Top 100 Contractors in NAICS 54199: All Other Professional, Scientific, and Technical Services, Jul 2025–Jun 2026

Name: Top 100 Contractors in NAICS 54199: All Other Professional, Scientific, and Technical Services, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 50% of NAICS 54199 contract dollars from July 2025 through June 2026

Contract obligations: $12,617,097,223 Net of deobligations, by contracts coded NAICS 54199 or a code under it
Contractors: 2,061 Parent companies with an obligation
Largest contractor: Battelle Memorial Institute $2.47 billion, 18.7% of obligations
Data as of: Oct 14, 2026

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

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Battelle Memorial Institute 2 awardees, including Battelle Energy Alliance, LLC Top agencies DOE (Department of Energy) DTRA (Defense Threat Reduction Agency) DARPA (Defense Advanced Research Projects Agency)	$2,472,937,298	18.7%	Rank history: #1 in FY2021, #1 in FY2022, not on the FY2023 list, #1 in FY2024 and #1 in FY2025; unchanged since Jul 2024–Jun 2025.
2	Sierra Nevada Company, LLC 3 awardees Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$761,103,815	5.8%	Rank history: #2 in FY2021, #3 in FY2022, #3 in FY2023, #4 in FY2024 and #4 in FY2025; unchanged since Jul 2024–Jun 2025.
3	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies Army (Department of the Army) OSD (Office of the Secretary of Defense) HHS (Department of Health and Human Services)	$725,665,155	5.5%	Rank history: #11 in FY2021, #9 in FY2022, #7 in FY2023, #8 in FY2024 and #3 in FY2025; up 2 since Jul 2024–Jun 2025.
4	The Mitre Corporation 3 awardees Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) VA (Department of Veterans Affairs)	$610,708,960	4.6%	Rank history: #3 in FY2021, #2 in FY2022, #2 in FY2023, #3 in FY2024 and #2 in FY2025; up 7 since Jul 2024–Jun 2025.
5	Huntington Ingalls Industries, Inc. 2 awardees, including HII Mission Technologies Corp Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$574,873,911	4.4%	Rank history: not on the FY2021–FY2022 lists, #17 in FY2023, #10 in FY2024 and #6 in FY2025; down 1 since Jul 2024–Jun 2025.
6	Smartronix, LLC Top agencies Navy (Department of the Navy)	$407,883,755	3.1%	Rank history: not on the FY2021–FY2024 lists and #5 in FY2025; up 1 since Jul 2024–Jun 2025.
7	Institute for Defense Analyses Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army) Navy (Department of the Navy)	$293,182,524	2.2%	Rank history: #12 in FY2021, #8 in FY2022, #8 in FY2023, #9 in FY2024 and #8 in FY2025; up 2 since Jul 2024–Jun 2025.
8	Parsons Corporation 4 awardees, including Ptsi Managed Services Inc., Parsons Government Services International Inc. and Altamira Technologies Corp Top agencies DOT (Department of Transportation) DOE (Department of Energy) DTRA (Defense Threat Reduction Agency)	$268,165,791	2.0%	Rank history: #91 in FY2021, #68 in FY2022, #19 in FY2023, #19 in FY2024 and #11 in FY2025; up 79 since Jul 2024–Jun 2025.
9	Northrop Grumman Corporation 5 awardees, including Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$261,350,681	2.0%	Rank history: #17 in FY2021, #10 in FY2022, #13 in FY2023, #13 in FY2024 and #7 in FY2025; up 1 since Jul 2024–Jun 2025.
10	CACI International Inc. 3 awardees, including Caci, Inc. - Federal and Caci Idt, LLC Top agencies Army (Department of the Army) USSOCOM (United States Special Operations Command) DHS (Department of Homeland Security)	$215,314,523	1.6%	Rank history: #26 in FY2021, #35 in FY2022, #50 in FY2023, #32 in FY2024 and #17 in FY2025; up 11 since Jul 2024–Jun 2025.
