Top 100 Contractors in NAICS 5419: Other Professional, Scientific, and Technical Services, FY2024

Name: Top 100 Contractors in NAICS 5419: Other Professional, Scientific, and Technical Services, FY2024
Creator: GovTribe

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

The top 10 won 33% of FY2024 NAICS 5419 contract dollars

Contract obligations: $15,204,618,096 Net of deobligations, by contracts coded NAICS 5419 or a code under it
Contractors: 4,271 Parent companies with an obligation
Largest contractor: Battelle Memorial Institute $1.06 billion, 6.6% 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	Battelle Memorial Institute 2 awardees, including Battelle Energy Alliance, LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$1,058,547,238	6.6%	Rank history: #1 in FY2021, #1 in FY2022, not on the FY2023 list and #1 in FY2025; returned.
2	Battelle Energy Alliance, LLC Top agencies DOE (Department of Energy)	$802,657,951	5.0%	Rank history: not on the FY2021 list, #11 in FY2022, #1 in FY2023 and not on the FY2025 list; down 1 since FY2023.
3	The Mitre Corporation 4 awardees Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$752,887,291	4.7%	Rank history: #3 in FY2021, #2 in FY2022, #2 in FY2023 and #2 in FY2025; down 1 since FY2023.
4	Sierra Nevada Company, LLC 4 awardees Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) Army (Department of the Army)	$730,968,625	4.5%	Rank history: #2 in FY2021, #3 in FY2022, #3 in FY2023 and #4 in FY2025; down 1 since FY2023.
5	RTX Corporation 11 awardees, including Raytheon Southeast Asia Systems Company, Raytheon Company and Rockwell Collins, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency)	$409,625,514	2.5%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2025; new.
6	Oak Ridge Associated Universities, Incorporated Top agencies DOE (Department of Energy) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$403,735,397	2.5%	Rank history: #5 in FY2021, #4 in FY2022, #5 in FY2023 and #9 in FY2025; down 1 since FY2023.
7	DAI Global LLC Top agencies USAID (US Agency for International Development)	$332,575,880	2.1%	Rank history: #7 in FY2021, #5 in FY2022, #6 in FY2023 and #13 in FY2025; down 1 since FY2023.
8	Booz Allen Hamilton Holding Corporation 2 awardees, including Booz Allen Hamilton Inc. Top agencies OSD (Office of the Secretary of Defense) HHS (Department of Health and Human Services) DARPA (Defense Advanced Research Projects Agency)	$326,403,820	2.0%	Rank history: #11 in FY2021, #9 in FY2022, #7 in FY2023 and #3 in FY2025; down 1 since FY2023.
9	Institute for Defense Analyses Top agencies OSD (Office of the Secretary of Defense) WHS (DOD Washington Headquarters Service) NSF (National Science Foundation)	$270,639,952	1.7%	Rank history: #12 in FY2021, #8 in FY2022, #8 in FY2023 and #8 in FY2025; down 1 since FY2023.
10	Huntington Ingalls Industries, Inc. 3 awardees, including HII Mission Technologies Corp and Fulcrum It Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$264,592,657	1.6%	Rank history: not on the FY2021–FY2022 lists, #17 in FY2023 and #6 in FY2025; up 7 since FY2023.
11	ABT Global LLC 3 awardees Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services)	$257,025,003	1.6%	Rank history: #6 in FY2021, #6 in FY2022, #12 in FY2023 and #10 in FY2025; up 1 since FY2023.
12	Tetra Tech, Inc. 6 awardees, including Ard, Inc., Tetra TECH ES, Inc. and Management Systems International, Inc. Top agencies USAID (US Agency for International Development) DOT (Department of Transportation) DSCA (Defense Security Cooperation Agency)	$242,693,225	1.5%	Rank history: #14 in FY2021, #19 in FY2022, #11 in FY2023 and #61 in FY2025; down 1 since FY2023.
13	Northrop Grumman Corporation 9 awardees, including Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$214,814,916	1.3%	Rank history: #17 in FY2021, #10 in FY2022, #14 in FY2023 and #7 in FY2025; up 1 since FY2023.
