Top 100 Contractors in NAICS 541690: Other Scientific and Technical Consulting Services, FY2025

Name: Top 100 Contractors in NAICS 541690: Other Scientific and Technical Consulting Services, FY2025
Creator: GovTribe

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

The top 10 won 31% of FY2025 NAICS 541690 contract dollars

Contract obligations: $2,214,498,635 Net of deobligations, by contracts coded NAICS 541690
Contractors: 921 Parent companies with an obligation
Largest contractor: Parsons Corporation $152 million, 6.2% 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	Parsons Corporation Through Parsons Government Services Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$152,394,448	6.2%	Rank history: not on the FY2021–FY2022 lists, #26 in FY2023 and #7 in FY2024; up 6 since FY2024.
2	Lockheed Martin Corporation 4 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$131,546,041	5.3%	Rank history: #2 in FY2021, #2 in FY2022, #2 in FY2023 and #1 in FY2024; down 1 since FY2024.
3	General Dynamics Corporation 3 awardees, including General Dynamics One Source LLC and General Dynamics Information Technology, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$120,638,903	4.9%	Rank history: #6 in FY2021, #15 in FY2022, #12 in FY2023 and #3 in FY2024; unchanged since FY2024.
4	Kelly Services, Inc. Top agencies HHS (Department of Health and Human Services)	$105,890,884	4.3%	Rank history: not on the FY2021 list, #49 in FY2022, not on the FY2023 list and #2 in FY2024; down 2 since FY2024.
5	System High Corporation Top agencies DARPA (Defense Advanced Research Projects Agency) MDA (DOD Missile Defense Agency)	$55,085,294	2.2%	Rank history: not on the FY2021 list, #9 in FY2022, #7 in FY2023 and #6 in FY2024; up 1 since FY2024.
6	Research Triangle Institute Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$46,974,163	1.9%	Rank history: not on the FY2021 list, #65 in FY2022, #30 in FY2023 and #14 in FY2024; up 8 since FY2024.
7	ManTech International Corporation Through Mantech Advanced Systems International, Inc. Top agencies USAF (Department of the Air Force)	$39,645,287	1.6%	Rank history: #4 in FY2021, #4 in FY2022, #8 in FY2023 and #13 in FY2024; up 6 since FY2024.
8	Tetra TECH ES, Inc. Top agencies USAID (US Agency for International Development) MCC (Millennium Challenge Corporation)	$39,404,846	1.6%	Rank history: not on the FY2021–FY2023 lists and #91 in FY2024; up 83 since FY2024.
9	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$36,277,250	1.5%	Rank history: #84 in FY2021, #17 in FY2022, #5 in FY2023 and #5 in FY2024; down 4 since FY2024.
10	Michael Stapleton Associates, Ltd. Top agencies DOS (Department of State)	$32,787,264	1.3%	Rank history: #7 in FY2021, #16 in FY2022, #14 in FY2023 and #12 in FY2024; up 2 since FY2024.
11	KBR Wyle Services LLC 2 awardees, including Dependable Global Solutions, LLC Top agencies DOE (Department of Energy) NASA (National Aeronautics and Space Administration)	$32,109,974	1.3%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2024; up 9 since FY2024.
12	Axle Informatics, LLC Top agencies HHS (Department of Health and Human Services)	$32,040,139	1.3%	Rank history: #57 in FY2021, #13 in FY2022, #9 in FY2023 and #11 in FY2024; down 1 since FY2024.
13	Unwin Co Top agencies DOE (Department of Energy)	$31,045,984	1.3%	Rank history: #10 in FY2021, #7 in FY2022, #6 in FY2023 and #9 in FY2024; down 4 since FY2024.
14	Gap Solutions, Inc. Top agencies HHS (Department of Health and Human Services)	$28,900,452	1.2%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; up 8 since FY2024.
15	Pundir Group, Inc. Top agencies GSA (General Services Administration) Navy (Department of the Navy) AOUSC (Administrative Office of the U.S. Courts)	$23,457,688	0.9%	Rank history: not on the FY2021 list, #67 in FY2022, #44 in FY2023 and #29 in FY2024; up 14 since FY2024.
16	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$23,083,707	0.9%	Rank history: #3 in FY2021, #28 in FY2022, #19 in FY2023 and #23 in FY2024; up 7 since FY2024.