11	RTX Corporation 13 awardees, including Raytheon Southeast Asia Systems Company and Raytheon Company Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$184,137,216	1.4%	Rank history: #13 in FY2021, #13 in FY2022, #18 in FY2023, #5 in FY2024 and #19 in FY2025; up 16 since Jul 2024–Jun 2025.
12	Oak Ridge Associated Universities, Incorporated Top agencies DOE (Department of Energy) HHS (Department of Health and Human Services)	$168,103,839	1.3%	Rank history: #5 in FY2021, #4 in FY2022, #5 in FY2023, #6 in FY2024 and #9 in FY2025; down 6 since Jul 2024–Jun 2025.
13	Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies OSD (Office of the Secretary of Defense) USSOCOM (United States Special Operations Command) USAF (Department of the Air Force)	$144,257,234	1.1%	Rank history: not on the FY2021–FY2024 lists and #12 in FY2025; new, not ranked in Jul 2024–Jun 2025.
14	General Dynamics Corporation 5 awardees, including General Dynamics Information Technology, Inc., General Dynamics Land Systems Customer Service & Support Company and General Dynamics Mission Systems, Inc. Top agencies Army (Department of the Army) DTRA (Defense Threat Reduction Agency) DHA (Defense Health Agency)	$140,520,288	1.1%	Rank history: #60 in FY2021, #52 in FY2022, #54 in FY2023, #26 in FY2024 and #16 in FY2025; up 9 since Jul 2024–Jun 2025.
15	Lockheed Martin Corporation 5 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$139,805,139	1.1%	Rank history: #64 in FY2021, not on the FY2022 list, #25 in FY2023, #30 in FY2024 and #26 in FY2025; up 20 since Jul 2024–Jun 2025.
16	Path Top agencies USAID (US Agency for International Development)	$135,062,532	1.0%	Rank history: not on the FY2021–FY2023 lists, #70 in FY2024 and #14 in FY2025; up 34 since Jul 2024–Jun 2025.
17	Bluestaq LLC Top agencies USAF (Department of the Air Force)	$129,441,191	1.0%	Rank history: not on the FY2021 list, #44 in FY2022, #42 in FY2023, #17 in FY2024 and #18 in FY2025; down 1 since Jul 2024–Jun 2025.
18	Deloitte 2 awardees, including Deloitte Consulting LLP and Deloitte & Touche LLP Top agencies USAF (Department of the Air Force) DOS (Department of State) HHS (Department of Health and Human Services)	$105,605,449	0.8%	Rank history: not on the FY2021–FY2023 lists, #18 in FY2024 and #15 in FY2025; down 3 since Jul 2024–Jun 2025.
19	Systems Planning and Analysis, Inc. Top agencies OSD (Office of the Secretary of Defense) DARPA (Defense Advanced Research Projects Agency) USAF (Department of the Air Force)	$103,510,413	0.8%	Rank history: #57 in FY2021, #65 in FY2022, #48 in FY2023, #66 in FY2024 and #38 in FY2025; up 32 since Jul 2024–Jun 2025.
20	The CNA Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) OSD (Office of the Secretary of Defense)	$98,325,525	0.7%	Rank history: #19 in FY2021, #20 in FY2022, #21 in FY2023, #24 in FY2024 and #22 in FY2025; up 6 since Jul 2024–Jun 2025.
21	Accenture Federal Services LLC 2 awardees Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) OSD (Office of the Secretary of Defense)	$94,165,070	0.7%	Rank history: not on the FY2021–FY2023 lists, #25 in FY2024 and #31 in FY2025; up 16 since Jul 2024–Jun 2025.
22	Qlarant Integrity Solutions LLC Top agencies HHS (Department of Health and Human Services)	$93,277,894	0.7%	Rank history: not on the FY2021–FY2023 lists, #58 in FY2024 and #23 in FY2025; up 2 since Jul 2024–Jun 2025.
23	ABT Global LLC Top agencies USAID (US Agency for International Development)	$88,484,977	0.7%	Rank history: #6 in FY2021, #6 in FY2022, #12 in FY2023, #11 in FY2024 and #10 in FY2025; down 6 since Jul 2024–Jun 2025.