14	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) NSF (National Science Foundation)	$209,387,435	1.3%	Rank history: #16 in FY2021, #15 in FY2022, #13 in FY2023 and #19 in FY2025; down 1 since FY2023.
15	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$206,191,303	1.3%	Rank history: #9 in FY2021, #7 in FY2022, #9 in FY2023 and #30 in FY2025; down 6 since FY2023.
16	The Johns Hopkins University Applied Physics Laboratory LLC Top agencies OSD (Office of the Secretary of Defense) USSOCOM (United States Special Operations Command) DTRA (Defense Threat Reduction Agency)	$201,178,300	1.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
17	Bluestaq LLC Top agencies USAF (Department of the Air Force)	$153,077,727	1.0%	Rank history: not on the FY2021 list, #46 in FY2022, #45 in FY2023 and #18 in FY2025; up 28 since FY2023.
18	Deloitte 3 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies USAF (Department of the Air Force) USAID (US Agency for International Development) DOS (Department of State)	$150,267,164	0.9%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2025; new.
19	Parsons Corporation 2 awardees, including Ptsi Managed Services Inc. and Parsons Government Services International Inc. Top agencies DOT (Department of Transportation) DTRA (Defense Threat Reduction Agency) DOE (Department of Energy)	$124,674,408	0.8%	Rank history: #98 in FY2021, #73 in FY2022, #19 in FY2023 and #11 in FY2025; unchanged since FY2023.
20	Aevex Aerospace, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$123,362,167	0.8%	Rank history: not on the FY2021 list, #14 in FY2022, #4 in FY2023 and not on the FY2025 list; down 16 since FY2023.
21	The Rand Corporation Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army)	$117,260,182	0.7%	Rank history: #18 in FY2021, #16 in FY2022, #16 in FY2023 and #24 in FY2025; down 5 since FY2023.
22	Connected Alliances LLC Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense) DLA (Defense Logistics Agency)	$106,839,426	0.7%	Rank history: not on the FY2021 list, #66 in FY2022, #82 in FY2023 and #43 in FY2025; up 60 since FY2023.
23	Poplicus Incorporated Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$102,923,300	0.6%	Rank history: #72 in FY2021, #67 in FY2022, #39 in FY2023 and #41 in FY2025; up 16 since FY2023.
24	The CNA Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) Army (Department of the Army)	$102,136,862	0.6%	Rank history: #19 in FY2021, #20 in FY2022, #22 in FY2023 and #22 in FY2025; down 2 since FY2023.
25	Accenture Federal Services LLC 2 awardees Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) DOS (Department of State)	$88,395,887	0.5%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2025; new.
26	Leidos Holdings, Inc. 7 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) OSD (Office of the Secretary of Defense) DHA (Defense Health Agency)	$86,997,402	0.5%	Rank history: #20 in FY2021, #22 in FY2022, #23 in FY2023 and #36 in FY2025; down 3 since FY2023.
27	General Dynamics Corporation 5 awardees, including General Dynamics Information Technology, Inc., General Dynamics Mission Systems, Inc. and General Dynamics European Land Systems-Bridge Systems GMBH Top agencies Army (Department of the Army) DTRA (Defense Threat Reduction Agency) USAF (Department of the Air Force)	$85,255,080	0.5%	Rank history: #64 in FY2021, #55 in FY2022, #57 in FY2023 and #16 in FY2025; up 30 since FY2023.
28	Gzo, Inc. Top agencies USAF (Department of the Air Force)	$70,592,812	0.4%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023 and not on the FY2025 list; up 53 since FY2023.
29	Lockheed Martin Corporation 7 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$64,727,058	0.4%	Rank history: #69 in FY2021, not on the FY2022 list, #26 in FY2023 and #26 in FY2025; down 3 since FY2023.
30	Amentum Services, Inc. 5 awardees, including URS Federal Services International, Inc., PAE National Security Solutions LLC and Centra Technology, Inc. Top agencies Army (Department of the Army) DTRA (Defense Threat Reduction Agency) DARPA (Defense Advanced Research Projects Agency)	$64,248,069	0.4%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023 and not on the FY2025 list; down 15 since FY2023.
