Top 100 Contractors in NAICS 541: Professional, Scientific, and Technical Services, FY2021

Name: Top 100 Contractors in NAICS 541: Professional, Scientific, and Technical Services, FY2021
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 23% of FY2021 NAICS 541 contract dollars

Contract obligations: $188,873,669,154 Net of deobligations, by contracts coded NAICS 541 or a code under it
Contractors: 21,478 Parent companies with an obligation
Largest contractor: General Dynamics Corporation $7.1 billion, 3.6% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	General Dynamics Corporation 53 awardees, including Electric Boat Corporation, General Dynamics Information Technology, Inc. and Csra LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DHS (Department of Homeland Security)	$7,099,357,359	3.6%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Lockheed Martin Corporation 54 awardees Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency) Navy (Department of the Navy)	$6,650,830,743	3.3%	Rank history: #2 in FY2022, #2 in FY2023, #3 in FY2024 and #2 in FY2025; up 1 since FY2020.
3	Booz Allen Hamilton Holding Corporation 13 awardees, including Booz Allen Hamilton Inc., Liberty It Solutions LLC and Booz Allen Hamilton Engineering Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) VA (Department of Veterans Affairs)	$5,733,980,819	2.9%	Rank history: #4 in FY2022, #3 in FY2023, #2 in FY2024 and #3 in FY2025; down 1 since FY2020.
4	Leidos Holdings, Inc. 39 awardees, including Leidos, Inc., Leidos Biomedical Research Inc. and Dynetics, Inc. Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) Navy (Department of the Navy)	$5,725,443,894	2.9%	Rank history: #3 in FY2022, #4 in FY2023, #4 in FY2024 and #4 in FY2025; unchanged since FY2020.
5	Northrop Grumman Corporation 68 awardees, including Northrop Grumman Systems Corporation and Orbital Sciences LLC Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency) Navy (Department of the Navy)	$4,766,430,745	2.4%	Rank history: #7 in FY2022, #5 in FY2023, #6 in FY2024 and #6 in FY2025; up 1 since FY2020.
6	RTX Corporation 82 awardees, including Raytheon Company Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$4,621,962,407	2.3%	Rank history: #5 in FY2022, #9 in FY2023, #11 in FY2024 and #11 in FY2025; up 8 since FY2020.
7	Science Applications International Corporation 18 awardees, including Forfeiture Support Associates LLC, Engility Services, LLC and Halfaker and Associates, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$3,516,624,858	1.8%	Rank history: #6 in FY2022, #6 in FY2023, #5 in FY2024 and #7 in FY2025; unchanged since FY2020.
8	Fluor Corporation 4 awardees, including Fluor Marine Propulsion, LLC, Fluor Enterprises, Inc. and Fluor Intercontinental, Inc. Top agencies DOE (Department of Energy) Navy (Department of the Navy) DHS (Department of Homeland Security)	$3,073,389,212	1.5%	Rank history: #8 in FY2022, #7 in FY2023, #7 in FY2024 and #8 in FY2025; up 21 since FY2020.
9	CACI International Inc. 31 awardees, including Caci, Inc. - Federal, Caci Nss, LLC and Caci Technologies, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$2,758,384,345	1.4%	Rank history: #9 in FY2022, #8 in FY2023, #9 in FY2024 and #5 in FY2025; up 2 since FY2020.
10	Deloitte LLP 5 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury) DHS (Department of Homeland Security)	$2,685,650,789	1.3%	Rank history: #12 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
11	The Mitre Corporation 2 awardees Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense) HHS (Department of Health and Human Services)	$2,433,242,388	1.2%	Rank history: #11 in FY2022, #10 in FY2023, #14 in FY2024 and #18 in FY2025; down 3 since FY2020.
12	The Boeing Company 43 awardees, including Insitu, Inc. Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$2,433,201,702	1.2%	Rank history: #16 in FY2022, #20 in FY2023, #16 in FY2024 and #23 in FY2025; up 1 since FY2020.
13	California Institute of Technology 2 awardees Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) DARPA (Defense Advanced Research Projects Agency)	$2,299,509,193	1.2%	Rank history: #10 in FY2022, #12 in FY2023, #12 in FY2024 and #14 in FY2025; down 4 since FY2020.