24	Asgn Incorporated Through ECS Federal, LLC Top agencies DARPA (Defense Advanced Research Projects Agency) HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$84,360,734	0.6%	Rank history: not on the FY2021–FY2023 lists, #46 in FY2024 and #25 in FY2025; up 8 since Jul 2024–Jun 2025.
25	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) NSF (National Science Foundation)	$79,479,893	0.6%	Rank history: #16 in FY2021, #15 in FY2022, #14 in FY2023, #15 in FY2024 and #21 in FY2025; down 12 since Jul 2024–Jun 2025.
26	Peraton Inc. 2 awardees, including Safeguard Services LLC Top agencies HHS (Department of Health and Human Services)	$74,223,218	0.6%	Rank history: not on the FY2021–FY2024 lists and #32 in FY2025; up 276 since Jul 2024–Jun 2025.
27	Valiant Global Defense Services Inc. 2 awardees Top agencies Army (Department of the Army) DTRA (Defense Threat Reduction Agency)	$73,751,585	0.6%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; up 1 since Jul 2024–Jun 2025.
28	Schafer Government Services, LLC Top agencies DARPA (Defense Advanced Research Projects Agency)	$70,078,103	0.5%	Rank history: not on the FY2021–FY2024 lists and #35 in FY2025; up 18 since Jul 2024–Jun 2025.
29	The Rand Corporation Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army) MDA (DOD Missile Defense Agency)	$69,408,419	0.5%	Rank history: #18 in FY2021, #16 in FY2022, #16 in FY2023, #21 in FY2024 and #24 in FY2025; down 10 since Jul 2024–Jun 2025.
30	Strategic Analysis, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) WHS (DOD Washington Headquarters Service)	$67,177,046	0.5%	Rank history: #74 in FY2021, #57 in FY2022, #47 in FY2023, #33 in FY2024 and #20 in FY2025; down 5 since Jul 2024–Jun 2025.
31	UnitedHealth Group Incorporated 2 awardees, including Optumhealth Care Solutions, LLC and Change Healthcare Operations, LLC Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$62,580,091	0.5%	Rank history: #21 in FY2021, #21 in FY2022, not on the FY2023 list, #34 in FY2024 and #40 in FY2025; up 5 since Jul 2024–Jun 2025.
32	Amentum Holdings, Inc. 5 awardees, including Amentum Services, Inc., URS Federal Services International, Inc. and PAE Korea Limited Top agencies DTRA (Defense Threat Reduction Agency) Army (Department of the Army) DARPA (Defense Advanced Research Projects Agency)	$59,170,444	0.4%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; up 43 since Jul 2024–Jun 2025.
33	BAE Systems 2 awardees, including BAE Systems Technology Solutions & Services Inc. and BAE Systems Information & Electronic Systems Integration Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$56,680,379	0.4%	Rank history: not on the FY2021–FY2024 lists and #30 in FY2025; up 8 since Jul 2024–Jun 2025.
34	Cyber Engineering and Technical Alliance, LLC Top agencies USAF (Department of the Air Force) USAID (US Agency for International Development) DHS (Department of Homeland Security)	$55,771,968	0.4%	Rank history: not on the FY2021 list, #87 in FY2022, #51 in FY2023, #40 in FY2024 and #33 in FY2025; up 14 since Jul 2024–Jun 2025.
35	Scientific Research Corporation Top agencies OSD (Office of the Secretary of Defense) USAF (Department of the Air Force)	$55,217,087	0.4%	Rank history: not on the FY2021–FY2024 lists and #49 in FY2025; up 25 since Jul 2024–Jun 2025.
36	Hendall Inc. Top agencies HHS (Department of Health and Human Services)	$51,441,838	0.4%	Rank history: #51 in FY2021, #49 in FY2022, #44 in FY2023, #48 in FY2024 and #73 in FY2025; up 11 since Jul 2024–Jun 2025.
37	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) OSD (Office of the Secretary of Defense)	$50,659,914	0.4%	Rank history: #24 in FY2021, #26 in FY2022, #22 in FY2023, #29 in FY2024 and #37 in FY2025; down 3 since Jul 2024–Jun 2025.
