Top 100 Contractors in NAICS 54133: Engineering Services, FY2021

Name: Top 100 Contractors in NAICS 54133: Engineering Services, FY2021
Creator: GovTribe

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

The top 10 won 37% of FY2021 NAICS 54133 contract dollars

Contract obligations: $40,125,947,981 Net of deobligations, by contracts coded NAICS 54133 or a code under it
Contractors: 3,678 Parent companies with an obligation
Largest contractor: General Dynamics Corporation $3.76 billion, 8.8% of obligations
Data as of: Oct 14, 2026

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

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	General Dynamics Corporation 32 awardees, including Electric Boat Corporation, General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$3,759,280,450	8.8%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	RTX Corporation 55 awardees, including Raytheon Company and Rockwell Collins, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$2,735,328,733	6.4%	Rank history: #2 in FY2022, #3 in FY2023, #4 in FY2024 and #3 in FY2025; up 5 since FY2020.
3	Northrop Grumman Corporation 43 awardees, including Northrop Grumman Systems Corporation and Orbital Sciences LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$2,077,240,164	4.9%	Rank history: #3 in FY2022, #4 in FY2023, #5 in FY2024 and #5 in FY2025; down 1 since FY2020.
4	Lockheed Martin Corporation 35 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$1,800,283,713	4.2%	Rank history: #5 in FY2022, #5 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since FY2020.
5	Booz Allen Hamilton Holding Corporation 2 awardees, including Booz Allen Hamilton Inc. and Booz Allen Hamilton Engineering Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$1,510,330,561	3.5%	Rank history: #4 in FY2022, #2 in FY2023, #3 in FY2024 and #4 in FY2025; unchanged since FY2020.
6	L3Harris Technologies, Inc. 34 awardees, including L3Harris Technologies Integrated Systems L.P., L3 Technologies, Inc. and L3Harris Interstate Electronics Corporation Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$979,439,503	2.3%	Rank history: #6 in FY2022, #7 in FY2023, #13 in FY2024 and #13 in FY2025; up 2 since FY2020.
7	Science Applications International Corporation 9 awardees, including Engility Services, LLC and Engility LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DOT (Department of Transportation)	$873,072,761	2.0%	Rank history: #7 in FY2022, #8 in FY2023, #7 in FY2024 and #8 in FY2025; down 1 since FY2020.
8	CACI International Inc. 9 awardees, including Caci, Inc. - Federal, Caci Nss, LLC and Caci Technologies, LLC Top agencies Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency) USAF (Department of the Air Force)	$701,549,456	1.6%	Rank history: #11 in FY2022, #9 in FY2023, #9 in FY2024 and #10 in FY2025; up 6 since FY2020.
9	Leidos Holdings, Inc. 17 awardees, including Leidos, Inc., Dynetics, Inc. and Leidos Security Detection & Automation, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$678,950,891	1.6%	Rank history: #12 in FY2022, #12 in FY2023, #11 in FY2024 and #12 in FY2025; up 4 since FY2020.
10	BAE Systems PLC 12 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) Army (Department of the Army)	$639,040,260	1.5%	Rank history: #9 in FY2022, #6 in FY2023, #6 in FY2024 and #6 in FY2025; unchanged since FY2020.
11	The Mitre Corporation 2 awardees Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$555,579,110	1.3%	Rank history: #36 in FY2022, #39 in FY2023, #54 in FY2024 and not on the FY2025 list; unchanged since FY2020.
12	AECOM 35 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)	$506,165,744	1.2%	Rank history: #10 in FY2022, #10 in FY2023, #21 in FY2024 and #71 in FY2025; down 3 since FY2020.
13	The Boeing Company 24 awardees, including Insitu, Inc. and Boeing Aerospace Operations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$487,349,945	1.1%	Rank history: #8 in FY2022, #11 in FY2023, #8 in FY2024 and #11 in FY2025; down 1 since FY2020.
14	Serco North America (Holdings) Inc 7 awardees, including Serco-Ips Corporation, Serco Inc. and Whitney Bradley & Brown, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$418,917,563	1.0%	Rank history: #14 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
15	Jacobs Engineering Group Inc. 35 awardees, including Amentum Technology, Inc., Ch2M Hill, Inc. and Jacobs Government Services Company Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$406,866,421	1.0%	Rank history: #13 in FY2022, #15 in FY2023, #90 in FY2024 and not on the FY2025 list; up 2 since FY2020.
16	Kbr, Inc. 9 awardees, including KBR Wyle Services, LLC, KBR Services, LLC and Kord Technologies, LLC Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$335,298,863	0.8%	Rank history: #18 in FY2022, #18 in FY2023, #100 in FY2024 and not on the FY2025 list; up 3 since FY2020.