14	Accenture Federal Services LLC 6 awardees, including ASM Research, LLC, Accenture LLP and Avanade Inc. Top agencies VA (Department of Veterans Affairs) DOE (Department of Energy) DHS (Department of Homeland Security)	$2,240,477,260	1.1%	Rank history: #17 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
15	Jacobs Engineering Group Inc. 47 awardees, including Amentum Technology, Inc., Ch2M Hill, Inc. and Ch2M Hill - CDM Pa-Tac Recovery Services Top agencies NASA (National Aeronautics and Space Administration) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$1,937,123,504	1.0%	Rank history: #15 in FY2022, #21 in FY2023, #84 in FY2024 and not on the FY2025 list; up 2 since FY2020.
16	Battelle Memorial Institute 9 awardees, including Battelle Energy Alliance, LLC, Battelle National Biodefense Institute, LLC and Battelle Savannah River Alliance, LLC Top agencies DOE (Department of Energy) OSD (Office of the Secretary of Defense) HHS (Department of Health and Human Services)	$1,705,617,322	0.9%	Rank history: #14 in FY2022, #48 in FY2023, #22 in FY2024 and #15 in FY2025; up 10 since FY2020.
17	L3Harris Technologies, Inc. 57 awardees, including L3Harris Technologies Integrated Systems L.P., L3 Technologies, Inc. and CAE USA Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Commerce (Department of Commerce)	$1,652,921,075	0.8%	Rank history: #18 in FY2022, #19 in FY2023, #19 in FY2024 and #21 in FY2025; up 2 since FY2020.
18	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$1,595,539,091	0.8%	Rank history: #20 in FY2022, #27 in FY2023, #21 in FY2024 and #29 in FY2025; down 6 since FY2020.
19	Dell Federal Systems L.P. 5 awardees, including EMC Corporation and Dell Marketing L.P. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$1,389,580,988	0.7%	Rank history: #36 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
20	The Johns Hopkins University 3 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency) OSD (Office of the Secretary of Defense)	$1,335,865,308	0.7%	Rank history: #19 in FY2022, #16 in FY2023, #78 in FY2024 and not on the FY2025 list; unchanged since FY2020.
21	Kbr, Inc. 15 awardees, including KBR Wyle Services, LLC Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) USAF (Department of the Air Force)	$1,232,721,144	0.6%	Rank history: #24 in FY2022, #22 in FY2023, #76 in FY2024 and not on the FY2025 list; up 7 since FY2020.
22	Perspecta Inc. 12 awardees, including Peraton Enterprise Solutions LLC, Peraton Technology Services Inc. and Dhpc Technologies, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$1,208,716,211	0.6%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
23	Massachusetts Institute of Technology 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$1,159,729,271	0.6%	Rank history: #23 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
24	The Aerospace Corporation Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration) DOE (Department of Energy)	$1,153,452,523	0.6%	Rank history: #26 in FY2022, #28 in FY2023, #23 in FY2024 and #25 in FY2025; down 1 since FY2020.
25	Mantech International Corporation 14 awardees, including Mantech Advanced Systems International, Inc., Mantech SRS Technologies, Inc. and Tapestry Technologies, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) Navy (Department of the Navy)	$1,075,014,452	0.5%	Rank history: #22 in FY2022, #37 in FY2023, #45 in FY2024 and #37 in FY2025; up 5 since FY2020.
26	International Business Machines Corporation 12 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$1,024,935,921	0.5%	Rank history: #35 in FY2022, #36 in FY2023, #28 in FY2024 and #32 in FY2025; up 17 since FY2020.
27	Parsons Corporation 22 awardees, including Parsons Government Services Inc., Polaris Alpha, LLC and Space Ground System Solutions, Inc. Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) DOT (Department of Transportation)	$1,004,973,707	0.5%	Rank history: #27 in FY2022, #29 in FY2023, #27 in FY2024 and #22 in FY2025; up 6 since FY2020.
28	Cerner Corporation 3 awardees, including Oracle Health Government Services, Inc. and Cerner Federal Solutions LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Army (Department of the Army)	$985,948,314	0.5%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
29	Alion Science and Technology Corporation 5 awardees, including HII Mission Technologies Corp Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$963,600,481	0.5%	Rank history: #85 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
30	CGI Technologies and Solutions Inc. 3 awardees, including CGI Federal Inc. Top agencies DOS (Department of State) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$937,351,173	0.5%	Rank history: #29 in FY2022, #34 in FY2023, #70 in FY2024 and not on the FY2025 list; up 6 since FY2020.