38	Connected Alliances LLC Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$47,721,554	0.4%	Rank history: not on the FY2021 list, #62 in FY2022, #77 in FY2023, #22 in FY2024 and #41 in FY2025; down 16 since Jul 2024–Jun 2025.
39	Arctic Slope Regional Corporation 8 awardees, including Asrc Federal Technology Solutions, LLC, Agile Decision Sciences, LLC and Asrc Federal Business Innovation LLC Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) Treasury (Department of the Treasury)	$47,007,342	0.4%	Rank history: #83 in FY2021, not on the FY2022–FY2024 lists and #36 in FY2025; up 254 since Jul 2024–Jun 2025.
40	Celeen LLC Top agencies DOD (Department of Defense) OSD (Office of the Secretary of Defense) USAF (Department of the Air Force)	$44,398,815	0.3%	Rank history: not on the FY2021–FY2023 lists, #43 in FY2024 and #45 in FY2025; up 50 since Jul 2024–Jun 2025.
41	Vets Synergetic Group LLC Top agencies HHS (Department of Health and Human Services)	$40,534,412	0.3%	Rank history: not on the FY2021–FY2024 lists and #44 in FY2025; up 67 since Jul 2024–Jun 2025.
42	Coventbridge (USA) LLC Top agencies HHS (Department of Health and Human Services)	$38,206,767	0.3%	Rank history: not on the FY2021–FY2023 lists, #56 in FY2024 and #46 in FY2025; up 13 since Jul 2024–Jun 2025.
43	Riverside Research Institute Top agencies USAF (Department of the Air Force)	$37,849,452	0.3%	Rank history: not on the FY2021–FY2023 lists, #62 in FY2024 and #52 in FY2025; up 14 since Jul 2024–Jun 2025.
44	Noridian Healthcare Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$36,915,124	0.3%	Rank history: not on the FY2021–FY2023 lists, #64 in FY2024 and #43 in FY2025; up 73 since Jul 2024–Jun 2025.
45	V2X, Inc. 2 awardees, including V2X Aerospace LLC and Vertex Modernization and Sustainment LLC Top agencies Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency) USAF (Department of the Air Force)	$35,970,241	0.3%	Rank history: not on the FY2021–FY2024 lists and #27 in FY2025; down 7 since Jul 2024–Jun 2025.
46	Analytic Services Inc. Top agencies OSD (Office of the Secretary of Defense)	$35,771,579	0.3%	Rank history: not on the FY2021–FY2023 lists, #76 in FY2024 and #51 in FY2025; down 1 since Jul 2024–Jun 2025.
47	PAL Technologies Inc Top agencies USAF (Department of the Air Force)	$35,569,400	0.3%	Rank history: not on the FY2021–FY2024 lists and #47 in FY2025; new, not ranked in Jul 2024–Jun 2025.
48	Sev1Tech, LLC Top agencies Army (Department of the Army)	$35,335,515	0.3%	Rank history: not on the FY2021–FY2024 lists and #99 in FY2025; new, not ranked in Jul 2024–Jun 2025.
49	Mission for Essential Drugs and Supplies Top agencies USAID (US Agency for International Development)	$32,766,931	0.2%	Rank history: not on the FY2021–FY2025 lists; up 82 since Jul 2024–Jun 2025.
50	Cherokee Nation 8 awardees, including Cherokee Nation Government Solutions, L.L.C., Cherokee Nation Integrated Health, L.L.C. and Cherokee United Services, L.L.C. Top agencies Navy (Department of the Navy) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$32,661,344	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
51	People, Technology and Processes, LLC Top agencies Navy (Department of the Navy) DOD (Department of Defense)	$31,836,749	0.2%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2023, #83 in FY2024 and #56 in FY2025; up 28 since Jul 2024–Jun 2025.
52	The Boeing Company 8 awardees, including Jeppesen Foreflight, Inc. and Boeing Aerospace Operations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOT (Department of Transportation)	$28,289,246	0.2%	Rank history: #46 in FY2021, #91 in FY2022, #53 in FY2023, #55 in FY2024 and #53 in FY2025; up 2 since Jul 2024–Jun 2025.