17	Mantech International Corporation 6 awardees, including Mantech Advanced Systems International, Inc. and Mantech SRS Technologies, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOS (Department of State)	$327,650,127	0.8%	Rank history: #17 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
18	Amentum Services, Inc. 3 awardees, including Dyncorp International LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$271,097,402	0.6%	Rank history: #20 in FY2022, #20 in FY2023, #12 in FY2024 and not on the FY2025 list; up 36 since FY2020.
19	Alion Science and Technology Corporation 3 awardees, including HII Mission Technologies Corp Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DISA (Defense Information Systems Agency)	$268,280,674	0.6%	Rank history: #29 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
20	Huntington Ingalls Industries, Inc. 5 awardees, including HII Mission Technologies Corp, HII Fleet Support Group LLC and Huntington Ingalls Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$247,637,720	0.6%	Rank history: #16 in FY2022, #14 in FY2023, #10 in FY2024 and #14 in FY2025; up 8 since FY2020.
21	Scientific Research Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$239,207,012	0.6%	Rank history: #26 in FY2022, #22 in FY2023, #24 in FY2024 and #21 in FY2025; down 1 since FY2020.
22	BAE Systems Land & Armaments L.P. 10 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)	$232,918,607	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	HP Enterprise Services LLC 8 awardees, including Peraton Inc., Peraton Technology Services Inc. and Peraton Services & Solutions Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$225,457,915	0.5%	Rank history: #15 in FY2022, #13 in FY2023, #82 in FY2024 and not on the FY2025 list; up 19 since FY2020.
24	Range Generation Next LLC Top agencies USAF (Department of the Air Force)	$222,303,088	0.5%	Rank history: #30 in FY2022, #29 in FY2023, #35 in FY2024 and not on the FY2025 list; up 11 since FY2020.
25	Bechtel Corp Through National Aerospace Solutions, LLC Top agencies USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service)	$221,135,355	0.5%	Rank history: #19 in FY2022, #17 in FY2023, #47 in FY2024 and not on the FY2025 list; up 5 since FY2020.
26	Tetra Tech, Inc. 27 awardees, including Advanced Management Technology, Inc., Bluewater Federal Solutions, Inc. and Pro-Telligent, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAID (US Agency for International Development)	$196,581,478	0.5%	Rank history: #21 in FY2022, #23 in FY2023, #22 in FY2024 and #22 in FY2025; down 5 since FY2020.
27	Credence Management Solutions Limited Liability Company Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$192,775,380	0.5%	Rank history: #27 in FY2022, #26 in FY2023, #18 in FY2024 and #54 in FY2025; down 3 since FY2020.
28	Hdr, Inc. 37 awardees, including HDR Environmental, Operations and Construction, Inc., HDR Engineering, Inc of the Carolinas and Hdr-Gannett Fleming JV Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$192,483,433	0.5%	Rank history: #23 in FY2022, #31 in FY2023, #42 in FY2024 and #39 in FY2025; up 12 since FY2020.
29	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)	$191,008,163	0.4%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
30	Axient LLC 2 awardees, including Systems Engineering Group, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$189,132,697	0.4%	Rank history: #34 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
31	Deloitte LLP 2 awardees, including Deloitte Consulting LLP and Deloitte & Touche LLP Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$173,001,240	0.4%	Rank history: #28 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; up 31 since FY2020.
32	Smartronix LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$172,753,194	0.4%	Rank history: #22 in FY2022, #21 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
33	The Charles Stark Draper Laboratory, Inc. Top agencies Navy (Department of the Navy)	$167,440,562	0.4%	Rank history: #32 in FY2022, #28 in FY2023, #14 in FY2024 and #20 in FY2025; down 10 since FY2020.
34	Torch Technologies Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$165,129,930	0.4%	Rank history: #37 in FY2022, #36 in FY2023, #58 in FY2024 and #64 in FY2025; down 8 since FY2020.
35	Parsons Corporation 7 awardees, including Parsons Government Services Inc., Parsons-Versar Joint Venture and Ndp, LLC Top agencies Army (Department of the Army) DOL (Department of Labor) Navy (Department of the Navy)	$161,678,833	0.4%	Rank history: #38 in FY2022, #24 in FY2023, #27 in FY2024 and #23 in FY2025; up 2 since FY2020.
36	Gryphon Technologies, Inc. 7 awardees, including Gryphon Technologies, L.C., Schafer Government Services, LLC and Gryphon Marine, LLC Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$151,983,914	0.4%	Rank history: #50 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
