and #10 in FY2024; up 1 since FY2024.
10	Leidos Holdings, Inc. 19 awardees, including Leidos, Inc., Hanford Mission Integration Solutions, LLC and Dynetics, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) USAF (Department of the Air Force)	$1,302,419,538	1.5%	Rank history: #9 in FY2021, #12 in FY2022, #10 in FY2023 and #9 in FY2024; down 1 since FY2024.
11	The Aerospace Corporation Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) DOT (Department of Transportation)	$1,248,942,456	1.5%	Rank history: #12 in FY2021, #13 in FY2022, #9 in FY2023 and #11 in FY2024; unchanged since FY2024.
12	RTX Corporation 47 awardees, including Raytheon Company, Range Generation Next LLC and Rockwell Collins, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$1,213,749,180	1.4%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2024; up 1 since FY2024.
13	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$1,209,847,139	1.4%	Rank history: #4 in FY2021, #6 in FY2022, #8 in FY2023 and #8 in FY2024; down 5 since FY2024.
14	Huntington Ingalls Industries, Inc. 7 awardees, including HII Mission Technologies Corp, HII Technical Solutions Corporation and HII Fleet Support Group LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,082,523,167	1.3%	Rank history: #54 in FY2021, #27 in FY2022, #21 in FY2023 and #12 in FY2024; down 2 since FY2024.
15	Savannah River Mission Completion, LLC Top agencies DOE (Department of Energy)	$1,062,510,600	1.2%	Rank history: not on the FY2021 list, #19 in FY2022, #16 in FY2023 and #16 in FY2024; up 1 since FY2024.
16	Maximus Federal Services, Inc. Top agencies HHS (Department of Health and Human Services)	$944,287,841	1.1%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2024; up 4 since FY2024.
17	Parsons Corporation 7 awardees, including Parsons Government Services Inc., Xator LLC and Altamira Technologies Corp Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency) OSD (Office of the Secretary of Defense)	$927,540,604	1.1%	Rank history: #22 in FY2021, #22 in FY2022, #19 in FY2023 and #19 in FY2024; up 2 since FY2024.
18	Serco Inc 3 awardees Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services) Army (Department of the Army)	$862,394,783	1.0%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #18 in FY2024; unchanged since FY2024.
19	Accenture Federal Services LLC 5 awardees, including Cognosante MVH LLC and Cognosante, LLC Top agencies Treasury (Department of the Treasury) VA (Department of Veterans Affairs) ED (Department of Education)	$849,877,510	1.0%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2024; down 2 since FY2024.
20	The Mitre Corporation 2 awardees Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) Treasury (Department of the Treasury)	$825,952,749	1.0%	Rank history: #15 in FY2021, #14 in FY2022, #12 in FY2023 and #14 in FY2024; down 6 since FY2024.
21	BAE Systems 15 awardees, including BAE Systems Technology Solutions & Services Inc., BAE Systems Information and Electronic Systems Integration Inc. and BAE Systems Land & Armaments L.P. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$642,843,018	0.7%	Rank history: #25 in FY2021, #20 in FY2022, #15 in FY2023 and #23 in FY2024; up 2 since FY2024.
22	Smartronix, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$642,192,534	0.7%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2024; up 11 since FY2024.
23	L3Harris Technologies, Inc. 30 awardees, including L3Harris Technologies Integrated Systems L.P., L3 Technologies, Inc. and L3Harris Forcex, Inc. Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) DOT (Department of Transportation)	$604,480,648	0.7%	Rank history: #17 in FY2021, #16 in FY2022, #17 in FY2023 and #24 in FY2024; up 1 since FY2024.
24	Beyond New Horizons, LLC Top agencies USAF (Department of the Air Force)	$496,146,005	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
25	Peraton Inc. 3 awardees, including Peraton Enterprise Solutions LLC and Safeguard Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$482,152,834	0.6%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2024; up 6 since FY2024.
26	Arctic Slope Regional Corporation 23 awardees, including Agile Decision Sciences, LLC, Netcentric Technology, LLC and Asrc Federal System Solutions LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOJ (Department of Justice)	$481,715,394	0.6%	Rank history: #48 in FY2021, #53 in FY2022, #64 in FY2023 and #48 in FY2024; up 22 since FY2024.
27	V2X, Inc. 6 awardees, including V2X Aerospace LLC, V2X Systems LLC and Vertex Modernization and Sustainment LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$480,024,146	0.6%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2024; up 35 since FY2024.
