Top 100 Contractors in NAICS 334517: Irradiation Apparatus Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 334517: Irradiation Apparatus Manufacturing, FY2021
Creator: GovTribe

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

The top 10 won 92% of FY2021 NAICS 334517 contract dollars

Contract obligations: $1,015,034,387 Net of deobligations, by contracts coded NAICS 334517
Contractors: 120 Parent companies with an obligation
Largest contractor: OSI Systems Inc. $214 million, 20.3% 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	OSI Systems Inc. 2 awardees, including Rapiscan Systems Inc. and American Science & Engineering Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Treasury (Department of the Treasury)	$213,569,485	20.3%	Rank history: #8 in FY2022, #6 in FY2023, #20 in FY2024 and not on the FY2025 list; up 7 since FY2020.
2	Siemens Aktiengesellschaft 5 awardees, including Siemens Medical Solutions Usa, Inc., Varian Medical Systems, Inc. and Siemens Industry Inc. Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency)	$176,476,031	16.7%	Rank history: #1 in FY2022, #1 in FY2023, #7 in FY2024 and not on the FY2025 list; unchanged since FY2020.
3	Leidos Holdings, Inc. 5 awardees, including Leidos, Inc., Leidos Security Detection & Automation, Inc. and Reveal Imaging Technologies, Inc. Top agencies DHS (Department of Homeland Security)	$172,261,610	16.3%	Rank history: #9 in FY2022, #4 in FY2023, not on the FY2024 list and #6 in FY2025; up 7 since FY2020.
4	General Electric Company 4 awardees, including OEC Medical Systems, Inc. and GE Healthcare Inc. Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency) DOJ (Department of Justice)	$163,748,549	15.5%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; down 3 since FY2020.
5	Koninklijke Philips N.V. 5 awardees, including Philips North America LLC, Volcano Corporation and Philips Healthcare Informatics Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Army (Department of the Army)	$87,216,880	8.3%	Rank history: #3 in FY2022, #3 in FY2023, #5 in FY2024 and #46 in FY2025; down 1 since FY2020.
6	Astrophysics Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$61,265,296	5.8%	Rank history: #65 in FY2022, #19 in FY2023, #12 in FY2024 and #8 in FY2025; up 88 since FY2020.
7	Smiths Group PLC 2 awardees, including Smiths Detection, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$52,312,634	5.0%	Rank history: #4 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
8	Westinghouse Electric Company LLC Through Westinghouse Government Services LLC Top agencies DOE (Department of Energy)	$16,846,555	1.6%	Rank history: #6 in FY2022, #9 in FY2023, #13 in FY2024 and not on the FY2025 list; up 3 since FY2020.
9	Hologic, Inc. 2 awardees, including Hologic Sales and Service, LLC Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$15,196,265	1.4%	Rank history: #5 in FY2022, #8 in FY2023, #24 in FY2024 and #91 in FY2025; unchanged since FY2020.
10	Varian Medical Systems, Inc. 3 awardees Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$10,493,613	1.0%	Rank history: #55 in FY2022, #36 in FY2023, #25 in FY2024 and #27 in FY2025; up 2 since FY2020.
11	Viken Detection Corporation Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) DOJ (Department of Justice)	$7,827,472	0.7%	Rank history: #71 in FY2022, #67 in FY2023, #67 in FY2024 and #21 in FY2025; up 2 since FY2020.
12	Analogic Corporation 2 awardees, including BK Medical Holding Company, Inc. Top agencies VA (Department of Veterans Affairs)	$3,198,103	0.3%	Rank history: #10 in FY2022, #14 in FY2023, #16 in FY2024 and not on the FY2025 list; up 8 since FY2020.
13	Philips North America LLC Top agencies VA (Department of Veterans Affairs)	$2,918,143	0.3%	Rank history: #11 in FY2022, not on the FY2023 list, #4 in FY2024 and #3 in FY2025; new, not ranked in FY2020.
14	Hopewell Designs, Inc. Top agencies Navy (Department of the Navy)	$2,157,807	0.2%	Rank history: #15 in FY2022, #30 in FY2023, #23 in FY2024 and #28 in FY2025; up 15 since FY2020.
15	Siemens Medical Solutions Usa, Inc. Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency)	$2,029,716	0.2%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
16	J.L Shepherd and Associates, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$1,874,631	0.2%	Rank history: #17 in FY2022, #25 in FY2023, #76 in FY2024 and #35 in FY2025; up 8 since FY2020.