37	Noblis, Inc. 3 awardees, including Noblis MSD LLC Top agencies DOT (Department of Transportation) Treasury (Department of the Treasury) Navy (Department of the Navy)	$147,722,519	0.3%	Rank history: #24 in FY2022, #19 in FY2023, #30 in FY2024 and #36 in FY2025; up 4 since FY2020.
38	Perspecta Inc. 4 awardees, including Peraton Technology Services Inc., Peraton Services & Solutions Inc. and Peraton Labs Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) Commerce (Department of Commerce)	$146,385,463	0.3%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
39	PAE Government Services Inc. 4 awardees, including PAE National Security Solutions LLC, Centra Technology, Inc. and PAE Professional Services, LLC Top agencies DOS (Department of State) Army (Department of the Army) Commerce (Department of Commerce)	$145,623,205	0.3%	Rank history: #46 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; up 88 since FY2020.
40	DCS Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$145,438,752	0.3%	Rank history: #35 in FY2022, #40 in FY2023, #34 in FY2024 and #31 in FY2025; down 6 since FY2020.
41	Reliance Test & Technology, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$137,164,745	0.3%	Rank history: #31 in FY2022, #33 in FY2023, #33 in FY2024 and #33 in FY2025; down 3 since FY2020.
42	Nova Global Supply and Services LLC 2 awardees, including Valiant Global Defense Services Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$135,313,461	0.3%	Rank history: #40 in FY2022, #32 in FY2023, #75 in FY2024 and not on the FY2025 list; up 41 since FY2020.
43	Georgia TECH Research Corp Through Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$129,518,571	0.3%	Rank history: #51 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
44	Tcom, L.P. Top agencies Army (Department of the Army)	$126,798,177	0.3%	Rank history: #43 in FY2022, #47 in FY2023, #40 in FY2024 and #7 in FY2025; down 12 since FY2020.
45	Apogee Engineering, LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) DHS (Department of Homeland Security)	$123,882,798	0.3%	Rank history: #60 in FY2022, not on the FY2023 list, #80 in FY2024 and #63 in FY2025; up 19 since FY2020.
46	Burns & Mcdonnell, Inc. 3 awardees, including Burns & Mcdonnell Engineering Company, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$118,958,115	0.3%	Rank history: #47 in FY2022, #38 in FY2023, #95 in FY2024 and not on the FY2025 list; up 35 since FY2020.
47	Miracle Systems LLC Top agencies DOS (Department of State) DODEA (Department of Defense Education Activity) DHS (Department of Homeland Security)	$118,506,265	0.3%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
48	LS Technologies LLC Top agencies DOT (Department of Transportation)	$118,248,124	0.3%	Rank history: #41 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
49	Southwest Research Institute Top agencies NASA (National Aeronautics and Space Administration) DOE (Department of Energy) Navy (Department of the Navy)	$116,277,196	0.3%	Rank history: not on the FY2022–FY2025 lists; up 18 since FY2020.
50	General Electric Company 5 awardees, including GE Energy Power Conversion USA Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$116,171,316	0.3%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
51	Honeywell International Inc. 9 awardees, including Honeywell Building Solutions SES Corp and Honeywell Inc. Top agencies GSA (General Services Administration) Army (Department of the Army) USAF (Department of the Air Force)	$115,269,519	0.3%	Rank history: #44 in FY2022, #48 in FY2023, not on the FY2024 list and #44 in FY2025; up 87 since FY2020.
52	Trax International Corporation 2 awardees, including Combined Technical Services, LLC Top agencies Army (Department of the Army)	$113,430,965	0.3%	Rank history: #49 in FY2022, #52 in FY2023, #45 in FY2024 and #37 in FY2025; down 7 since FY2020.
53	Leonardo S.p.A. 10 awardees, including DRS Network & Imaging Systems LLC, DRS Sustainment Systems, Inc. and DRS Advanced ISR LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$107,438,376	0.3%	Rank history: #54 in FY2022, #42 in FY2023, #92 in FY2024 and not on the FY2025 list; down 5 since FY2020.
54	Computer Sciences Corporation Through PAE Applied Technologies LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$97,144,275	0.2%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
55	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies USAID (US Agency for International Development) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$96,913,971	0.2%	Rank history: #55 in FY2022 and not on the FY2023–FY2025 lists; up 22 since FY2020.
56	Arctic Slope Regional Corporation 9 awardees, including Asrc Federal System Solutions LLC, Netcentric Technology, LLC and Arctic Slope Technical Services, Inc. Top agencies DOT (Department of Transportation) USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$96,104,304	0.2%	Rank history: #53 in FY2022, #59 in FY2023, #46 in FY2024 and #29 in FY2025; up 5 since FY2020.