28	KBR Wyle Services LLC 8 awardees, including KBR Services, LLC and Kord Technologies, LLC Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) Army (Department of the Army)	$447,256,675	0.5%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2024; up 4 since FY2024.
29	General Atomics Aeronautical Systems, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) Navy (Department of the Navy)	$442,014,505	0.5%	Rank history: not on the FY2021–FY2024 lists; up 72 since FY2024.
30	CGI Federal Inc. 3 awardees, including Sehlke Consulting LLC and Manufacturing Technical Solutions, LLC Top agencies DOS (Department of State) DHS (Department of Homeland Security) NASA (National Aeronautics and Space Administration)	$419,038,065	0.5%	Rank history: not on the FY2021–FY2023 lists and #43 in FY2024; up 13 since FY2024.
31	Leonardo S.p.A. 7 awardees, including DRS Sustainment Systems, Inc., Laurel Technologies Partnership and DRS Network & Imaging Systems LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USSOCOM (United States Special Operations Command)	$407,278,652	0.5%	Rank history: #85 in FY2021, #88 in FY2022, #41 in FY2023 and #57 in FY2024; up 26 since FY2024.
32	Guidehouse Inc. 5 awardees, including Peraton Technology Services Inc., Guidehouse Digital LLC and Aptim Federal Services, LLC Top agencies HHS (Department of Health and Human Services) DOS (Department of State) USAF (Department of the Air Force)	$380,160,994	0.4%	Rank history: not on the FY2021–FY2024 lists; up 89 since FY2024.
33	ManTech International Corporation 2 awardees, including Mantech Advanced Systems International, Inc. and Unison Software Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$348,329,855	0.4%	Rank history: #18 in FY2021, #18 in FY2022, #42 in FY2023 and #47 in FY2024; up 14 since FY2024.
34	Tetra Tech, Inc. 22 awardees, including LS Technologies LLC, Ard, Inc. and Management Systems International, Inc. Top agencies USAID (US Agency for International Development) DOT (Department of Transportation) DOS (Department of State)	$346,965,428	0.4%	Rank history: #28 in FY2021, #26 in FY2022, #27 in FY2023 and #25 in FY2024; down 9 since FY2024.
35	Odyssey Systems Consulting Group, Ltd. Top agencies USAF (Department of the Air Force)	$341,366,949	0.4%	Rank history: not on the FY2021–FY2024 lists; up 394 since FY2024.
36	Salient Crgt, Inc. Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) CFTC (Commodity Futures Trading Commission)	$327,202,872	0.4%	Rank history: not on the FY2021–FY2024 lists; up 161 since FY2024.
37	Torch Technologies Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$307,764,811	0.4%	Rank history: #31 in FY2021, #51 in FY2022, #43 in FY2023 and #46 in FY2024; up 9 since FY2024.
38	UnitedHealth Group Incorporated 5 awardees, including Optumrx Administrative Services, LLC, Optumhealth Care Solutions, LLC and Optumserve Technology Services, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$299,952,629	0.3%	Rank history: #90 in FY2021, #75 in FY2022, not on the FY2023 list and #44 in FY2024; up 6 since FY2024.
39	Microsoft Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army) DISA (Defense Information Systems Agency)	$285,757,275	0.3%	Rank history: #45 in FY2021, #49 in FY2022, #50 in FY2023 and #36 in FY2024; down 3 since FY2024.
40	The GEO Group, Inc. 2 awardees, including B.i. Incorporated Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$277,289,603	0.3%	Rank history: #42 in FY2021, #31 in FY2022, #29 in FY2023 and #34 in FY2024; down 6 since FY2024.
41	Olin Corporation Through Olin Winchester LLC Top agencies Army (Department of the Army)	$273,456,828	0.3%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; down 26 since FY2024.
42	Systems Planning and Analysis, Inc. Top agencies Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency) OSD (Office of the Secretary of Defense)	$272,162,414	0.3%	Rank history: #93 in FY2021, #78 in FY2022, #60 in FY2023 and #53 in FY2024; up 11 since FY2024.
43	Clark Construction Group LLC Top agencies Army (Department of the Army)	$262,369,041	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
44	Acacia Center for Justice Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$261,192,647	0.3%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2024; down 9 since FY2024.
45	LMI Consulting, LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army) HHS (Department of Health and Human Services)	$256,171,931	0.3%	Rank history: not on the FY2021 list, #68 in FY2022, #74 in FY2023 and #38 in FY2024; down 7 since FY2024.
