Top 100 Contractors in NAICS 3334: Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing, FY2025

Name: Top 100 Contractors in NAICS 3334: Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing, FY2025
Creator: GovTribe

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

The top 10 won 51% of FY2025 NAICS 3334 contract dollars

Contract obligations: $549,384,959 Net of deobligations, by contracts coded NAICS 3334 or a code under it
Contractors: 1,203 Parent companies with an obligation
Largest contractor: Johnson Controls Navy Systems, LLC $142 million, 24.5% 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	Johnson Controls Navy Systems, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$141,710,088	24.5%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2024; unchanged since FY2024.
2	Simulation Technologies Inc Top agencies Army (Department of the Army)	$49,664,136	8.6%	Rank history: not on the FY2021–FY2024 lists; new.
3	HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$23,213,566	4.0%	Rank history: #58 in FY2021, not on the FY2022–FY2023 lists and #7 in FY2024; up 4 since FY2024.
4	Pioneer Industries, LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$14,187,870	2.4%	Rank history: #37 in FY2021, #19 in FY2022, #68 in FY2023 and #63 in FY2024; up 59 since FY2024.
5	The O.c. Lugo Co Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$13,443,408	2.3%	Rank history: #16 in FY2021, #86 in FY2022, #10 in FY2023 and #10 in FY2024; up 5 since FY2024.
6	Leonardo S.p.A. 5 awardees, including Engineered Coil Company, DRS Naval Power Systems Inc. and DRS Network & Imaging Systems LLC Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$11,723,440	2.0%	Rank history: #7 in FY2021, #10 in FY2022, #30 in FY2023 and #6 in FY2024; unchanged since FY2024.
7	Trident Maritime Systems, Inc. Top agencies Navy (Department of the Navy)	$10,654,946	1.8%	Rank history: not on the FY2021–FY2024 lists; new.
8	FM AF, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$10,505,149	1.8%	Rank history: not on the FY2021–FY2024 lists; new.
9	Mainstream Engineering Corp Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$9,176,343	1.6%	Rank history: not on the FY2021 list, #27 in FY2022, not on the FY2023 list and #5 in FY2024; down 4 since FY2024.
10	On-Point Defense Technologies LLC Top agencies Army (Department of the Army)	$8,682,404	1.5%	Rank history: not on the FY2021–FY2023 lists and #4 in FY2024; down 6 since FY2024.
11	Cepeda Associates, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$7,600,521	1.3%	Rank history: #22 in FY2021, #5 in FY2022, #9 in FY2023 and #8 in FY2024; down 3 since FY2024.
12	Meggitt Aerospace Limited Through Meggitt Defense Systems, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DLA (Defense Logistics Agency)	$7,476,313	1.3%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2024; up 54 since FY2024.
13	Hansome Energy Systems Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$7,170,384	1.2%	Rank history: #34 in FY2021, #11 in FY2022, #4 in FY2023 and #3 in FY2024; down 10 since FY2024.
14	Lone Star Blower, Inc. Top agencies USAF (Department of the Air Force)	$5,654,350	1.0%	Rank history: not on the FY2021–FY2024 lists; new.
15	Snowbird Technologies Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$4,945,013	0.9%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2024; up 13 since FY2024.
16	Filtration Services, Inc. Top agencies DOJ (Department of Justice)	$4,940,099	0.9%	Rank history: #42 in FY2021, #13 in FY2022, #22 in FY2023 and #16 in FY2024; unchanged since FY2024.
17	Allclear Aerospace & Defense, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$4,774,356	0.8%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2024; up 14 since FY2024.
18	TL Services, Inc. Top agencies VA (Department of Veterans Affairs)	$4,532,905	0.8%	Rank history: not on the FY2021–FY2024 lists; new.
19	ECI Defense Group, Inc. 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$4,230,213	0.7%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023 and #34 in FY2024; up 15 since FY2024.
20	Argo Turboserve Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$3,987,172	0.7%	Rank history: #18 in FY2021, #17 in FY2022, #25 in FY2023 and #25 in FY2024; up 5 since FY2024.
21	RBC Aircraft Products Inc Through Sargent Aerospace & Defense, LLC Top agencies Navy (Department of the Navy)	$3,980,323	0.7%	Rank history: not on the FY2021–FY2024 lists; new.
22	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) USAF (Department of the Air Force)	$3,953,505	0.7%	Rank history: #13 in FY2021, #15 in FY2022, #26 in FY2023 and #18 in FY2024; down 4 since FY2024.
23	Howden North America Inc 2 awardees Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$3,779,735	0.7%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2024; down 11 since FY2024.
