Top 100 Contractors in NAICS 33451: Navigational, Measuring, Electromedical, and Control Instruments Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 33451: Navigational, Measuring, Electromedical, and Control Instruments Manufacturing, FY2021
Creator: GovTribe

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

The top 10 won 59% of FY2021 NAICS 33451 contract dollars

Contract obligations: $19,053,270,061 Net of deobligations, by contracts coded NAICS 33451 or a code under it
Contractors: 4,522 Parent companies with an obligation
Largest contractor: RTX Corporation $4.14 billion, 20.9% 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	RTX Corporation 59 awardees, including Raytheon Company Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$4,138,894,722	20.9%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Lockheed Martin Corporation 27 awardees Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency) Army (Department of the Army)	$2,922,692,956	14.7%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since FY2020.
3	Northrop Grumman Corporation 34 awardees, including Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$1,889,058,840	9.5%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; up 1 since FY2020.
4	L3Harris Technologies, Inc. 56 awardees, including L3 Technologies, Inc., L3Harris Interstate Electronics Corporation and Wescam Usa, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$611,375,055	3.1%	Rank history: #4 in FY2022, #5 in FY2023, #8 in FY2024 and #5 in FY2025; up 1 since FY2020.
5	Leidos Holdings, Inc. 13 awardees, including Leidos, Inc. and Leidos Security Detection & Automation, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) Army (Department of the Army)	$455,532,841	2.3%	Rank history: #13 in FY2022, #11 in FY2023, #15 in FY2024 and #11 in FY2025; up 3 since FY2020.
6	Tcom, L.P. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$438,543,445	2.2%	Rank history: #5 in FY2022 and not on the FY2023–FY2025 lists; up 148 since FY2020.
7	Leonardo S.p.A. 16 awardees, including Laurel Technologies Partnership, DRS Network & Imaging Systems LLC and DRS Systems, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOT (Department of Transportation)	$346,613,576	1.7%	Rank history: #6 in FY2022, #6 in FY2023, #5 in FY2024 and #6 in FY2025; unchanged since FY2020.
8	Erapsco Top agencies Navy (Department of the Navy)	$290,846,363	1.5%	Rank history: #7 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
9	General Atomic Technologies Corporation 2 awardees, including General Atomics Aeronautical Systems, Inc. and General Atomics Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$286,549,266	1.4%	Rank history: #9 in FY2022, #12 in FY2023, #13 in FY2024 and not on the FY2025 list; up 3 since FY2020.
10	BAE Systems PLC 15 awardees, including BAE Systems Information and Electronic Systems Integration Inc., BAE Systems Technology Solutions & Services Inc. and BAE Systems Land & Armaments L.P. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$274,080,919	1.4%	Rank history: #8 in FY2022, #8 in FY2023, #7 in FY2024 and #7 in FY2025; up 3 since FY2020.
11	Siemens Aktiengesellschaft 12 awardees, including Siemens Medical Solutions Usa, Inc., Siemens Healthcare Diagnostics Inc. and Varian Medical Systems, Inc. Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$245,241,334	1.2%	Rank history: #10 in FY2022, #10 in FY2023, #39 in FY2024 and not on the FY2025 list; up 11 since FY2020.
12	The Boeing Company 19 awardees, including Liquid Robotics, Inc. and Jeppesen Foreflight, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$241,261,697	1.2%	Rank history: #11 in FY2022, #4 in FY2023, #4 in FY2024 and #4 in FY2025; down 6 since FY2020.
13	OSI Systems Inc. 4 awardees, including Rapiscan Systems Inc., American Science & Engineering Inc. and Spacelabs Healthcare LLC Top agencies DHS (Department of Homeland Security) AOUSC (Administrative Office of the U.S. Courts) USAF (Department of the Air Force)	$219,090,636	1.1%	Rank history: #48 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; up 48 since FY2020.
14	Sonova Holding AG 2 awardees, including Sonova USA Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$210,540,488	1.1%	Rank history: #14 in FY2022, #13 in FY2023, #11 in FY2024 and not on the FY2025 list; up 12 since FY2020.