57	Cherokee Nation 6 awardees, including Cherokee Nation Strategic Programs, L.L.C., Cherokee Nation Red Wing, L.L.C. and Cherokee Federal Solutions, L.L.C. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) DHS (Department of Homeland Security)	$94,372,002	0.2%	Rank history: #61 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
58	The Compass PTS JV Top agencies DHS (Department of Homeland Security)	$91,982,343	0.2%	Rank history: not on the FY2022 list, #63 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
59	American Systems Corporation 3 awardees, including DDL Omni Engineering LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) OSD (Office of the Secretary of Defense)	$91,442,334	0.2%	Rank history: #88 in FY2022, #66 in FY2023, #72 in FY2024 and #72 in FY2025; up 1 since FY2020.
60	Precise Systems, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$89,809,662	0.2%	Rank history: #48 in FY2022, #45 in FY2023, #44 in FY2024 and #53 in FY2025; up 9 since FY2020.
61	Core4Ce LLC Through Spinvi Consulting LLC Top agencies Navy (Department of the Navy) DHA (Defense Health Agency)	$89,618,474	0.2%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
62	Nana Regional Corporation Inc 6 awardees, including Rivertech LLC, Lynxnet, LLC and Lockwood Hills Federal LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$87,770,017	0.2%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; up 40 since FY2020.
63	University of Dayton Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$87,685,607	0.2%	Rank history: #67 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
64	VT Milcom Inc. 4 awardees, including Delta Resources, Inc. Top agencies Navy (Department of the Navy)	$85,487,529	0.2%	Rank history: #70 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
65	International Business Machines Corporation 2 awardees Top agencies Navy (Department of the Navy) DMEA (Defense Microelectronics Activity) USAF (Department of the Air Force)	$81,904,732	0.2%	Rank history: #25 in FY2022, #25 in FY2023, #26 in FY2024 and #25 in FY2025; up 61 since FY2020.
66	Ironmountain Solutions, LLC Top agencies Army (Department of the Army)	$80,905,631	0.2%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; up 67 since FY2020.
67	Mndpi Pacific JV Top agencies Navy (Department of the Navy)	$80,008,105	0.2%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; up 299 since FY2020.
68	General Dynamics Information Technology, Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy) DHS (Department of Homeland Security)	$79,119,430	0.2%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; down 39 since FY2020.
69	Starr II, A Joint Venture Top agencies DHS (Department of Homeland Security)	$74,768,966	0.2%	Rank history: not on the FY2022 list, #97 in FY2023 and not on the FY2024–FY2025 lists; up 25 since FY2020.
70	Prism Maritime, Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$73,260,686	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
71	Ameresco Inc. 3 awardees, including Ameresco Federal Solutions, Inc. and Ameresco Select, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$71,217,939	0.2%	Rank history: #45 in FY2022, #54 in FY2023, #73 in FY2024 and #17 in FY2025; up 104 since FY2020.
72	Southwest Range Services LLC Top agencies Army (Department of the Army)	$69,389,723	0.2%	Rank history: #74 in FY2022, #83 in FY2023, #89 in FY2024 and #97 in FY2025; down 6 since FY2020.
73	Amyx Inc. Top agencies DTRA (Defense Threat Reduction Agency) DHA (Defense Health Agency) USTRANSCOM (Department of Defense United States Transportation Command)	$69,213,960	0.2%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
74	Systems Planning and Analysis, Inc. Top agencies Navy (Department of the Navy)	$69,045,419	0.2%	Rank history: #66 in FY2022, #61 in FY2023, #37 in FY2024 and #30 in FY2025; up 5 since FY2020.
75	Avion Solutions Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$66,785,679	0.2%	Rank history: #68 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
76	Bowhead Mission Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$66,327,389	0.2%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
77	Southeastern Computer Consultants Inc. 2 awardees Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$62,700,506	0.1%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 40 since FY2020.
78	Black & Veatch Special Projects Corp. Top agencies Army (Department of the Army) Navy (Department of the Navy) MDA (DOD Missile Defense Agency)	$61,863,420	0.1%	Rank history: not on the FY2022–FY2025 lists; up 128 since FY2020.
79	M.c. Dean, Inc. Top agencies Navy (Department of the Navy) EPA (Environmental Protection Agency) Commerce (Department of Commerce)	$60,428,961	0.1%	Rank history: #52 in FY2022, #58 in FY2023, #56 in FY2024 and #49 in FY2025; up 21 since FY2020.