31	CACI International Inc. 2 awardees, including Caci, Inc. - Federal and Caci Nss, LLC Top agencies Army (Department of the Army) USSOCOM (United States Special Operations Command) OSD (Office of the Secretary of Defense)	$62,371,175	0.4%	Rank history: #27 in FY2021, #35 in FY2022, #53 in FY2023 and #17 in FY2025; up 22 since FY2023.
32	National Opinion Research Center Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation)	$62,349,155	0.4%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #39 in FY2025; up 12 since FY2023.
33	Strategic Analysis, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$56,979,643	0.4%	Rank history: #80 in FY2021, #61 in FY2022, #50 in FY2023 and #21 in FY2025; up 17 since FY2023.
34	UnitedHealth Group Incorporated 3 awardees, including Optumhealth Care Solutions, LLC Top agencies DHA (Defense Health Agency)	$56,330,433	0.4%	Rank history: #22 in FY2021, #21 in FY2022, not on the FY2023 list and #42 in FY2025; up 183 since FY2023.
35	Axle Informatics, LLC Top agencies HHS (Department of Health and Human Services)	$53,211,300	0.3%	Rank history: #74 in FY2021, #92 in FY2022, #72 in FY2023 and #66 in FY2025; up 37 since FY2023.
36	HII Mission Technologies Corp Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$49,945,942	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
37	Ptsi Managed Services Inc. Top agencies DOT (Department of Transportation) Army (Department of the Army)	$49,831,111	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
38	Creative Associates International, Inc. Top agencies USAID (US Agency for International Development)	$49,556,723	0.3%	Rank history: #97 in FY2021, #37 in FY2022, #29 in FY2023 and not on the FY2025 list; down 9 since FY2023.
39	Medical Access Uganda Limited Top agencies USAID (US Agency for International Development)	$47,376,390	0.3%	Rank history: not on the FY2021 list, #60 in FY2022, not on the FY2023 list and #96 in FY2025; up 97 since FY2023.
40	BAE Systems PLC Through BAE Systems Technology Solutions & Services Inc. Top agencies DHS (Department of Homeland Security)	$45,798,087	0.3%	Rank history: #48 in FY2021, #40 in FY2022, #42 in FY2023 and not on the FY2025 list; up 2 since FY2023.
41	Cyber Engineering and Technical Alliance, LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) USAID (US Agency for International Development)	$44,797,580	0.3%	Rank history: not on the FY2021 list, #94 in FY2022, #54 in FY2023 and #34 in FY2025; up 13 since FY2023.
42	Quality Health Strategies Inc. Through Qlarant Integrity Solutions LLC Top agencies HHS (Department of Health and Human Services)	$43,850,010	0.3%	Rank history: #26 in FY2021, #25 in FY2022, #25 in FY2023 and not on the FY2025 list; down 17 since FY2023.
43	Northrop Grumman Systems Corporation Top agencies USAF (Department of the Air Force)	$43,615,085	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
44	Celeen LLC Top agencies USAF (Department of the Air Force) DOD (Department of Defense) HHS (Department of Health and Human Services)	$43,509,835	0.3%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2025; new.
45	Kaiser Foundation Hospitals Top agencies HHS (Department of Health and Human Services)	$43,454,474	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
46	Palladium International LLC Top agencies USAID (US Agency for International Development)	$42,259,715	0.3%	Rank history: #23 in FY2021, #23 in FY2022, #24 in FY2023 and #52 in FY2025; down 22 since FY2023.
47	Asgn Incorporated Through ECS Federal, LLC Top agencies DARPA (Defense Advanced Research Projects Agency) Commerce (Department of Commerce) DOJ (Department of Justice)	$40,142,592	0.2%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2025; new.