15	The Charles Stark Draper Laboratory, Inc. Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services)	$208,118,072	1.0%	Rank history: #16 in FY2022, #17 in FY2023, #26 in FY2024 and #63 in FY2025; up 2 since FY2020.
16	Danaher Corporation 24 awardees, including Cepheid, Beckman Coulter, Inc. and AB Sciex LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$202,335,589	1.0%	Rank history: #20 in FY2022, #20 in FY2023, #30 in FY2024 and #49 in FY2025; up 7 since FY2020.
17	General Dynamics Corporation 15 awardees, including Electric Boat Corporation, General Dynamics Mission Systems, Inc. and General Dynamics-Ots, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$187,541,647	0.9%	Rank history: #12 in FY2022, #14 in FY2023, #10 in FY2024 and #8 in FY2025; down 7 since FY2020.
18	General Electric Company 11 awardees, including OEC Medical Systems, Inc., Druck, LLC and GE Aviation Systems LLC Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$169,121,030	0.9%	Rank history: #15 in FY2022, #16 in FY2023, #16 in FY2024 and #19 in FY2025; up 1 since FY2020.
19	Koninklijke Philips N.V. 12 awardees, including Philips North America LLC, Philips Healthcare Informatics Inc. and Allparts Medical, LLC Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency) HHS (Department of Health and Human Services)	$168,704,065	0.9%	Rank history: #19 in FY2022, #18 in FY2023, #42 in FY2024 and not on the FY2025 list; up 6 since FY2020.
20	Raytheon Company 3 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$160,172,642	0.8%	Rank history: not on the FY2022–FY2025 lists; up 28 since FY2020.
21	Flir Systems Inc. 8 awardees, including Teledyne Flir Unmanned Ground Systems, Inc., Teledyne Flir Defense, Inc. and Teledyne Flir Commercial Systems Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$149,246,886	0.8%	Rank history: #59 in FY2022, #42 in FY2023, #86 in FY2024 and not on the FY2025 list; down 3 since FY2020.
22	Sierra Nevada Company, LLC 2 awardees Top agencies USSOCOM (United States Special Operations Command) USAF (Department of the Air Force) Navy (Department of the Navy)	$142,601,171	0.7%	Rank history: #32 in FY2022, #19 in FY2023, #19 in FY2024 and #13 in FY2025; down 7 since FY2020.
23	Chemring Group PLC 4 awardees, including Chemring Sensors and Electronic Systems, Inc. and Chemring Energetic Devices Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$135,341,136	0.7%	Rank history: not on the FY2022 list, #77 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
24	Ultra Electronics Forensic Technology Inc 9 awardees, including Ultra Electronics Ocean Systems Inc., Undersea Sensor Systems Inc. and Ultra PCS Limited Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$129,628,560	0.7%	Rank history: #31 in FY2022, #22 in FY2023, #99 in FY2024 and not on the FY2025 list; up 4 since FY2020.
25	Government of Canada 3 awardees, including Canadian Commercial Corporation, National Research Council Canada and National Research Council of Canada Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$124,899,226	0.6%	Rank history: #22 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
26	Smiths Group PLC 3 awardees, including Smiths Detection Inc. and Trak Tecom Corporation Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOJ (Department of Justice)	$112,244,344	0.6%	Rank history: #29 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
27	Honeywell International Inc. 20 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army) DLA (Defense Logistics Agency)	$107,581,943	0.5%	Rank history: #21 in FY2022, #15 in FY2023, #17 in FY2024 and #16 in FY2025; down 11 since FY2020.
28	Analogic Corporation 2 awardees, including BK Medical Holding Company, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$105,232,379	0.5%	Rank history: #33 in FY2022, #66 in FY2023, #65 in FY2024 and not on the FY2025 list; up 181 since FY2020.
29	Thermo Electron Corporation 26 awardees, including Life Technologies Corporation, Thermo Electron North America LLC and Thermo Eberline LLC Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$96,448,521	0.5%	Rank history: #30 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
30	Abbott Laboratories 10 awardees, including Abbott Molecular Inc., Abbott Rapid DX North America LLC and Abbott Rapid Diagnostics Informatics, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$96,044,276	0.5%	Rank history: #34 in FY2022, #25 in FY2023, #36 in FY2024 and #29 in FY2025; up 22 since FY2020.