46	BAE Systems Land & Armaments L.P. Top agencies Army (Department of the Army)	$253,659,606	0.3%	Rank history: not on the FY2021–FY2023 lists and #59 in FY2024; up 13 since FY2024.
47	BCG Federal Corp. Top agencies DHA (Defense Health Agency) Navy (Department of the Navy) USAF (Department of the Air Force)	$242,086,463	0.3%	Rank history: not on the FY2021–FY2023 lists and #76 in FY2024; up 29 since FY2024.
48	DAI Global LLC Top agencies USAID (US Agency for International Development)	$226,097,124	0.3%	Rank history: #43 in FY2021, #37 in FY2022, #30 in FY2023 and #28 in FY2024; down 20 since FY2024.
49	Ernst & Young LLP 3 awardees, including Dignari, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DOJ (Department of Justice)	$224,826,671	0.3%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2024; up 16 since FY2024.
50	Family Health International Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services)	$222,116,896	0.3%	Rank history: not on the FY2021–FY2024 lists; up 188 since FY2024.
51	Scientific Research Corporation Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense) USAF (Department of the Air Force)	$220,150,834	0.3%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2024; up 13 since FY2024.
52	International Business Machines Corporation 4 awardees Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) DMEA (Defense Microelectronics Activity)	$219,476,750	0.3%	Rank history: #47 in FY2021, #44 in FY2022, #49 in FY2023 and #50 in FY2024; down 2 since FY2024.
53	Oasis Systems, LLC Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$215,793,190	0.3%	Rank history: #86 in FY2021, #48 in FY2022, #62 in FY2023 and #60 in FY2024; up 7 since FY2024.
54	Fluor Corporation Through Fluor Federal Services Inc. Top agencies DHS (Department of Homeland Security)	$206,604,488	0.2%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023 and #77 in FY2024; up 23 since FY2024.
55	Credence Management Solutions Limited Liability Company Top agencies USAID (US Agency for International Development) USAF (Department of the Air Force) Army (Department of the Army)	$203,603,059	0.2%	Rank history: #68 in FY2021, #57 in FY2022, #52 in FY2023 and #49 in FY2024; down 6 since FY2024.
56	ABT Global LLC Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$191,527,864	0.2%	Rank history: #32 in FY2021, #40 in FY2022, #48 in FY2023 and #45 in FY2024; down 11 since FY2024.
57	Sev1Tech, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$185,129,267	0.2%	Rank history: #76 in FY2021, #82 in FY2022, #73 in FY2023 and #80 in FY2024; up 23 since FY2024.
58	SRC Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$184,012,728	0.2%	Rank history: not on the FY2021 list, #96 in FY2022, #65 in FY2023 and #41 in FY2024; down 17 since FY2024.
59	Intuitive Research and Technology Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$182,277,477	0.2%	Rank history: not on the FY2021–FY2024 lists; up 142 since FY2024.
60	Research Triangle Institute Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$179,716,828	0.2%	Rank history: #39 in FY2021, #46 in FY2022, #39 in FY2023 and #30 in FY2024; down 30 since FY2024.
61	Johns Hopkins University 4 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC, The Johns Hopkins Health System Corporation and Johns Hopkins Bayview Medical Center, Inc. Top agencies USAF (Department of the Air Force) USCYBERCOM (Department of Defense Cyber Command) USSOCOM (United States Special Operations Command)	$175,026,074	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
62	Linquest Corporation Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$171,255,495	0.2%	Rank history: #69 in FY2021, #86 in FY2022, #70 in FY2023 and #70 in FY2024; up 8 since FY2024.
63	Noblis, Inc. Top agencies DOT (Department of Transportation) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$163,861,082	0.2%	Rank history: #62 in FY2021, #50 in FY2022, #46 in FY2023 and #58 in FY2024; down 5 since FY2024.
64	Path Top agencies USAID (US Agency for International Development)	$157,716,684	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
65	Carahsoft Technology Corp Top agencies HHS (Department of Health and Human Services) DOE (Department of Energy) Navy (Department of the Navy)	$152,268,555	0.2%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and #52 in FY2024; down 13 since FY2024.
66	Alutiiq Essential Services LLC Top agencies DOS (Department of State)	$146,238,290	0.2%	Rank history: not on the FY2021–FY2024 lists; up 238 since FY2024.
67	Trace Systems, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$146,158,457	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
68	Strategic Analysis, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) HHS (Department of Health and Human Services) OSD (Office of the Secretary of Defense)	$143,953,613	0.2%	Rank history: not on the FY2021–FY2024 lists; up 35 since FY2024.