31	BAE Systems PLC 23 awardees, including BAE Systems Technology Solutions & Services Inc., BAE Systems Land & Armaments L.P. and BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DOJ (Department of Justice)	$904,779,456	0.5%	Rank history: #25 in FY2022, #18 in FY2023, #17 in FY2024 and #19 in FY2025; down 7 since FY2020.
32	Nana Regional Corporation Inc 18 awardees, including Affigent, LLC, Sava Workforce Solutions LLC and Rivertech LLC Top agencies DOJ (Department of Justice) Army (Department of the Army) USAF (Department of the Air Force)	$787,147,910	0.4%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
33	Serco North America (Holdings) Inc 8 awardees, including Serco Inc., Serco-Ips Corporation and Whitney Bradley & Brown, Inc. Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$774,568,990	0.4%	Rank history: #32 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
34	HP Enterprise Services LLC 23 awardees, including Peraton Enterprise Solutions LLC, Peraton Inc. and Peraton Technology Services Inc. Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$697,267,240	0.4%	Rank history: #13 in FY2022, #11 in FY2023, #52 in FY2024 and not on the FY2025 list; up 86 since FY2020.
35	Guidehouse Inc. 2 awardees Top agencies SBA (Small Business Administration) HHS (Department of Health and Human Services) DOS (Department of State)	$690,773,861	0.3%	Rank history: #43 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
36	Brookhaven Science Associates LLC Top agencies DOE (Department of Energy)	$667,585,945	0.3%	Rank history: #30 in FY2022, #40 in FY2023, #39 in FY2024 and #38 in FY2025; up 2 since FY2020.
37	Sierra Nevada Company, LLC 5 awardees, including Kutta Technologies, LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) OSD (Office of the Secretary of Defense)	$662,746,036	0.3%	Rank history: #47 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
38	Tetra Tech, Inc. 54 awardees, including Ard, Inc., Management Systems International, Inc. and Advanced Management Technology, Inc. Top agencies USAID (US Agency for International Development) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$629,720,723	0.3%	Rank history: #44 in FY2022, #38 in FY2023, #37 in FY2024 and #51 in FY2025; up 12 since FY2020.
39	Georgia TECH Research Corp 2 awardees, including Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$616,964,222	0.3%	Rank history: #42 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
40	ICF International, Inc. 6 awardees, including ICF Incorporated, L.L.C., Incentive Technology Group LLC and ICF Macro Inc. Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) EPA (Environmental Protection Agency)	$610,596,227	0.3%	Rank history: #46 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
41	Four Points Technology, L.L.C. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$610,294,666	0.3%	Rank history: #52 in FY2022, #47 in FY2023, #36 in FY2024 and #39 in FY2025; up 15 since FY2020.
42	Fcn, Inc. Top agencies Treasury (Department of the Treasury) DHS (Department of Homeland Security) Navy (Department of the Navy)	$596,697,624	0.3%	Rank history: #41 in FY2022, #32 in FY2023, #33 in FY2024 and #34 in FY2025; up 2 since FY2020.
43	Amentum Services, Inc. 4 awardees, including Dyncorp International LLC and URS Federal Services International, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$595,475,450	0.3%	Rank history: #48 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; up 107 since FY2020.
44	Alliance for Energy Innovation, LLC Top agencies DOE (Department of Energy) USAID (US Agency for International Development) Navy (Department of the Navy)	$587,241,583	0.3%	Rank history: #38 in FY2022, #24 in FY2023, #26 in FY2024 and #35 in FY2025; up 39 since FY2020.
45	AECOM 45 awardees, including JT4 LLC, AECOM Technical Services, Inc. and Aecom-Baker-Cardno Navfac Atlantic Planning JV Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$566,248,220	0.3%	Rank history: #39 in FY2022, #33 in FY2023, #68 in FY2024 and not on the FY2025 list; down 23 since FY2020.
46	Arctic Slope Regional Corporation 17 awardees, including Arctic Slope Technical Services, Inc., Asrc Federal System Solutions LLC and Netcentric Technology, LLC Top agencies NASA (National Aeronautics and Space Administration) DOT (Department of Transportation) USAF (Department of the Air Force)	$557,645,015	0.3%	Rank history: #50 in FY2022, #54 in FY2023, #56 in FY2024 and #28 in FY2025; up 11 since FY2020.
47	Thundercat Technology, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) HHS (Department of Health and Human Services)	$543,721,549	0.3%	Rank history: #45 in FY2022, #41 in FY2023, #40 in FY2024 and #36 in FY2025; unchanged since FY2020.