48	Science Applications International Corporation 3 awardees, including Forfeiture Support Associates LLC Top agencies PBGC (Pension Benefit Guaranty Corporation) DTRA (Defense Threat Reduction Agency) DOJ (Department of Justice)	$39,559,430	0.2%	Rank history: #34 in FY2021, #43 in FY2022, #41 in FY2023 and not on the FY2025 list; down 7 since FY2023.
49	Hendall Inc. Top agencies HHS (Department of Health and Human Services)	$39,214,195	0.2%	Rank history: #55 in FY2021, #51 in FY2022, #47 in FY2023 and #81 in FY2025; down 2 since FY2023.
50	Tetra TECH ES, Inc. Top agencies USAID (US Agency for International Development)	$38,665,884	0.2%	Rank history: not on the FY2021–FY2023 lists and #70 in FY2025; new.
51	Pgls LLC Top agencies DOJ (Department of Justice) GSA (General Services Administration)	$38,555,805	0.2%	Rank history: #79 in FY2021, #59 in FY2022, #58 in FY2023 and #69 in FY2025; up 7 since FY2023.
52	Threat TEC - Yorktown JV, LLC Top agencies Army (Department of the Army)	$37,555,916	0.2%	Rank history: #52 in FY2021, #62 in FY2022, #61 in FY2023 and not on the FY2025 list; up 9 since FY2023.
53	Deloitte Consulting Limited Top agencies USAID (US Agency for International Development)	$36,537,743	0.2%	Rank history: not on the FY2021 list, #44 in FY2022, not on the FY2023 list and not on the FY2025 list; up 68 since FY2023.
54	Elizabeth Glaser Pediatric Aids Foundation Top agencies USAID (US Agency for International Development)	$36,529,091	0.2%	Rank history: not on the FY2021 list, #82 in FY2022, #59 in FY2023 and not on the FY2025 list; up 5 since FY2023.
55	Joint Medical Store Top agencies USAID (US Agency for International Development)	$36,417,703	0.2%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023 and not on the FY2025 list; up 12 since FY2023.
56	Management Sciences for Health Inc. Top agencies USAID (US Agency for International Development)	$35,969,899	0.2%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2023 and not on the FY2025 list; up 17 since FY2023.
57	The Boeing Company 6 awardees, including Boeing Aerospace Operations, Inc., Jeppesen Foreflight, Inc. and Liquid Robotics, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Commerce (Department of Commerce)	$34,324,218	0.2%	Rank history: #50 in FY2021, #99 in FY2022, #56 in FY2023 and #59 in FY2025; down 1 since FY2023.
58	Coventbridge (USA) LLC Top agencies HHS (Department of Health and Human Services)	$34,285,833	0.2%	Rank history: not on the FY2021–FY2023 lists and #49 in FY2025; new.
59	Dexis Interactive Incorporated Top agencies USAID (US Agency for International Development) DSCA (Defense Security Cooperation Agency)	$34,150,591	0.2%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023 and #60 in FY2025; up 24 since FY2023.
60	Qlarant Integrity Solutions LLC Top agencies HHS (Department of Health and Human Services)	$33,175,688	0.2%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2025; new.
61	Sos International LLC Top agencies DOJ (Department of Justice) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$32,894,852	0.2%	Rank history: #24 in FY2021, #79 in FY2022, #20 in FY2023 and #27 in FY2025; down 41 since FY2023.
62	American Type Culture Collection Top agencies HHS (Department of Health and Human Services)	$32,843,300	0.2%	Rank history: #94 in FY2021, #57 in FY2022, #69 in FY2023 and not on the FY2025 list; up 7 since FY2023.
63	Metlang LLC Top agencies DOJ (Department of Justice)	$32,491,039	0.2%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023 and #54 in FY2025; up 17 since FY2023.
64	KLD Associates Inc. Top agencies DOT (Department of Transportation)	$32,071,974	0.2%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; up 107 since FY2023.
65	Worldwide Language Resources, LLC Top agencies USSOCOM (United States Special Operations Command) Navy (Department of the Navy)	$30,932,307	0.2%	Rank history: #32 in FY2021, #72 in FY2022, not on the FY2023 list and #44 in FY2025; up 75 since FY2023.