24	Dynamic Air Engineering, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$3,762,035	0.6%	Rank history: #32 in FY2021, #89 in FY2022, #58 in FY2023 and #41 in FY2024; up 17 since FY2024.
25	Windward Enterprises, LLC Top agencies DLA (Defense Logistics Agency)	$3,714,103	0.6%	Rank history: #12 in FY2021, #12 in FY2022, #17 in FY2023 and #20 in FY2024; down 5 since FY2024.
26	L3Harris Technologies, Inc. 4 awardees, including L3Harris Maritime Power & Energy Solutions, Inc., L3 Technologies, Inc. and L3Harris Maritime Services Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$3,656,012	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
27	Clayton Associates Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$3,165,847	0.5%	Rank history: #23 in FY2021, #59 in FY2022, #28 in FY2023 and #19 in FY2024; down 8 since FY2024.
28	Accentz, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security)	$3,110,681	0.5%	Rank history: #47 in FY2021, #21 in FY2022, #35 in FY2023 and #62 in FY2024; up 34 since FY2024.
29	Meccs Mitomo JV Top agencies Navy (Department of the Navy)	$3,026,173	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
30	Aantilia LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$2,775,168	0.5%	Rank history: #97 in FY2021, #34 in FY2022, #57 in FY2023 and #76 in FY2024; up 46 since FY2024.
31	Aldevra LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DLA (Defense Logistics Agency)	$2,738,944	0.5%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and #95 in FY2024; up 64 since FY2024.
32	Alvest (USA) Inc. Through TLD America Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$2,718,380	0.5%	Rank history: not on the FY2021–FY2024 lists; up 149 since FY2024.
33	S I T Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$1,972,942	0.3%	Rank history: #60 in FY2021, #82 in FY2022, #95 in FY2023 and #47 in FY2024; up 14 since FY2024.
34	Janels Industries Inc. Top agencies DLA (Defense Logistics Agency)	$1,885,754	0.3%	Rank history: #24 in FY2021, #22 in FY2022, #19 in FY2023 and #38 in FY2024; up 4 since FY2024.
35	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$1,868,107	0.3%	Rank history: #55 in FY2021, #69 in FY2022, #54 in FY2023 and #50 in FY2024; up 15 since FY2024.
36	Howden USA Company 2 awardees, including Howden North America Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,829,620	0.3%	Rank history: not on the FY2021–FY2022 lists, #24 in FY2023 and #14 in FY2024; down 22 since FY2024.
37	Ashland Electric Products Inc. Top agencies DLA (Defense Logistics Agency)	$1,827,857	0.3%	Rank history: #21 in FY2021, #23 in FY2022, #32 in FY2023 and #26 in FY2024; down 11 since FY2024.
38	R & M Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$1,819,289	0.3%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2023 and #51 in FY2024; up 13 since FY2024.
39	Quality Refrigeration Company, Inc. 2 awardees Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,683,552	0.3%	Rank history: #41 in FY2021, #56 in FY2022, #76 in FY2023 and #57 in FY2024; up 18 since FY2024.
40	RTX Corporation 5 awardees, including Hamilton Sundstrand Corporation and Raytheon Company Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,669,763	0.3%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2024; up 4 since FY2024.
41	Government of the United States Through Federal Prison Industries, Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture) VA (Department of Veterans Affairs)	$1,620,513	0.3%	Rank history: #53 in FY2021, #95 in FY2022, #49 in FY2023 and #29 in FY2024; down 12 since FY2024.
42	Redlands Manufacturing Co LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,535,593	0.3%	Rank history: not on the FY2021–FY2024 lists; up 286 since FY2024.
43	Ronal Industries, Inc. Top agencies Army (Department of the Army)	$1,506,120	0.3%	Rank history: not on the FY2021–FY2024 lists; up 290 since FY2024.
44	The Electric Heater Co Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,398,042	0.2%	Rank history: not on the FY2021–FY2024 lists; up 442 since FY2024.
45	OST Services, LLC Top agencies VA (Department of Veterans Affairs)	$1,394,185	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
46	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$1,365,675	0.2%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2023 and #70 in FY2024; up 24 since FY2024.
47	Arabi Company WLL Top agencies Army (Department of the Army)	$1,322,390	0.2%	Rank history: not on the FY2021–FY2022 lists, #38 in FY2023 and #24 in FY2024; down 23 since FY2024.
48	Lektron Inc. Top agencies Army (Department of the Army)	$1,317,584	0.2%	Rank history: #78 in FY2021, #28 in FY2022, #94 in FY2023 and #56 in FY2024; up 8 since FY2024.
49	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,272,674	0.2%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2023 and #84 in FY2024; up 35 since FY2024.
50	Lockheed Martin Corporation 5 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,226,519	0.2%	Rank history: not on the FY2021 list, #25 in FY2022, #53 in FY2023 and not on the FY2024 list; returned.