17	Hitachi, Ltd. Through Fujifilm Healthcare Americas Corp Top agencies VA (Department of Veterans Affairs)	$1,589,531	0.2%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
18	BNC Corp. Top agencies DTRA (Defense Threat Reduction Agency) Navy (Department of the Navy)	$1,540,056	0.1%	Rank history: #25 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
19	Spectrum Dynamics Medical Inc Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency)	$1,531,933	0.1%	Rank history: #13 in FY2022, #63 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
20	Riverain Technologies, Inc. Top agencies VA (Department of Veterans Affairs)	$1,472,183	0.1%	Rank history: #78 in FY2022, #13 in FY2023, #28 in FY2024 and #22 in FY2025; up 7 since FY2020.
21	Atlantium Technologies Ltd Top agencies DOI (Department of the Interior)	$1,467,052	0.1%	Rank history: not on the FY2022–FY2024 lists and #61 in FY2025; new, not ranked in FY2020.
22	Shimadzu Corporation Through Shimadzu Precision Instruments, Inc. Top agencies VA (Department of Veterans Affairs)	$1,429,481	0.1%	Rank history: #38 in FY2022, #20 in FY2023, #44 in FY2024 and not on the FY2025 list; up 8 since FY2020.
23	L3Harris Technologies, Inc. 3 awardees, including Fisica Applied Technologies, Inc. Top agencies Army (Department of the Army)	$1,222,209	0.1%	Rank history: #31 in FY2022, #24 in FY2023, #17 in FY2024 and #24 in FY2025; down 16 since FY2020.
24	V.j. Technologies, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$1,203,461	0.1%	Rank history: #16 in FY2022, #16 in FY2023, #29 in FY2024 and #15 in FY2025; down 8 since FY2020.
25	Precision X-Ray, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$1,011,626	0.1%	Rank history: #45 in FY2022, not on the FY2023–FY2024 lists and #63 in FY2025; new, not ranked in FY2020.
26	Leidos Inc. Top agencies DHS (Department of Homeland Security)	$775,000	0.1%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
27	Avonix Imaging, Inc. Top agencies Commerce (Department of Commerce)	$759,500	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Fuji Photo Film Company Limited (0000) Through Fujifilm Healthcare Americas Corp Top agencies VA (Department of Veterans Affairs)	$722,310	0.1%	Rank history: #18 in FY2022, #21 in FY2023, #70 in FY2024 and not on the FY2025 list; up 12 since FY2020.
29	Nikon Corporation Through Nikon Metrology, LLC Top agencies Navy (Department of the Navy)	$651,408	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	EOS Imaging Inc. Top agencies Army (Department of the Army)	$625,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	Brainlab AG Top agencies VA (Department of Veterans Affairs)	$572,736	0.1%	Rank history: #19 in FY2022, #43 in FY2023, #34 in FY2024 and #25 in FY2025; up 47 since FY2020.
32	1ST American Medical Distributors, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$528,299	0.1%	Rank history: #34 in FY2022, #78 in FY2023, not on the FY2024 list and #76 in FY2025; up 48 since FY2020.
33	Sirtex Medical Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$440,465	<0.1%	Rank history: #56 in FY2022, #40 in FY2023, #39 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
34	Clinical Imaging Systems, Inc. Top agencies VA (Department of Veterans Affairs)	$384,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Rad Source Technologies, Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) DHA (Defense Health Agency)	$372,904	<0.1%	Rank history: #96 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 53 since FY2020.
36	Trillamed LLC Top agencies VA (Department of Veterans Affairs)	$342,706	<0.1%	Rank history: #32 in FY2022, #32 in FY2023, #73 in FY2024 and #44 in FY2025; up 48 since FY2020.
37	Onex Corporation Through Carestream Health, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$335,547	<0.1%	Rank history: not on the FY2022 list, #68 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
38	Raysearch Americas Inc. Top agencies VA (Department of Veterans Affairs)	$313,974	<0.1%	Rank history: #36 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
39	Varex Imaging Corp Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$306,114	<0.1%	Rank history: #40 in FY2022, #31 in FY2023, #37 in FY2024 and #42 in FY2025; up 51 since FY2020.
40	Accuray Incorporated Top agencies VA (Department of Veterans Affairs)	$294,750	<0.1%	Rank history: #37 in FY2022, #33 in FY2023, #38 in FY2024 and #17 in FY2025; down 25 since FY2020.
41	CNMC Co. Inc. Top agencies VA (Department of Veterans Affairs)	$242,964	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
42	Specialised Imaging Incorporated Top agencies Army (Department of the Army)	$234,736	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Kodex, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$221,205	<0.1%	Rank history: #53 in FY2022, #98 in FY2023, not on the FY2024 list and #37 in FY2025; up 20 since FY2020.