53	KLD Associates Inc. Top agencies DOT (Department of Transportation)	$26,183,492	0.2%	Rank history: not on the FY2021–FY2023 lists, #60 in FY2024 and #60 in FY2025; new, not ranked in Jul 2024–Jun 2025.
54	Linquest Corporation Top agencies USAF (Department of the Air Force)	$26,027,908	0.2%	Rank history: #81 in FY2021, #82 in FY2022, #66 in FY2023, #75 in FY2024 and #63 in FY2025; down 2 since Jul 2024–Jun 2025.
55	G D Arab Limited Company Top agencies Army (Department of the Army)	$25,816,680	0.2%	Rank history: not on the FY2021 list, #83 in FY2022, #95 in FY2023, #86 in FY2024 and #90 in FY2025; up 63 since Jul 2024–Jun 2025.
56	Serco Inc Top agencies Navy (Department of the Navy) Commerce (Department of Commerce)	$24,579,066	0.2%	Rank history: not on the FY2021–FY2024 lists and #70 in FY2025; up 26 since Jul 2024–Jun 2025.
57	World Wide LAN Tec, Inc. Top agencies USAF (Department of the Air Force)	$24,368,671	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
58	Axle Informatics, LLC Top agencies HHS (Department of Health and Human Services)	$23,873,697	0.2%	Rank history: #69 in FY2021, #85 in FY2022, #68 in FY2023, #27 in FY2024 and #61 in FY2025; down 9 since Jul 2024–Jun 2025.
59	National Marrow Donor Program Top agencies HHS (Department of Health and Human Services)	$23,765,119	0.2%	Rank history: not on the FY2021 list, #77 in FY2022, #82 in FY2023, #81 in FY2024 and #68 in FY2025; up 13 since Jul 2024–Jun 2025.
60	Calvert Systems Engineering, Inc. Top agencies USAF (Department of the Air Force)	$23,647,234	0.2%	Rank history: not on the FY2021–FY2024 lists and #88 in FY2025; up 56 since Jul 2024–Jun 2025.
61	Techtrans International Inc. Top agencies DTRA (Defense Threat Reduction Agency) DOS (Department of State)	$23,471,697	0.2%	Rank history: not on the FY2021–FY2024 lists and #58 in FY2025; up 28 since Jul 2024–Jun 2025.
62	CPA Global (Landon IP) Inc. Top agencies Commerce (Department of Commerce)	$23,379,944	0.2%	Rank history: not on the FY2021–FY2025 lists; up 93 since Jul 2024–Jun 2025.
63	Gap Solutions, Inc. Top agencies HHS (Department of Health and Human Services)	$23,010,487	0.2%	Rank history: not on the FY2021–FY2024 lists and #78 in FY2025; up 30 since Jul 2024–Jun 2025.
64	CSA Global LLC Top agencies Army (Department of the Army)	$22,884,061	0.2%	Rank history: not on the FY2021–FY2025 lists; up 71 since Jul 2024–Jun 2025.
65	Eagle Integrated Services, LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) Navy (Department of the Navy)	$22,735,846	0.2%	Rank history: not on the FY2021 list, #72 in FY2022, #75 in FY2023, #73 in FY2024 and #66 in FY2025; up 4 since Jul 2024–Jun 2025.
66	SRC Inc. Top agencies USAF (Department of the Air Force)	$22,596,403	0.2%	Rank history: not on the FY2021–FY2023 lists, #96 in FY2024 and #81 in FY2025; up 48 since Jul 2024–Jun 2025.
67	Leadsonline, LLC Top agencies DOJ (Department of Justice)	$22,150,831	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
68	Applied Research Associates, Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$20,961,359	0.2%	Rank history: #38 in FY2021, #99 in FY2022, not on the FY2023–FY2024 lists and #76 in FY2025; up 26 since Jul 2024–Jun 2025.