17	WSP USA Environment & Infrastructure Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$21,744,380	0.9%	Rank history: not on the FY2021–FY2023 lists and #40 in FY2024; up 23 since FY2024.
18	Deloitte 2 awardees, including Deloitte Consulting LLP Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) USTDA (United States Trade and Development Agency)	$21,109,668	0.9%	Rank history: not on the FY2021–FY2023 lists and #41 in FY2024; up 23 since FY2024.
19	RMC 2021 LLC Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$19,866,332	0.8%	Rank history: #39 in FY2021, #11 in FY2022, #15 in FY2023 and #28 in FY2024; up 9 since FY2024.
20	Ameresco Inc. Through Ameresco Select, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$19,537,311	0.8%	Rank history: #14 in FY2021, #25 in FY2022, #28 in FY2023 and #31 in FY2024; up 11 since FY2024.
21	RTX Corporation 2 awardees, including Raytheon Company Top agencies USAF (Department of the Air Force)	$19,004,513	0.8%	Rank history: not on the FY2021–FY2023 lists and #26 in FY2024; up 5 since FY2024.
22	Janus Research Group, LLC Top agencies Army (Department of the Army)	$18,739,128	0.8%	Rank history: not on the FY2021 list, #20 in FY2022, #18 in FY2023 and #21 in FY2024; down 1 since FY2024.
23	Essex Management LLC Top agencies HHS (Department of Health and Human Services)	$18,269,296	0.7%	Rank history: #22 in FY2021, #22 in FY2022, #21 in FY2023 and #27 in FY2024; up 4 since FY2024.
24	Hdr, Inc. 2 awardees, including HDR Environmental, Operations and Construction, Inc. Top agencies Navy (Department of the Navy)	$17,491,291	0.7%	Rank history: #29 in FY2021, #45 in FY2022, #49 in FY2023 and #25 in FY2024; up 1 since FY2024.
25	Nana Regional Corporation Inc. 5 awardees, including Akima Data Management LLC and TKC Global Solutions, LLC Top agencies DTRA (Defense Threat Reduction Agency) DOE (Department of Energy)	$17,313,543	0.7%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2024; up 21 since FY2024.
26	Battelle Memorial Institute Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) Army (Department of the Army)	$15,976,275	0.6%	Rank history: #33 in FY2021, #31 in FY2022, #40 in FY2023 and #32 in FY2024; up 6 since FY2024.
27	Kegman Inc. Top agencies USAF (Department of the Air Force)	$14,984,655	0.6%	Rank history: #69 in FY2021, #54 in FY2022, #35 in FY2023 and #34 in FY2024; up 7 since FY2024.
28	Goldbelt Professional Services, LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$14,265,303	0.6%	Rank history: not on the FY2021–FY2023 lists and #81 in FY2024; up 53 since FY2024.
29	Dboc Joint Venture Top agencies Army (Department of the Army)	$14,246,020	0.6%	Rank history: not on the FY2021 list, #34 in FY2022, #4 in FY2023 and not on the FY2024 list; returned.
30	Yale New Haven Health Services Corporation Top agencies HHS (Department of Health and Human Services)	$13,327,307	0.5%	Rank history: #15 in FY2021, #19 in FY2022, #23 in FY2023 and #30 in FY2024; unchanged since FY2024.
31	ABT Global LLC Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development)	$12,929,546	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
32	Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies USAF (Department of the Air Force) DOS (Department of State) HHS (Department of Health and Human Services)	$12,924,434	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
33	Fedwriters, Inc. Top agencies Commerce (Department of Commerce) Navy (Department of the Navy)	$12,465,252	0.5%	Rank history: not on the FY2021 list, #83 in FY2022, #78 in FY2023 and #61 in FY2024; up 28 since FY2024.
34	Guidehouse Digital LLC Top agencies HHS (Department of Health and Human Services)	$12,221,855	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
35	Tatitlek Government Services, LLC Top agencies DOS (Department of State)	$12,194,566	0.5%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2024; up 31 since FY2024.
36	Olgoonik Solutions LLC Top agencies DOS (Department of State)	$12,059,941	0.5%	Rank history: not on the FY2021–FY2024 lists; up 69 since FY2024.