44	Agfa Healthcare Corporation 2 awardees, including Agfa US Corp Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DHS (Department of Homeland Security)	$220,923	<0.1%	Rank history: #35 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
45	Veterans Healthcare Supply Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$219,320	<0.1%	Rank history: not on the FY2022 list, #96 in FY2023, #83 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
46	DGA Medical LLC Top agencies VA (Department of Veterans Affairs)	$214,423	<0.1%	Rank history: #39 in FY2022, not on the FY2023 list, #48 in FY2024 and #75 in FY2025; up 1 since FY2020.
47	Best Medical International Inc. Through Huestis Machine Corp Top agencies USAF (Department of the Air Force)	$200,338	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	Lotususa, Inc. Top agencies Army (Department of the Army)	$197,942	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	MXR Imaging, Inc. Top agencies DOJ (Department of Justice)	$192,485	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Comp-Ray, Inc. Top agencies HHS (Department of Health and Human Services)	$190,065	<0.1%	Rank history: not on the FY2022–FY2023 lists, #90 in FY2024 and not on the FY2025 list; up 37 since FY2020.
51	Newco Inc. Top agencies Commerce (Department of Commerce) NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$174,719	<0.1%	Rank history: not on the FY2022 list, #53 in FY2023 and not on the FY2024–FY2025 lists; up 68 since FY2020.
52	Marietta Nondestructive Testing LLC Top agencies Army (Department of the Army)	$169,500	<0.1%	Rank history: not on the FY2022 list, #29 in FY2023, not on the FY2024 list and #13 in FY2025; new, not ranked in FY2020.
53	MD TECH Center LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$148,380	<0.1%	Rank history: #83 in FY2022, not on the FY2023–FY2024 lists and #51 in FY2025; up 3 since FY2020.
54	Illinois Tool Works Inc. 2 awardees, including North Star Imaging Incorporated and QSA Global Inc. Top agencies Navy (Department of the Navy) DOJ (Department of Justice) Army (Department of the Army)	$148,203	<0.1%	Rank history: #24 in FY2022, #11 in FY2023, #22 in FY2024 and #18 in FY2025; down 26 since FY2020.
55	Aecis, LLC Top agencies USAF (Department of the Air Force)	$147,310	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Danaher Corporation Through Devicor Medical Products, Inc. Top agencies VA (Department of Veterans Affairs)	$146,492	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Tattersall Supply, LLC Top agencies USAF (Department of the Air Force)	$140,400	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Boston Scientific Corp Through Biocompatibles, Inc. Top agencies VA (Department of Veterans Affairs)	$138,100	<0.1%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
59	American Science & Engineering Inc. Top agencies DHS (Department of Homeland Security)	$126,000	<0.1%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; down 26 since FY2020.
60	GE Healthcare Iits USA Corp. Top agencies VA (Department of Veterans Affairs)	$125,055	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Four Points Technology, L.L.C. Top agencies VA (Department of Veterans Affairs)	$108,459	<0.1%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
62	Pronova Solutions LLC Top agencies NASA (National Aeronautics and Space Administration)	$106,125	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Linev Systems US Inc. Top agencies DOS (Department of State)	$96,880	<0.1%	Rank history: #60 in FY2022, not on the FY2023–FY2024 lists and #34 in FY2025; new, not ranked in FY2020.
64	Proton S.a. Top agencies USAF (Department of the Air Force) DOS (Department of State)	$96,013	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 62 since FY2020.
65	Rhyfel, Inc. Top agencies VA (Department of Veterans Affairs)	$92,820	<0.1%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
66	B2H Consulting Group LLC Top agencies VA (Department of Veterans Affairs)	$91,142	<0.1%	Rank history: not on the FY2022 list, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
67	Afognak Native Corporation Through Alutiiq Solutions, LLC Top agencies DOS (Department of State)	$88,994	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 50 since FY2020.
68	Cardinal Health, Inc. Through Cardinal Health 414, LLC Top agencies VA (Department of Veterans Affairs)	$85,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	ASE Direct, Inc. Top agencies VA (Department of Veterans Affairs)	$80,081	<0.1%	Rank history: #49 in FY2022, not on the FY2023 list, #61 in FY2024 and #83 in FY2025; new, not ranked in FY2020.
70	Alpha Spectra, Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$78,744	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Point Security Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DOT (Department of Transportation)	$75,155	<0.1%	Rank history: not on the FY2022 list, #55 in FY2023, #31 in FY2024 and #58 in FY2025; down 20 since FY2020.