48	PAE Government Services Inc. 10 awardees, including Macfadden & Associates, Inc., PAE National Security Solutions LLC and PAE Professional Services, LLC Top agencies DOS (Department of State) USAID (US Agency for International Development) DHS (Department of Homeland Security)	$539,250,830	0.3%	Rank history: #55 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; up 33 since FY2020.
49	Omnicom Group Inc. 8 awardees, including DDB Chicago Inc., Gsd&M LLC and Porter Novelli Public Services Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$505,132,966	0.3%	Rank history: #51 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
50	On Assignment, Inc. 7 awardees, including ECS Federal, LLC, Indrasoft Inc. and Inforeliance LLC Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security) DISA (Defense Information Systems Agency)	$494,701,995	0.2%	Rank history: #63 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
51	Aerojet Rocketdyne Holdings, Inc. 5 awardees, including Aerojet Rocketdyne of DE, Inc. and Aerojet Rocketdyne, Inc. Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$485,941,063	0.2%	Rank history: #73 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
52	Torch Technologies Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$470,904,254	0.2%	Rank history: #49 in FY2022, #49 in FY2023, #47 in FY2024 and #46 in FY2025; down 7 since FY2020.
53	Space Exploration Technologies Corp. Top agencies NASA (National Aeronautics and Space Administration) OSD (Office of the Secretary of Defense) SDA (Space Development Agency)	$442,350,468	0.2%	Rank history: #33 in FY2022, #35 in FY2023, #46 in FY2024 and #90 in FY2025; up 196 since FY2020.
54	ABT Global LLC 2 awardees Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) HUD (Department of Housing and Urban Development)	$439,641,322	0.2%	Rank history: #64 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
55	The Interpublic Group of Companies Inc 7 awardees, including IPG Dxtra, Inc., True North Communications Inc. and Mullenlowe US Inc. Top agencies HHS (Department of Health and Human Services) DHRA (Defense Human Resources Activity) DOS (Department of State)	$438,162,888	0.2%	Rank history: #66 in FY2022, #71 in FY2023, #86 in FY2024 and not on the FY2025 list; up 90 since FY2020.
56	Research Triangle Institute 2 awardees, including International Resources Group Ltd. Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) ED (Department of Education)	$432,690,396	0.2%	Rank history: #59 in FY2022, #58 in FY2023, #49 in FY2024 and #82 in FY2025; up 4 since FY2020.
57	Microsoft Corporation 2 awardees, including Github Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$420,846,827	0.2%	Rank history: #56 in FY2022, #60 in FY2023, #61 in FY2024 and #73 in FY2025; down 8 since FY2020.
58	PPD Development L.P. Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$419,268,663	0.2%	Rank history: not on the FY2022–FY2025 lists; up 209 since FY2020.
59	Colossal Contracting LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DISA (Defense Information Systems Agency)	$411,679,978	0.2%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 75 since FY2020.
60	Emergent Biosolutions Inc. 3 awardees, including Emergent Product Development Gaithersburg Inc. and Emergent Virology, LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$409,176,219	0.2%	Rank history: not on the FY2022–FY2025 lists; up 32 since FY2020.
61	Kpmg L.L.P. 2 awardees Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) HHS (Department of Health and Human Services)	$406,936,665	0.2%	Rank history: #60 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; up 35 since FY2020.
62	Ernst & Young LLP 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$382,764,255	0.2%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
63	Minburn Technology Group, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DHA (Defense Health Agency)	$381,286,990	0.2%	Rank history: #76 in FY2022, #51 in FY2023, #43 in FY2024 and #48 in FY2025; up 19 since FY2020.
64	Nippon Telegraph and Telephone Corporation 2 awardees, including NTT Data Federal Services, Inc. and NTT Data Services Federal Government, LLC Top agencies DOJ (Department of Justice) USAID (US Agency for International Development) HHS (Department of Health and Human Services)	$374,049,139	0.2%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; up 35 since FY2020.
65	Deployed Resources LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$371,885,670	0.2%	Rank history: #37 in FY2022, #30 in FY2023, #20 in FY2024 and #63 in FY2025; up 42 since FY2020.
66	New TECH Solutions, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$362,351,474	0.2%	Rank history: #68 in FY2022, #68 in FY2023, #63 in FY2024 and #55 in FY2025; up 21 since FY2020.
67	General Atomic Technologies Corporation 5 awardees, including General Atomics Aeronautical Systems, Inc. and General Atomics Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOE (Department of Energy)	$342,567,281	0.2%	Rank history: #92 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; up 31 since FY2020.