69	Nana Regional Corporation, Inc. 4 awardees, including Akima Data Management LLC, Akima Global Logistics, LLC and Akima Systems Engineering LLC Top agencies DOT (Department of Transportation) DSCA (Defense Security Cooperation Agency) OSD (Office of the Secretary of Defense)	$20,943,707	0.2%	Rank history: not on the FY2021–FY2024 lists and #77 in FY2025; new, not ranked in Jul 2024–Jun 2025.
70	Nightwing Technologies LLC Top agencies USAF (Department of the Air Force)	$20,939,491	0.2%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; up 30 since Jul 2024–Jun 2025.
71	Science Applications International Corporation Top agencies OSD (Office of the Secretary of Defense)	$20,348,186	0.2%	Rank history: not on the FY2021–FY2025 lists; up 70 since Jul 2024–Jun 2025.
72	Cardinal Government Services, Inc. Top agencies Commerce (Department of Commerce)	$19,456,336	0.1%	Rank history: #71 in FY2021, not on the FY2022–FY2024 lists and #93 in FY2025; up 47 since Jul 2024–Jun 2025.
73	Fgs, LLC Top agencies Navy (Department of the Navy)	$19,384,105	0.1%	Rank history: not on the FY2021 list, #95 in FY2022, not on the FY2023 list, #79 in FY2024 and not on the FY2025 list; up 63 since Jul 2024–Jun 2025.
74	Capital Center for Credibility Assessment Corporation Top agencies DHS (Department of Homeland Security)	$19,383,078	0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; up 202 since Jul 2024–Jun 2025.
75	Chitra Productions LLC Top agencies Army (Department of the Army)	$19,216,336	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
76	Nemean Trideum Joint Venture LLC Top agencies Army (Department of the Army)	$19,060,584	0.1%	Rank history: not on the FY2021–FY2024 lists and #94 in FY2025; down 12 since Jul 2024–Jun 2025.
77	Everfox LLC Top agencies USAF (Department of the Air Force)	$18,893,942	0.1%	Rank history: not on the FY2021–FY2024 lists and #84 in FY2025; up 117 since Jul 2024–Jun 2025.
78	Novitas Solutions, Inc. Top agencies HHS (Department of Health and Human Services)	$18,871,998	0.1%	Rank history: not on the FY2021–FY2024 lists and #62 in FY2025; up 51 since Jul 2024–Jun 2025.
79	Vero Technical Support Inc Top agencies DOT (Department of Transportation)	$18,618,697	0.1%	Rank history: not on the FY2021–FY2024 lists and #85 in FY2025; up 64 since Jul 2024–Jun 2025.
80	Seatech Global Security Solutions Top agencies DOE (Department of Energy)	$18,416,024	0.1%	Rank history: not on the FY2021–FY2025 lists; up 113 since Jul 2024–Jun 2025.
81	Guidehouse Inc. 2 awardees, including Peraton Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) DTRA (Defense Threat Reduction Agency) HHS (Department of Health and Human Services)	$17,750,013	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
82	Actionable Solutions Group, LLC Top agencies Army (Department of the Army)	$17,639,830	0.1%	Rank history: #55 in FY2021, #34 in FY2022, #43 in FY2023, #85 in FY2024 and #98 in FY2025; down 26 since Jul 2024–Jun 2025.
83	Computational Physics, Inc. Top agencies Navy (Department of the Navy)	$17,506,898	0.1%	Rank history: not on the FY2021–FY2025 lists; up 30 since Jul 2024–Jun 2025.
84	Modern Technology Solutions, Inc. Top agencies OSD (Office of the Secretary of Defense)	$16,960,950	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
85	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$16,663,268	0.1%	Rank history: #9 in FY2021, #7 in FY2022, #9 in FY2023, #14 in FY2024 and #29 in FY2025; down 73 since Jul 2024–Jun 2025.
86	State of Oregon Department of Fish and Wildlife Top agencies Army (Department of the Army)	$16,582,529	0.1%	Rank history: not on the FY2021–FY2025 lists; up 56 since Jul 2024–Jun 2025.
87	Chenega Government Mission Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$16,571,541	0.1%	Rank history: not on the FY2021–FY2025 lists; up 259 since Jul 2024–Jun 2025.