66	DT Global LLC 2 awardees Top agencies USAID (US Agency for International Development) MCC (Millennium Challenge Corporation)	$30,761,323	0.2%	Rank history: not on the FY2021–FY2022 lists, #36 in FY2023 and #79 in FY2025; down 30 since FY2023.
67	Westat, Inc. 2 awardees Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation) VA (Department of Veterans Affairs)	$30,749,051	0.2%	Rank history: #31 in FY2021, #26 in FY2022, #37 in FY2023 and #58 in FY2025; down 30 since FY2023.
68	Riverside Research Institute Top agencies USAF (Department of the Air Force)	$30,510,729	0.2%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2025; new.
69	Bryce Space and Technology, LLC Top agencies HHS (Department of Health and Human Services)	$30,396,108	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 118 since FY2023.
70	Atlas Advisors LLC Top agencies DOS (Department of State) Navy (Department of the Navy)	$30,198,032	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 40 since FY2023.
71	Noridian Healthcare Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$30,063,725	0.2%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2025; new.
72	Calibre Systems Inc. Top agencies Army (Department of the Army)	$29,983,093	0.2%	Rank history: #46 in FY2021, #71 in FY2022, #60 in FY2023 and #73 in FY2025; down 12 since FY2023.
73	Systems Planning and Analysis, Inc. Top agencies OSD (Office of the Secretary of Defense) USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service)	$29,012,570	0.2%	Rank history: #61 in FY2021, #69 in FY2022, #51 in FY2023 and #40 in FY2025; down 22 since FY2023.
74	Encompass LLC Top agencies USAID (US Agency for International Development)	$28,626,253	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 68 since FY2023.
75	The Mission Essential Group, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$28,538,698	0.2%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023 and #75 in FY2025; up 20 since FY2023.
76	International Business Initiatives LLC Top agencies USAID (US Agency for International Development)	$27,838,991	0.2%	Rank history: not on the FY2021–FY2022 lists, #96 in FY2023 and not on the FY2025 list; up 20 since FY2023.
77	Path Top agencies USAID (US Agency for International Development)	$27,430,806	0.2%	Rank history: not on the FY2021–FY2023 lists and #14 in FY2025; up 342 since FY2023.
78	Makwa Global Security Solutions, LLC Top agencies DOS (Department of State)	$27,034,979	0.2%	Rank history: not on the FY2021–FY2022 lists, #93 in FY2023 and not on the FY2025 list; up 15 since FY2023.
79	Goldbelt C6, LLC Top agencies HHS (Department of Health and Human Services) DOS (Department of State)	$26,838,872	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
80	Eagle Integrated Services, LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$26,751,117	0.2%	Rank history: not on the FY2021 list, #78 in FY2022, #79 in FY2023 and #72 in FY2025; down 1 since FY2023.
81	Agile Decision Sciences, LLC Top agencies EPA (Environmental Protection Agency) DHA (Defense Health Agency) DOJ (Department of Justice)	$26,440,178	0.2%	Rank history: not on the FY2021–FY2022 lists, #65 in FY2023 and not on the FY2025 list; down 16 since FY2023.
82	Linquest Corporation Top agencies USAF (Department of the Air Force)	$25,939,930	0.2%	Rank history: #87 in FY2021, #89 in FY2022, #70 in FY2023 and #68 in FY2025; down 12 since FY2023.
83	Analytic Services Inc. Top agencies OSD (Office of the Secretary of Defense)	$25,875,210	0.2%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2025; up 35 since FY2023.
84	Mpf-Zai Solutions LLC Top agencies HHS (Department of Health and Human Services)	$25,791,787	0.2%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and not on the FY2025 list; up 2 since FY2023.
85	Filius Corporation Top agencies USAF (Department of the Air Force)	$25,647,340	0.2%	Rank history: not on the FY2021 list, #93 in FY2022, not on the FY2023 list and not on the FY2025 list; up 108 since FY2023.
86	Fgs, LLC Top agencies Navy (Department of the Navy)	$25,096,362	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 31 since FY2023.