31	SRC Inc. 2 awardees, including Srctec, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$94,647,938	0.5%	Rank history: #17 in FY2022, #7 in FY2023, #12 in FY2024 and #20 in FY2025; up 14 since FY2020.
32	Sustainable System Solutions LLC Top agencies Army (Department of the Army)	$84,234,669	0.4%	Rank history: #38 in FY2022, #36 in FY2023, #67 in FY2024 and #78 in FY2025; up 53 since FY2020.
33	Textron Inc. 3 awardees, including Textron Systems Corporation, Able Aerospace Services, Inc. and Textron Ground Support Equipment Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$81,047,142	0.4%	Rank history: #43 in FY2022, #27 in FY2023, #57 in FY2024 and #51 in FY2025; up 4 since FY2020.
34	General Dynamics Mission Systems, Inc. Top agencies Navy (Department of the Navy) DOT (Department of Transportation) DLA (Defense Logistics Agency)	$71,280,835	0.4%	Rank history: #25 in FY2022, #31 in FY2023, #22 in FY2024 and not on the FY2025 list; down 2 since FY2020.
35	Starkey Laboratories Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$66,820,910	0.3%	Rank history: #37 in FY2022, #29 in FY2023, #38 in FY2024 and #33 in FY2025; up 35 since FY2020.
36	BAE Systems Land & Armaments L.P. 12 awardees, including BAE Systems Information and Electronic Systems Integration Inc., BAE Systems Technology Solutions & Services Inc. and BAE Systems Controls Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$64,644,890	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	Roche Holding AG 3 awardees, including Roche Diagnostics Corporation, Kapa Biosystems, Inc. and Roche Diabetes Care Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) Army (Department of the Army)	$64,214,141	0.3%	Rank history: #28 in FY2022, #35 in FY2023, #64 in FY2024 and not on the FY2025 list; up 32 since FY2020.
38	Qinetiq Group PLC 2 awardees, including Foster-Miller, Inc. and Optasense Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$61,899,423	0.3%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; up 39 since FY2020.
39	Astrophysics Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) DTRA (Defense Threat Reduction Agency)	$61,858,436	0.3%	Rank history: not on the FY2022–FY2024 lists and #74 in FY2025; new, not ranked in FY2020.
40	Federal Resources Supply Company 4 awardees, including KD Analytical Consulting LLC and Wright Tool Company, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$59,849,310	0.3%	Rank history: #36 in FY2022, #52 in FY2023, #44 in FY2024 and #53 in FY2025; up 13 since FY2020.
41	Rockwell Collins-ESA Vision Systems Limited Liability Compan Through Collins Elbit Vision Systems, LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$59,051,559	0.3%	Rank history: #41 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
42	Government Scientific Source Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$53,406,818	0.3%	Rank history: #42 in FY2022, #30 in FY2023, #43 in FY2024 and #44 in FY2025; up 2 since FY2020.
43	Technical Communities, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOT (Department of Transportation)	$50,635,392	0.3%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 13 since FY2020.
44	Management Services Group, Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$50,176,645	0.3%	Rank history: #24 in FY2022, #38 in FY2023, #33 in FY2024 and #36 in FY2025; down 20 since FY2020.
45	Saab AB 2 awardees, including Saab, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$48,870,247	0.2%	Rank history: #35 in FY2022, not on the FY2023–FY2024 lists and #83 in FY2025; up 5 since FY2020.
46	Ball Corp Through BAE Systems Space & Mission Systems Inc. Top agencies Commerce (Department of Commerce) Navy (Department of the Navy) USAF (Department of the Air Force)	$47,335,196	0.2%	Rank history: #65 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 112 since FY2020.
47	Teledyne Technologies Incorporated 26 awardees, including Teledyne Instruments, Inc., Teledyne Defense Electronics, LLC and Teledyne Flir Defense, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$45,979,947	0.2%	Rank history: #27 in FY2022, #44 in FY2023, #40 in FY2024 and #23 in FY2025; up 33 since FY2020.