51	Chesapeake Marine Refrigeration Corp Top agencies Navy (Department of the Navy)	$1,223,347	0.2%	Rank history: #86 in FY2021, not on the FY2022–FY2023 lists and #36 in FY2024; down 15 since FY2024.
52	Parker-Hannifin Corp Top agencies DLA (Defense Logistics Agency)	$1,207,969	0.2%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2024; down 15 since FY2024.
53	Results Sales & Service, L.L.C. Top agencies VA (Department of Veterans Affairs)	$1,176,485	0.2%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2024; up 37 since FY2024.
54	Integrated Procurement Technologies Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,163,082	0.2%	Rank history: not on the FY2021–FY2024 lists; up 53 since FY2024.
55	Nanosonic Inc. Top agencies USAF (Department of the Air Force)	$1,147,092	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
56	Warfighter Focused Logistics Inc. Top agencies DLA (Defense Logistics Agency)	$1,117,804	0.2%	Rank history: not on the FY2021 list, #78 in FY2022, #65 in FY2023 and #92 in FY2024; up 36 since FY2024.
57	Kihomac Inc. Top agencies DLA (Defense Logistics Agency)	$1,080,528	0.2%	Rank history: not on the FY2021–FY2024 lists; up 116 since FY2024.
58	Phoenix Systems Engineering Inc. Top agencies DLA (Defense Logistics Agency)	$1,066,285	0.2%	Rank history: #44 in FY2021, #39 in FY2022, #46 in FY2023 and #59 in FY2024; up 1 since FY2024.
59	Chand, L.L.C. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,063,949	0.2%	Rank history: not on the FY2021–FY2024 lists; up 306 since FY2024.
60	Mission Critical Project Services Inc. Top agencies DISA (Defense Information Systems Agency) Commerce (Department of Commerce)	$1,062,800	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
61	Astrea Group for Trading and Contracting Top agencies USAF (Department of the Air Force)	$1,011,983	0.2%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023 and #77 in FY2024; up 16 since FY2024.
62	Honeywell International Inc. 3 awardees, including Honeywell Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$1,009,586	0.2%	Rank history: #3 in FY2021, #8 in FY2022, #7 in FY2023 and #2 in FY2024; down 60 since FY2024.
63	CPI Electron Device Business, Inc. Top agencies Navy (Department of the Navy)	$938,950	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
64	Sierra Nevada Company, LLC Top agencies Navy (Department of the Navy)	$905,402	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
65	Logis-Tech, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$887,923	0.2%	Rank history: #48 in FY2021, not on the FY2022 list, #31 in FY2023 and not on the FY2024 list; returned.
66	Prime Veritas General Trading & Contracting Top agencies USAF (Department of the Air Force)	$864,799	0.1%	Rank history: not on the FY2021 list, #57 in FY2022 and not on the FY2023–FY2024 lists; up 295 since FY2024.
67	Xenex Disinfection Services Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$863,996	0.1%	Rank history: #49 in FY2021, #37 in FY2022, #51 in FY2023 and #32 in FY2024; down 35 since FY2024.
68	Cardinal Scientific, Inc. Top agencies Navy (Department of the Navy)	$850,716	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
69	Sky Creative for Trading and Contracting Company Top agencies USAF (Department of the Air Force)	$840,136	0.1%	Rank history: #69 in FY2021, not on the FY2022–FY2023 lists and #48 in FY2024; down 21 since FY2024.
70	Trillamed LLC Top agencies VA (Department of Veterans Affairs)	$835,701	0.1%	Rank history: not on the FY2021 list, #93 in FY2022, not on the FY2023 list and #98 in FY2024; up 28 since FY2024.
71	Dela Technology Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$831,930	0.1%	Rank history: not on the FY2021 list, #53 in FY2022, #37 in FY2023 and #45 in FY2024; down 26 since FY2024.
72	LCF Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$824,097	0.1%	Rank history: not on the FY2021–FY2024 lists; up 54 since FY2024.
73	J.G.B. Enterprises Inc. Through Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$823,581	0.1%	Rank history: not on the FY2021–FY2024 lists; up 154 since FY2024.
74	The L.c.doane Company Top agencies DLA (Defense Logistics Agency)	$819,504	0.1%	Rank history: #70 in FY2021, #71 in FY2022, #52 in FY2023 and #65 in FY2024; down 9 since FY2024.
75	Pacific International Trading Contracting and Services Top agencies USAF (Department of the Air Force)	$806,624	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023 and #60 in FY2024; down 15 since FY2024.
76	Admartec, Inc. Top agencies Navy (Department of the Navy)	$794,900	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
77	Bobar Ltd. Through Shalon Chemical Industries Ltd. Top agencies USAF (Department of the Air Force)	$784,700	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