37	National Opinion Research Center Top agencies HHS (Department of Health and Human Services)	$11,882,908	0.5%	Rank history: #64 in FY2021, not on the FY2022 list, #32 in FY2023 and #50 in FY2024; up 13 since FY2024.
38	Noblis, Inc. Top agencies Army (Department of the Army)	$11,501,176	0.5%	Rank history: #59 in FY2021, #30 in FY2022, #41 in FY2023 and #36 in FY2024; down 2 since FY2024.
39	Science Applications International Corporation Top agencies DOT (Department of Transportation)	$10,635,291	0.4%	Rank history: #31 in FY2021, #42 in FY2022, #46 in FY2023 and #60 in FY2024; up 21 since FY2024.
40	Arctic Slope Regional Corporation 4 awardees, including Broadleaf, Inc., Asrc Federal Facilities Logistics LLC and Asrc Federal Technology Solutions, LLC Top agencies Army (Department of the Army) OSD (Office of the Secretary of Defense) CFTC (Commodity Futures Trading Commission)	$10,364,151	0.4%	Rank history: not on the FY2021–FY2023 lists and #92 in FY2024; up 52 since FY2024.
41	Vantor Services Inc. Top agencies USSOCOM (United States Special Operations Command)	$9,247,430	0.4%	Rank history: not on the FY2021–FY2024 lists; up 134 since FY2024.
42	K2 Group, Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$9,096,653	0.4%	Rank history: #61 in FY2021, #64 in FY2022, not on the FY2023 list and #59 in FY2024; up 17 since FY2024.
43	Cherokee Insights LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$8,859,224	0.4%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023 and #55 in FY2024; up 12 since FY2024.
44	The Brattle Group Inc Top agencies Treasury (Department of the Treasury) FTC (Federal Trade Commission)	$8,774,862	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
45	MRIGLOBAL Top agencies HHS (Department of Health and Human Services)	$8,611,604	0.3%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023 and #54 in FY2024; up 9 since FY2024.
46	Mathematica Inc. Top agencies HHS (Department of Health and Human Services)	$8,444,289	0.3%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2024; down 4 since FY2024.
47	American Institutes for Research In the Behavioral Sciences Top agencies HHS (Department of Health and Human Services)	$8,412,977	0.3%	Rank history: #95 in FY2021, #78 in FY2022, #70 in FY2023 and #52 in FY2024; up 5 since FY2024.
48	Chippewa Government Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$8,340,216	0.3%	Rank history: not on the FY2021–FY2022 lists, #47 in FY2023 and #62 in FY2024; up 14 since FY2024.
49	Swmg Productions Inc. Top agencies Army (Department of the Army)	$8,277,969	0.3%	Rank history: #55 in FY2021, #55 in FY2022, not on the FY2023 list and #74 in FY2024; up 25 since FY2024.
50	Mobius Consulting LLC Top agencies MDA (DOD Missile Defense Agency)	$8,151,365	0.3%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 50 since FY2024.
51	Global Engineering & Technology Inc Top agencies DOE (Department of Energy)	$7,593,468	0.3%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023 and #57 in FY2024; up 6 since FY2024.
52	Technology Security Associates, Inc. Top agencies Navy (Department of the Navy)	$7,455,317	0.3%	Rank history: #67 in FY2021, #60 in FY2022, #64 in FY2023 and #43 in FY2024; down 9 since FY2024.
53	DT Global LLC Top agencies USAID (US Agency for International Development)	$7,450,000	0.3%	Rank history: not on the FY2021–FY2024 lists; up 114 since FY2024.
54	Kennell & Associates Inc. Top agencies DHA (Defense Health Agency)	$7,254,415	0.3%	Rank history: #70 in FY2021, #75 in FY2022, #69 in FY2023 and #67 in FY2024; up 13 since FY2024.
55	Chinook Systems Inc. Top agencies WHS (DOD Washington Headquarters Service) OSD (Office of the Secretary of Defense) GSA (General Services Administration)	$7,243,289	0.3%	Rank history: not on the FY2021–FY2023 lists and #76 in FY2024; up 21 since FY2024.
56	A.i.s., Inc. Top agencies Commerce (Department of Commerce)	$6,989,761	0.3%	Rank history: #83 in FY2021, not on the FY2022–FY2023 lists and #99 in FY2024; up 43 since FY2024.