48	Thales 6 awardees, including Thales Defense & Security Inc., Thales Usa, Inc. and Thales Avionics, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DOT (Department of Transportation)	$40,361,825	0.2%	Rank history: #71 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 30 since FY2020.
49	GN Store Nord A/S Through GN Hearing Care Corporation Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$39,251,861	0.2%	Rank history: #52 in FY2022, #43 in FY2023, #79 in FY2024 and not on the FY2025 list; up 16 since FY2020.
50	Science Applications International Corporation 5 awardees, including Asrc Federal Facilities Logistics, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) MDA (DOD Missile Defense Agency)	$37,129,127	0.2%	Rank history: #18 in FY2022, #23 in FY2023, #18 in FY2024 and not on the FY2025 list; down 16 since FY2020.
51	Mbio Diagnostics Inc. Top agencies USAF (Department of the Air Force)	$35,089,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
52	Agilent Technologies, Inc. 10 awardees, including Biotek Instruments, Inc., Agilent Technologies Sales & Services GMBH & Co. KG and Keysight Technologies, Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) USDA (Department of Agriculture)	$34,640,930	0.2%	Rank history: #46 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
53	Moog Inc. 6 awardees, including Moog Military Aircraft LLC and Quickset Defense Technologies LLC Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) Army (Department of the Army)	$33,968,024	0.2%	Rank history: #82 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 66 since FY2020.
54	Advanced Technology Systems Company, Inc. (OF Virginia) Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$33,820,937	0.2%	Rank history: #56 in FY2022, #80 in FY2023, #70 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
55	Elbit Systems Ltd 6 awardees, including Elbitamerica, Inc., Elbit Systems of America - Night Vision LLC and Universal Avionics Systems Corp Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$33,466,836	0.2%	Rank history: #66 in FY2022, #91 in FY2023, #27 in FY2024 and not on the FY2025 list; down 20 since FY2020.
56	Olympus America Inc 6 awardees, including Wabtec Inspection Technologies, Inc. Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$32,172,228	0.2%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; up 106 since FY2020.
57	William Demants OG Hustru IDA Emilies (MILLAS) Fond - Kaldet 7 awardees, including Oticon, Inc., Diagnostic Group LLC and E3 Diagnostics, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USAF (Department of the Air Force)	$32,132,101	0.2%	Rank history: #40 in FY2022, #26 in FY2023, #82 in FY2024 and not on the FY2025 list; up 27 since FY2020.
58	Illumina, Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) Navy (Department of the Navy)	$31,518,675	0.2%	Rank history: #54 in FY2022, #49 in FY2023, #72 in FY2024 and #68 in FY2025; down 3 since FY2020.
59	Idemia Identity & Security USA LLC Top agencies DHS (Department of Homeland Security)	$28,876,656	0.1%	Rank history: not on the FY2022 list, #47 in FY2023 and not on the FY2024–FY2025 lists; up 284 since FY2020.
60	Luminostics Inc. Top agencies HHS (Department of Health and Human Services)	$28,621,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 83 since FY2020.
61	Compagnie Merieux Alliance 5 awardees, including Biofire Diagnostics LLC, Biomerieux Inc. and Biofire Defense LLC Top agencies VA (Department of Veterans Affairs) DOS (Department of State) Army (Department of the Army)	$27,602,210	0.1%	Rank history: #64 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; down 20 since FY2020.
62	Team Corporation 2 awardees, including PPT Group Corp Top agencies Navy (Department of the Navy)	$27,035,281	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	HII Unmanned Systems, Inc. Top agencies Navy (Department of the Navy) Commerce (Department of Commerce) DLA (Defense Logistics Agency)	$26,881,721	0.1%	Rank history: #79 in FY2022, #74 in FY2023, #46 in FY2024 and not on the FY2025 list; down 3 since FY2020.
64	System High Corporation Top agencies DARPA (Defense Advanced Research Projects Agency) OSD (Office of the Secretary of Defense) USAF (Department of the Air Force)	$26,492,468	0.1%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
65	Sechan Electronics Inc. Top agencies Navy (Department of the Navy)	$25,768,058	0.1%	Rank history: not on the FY2022 list, #62 in FY2023, #83 in FY2024 and #93 in FY2025; up 47 since FY2020.