78	VWR International LLC Through Labrepco LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$765,479	0.1%	Rank history: not on the FY2021–FY2023 lists and #27 in FY2024; down 51 since FY2024.
79	Brown Helicopter, Inc. Top agencies DLA (Defense Logistics Agency)	$762,255	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
80	Great Lakes Sound & Vibration Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$762,238	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
81	Larkos Packing and Distribution Inc. Top agencies DLA (Defense Logistics Agency)	$757,510	0.1%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 19 since FY2024.
82	Technologisty LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOJ (Department of Justice)	$751,386	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
83	Lake Shore Systems Inc. Top agencies Navy (Department of the Navy)	$738,262	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
84	Linmarr Associates, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$733,316	0.1%	Rank history: not on the FY2021 list, #81 in FY2022 and not on the FY2023–FY2024 lists; up 39 since FY2024.
85	Trane U.s. Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USAF (Department of the Air Force)	$717,080	0.1%	Rank history: not on the FY2021 list, #31 in FY2022 and not on the FY2023–FY2024 lists; up 54 since FY2024.
86	Winergy LLC Top agencies VA (Department of Veterans Affairs)	$714,417	0.1%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2024; down 22 since FY2024.
87	Cospolich Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$697,743	0.1%	Rank history: not on the FY2021–FY2024 lists; up 243 since FY2024.
88	VC Displays, Inc. Top agencies DLA (Defense Logistics Agency)	$697,733	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
89	J.t. Systems, Inc. Top agencies Navy (Department of the Navy)	$695,600	0.1%	Rank history: #88 in FY2021, not on the FY2022–FY2023 lists and #67 in FY2024; down 22 since FY2024.
90	Portable Air Group LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$687,651	0.1%	Rank history: #81 in FY2021, #68 in FY2022, #39 in FY2023 and #33 in FY2024; down 57 since FY2024.
91	Export 220Volt Inc. Top agencies DOS (Department of State) DLA (Defense Logistics Agency)	$678,428	0.1%	Rank history: #90 in FY2021, #32 in FY2022, #84 in FY2023 and #55 in FY2024; down 36 since FY2024.
92	Rural Route 2, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$658,080	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
93	Save Again.com Top agencies Navy (Department of the Navy) DOJ (Department of Justice) USAF (Department of the Air Force)	$656,505	0.1%	Rank history: not on the FY2021–FY2024 lists; up 188 since FY2024.
94	Johnson & Towers LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$651,669	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
95	Apex Integrated Distribution Inc. Top agencies VA (Department of Veterans Affairs)	$649,197	0.1%	Rank history: not on the FY2021–FY2024 lists; up 117 since FY2024.
96	Nova Facility Solutions Inc. Top agencies DOJ (Department of Justice)	$644,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
97	RSE Inc. Top agencies Army (Department of the Army)	$640,235	0.1%	Rank history: #11 in FY2021, not on the FY2022 list, #61 in FY2023 and #82 in FY2024; down 15 since FY2024.
98	Apex Pinnacle Corp Top agencies DLA (Defense Logistics Agency)	$624,913	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
99	Meak Solutions Llc. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) Army (Department of the Army)	$599,421	0.1%	Rank history: not on the FY2021–FY2024 lists; up 10 since FY2024.
100	Johnson Controls Inc 3 awardees, including Johnson Controls Industries Top agencies NASA (National Aeronautics and Space Administration) VA (Department of Veterans Affairs) DOS (Department of State)	$599,215	0.1%	Rank history: not on the FY2021–FY2024 lists; up 38 since FY2024.

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100 of 1,203 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 3334

Code	Net obligations	Largest contractor
33341 Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing	$549,384,959	Johnson Controls Navy Systems, LLC

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 $580 million obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2025 ran Oct 1, 2024 – Sep 30, 2025. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2024. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2024 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 3334 contractors in FY2025?

1. Johnson Controls Navy Systems, LLC ($142M), 2. Simulation Technologies Inc ($49.7M), 3. HDT Expeditionary Systems Inc. ($23.2M), 4. Pioneer Industries, LLC ($14.2M), 5. The O.c. Lugo Co Inc. ($13.4M), 6. Leonardo S.p.A. ($11.7M), 7. Trident Maritime Systems, Inc. ($10.7M), 8. FM AF, LLC ($10.5M), 9. Mainstream Engineering Corp ($9.18M), 10. On-Point Defense Technologies LLC ($8.68M).

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