87	Blue Cross and Blue Shield of South Carolina Through Karna LLC Top agencies HHS (Department of Health and Human Services)	$24,835,177	0.2%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2023 and #45 in FY2025; up 3 since FY2023.
88	National Marrow Donor Program Top agencies HHS (Department of Health and Human Services)	$24,673,374	0.2%	Rank history: not on the FY2021 list, #84 in FY2022, #89 in FY2023 and #74 in FY2025; up 1 since FY2023.
89	HP Enterprise Services LLC 2 awardees, including Safeguard Services LLC and Peraton Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$24,247,760	0.2%	Rank history: not on the FY2021 list, #31 in FY2022, #31 in FY2023 and not on the FY2025 list; down 58 since FY2023.
90	People, Technology and Processes, LLC Top agencies USSOCOM (United States Special Operations Command)	$24,018,106	0.1%	Rank history: not on the FY2021–FY2023 lists and #63 in FY2025; up 15 since FY2023.
91	Winrock International Institute for Agricultural Development Top agencies USAID (US Agency for International Development)	$23,591,410	0.1%	Rank history: #95 in FY2021, not on the FY2022 list, #87 in FY2023 and not on the FY2025 list; down 4 since FY2023.
92	Actionable Solutions Group, LLC Top agencies USSOCOM (United States Special Operations Command)	$23,355,280	0.1%	Rank history: #59 in FY2021, #34 in FY2022, #46 in FY2023 and not on the FY2025 list; down 46 since FY2023.
93	G D Arab Limited Company Top agencies Army (Department of the Army)	$23,348,008	0.1%	Rank history: not on the FY2021 list, #90 in FY2022, not on the FY2023 list and #100 in FY2025; up 10 since FY2023.
94	The Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies USAID (US Agency for International Development) OSD (Office of the Secretary of Defense) HHS (Department of Health and Human Services)	$23,107,450	0.1%	Rank history: #8 in FY2021, #12 in FY2022, #10 in FY2023 and not on the FY2025 list; down 84 since FY2023.
95	Mantech International Corporation Through Mantech SRS Technologies, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) Navy (Department of the Navy)	$22,978,368	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 25 since FY2023.
96	Telaforce LLC Top agencies DOL (Department of Labor)	$22,965,006	0.1%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2023 and not on the FY2025 list; down 11 since FY2023.
97	Ocean Bay Information and Systems Management, LLC Top agencies DOJ (Department of Justice)	$22,940,789	0.1%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2025; new.
98	Vertex Modernization and Sustainment LLC Top agencies USAF (Department of the Air Force)	$22,871,156	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 34 since FY2023.
99	Global Connections To Employment, Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency)	$22,619,974	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 111 since FY2023.
100	National Association of State Mental Health Program Directors Inc. Top agencies HHS (Department of Health and Human Services)	$22,358,314	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, #99 in FY2023 and not on the FY2025 list; down 1 since FY2023.

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100 of 4,271 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5419

Code	Net obligations	Largest contractor
54199 All Other Professional, Scientific, and Technical Services	$14,428,846,056	Battelle Memorial Institute
54193 Translation and Interpretation Services	$437,756,527	Pgls LLC
54191 Marketing Research and Public Opinion Polling	$229,093,860	National Opinion Research Center
54194 Veterinary Services	$105,188,505	Priority One Services, Inc.
54192 Photographic Services	$3,733,148	Kreative Marketing Strategies 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 $16.1 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 NAICS 5419 contractors in FY2024?

1. Battelle Memorial Institute ($1.06B), 2. Battelle Energy Alliance, LLC ($803M), 3. The Mitre Corporation ($753M), 4. Sierra Nevada Company, LLC ($731M), 5. RTX Corporation ($410M), 6. Oak Ridge Associated Universities, Incorporated ($404M), 7. DAI Global LLC ($333M), 8. Booz Allen Hamilton Holding Corporation ($326M), 9. Institute for Defense Analyses ($271M), 10. Huntington Ingalls Industries, Inc. ($265M).

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