80	Tech-Marine Business, Inc. Top agencies Navy (Department of the Navy)	$59,652,130	0.1%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; up 30 since FY2020.
81	OST Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$59,594,190	0.1%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
82	Noresco LLC Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) Army (Department of the Army)	$59,478,192	0.1%	Rank history: not on the FY2022–FY2025 lists; up 166 since FY2020.
83	Ukpeagvik Inupiat Corpor Through Bowhead Professional Solutions LLC Top agencies Navy (Department of the Navy)	$59,264,315	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
84	Chugach Technical Solutions LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$58,161,970	0.1%	Rank history: #73 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; up 296 since FY2020.
85	Aaski Technology Inc. 5 awardees, including Mag DS Corp, Ausley Associates, Inc. and UAV Communications, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$57,553,748	0.1%	Rank history: not on the FY2022–FY2025 lists; up 98 since FY2020.
86	Innovative Technology Solutions JV, LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) DHS (Department of Homeland Security)	$56,623,281	0.1%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
87	National Aerospace Solutions, LLC Top agencies USAF (Department of the Air Force)	$56,294,729	0.1%	Rank history: not on the FY2022–FY2023 lists, #31 in FY2024 and not on the FY2025 list; down 44 since FY2020.
88	Koam Engineering Systems, Inc. Top agencies Navy (Department of the Navy)	$55,721,013	0.1%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
89	Noblis MSD LLC 2 awardees, including Noblis, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$55,188,997	0.1%	Rank history: not on the FY2022–FY2023 lists, #50 in FY2024 and #58 in FY2025; down 24 since FY2020.
90	Imagine One Technology & Management Ltd Top agencies Navy (Department of the Navy)	$55,188,171	0.1%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
91	Obxtek Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOS (Department of State)	$54,377,908	0.1%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
92	Sawdey Solution Services Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$54,319,209	0.1%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
93	Cubic Defense Applications, Inc. Top agencies Navy (Department of the Navy)	$54,050,700	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Mclaughlin Research Corporation Top agencies Navy (Department of the Navy)	$53,984,949	0.1%	Rank history: #99 in FY2022, not on the FY2023–FY2024 lists and #94 in FY2025; up 10 since FY2020.
95	Bb&E, Inc. Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$53,248,622	0.1%	Rank history: #92 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
96	Johnson Controls Security Solutions LLC Through Johnson Controls Government Systems, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) GSA (General Services Administration)	$52,944,232	0.1%	Rank history: #59 in FY2022, #72 in FY2023, #69 in FY2024 and not on the FY2025 list; up 84 since FY2020.
97	Fidelity Technologies Corporation Top agencies Navy (Department of the Navy)	$52,196,818	0.1%	Rank history: #58 in FY2022, #56 in FY2023, #41 in FY2024 and #46 in FY2025; up 19 since FY2020.
98	Falconwood Top agencies Navy (Department of the Navy)	$51,679,955	0.1%	Rank history: #94 in FY2022, #85 in FY2023, not on the FY2024 list and #96 in FY2025; down 27 since FY2020.
99	QED Systems, Inc. Top agencies Navy (Department of the Navy)	$51,583,386	0.1%	Rank history: not on the FY2022–FY2025 lists; up 32 since FY2020.
100	On Assignment, Inc. 5 awardees, including ECS Federal, LLC Top agencies Navy (Department of the Navy) Commerce (Department of Commerce) DOJ (Department of Justice)	$51,244,098	0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.

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100 of 3,678 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 54133

Code	Net obligations	Largest contractor
541330 Engineering Services	$40,125,947,981	General Dynamics Corporation

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 $42.8 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 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 54133 contractors in FY2021?

1. General Dynamics Corporation ($3.76B), 2. RTX Corporation ($2.74B), 3. Northrop Grumman Corporation ($2.08B), 4. Lockheed Martin Corporation ($1.8B), 5. Booz Allen Hamilton Holding Corporation ($1.51B), 6. L3Harris Technologies, Inc. ($979M), 7. Science Applications International Corporation ($873M), 8. CACI International Inc. ($702M), 9. Leidos Holdings, Inc. ($679M), 10. BAE Systems PLC ($639M).

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