69	Soldierpoint Digital Health, LLC Top agencies VA (Department of Veterans Affairs)	$142,980,739	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
70	Inter-CON Security Systems Inc. Top agencies DOS (Department of State) GAO (Government Accountability Office) DOJ (Department of Justice)	$141,992,202	0.2%	Rank history: not on the FY2021–FY2023 lists and #97 in FY2024; up 27 since FY2024.
71	BC Partners LLP Through Gardaworld Federal Services LLC Top agencies DOS (Department of State)	$139,828,905	0.2%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2024; up 15 since FY2024.
72	Oshkosh Corporation Through Oshkosh Defense LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$137,248,406	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
73	Sigmatech Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$137,018,308	0.2%	Rank history: not on the FY2021–FY2023 lists and #79 in FY2024; up 6 since FY2024.
74	Sallyport Global Holdings Inc. Top agencies USAF (Department of the Air Force)	$134,741,521	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
75	CQ JV, LLC Top agencies USAF (Department of the Air Force)	$133,986,384	0.2%	Rank history: not on the FY2021–FY2024 lists; up 32 since FY2024.
76	Applied Research Associates, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) OSD (Office of the Secretary of Defense)	$131,061,543	0.2%	Rank history: not on the FY2021 list, #73 in FY2022, #56 in FY2023 and #72 in FY2024; down 4 since FY2024.
77	Valiant Global Defense Services Inc. Top agencies Army (Department of the Army) DTRA (Defense Threat Reduction Agency) USAF (Department of the Air Force)	$130,909,339	0.2%	Rank history: not on the FY2021–FY2024 lists; up 157 since FY2024.
78	Cherokee Nation Strategic Programs, L.L.C. Top agencies USAF (Department of the Air Force) DOS (Department of State) DHS (Department of Homeland Security)	$130,344,852	0.2%	Rank history: not on the FY2021–FY2024 lists; up 32 since FY2024.
79	Semanticbits LLC 3 awardees, including ICF Incorporated, L.L.C. and Incentive Technology Group LLC Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation) USAID (US Agency for International Development)	$128,279,012	0.1%	Rank history: not on the FY2021–FY2023 lists and #61 in FY2024; down 18 since FY2024.
80	P E Systems, Inc. Top agencies USAF (Department of the Air Force)	$127,398,810	0.1%	Rank history: not on the FY2021–FY2024 lists; up 89 since FY2024.
81	Modern Technology Solutions, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) Navy (Department of the Navy)	$126,586,643	0.1%	Rank history: not on the FY2021–FY2024 lists; up 57 since FY2024.
82	Mag DS Corp Top agencies Army (Department of the Army)	$125,393,396	0.1%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2024; unchanged since FY2024.
83	Dewberry Engineers Inc. Top agencies DHS (Department of Homeland Security) DOT (Department of Transportation)	$125,272,862	0.1%	Rank history: not on the FY2021–FY2024 lists; up 182 since FY2024.
84	Metrostar Systems, LLC Top agencies WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force) Army (Department of the Army)	$122,586,170	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
85	Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force)	$121,251,013	0.1%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2024; up 13 since FY2024.
86	Halvik LLC Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) USSOCOM (United States Special Operations Command)	$119,258,760	0.1%	Rank history: not on the FY2021–FY2024 lists; up 122 since FY2024.
87	Precise Systems, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$118,489,330	0.1%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and #75 in FY2024; down 12 since FY2024.
88	360 Patriot Enterprises LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$113,850,418	0.1%	Rank history: not on the FY2021–FY2024 lists; up 37 since FY2024.
89	Sierra Nevada Company, LLC 4 awardees Top agencies USSOCOM (United States Special Operations Command) USAF (Department of the Air Force) Army (Department of the Army)	$111,539,164	0.1%	Rank history: not on the FY2021–FY2024 lists; up 70 since FY2024.
90	Axle Informatics, LLC Top agencies HHS (Department of Health and Human Services)	$110,664,526	0.1%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2023 and not on the FY2024 list; up 30 since FY2024.
91	Ameresco Inc. 3 awardees, including Ameresco Select, Inc. and CMI Management, LLC Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$109,221,771	0.1%	Rank history: not on the FY2021–FY2024 lists; up 211 since FY2024.
92	DCS Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$108,634,513	0.1%	Rank history: #53 in FY2021, #54 in FY2022, #54 in FY2023 and #83 in FY2024; down 9 since FY2024.