57	Berkeley Research Group, LLC Top agencies FTC (Federal Trade Commission) DOL (Department of Labor)	$6,817,186	0.3%	Rank history: not on the FY2021–FY2024 lists; up 219 since FY2024.
58	Acumen LLC Top agencies HHS (Department of Health and Human Services)	$6,753,769	0.3%	Rank history: #25 in FY2021, #21 in FY2022, #27 in FY2023 and #35 in FY2024; down 23 since FY2024.
59	National Academy of Sciences Top agencies VA (Department of Veterans Affairs) OSD (Office of the Secretary of Defense) Commerce (Department of Commerce)	$6,169,368	0.2%	Rank history: #9 in FY2021, #18 in FY2022, #11 in FY2023 and #19 in FY2024; down 40 since FY2024.
60	S.P. Cramer & Associates, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$6,117,631	0.2%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2023 and #79 in FY2024; up 19 since FY2024.
61	Bastion Technologies, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$5,967,820	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
62	Health Services Advisory Group, Inc. Top agencies HHS (Department of Health and Human Services)	$5,841,797	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
63	Deck Prism LLC Top agencies DOE (Department of Energy)	$5,781,066	0.2%	Rank history: not on the FY2021–FY2024 lists; up 278 since FY2024.
64	22Nd Century Technologies, Inc. Top agencies HHS (Department of Health and Human Services)	$5,760,889	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #57 in FY2023 and not on the FY2024 list; returned.
65	Systex, Inc. Top agencies HHS (Department of Health and Human Services)	$5,694,981	0.2%	Rank history: #79 in FY2021, #89 in FY2022, #79 in FY2023 and #82 in FY2024; up 17 since FY2024.
66	Aerovironment, Inc. Through Bluehalo LLC Top agencies Army (Department of the Army)	$5,643,331	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
67	CDM Federal Programs Corporation Top agencies DHS (Department of Homeland Security)	$5,601,266	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2024; up 4 since FY2024.
68	Asgn Incorporated Through ECS Federal, LLC Top agencies DOJ (Department of Justice)	$5,149,763	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
69	Maximus Federal Services, Inc. Top agencies OPM (Office of Personnel Management)	$4,976,046	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
70	Nathan Associates LLC Top agencies USAID (US Agency for International Development)	$4,950,000	0.2%	Rank history: not on the FY2021 list, #53 in FY2022, #48 in FY2023 and #97 in FY2024; up 27 since FY2024.
71	Rainmakers Strategic Solutions LLC Top agencies HHS (Department of Health and Human Services)	$4,903,454	0.2%	Rank history: not on the FY2021–FY2023 lists and #85 in FY2024; up 14 since FY2024.
72	Sancorp Consulting, LLC Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$4,695,548	0.2%	Rank history: not on the FY2021–FY2024 lists; up 32 since FY2024.
73	Float Partners LLC Top agencies Commerce (Department of Commerce)	$4,687,596	0.2%	Rank history: not on the FY2021–FY2023 lists and #93 in FY2024; up 20 since FY2024.
74	Academi Training Center LLC Top agencies DOS (Department of State)	$4,673,689	0.2%	Rank history: not on the FY2021–FY2024 lists; up 75 since FY2024.
75	Kranze Technology Solutions Inc. Top agencies USSOCOM (United States Special Operations Command)	$4,486,671	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
76	Tigua Technology Services, Inc. Top agencies Navy (Department of the Navy)	$4,483,120	0.2%	Rank history: not on the FY2021–FY2024 lists; up 52 since FY2024.
77	Identification Technology Partners Inc. Top agencies DHS (Department of Homeland Security)	$4,462,549	0.2%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and not on the FY2024 list; up 26 since FY2024.
78	Republic Mission Systems, Inc. Top agencies Army (Department of the Army)	$4,399,040	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
79	W R Systems Ltd. Top agencies Navy (Department of the Navy)	$4,366,630	0.2%	Rank history: #53 in FY2021, not on the FY2022–FY2023 lists and #58 in FY2024; down 21 since FY2024.
80	Chickasaw Business Solutions, LLC Top agencies USDA (Department of Agriculture)	$4,364,839	0.2%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and not on the FY2024 list; up 110 since FY2024.
81	CCS Associates, Inc. Top agencies HHS (Department of Health and Human Services)	$4,315,493	0.2%	Rank history: #60 in FY2021, #82 in FY2022, #89 in FY2023 and #80 in FY2024; down 1 since FY2024.