88	Nemean Solutions LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$16,477,461	0.1%	Rank history: not on the FY2021–FY2025 lists; up 160 since Jul 2024–Jun 2025.
89	Threat TEC - Yorktown JV, LLC Top agencies Army (Department of the Army)	$16,342,902	0.1%	Rank history: #48 in FY2021, #58 in FY2022, #57 in FY2023, #50 in FY2024 and #96 in FY2025; down 19 since Jul 2024–Jun 2025.
90	National Academy of Sciences Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration) DOT (Department of Transportation)	$16,257,654	0.1%	Rank history: #93 in FY2021, not on the FY2022 list, #73 in FY2023, #94 in FY2024 and not on the FY2025 list; up 31 since Jul 2024–Jun 2025.
91	Health Care Service Corporation, A Mutual Legal Reserve Company Top agencies HHS (Department of Health and Human Services)	$16,000,000	0.1%	Rank history: not on the FY2021 list, #97 in FY2022, #74 in FY2023, not on the FY2024 list and #65 in FY2025; up 6 since Jul 2024–Jun 2025.
92	Argentech Solutions, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$15,944,724	0.1%	Rank history: not on the FY2021–FY2025 lists; up 79 since Jul 2024–Jun 2025.
93	Diversified Management Solutions, Inc. Top agencies DOT (Department of Transportation)	$15,895,376	0.1%	Rank history: not on the FY2021–FY2024 lists and #100 in FY2025; up 61 since Jul 2024–Jun 2025.
94	Blue Cross and Blue Shield of South Carolina Through Karna LLC Top agencies HHS (Department of Health and Human Services)	$15,802,595	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023, #80 in FY2024 and #42 in FY2025; down 28 since Jul 2024–Jun 2025.
95	Calibre Systems Inc. Top agencies Army (Department of the Army)	$15,136,180	0.1%	Rank history: #42 in FY2021, #67 in FY2022, #56 in FY2023, #65 in FY2024 and #67 in FY2025; down 34 since Jul 2024–Jun 2025.
96	Elizabeth Glaser Pediatric Aids Foundation Top agencies USAID (US Agency for International Development)	$15,090,274	0.1%	Rank history: not on the FY2021 list, #75 in FY2022, #55 in FY2023, #52 in FY2024 and not on the FY2025 list; down 19 since Jul 2024–Jun 2025.
97	Dexis Interactive Incorporated Top agencies DSCA (Defense Security Cooperation Agency) USAID (US Agency for International Development)	$14,813,383	0.1%	Rank history: not on the FY2021–FY2022 lists, #78 in FY2023, #57 in FY2024 and #54 in FY2025; down 54 since Jul 2024–Jun 2025.
98	Deloitte Consulting Limited Top agencies USAID (US Agency for International Development)	$14,760,356	0.1%	Rank history: not on the FY2021 list, #42 in FY2022, not on the FY2023 list, #51 in FY2024 and not on the FY2025 list; down 20 since Jul 2024–Jun 2025.
99	Zero Point Inc. Top agencies USSOCOM (United States Special Operations Command) DTRA (Defense Threat Reduction Agency)	$14,697,549	0.1%	Rank history: #97 in FY2021 and not on the FY2022–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
100	The Dcode Group Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$14,576,577	0.1%	Rank history: not on the FY2021–FY2025 lists; up 125 since Jul 2024–Jun 2025.

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100 of 2,061 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 54199

Code	Net obligations	Largest contractor
541990 All Other Professional, Scientific, and Technical Services	$12,617,097,223	Battelle Memorial Institute

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 $13.2 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 NAICS 54199 contractors in Jul 2025–Jun 2026?

1. Battelle Memorial Institute ($2.47B), 2. Sierra Nevada Company, LLC ($761M), 3. Booz Allen Hamilton Holding Corporation ($726M), 4. The Mitre Corporation ($611M), 5. Huntington Ingalls Industries, Inc. ($575M), 6. Smartronix, LLC ($408M), 7. Institute for Defense Analyses ($293M), 8. Parsons Corporation ($268M), 9. Northrop Grumman Corporation ($261M), 10. CACI International Inc. ($215M).

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