68	Highlight Technologies, LLC Top agencies SBA (Small Business Administration) USAID (US Agency for International Development) DHS (Department of Homeland Security)	$340,987,415	0.2%	Rank history: not on the FY2022–FY2025 lists; up 57 since FY2020.
69	DCS Corporation 3 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$337,078,143	0.2%	Rank history: #81 in FY2022, #79 in FY2023, #79 in FY2024 and #71 in FY2025; down 2 since FY2020.
70	Smartronix LLC 3 awardees, including Datastrong, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) VA (Department of Veterans Affairs)	$332,550,210	0.2%	Rank history: #62 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
71	Logistics Management Institute 2 awardees, including The Tauri Group, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) OSD (Office of the Secretary of Defense)	$328,477,821	0.2%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
72	Oak Ridge Associated Universities, Incorporated Top agencies DOE (Department of Energy) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$326,166,942	0.2%	Rank history: #65 in FY2022, #70 in FY2023, #65 in FY2024 and #93 in FY2025; down 2 since FY2020.
73	America's Blood Centers Top agencies HHS (Department of Health and Human Services)	$325,195,248	0.2%	Rank history: not on the FY2022–FY2025 lists; up 55 since FY2020.
74	BAE Systems Land & Armaments L.P. 15 awardees, including BAE Systems Technology Solutions & Services Inc. and BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$320,975,674	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Advanced Technology Systems Inc. 7 awardees, including Salient Crgt, Inc., Salient Federal-Sgis Inc. and Guident Technologies, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) Navy (Department of the Navy)	$310,438,110	0.2%	Rank history: not on the FY2022 list, #59 in FY2023, #94 in FY2024 and not on the FY2025 list; up 29 since FY2020.
76	Westat, Inc. Top agencies HHS (Department of Health and Human Services) ED (Department of Education) NSF (National Science Foundation)	$309,927,540	0.2%	Rank history: #78 in FY2022, not on the FY2023 list, #75 in FY2024 and not on the FY2025 list; up 12 since FY2020.
77	Oasis Systems, LLC 2 awardees Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) Navy (Department of the Navy)	$302,311,538	0.2%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 25 since FY2020.
78	Huntington Ingalls Industries, Inc. 8 awardees, including HII Mission Technologies Corp, HII Fleet Support Group LLC and Fulcrum It Services, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$300,087,302	0.2%	Rank history: #28 in FY2022, #43 in FY2023, #15 in FY2024 and #17 in FY2025; down 2 since FY2020.
79	Applied Research Associates, Inc. 3 awardees, including Neya Systems LLC Top agencies DTRA (Defense Threat Reduction Agency) Army (Department of the Army) USAF (Department of the Air Force)	$298,289,160	0.1%	Rank history: #69 in FY2022, #56 in FY2023, #62 in FY2024 and #64 in FY2025; up 16 since FY2020.
80	Mythics, LLC 2 awardees, including Emergent, LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) VA (Department of Veterans Affairs)	$295,099,333	0.1%	Rank history: #82 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
81	ACE Info Solutions LLC 2 awardees, including Guidehouse Digital LLC and Dovel Technologies LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) DHS (Department of Homeland Security)	$292,504,634	0.1%	Rank history: not on the FY2022–FY2025 lists; up 85 since FY2020.
82	Colsa Corp Top agencies USAF (Department of the Air Force) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$290,497,104	0.1%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
83	Koniag, Inc. 10 awardees, including Tuknik Government Services LLC, Eagle Harbor Solutions LLC and Arlluk Technology Solutions LLC Top agencies DOS (Department of State) USDA (Department of Agriculture) DISA (Defense Information Systems Agency)	$289,343,786	0.1%	Rank history: #70 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; up 53 since FY2020.
84	Tista Science and Technology Corporation Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$286,505,559	0.1%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 38 since FY2020.
85	Range Generation Next LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$286,174,215	0.1%	Rank history: not on the FY2022 list, #100 in FY2023 and not on the FY2024–FY2025 lists; up 32 since FY2020.
86	V3Gate, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USAF (Department of the Air Force)	$283,957,930	0.1%	Rank history: #67 in FY2022, #53 in FY2023, #48 in FY2024 and #43 in FY2025; down 33 since FY2020.
87	World Wide Technology Holding Co. Inc. 2 awardees, including World Wide Technology LLC and Asynchrony Solutions, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DOJ (Department of Justice)	$279,255,403	0.1%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; up 42 since FY2020.