82	Goldbelt Frontier, LLC Top agencies DHA (Defense Health Agency)	$4,160,904	0.2%	Rank history: #80 in FY2021, #96 in FY2022 and not on the FY2023–FY2024 lists; up 24 since FY2024.
83	Comsetra LLC Top agencies USAF (Department of the Air Force)	$4,072,349	0.2%	Rank history: #78 in FY2021 and not on the FY2022–FY2024 lists; returned.
84	Mission Technology Top agencies NASA (National Aeronautics and Space Administration)	$4,040,618	0.2%	Rank history: #87 in FY2021 and not on the FY2022–FY2024 lists; up 38 since FY2024.
85	Agile It Synergy, LLC Top agencies Navy (Department of the Navy)	$4,021,977	0.2%	Rank history: not on the FY2021–FY2024 lists; up 91 since FY2024.
86	Riverside Research Institute Top agencies USAF (Department of the Air Force)	$3,977,613	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
87	Venergy Group LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DOI (Department of the Interior)	$3,961,694	0.2%	Rank history: not on the FY2021–FY2024 lists; up 44 since FY2024.
88	Palladium International LLC Top agencies USAID (US Agency for International Development)	$3,947,563	0.2%	Rank history: #11 in FY2021, #3 in FY2022, #22 in FY2023 and #17 in FY2024; down 71 since FY2024.
89	D7, LLC Top agencies DTRA (Defense Threat Reduction Agency) USAF (Department of the Air Force)	$3,884,651	0.2%	Rank history: not on the FY2021–FY2024 lists; up 57 since FY2024.
90	The CNA Corporation Top agencies DHS (Department of Homeland Security)	$3,842,844	0.2%	Rank history: not on the FY2021–FY2024 lists; up 25 since FY2024.
91	Sol Engineering Services, LLC Top agencies Army (Department of the Army)	$3,782,972	0.2%	Rank history: not on the FY2021–FY2024 lists; up 34 since FY2024.
92	Phigenics LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$3,763,243	0.2%	Rank history: not on the FY2021–FY2024 lists; up 64 since FY2024.
93	Acc3 International Incorporated Top agencies USAF (Department of the Air Force)	$3,617,641	0.1%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2024; down 3 since FY2024.
94	UEI F1D1GLREXKW5 Top agencies Navy (Department of the Navy)	$3,482,951	0.1%	Rank history: #76 in FY2021, #94 in FY2022, #93 in FY2023 and #98 in FY2024; up 4 since FY2024.
95	JBW Feditc JV LLC Top agencies Army (Department of the Army)	$3,443,951	0.1%	Rank history: not on the FY2021–FY2024 lists; up 32 since FY2024.
96	Rivit Alliance LLC Top agencies HHS (Department of Health and Human Services)	$3,438,828	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
97	Bowhead Marine Support Services, LLC Top agencies Navy (Department of the Navy)	$3,211,864	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
98	Gulf South Research Corp Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense) Army (Department of the Army)	$3,208,889	0.1%	Rank history: not on the FY2021–FY2024 lists; up 46 since FY2024.
99	Regents of the University of Michigan Top agencies HHS (Department of Health and Human Services) NRC (Nuclear Regulatory Commission) Smithsonian (Smithsonian Institution)	$3,184,040	0.1%	Rank history: #93 in FY2021, #98 in FY2022, #72 in FY2023 and #95 in FY2024; down 4 since FY2024.
100	Msmm Engineering, LLC Top agencies Army (Department of the Army)	$3,114,245	0.1%	Rank history: not on the FY2021–FY2024 lists; up 17 since FY2024.

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100 of 921 contractors listed here. See the rest on GovTribe.

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 $2.47 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 NAICS 541690 contractors in FY2025?

1. Parsons Corporation ($152M), 2. Lockheed Martin Corporation ($132M), 3. General Dynamics Corporation ($121M), 4. Kelly Services, Inc. ($106M), 5. System High Corporation ($55.1M), 6. Research Triangle Institute ($47M), 7. ManTech International Corporation ($39.6M), 8. Tetra TECH ES, Inc. ($39.4M), 9. Chemonics International, Inc. ($36.3M), 10. Michael Stapleton Associates, Ltd. ($32.8M).

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