66	Design West Technologies Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$24,935,777	0.1%	Rank history: #45 in FY2022, #70 in FY2023, #32 in FY2024 and #56 in FY2025; up 101 since FY2020.
67	Qorvo, Inc. Through Qorvo Biotechnologies LLC Top agencies HHS (Department of Health and Human Services)	$24,360,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Quidel Corp Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$24,224,772	0.1%	Rank history: not on the FY2022–FY2025 lists; down 32 since FY2020.
69	Ametek Inc. 22 awardees, including Spectro Scientific, Inc., Gatan, Inc. and Advanced Measurement Technology Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$23,335,218	0.1%	Rank history: #63 in FY2022, #99 in FY2023, not on the FY2024 list and #59 in FY2025; up 67 since FY2020.
70	Transdigm Group Incorporated 22 awardees, including Symetrics Industries, LLC, Aerosonic LLC and Airborne Systems North America of NJ Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$22,704,206	0.1%	Rank history: #70 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
71	SAFRAN 10 awardees, including Safran Defense & Space, Inc., Avox Systems Inc. and Safran Power USA LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$22,022,270	0.1%	Rank history: #47 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
72	Mayflower Communications Company, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$21,848,555	0.1%	Rank history: not on the FY2022 list, #34 in FY2023 and not on the FY2024–FY2025 lists; up 7 since FY2020.
73	Sysmex Corporation Through Sysmex America, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$21,742,460	0.1%	Rank history: #55 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; up 34 since FY2020.
74	Minute Molecular DIA Top agencies HHS (Department of Health and Human Services)	$21,300,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Johnson & Johnson 6 awardees, including Ortho-Clinical Diagnostics, Inc., Depuy Synthes Sales Inc. and Biosense Webster, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$21,170,625	0.1%	Rank history: #60 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; up 62 since FY2020.
76	Agfa Healthcare Corporation 2 awardees, including Agfa US Corp Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$21,041,683	0.1%	Rank history: #83 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
77	Velico Medical, Inc. Top agencies HHS (Department of Health and Human Services)	$19,937,320	0.1%	Rank history: not on the FY2022 list, #40 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
78	Grifols Diagnostic Solutions Inc. 2 awardees, including Gen-Probe Incorporated Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$19,898,464	0.1%	Rank history: not on the FY2022–FY2025 lists; up 149 since FY2020.
79	Becton, Dickinson and Co 7 awardees, including C.r. Bard, Inc., Bard Access Systems, Inc. and Becton Dickinson Del Uruguay S.A. Sucursal Del Peru Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$19,768,557	0.1%	Rank history: not on the FY2022–FY2025 lists; down 48 since FY2020.
80	ANP Technologies Inc. Top agencies HHS (Department of Health and Human Services)	$19,727,817	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Vaisala OYJ 2 awardees, including Vaisala Inc. Top agencies DOT (Department of Transportation) Commerce (Department of Commerce) Navy (Department of the Navy)	$19,533,488	0.1%	Rank history: #50 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; up 42 since FY2020.
82	Hologic, Inc. 3 awardees, including Hologic Sales and Service, LLC Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency) DHA (Defense Health Agency)	$18,555,478	0.1%	Rank history: #53 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
83	Ellume USA LLC Top agencies HHS (Department of Health and Human Services)	$17,970,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 45 since FY2020.
84	Trillamed LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) DHA (Defense Health Agency)	$17,948,276	0.1%	Rank history: #39 in FY2022, #68 in FY2023, #50 in FY2024 and not on the FY2025 list; up 106 since FY2020.
85	Saab, Inc. Top agencies Navy (Department of the Navy)	$17,789,572	0.1%	Rank history: not on the FY2022–FY2025 lists; up 209 since FY2020.