88	DAI Global LLC 2 awardees Top agencies USAID (US Agency for International Development)	$279,138,661	0.1%	Rank history: #72 in FY2022, #67 in FY2023, #60 in FY2024 and not on the FY2025 list; down 13 since FY2020.
89	Linquest Corporation 3 awardees, including The Perduco Group, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$278,829,824	0.1%	Rank history: #100 in FY2022, #89 in FY2023, #85 in FY2024 and #70 in FY2025; up 12 since FY2020.
90	Mantech Tsg-2 Joint Venture Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense) USAF (Department of the Air Force)	$277,256,789	0.1%	Rank history: not on the FY2022–FY2023 lists, #59 in FY2024 and #68 in FY2025; up 3 since FY2020.
91	Riverside Research Institute 2 awardees, including Applied Research Solutions, Inc. Top agencies USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service) OSD (Office of the Secretary of Defense)	$266,800,604	0.1%	Rank history: #94 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
92	Cherokee Nation 11 awardees, including Cherokee Nation Strategic Programs, L.L.C., Cherokee Federal Solutions, L.L.C. and Cherokee Nation Management & Consulting, L.l.c.. Top agencies DOS (Department of State) USAF (Department of the Air Force) Army (Department of the Army)	$266,638,068	0.1%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
93	Credence Management Solutions Limited Liability Company Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$265,818,374	0.1%	Rank history: #89 in FY2022, #88 in FY2023, #53 in FY2024 and #81 in FY2025; down 8 since FY2020.
94	Maximus Inc. 9 awardees, including Maximus Federal Services, Inc., Maximus Federal Technology Solutions, LLC and Q2 Administrators, LLC Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury) Commerce (Department of Commerce)	$264,507,765	0.1%	Rank history: #83 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; up 93 since FY2020.
95	General Electric Company 13 awardees, including GE Energy Power Conversion USA Inc., GE Energy Power Conversion Naval Systems Inc. and Johnson Technology Systems Inc. Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$258,435,735	0.1%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
96	Govcio, LLC Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) DOL (Department of Labor)	$257,037,454	0.1%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; up 65 since FY2020.
97	Blue Origin Federation, LLC Top agencies NASA (National Aeronautics and Space Administration)	$252,615,202	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
98	The Rand Corporation Top agencies OSD (Office of the Secretary of Defense) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$252,295,367	0.1%	Rank history: #98 in FY2022, #99 in FY2023, #97 in FY2024 and not on the FY2025 list; up 34 since FY2020.
99	Noblis, Inc. 3 awardees, including Noblis MSD LLC Top agencies DOT (Department of Transportation) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$250,333,627	0.1%	Rank history: #71 in FY2022, #74 in FY2023, #77 in FY2024 and #86 in FY2025; up 20 since FY2020.
100	Scientific Research Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$249,429,814	0.1%	Rank history: not on the FY2022 list, #92 in FY2023, #72 in FY2024 and #60 in FY2025; down 11 since FY2020.

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100 of 21,478 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 541

Code	Net obligations	Largest contractor
5415 Computer Systems Design and Related Services	$61,041,371,219	Leidos Holdings, Inc.
5417 Scientific Research and Development Services	$50,495,810,416	Lockheed Martin Corporation
5413 Architectural, Engineering, and Related Services	$42,180,376,680	General Dynamics Corporation
5416 Management, Scientific, and Technical Consulting Services	$19,451,026,693	Chemonics International, Inc.
5419 Other Professional, Scientific, and Technical Services	$11,577,316,629	Battelle Memorial Institute
5412 Accounting, Tax Preparation, Bookkeeping, and Payroll Services	$1,727,065,471	Kpmg L.L.P.
5418 Advertising, Public Relations, and Related Services	$1,585,617,987	Omnicom Group Inc.
5411 Legal Services	$724,980,109	Vera Institute of Justice, Inc.
5414 Specialized Design Services	$90,103,951	General Motors Company

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 $199 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 541 contractors in FY2021?

1. General Dynamics Corporation ($7.1B), 2. Lockheed Martin Corporation ($6.65B), 3. Booz Allen Hamilton Holding Corporation ($5.73B), 4. Leidos Holdings, Inc. ($5.73B), 5. Northrop Grumman Corporation ($4.77B), 6. RTX Corporation ($4.62B), 7. Science Applications International Corporation ($3.52B), 8. Fluor Corporation ($3.07B), 9. CACI International Inc. ($2.76B), 10. Deloitte LLP ($2.69B).

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