93	QED Systems LLC Top agencies Army (Department of the Army)	$108,023,929	0.1%	Rank history: not on the FY2021–FY2024 lists; up 112 since FY2024.
94	Anduril Industries Inc. 3 awardees, including Area-I, LLC Top agencies USSOCOM (United States Special Operations Command) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$106,580,532	0.1%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2024; down 25 since FY2024.
95	Bowhead Program Management & Operations, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$106,174,641	0.1%	Rank history: not on the FY2021–FY2024 lists; up 19 since FY2024.
96	Kelly Services, Inc. Top agencies HHS (Department of Health and Human Services)	$104,900,222	0.1%	Rank history: not on the FY2021–FY2024 lists; up 12 since FY2024.
97	Credence Dynamo Solutions LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$104,341,531	0.1%	Rank history: not on the FY2021–FY2024 lists; up 47 since FY2024.
98	Securitas Electronic Security Inc. Through Paragon Systems Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) DHS (Department of Homeland Security)	$104,261,084	0.1%	Rank history: not on the FY2021–FY2024 lists; up 215 since FY2024.
99	Asgn Incorporated Through ECS Federal, LLC Top agencies HHS (Department of Health and Human Services) DARPA (Defense Advanced Research Projects Agency) Commerce (Department of Commerce)	$103,787,532	0.1%	Rank history: not on the FY2021–FY2024 lists; up 52 since FY2024.
100	Tecolote Research, Inc. Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense) DHS (Department of Homeland Security)	$101,800,885	0.1%	Rank history: not on the FY2021–FY2024 lists; up 46 since FY2024.

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100 of 10,945 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	$34,591,955,069	Lockheed Martin Corporation
R499 Other Professional Services	$26,225,728,099	The Boeing Company
R408 Program Management/Support Services	$8,932,375,056	Deloitte
R423 Intelligence Services	$1,138,494,874	Smartronix, LLC
R430 Support – Professional: Physical Security and Badging	$852,022,986	Inter-CON Security Systems Inc.
R410 Support – Professional: Program Evaluation/Review/Development	$834,751,999	RTX Corporation
R429 Support – Professional: Emergency Response/Disaster Planning/Preparedness Support	$652,928,225	Fluor Corporation
R418 Legal Services	$650,952,417	Acacia Center for Justice
R426 Communications Services	$575,224,790	General Dynamics Corporation
R405 Operations Research and Quantitative Analysis Services	$375,526,517	Leidos Holdings, Inc.
R431 Support – Professional: Human Resources	$365,680,977	Deloitte
R412 Simulation	$233,882,342	CAE Inc.
R422 Market Research and Public Opinion Services (includes telephone and field interviews, focus testing, and surveys)	$226,916,396	Westat, Inc.
R497 Personal Services Contracts	$216,663,974	Research Triangle Institute
R424 Expert Witness	$195,015,061	Georgia TECH Applied Research Corp
R416 Veterinary/Animal Care Services	$152,499,664	Priority One Services, Inc.
R406 Policy Review/Development Services	$147,314,952	Ocean Bay Information and Systems Management, LLC
R427 Weather Reporting/Observation Services	$138,904,918	Vero Technical Support Inc
R401 Personal Care Services (includes such services as barber and beauty shop, shoe repairs, tailoring, etc.)	$78,186,987	Coastal Clinical & Management Services Inc
R420 Support – Professional: Certifications and Accreditations (Other Than Education or Information Technology C&A)	$54,287,812	Joint Commission On Accreditation of Healthcare Organizations
R498 Patent and Trademark Services	$53,583,850	CPA Global (Landon IP) Inc.
R402 Real Estate Brokerage Services	$34,562,278	Vendor Resource Management, Inc.
R411 Real Property Appraisals Services (SIC 6531)	$32,873,578	Colliers International Greater LOS Angeles Inc
R428 Industrial Hygienics	$12,877,277	Dgi-Ati II LLC
R404 Land Surveys, Cadastral Services (non-construction)	$12,792,342	Geographic Information 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 $85.8 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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 FY2025?

1. Booz Allen Hamilton Holding Corporation ($3.3B), 2. The Boeing Company ($2.48B), 3. CACI International Inc. ($1.9B), 4. General Dynamics Corporation ($1.77B), 5. Lockheed Martin Corporation ($1.5B), 6. Deloitte ($1.48B), 7. Science Applications International Corporation ($1.47B), 8. Amentum Holdings, Inc. ($1.45B), 9. Northrop Grumman Corporation ($1.44B), 10. Leidos Holdings, Inc. ($1.3B).

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