86	Westinghouse Electric Company LLC Through Westinghouse Government Services LLC Top agencies DOE (Department of Energy)	$16,846,555	0.1%	Rank history: #61 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
87	Sivantos Inc. Through WS Audiology Usa, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$16,823,484	0.1%	Rank history: #57 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
88	Mountain Horse LLC 2 awardees Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$16,613,484	0.1%	Rank history: #51 in FY2022, #46 in FY2023, #48 in FY2024 and #88 in FY2025; down 31 since FY2020.
89	Theodor Wille Intertrade GMBH Through Atlantic Diving Supply, Inc. Top agencies Army (Department of the Army) DOS (Department of State) DLA (Defense Logistics Agency)	$16,167,862	0.1%	Rank history: #62 in FY2022, #63 in FY2023 and not on the FY2024–FY2025 lists; up 109 since FY2020.
90	Rohde & Schwarz GMBH & Co. KG Through Rohde & Schwarz Usa, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Commerce (Department of Commerce)	$15,946,346	0.1%	Rank history: #78 in FY2022, #60 in FY2023, #92 in FY2024 and #55 in FY2025; up 82 since FY2020.
91	Kranze Technology Solutions Inc. Top agencies Navy (Department of the Navy)	$15,865,801	0.1%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
92	King Nutronics Corporation Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$15,516,707	0.1%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 95 since FY2020.
93	Star Dynamics Corp Top agencies USAF (Department of the Air Force)	$15,328,232	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Signet Technologies Inc. 2 awardees, including Convergint Technologies LLC Top agencies AOUSC (Administrative Office of the U.S. Courts) DHS (Department of Homeland Security) DHA (Defense Health Agency)	$15,278,364	0.1%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; up 20 since FY2020.
95	Ultra Electronics Ocean Systems Inc. Top agencies Navy (Department of the Navy)	$15,179,733	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Intergraph Corporation 5 awardees, including Hexagon US Federal, Inc., Hexagon Manufacturing Intelligence, LLC and Leica Geosystems Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOI (Department of the Interior)	$15,153,473	0.1%	Rank history: #87 in FY2022, #48 in FY2023 and not on the FY2024–FY2025 lists; up 46 since FY2020.
97	Keysight Technologies, Inc. 3 awardees Top agencies Commerce (Department of Commerce) Navy (Department of the Navy) Army (Department of the Army)	$15,128,006	0.1%	Rank history: #100 in FY2022, #65 in FY2023, #76 in FY2024 and not on the FY2025 list; down 26 since FY2020.
98	Uh-Oh Labs Inc. Top agencies HHS (Department of Health and Human Services)	$14,982,258	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Oticon, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$13,974,322	0.1%	Rank history: not on the FY2022–FY2023 lists, #34 in FY2024 and #28 in FY2025; up 19 since FY2020.
100	Veterans Healthcare Supply Solutions, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$13,932,300	0.1%	Rank history: #74 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; up 40 since FY2020.

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100 of 4,522 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 33451

Code	Net obligations	Largest contractor
334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing	$14,291,531,727	RTX Corporation
334516 Analytical Laboratory Instrument Manufacturing	$1,433,930,329	Danaher Corporation
334517 Irradiation Apparatus Manufacturing	$1,015,034,387	OSI Systems Inc.
334519 Other Measuring and Controlling Device Manufacturing	$902,825,641	Lockheed Martin Corporation
334510 Electromedical and Electrotherapeutic Apparatus Manufacturing	$706,280,897	Sonova Holding AG
334515 Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals	$349,070,623	The Boeing Company
334513 Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables	$252,749,709	Technical Communities, Inc.
334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use	$67,717,306	System High Corporation
334514 Totalizing Fluid Meter and Counting Device Manufacturing	$34,130,191	Innovation Associates, 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 $19.8 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 33451 contractors in FY2021?

1. RTX Corporation ($4.14B), 2. Lockheed Martin Corporation ($2.92B), 3. Northrop Grumman Corporation ($1.89B), 4. L3Harris Technologies, Inc. ($611M), 5. Leidos Holdings, Inc. ($456M), 6. Tcom, L.P. ($439M), 7. Leonardo S.p.A. ($347M), 8. Erapsco ($291M), 9. General Atomic Technologies Corporation ($287M), 10. BAE Systems PLC ($274M).

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