72	Samyak Solutions, Inc. Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$68,272	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Glis Gesellschaft FUR Luftfahrt- UND Infrastruktur-Sicherheit MBH Through Glis Gesellschaft FÜR Luftfahrt- UND Infrastruktur-Sicherheit MBH Top agencies USAF (Department of the Air Force)	$65,726	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Odonto Magic - S.R.L. Top agencies DHA (Defense Health Agency)	$59,924	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Bayer Corporation 2 awardees, including Bayer Healthcare LLC Top agencies VA (Department of Veterans Affairs)	$57,696	<0.1%	Rank history: #87 in FY2022, #93 in FY2023, #86 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
76	Agfa US Corp Top agencies DHS (Department of Homeland Security)	$56,077	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 22 since FY2020.
77	The Janz Corp Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$49,721	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Excel Imaging Solutions, LLC Top agencies VA (Department of Veterans Affairs)	$49,350	<0.1%	Rank history: #62 in FY2022, #69 in FY2023, #59 in FY2024 and #64 in FY2025; down 32 since FY2020.
79	Alpha Medical Equipment of N.y., Inc. Top agencies Army (Department of the Army)	$48,913	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Anholt Technologies, Inc. Top agencies VA (Department of Veterans Affairs)	$48,786	<0.1%	Rank history: not on the FY2022 list, #86 in FY2023 and not on the FY2024–FY2025 lists; down 19 since FY2020.
81	Ion Beam Applications SA Through IBA Dosimetry America Inc. Top agencies VA (Department of Veterans Affairs)	$48,730	<0.1%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; up 10 since FY2020.
82	Gamma Products Inc. Top agencies Army (Department of the Army)	$45,625	<0.1%	Rank history: #86 in FY2022, #90 in FY2023, #53 in FY2024 and #69 in FY2025; up 14 since FY2020.
83	Maven Imaging LLC Top agencies DOI (Department of the Interior)	$40,897	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	KUB Technologies Inc. Top agencies USDA (Department of Agriculture)	$40,500	<0.1%	Rank history: #27 in FY2022, #47 in FY2023, #47 in FY2024 and #47 in FY2025; new, not ranked in FY2020.
85	Elekta AB (PUBL) Through Elekta Inc. Top agencies USUHS (DOD Uniformed Services University of the Health Sciences) VA (Department of Veterans Affairs)	$36,895	<0.1%	Rank history: #41 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
86	QB Medical Inc. Top agencies VA (Department of Veterans Affairs)	$35,483	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	North Star Imaging Incorporated Top agencies Army (Department of the Army)	$34,450	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
88	Halo X Ray Technologies Limited Top agencies DHS (Department of Homeland Security)	$33,307	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Spec150, LLC Top agencies NRC (Nuclear Regulatory Commission)	$33,000	<0.1%	Rank history: #80 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
90	Smart Vision Building Materials Trading LLC Top agencies Army (Department of the Army)	$32,458	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Philips Medical Systems North America Inc. Top agencies VA (Department of Veterans Affairs)	$31,330	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Bruker Corporation 2 awardees, including Bruker Nano, Inc. Top agencies Army (Department of the Army)	$30,765	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
93	Becton, Dickinson and Co Through Bard Access Systems, Inc. Top agencies VA (Department of Veterans Affairs)	$30,075	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Greenbrier Government Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$27,502	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Orthoscan Inc. 2 awardees, including Ziehm-Orthoscan Inc. and Ziehm Imaging, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$25,702	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
96	Electronic Risks Consultants, Inc. Top agencies Navy (Department of the Navy)	$24,720	<0.1%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
97	Assured Imaging, LLC Top agencies HHS (Department of Health and Human Services)	$24,520	<0.1%	Rank history: #48 in FY2022, not on the FY2023 list, #78 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
98	Smiths Detection Inc. Top agencies DHS (Department of Homeland Security)	$24,171	<0.1%	Rank history: #82 in FY2022, not on the FY2023 list, #3 in FY2024 and #4 in FY2025; down 59 since FY2020.
99	Ultra Electronics Forensic Technology Inc Through Weed Instrument Company, Inc. Top agencies Army (Department of the Army)	$22,290	<0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
100	Laurus Systems Inc. Top agencies VA (Department of Veterans Affairs)	$21,410	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 120 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $1.05 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 334517 contractors in FY2021?

1. OSI Systems Inc. ($214M), 2. Siemens Aktiengesellschaft ($176M), 3. Leidos Holdings, Inc. ($172M), 4. General Electric Company ($164M), 5. Koninklijke Philips N.V. ($87.2M), 6. Astrophysics Inc. ($61.3M), 7. Smiths Group PLC ($52.3M), 8. Westinghouse Electric Company LLC ($16.8M), 9. Hologic, Inc. ($15.2M), 10. Varian Medical Systems, Inc. ($10.5M).

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