Top 100 Contractors in NAICS 3334: Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing, Jul 2025–Jun 2026

Name: Top 100 Contractors in NAICS 3334: Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 57% of NAICS 3334 contract dollars from July 2025 through June 2026

Contract obligations: $625,622,649 Net of deobligations, by contracts coded NAICS 3334 or a code under it
Contractors: 1,121 Parent companies with an obligation
Largest contractor: Johnson Controls Navy Systems, LLC $180 million, 27.7% 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)	$180,396,841	27.7%	Rank history: not on the FY2021–FY2023 lists, #1 in FY2024 and #1 in FY2025; unchanged since Jul 2024–Jun 2025.
2	Simulation Technologies Inc Top agencies Army (Department of the Army)	$49,664,136	7.6%	Rank history: not on the FY2021–FY2024 lists and #2 in FY2025; new, not ranked in Jul 2024–Jun 2025.
3	HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$40,056,848	6.1%	Rank history: #58 in FY2021, not on the FY2022–FY2023 lists, #7 in FY2024 and #3 in FY2025; up 11 since Jul 2024–Jun 2025.
4	Mainstream Engineering Corp Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$23,149,707	3.6%	Rank history: not on the FY2021 list, #27 in FY2022, not on the FY2023 list, #5 in FY2024 and #9 in FY2025; up 3 since Jul 2024–Jun 2025.
5	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$20,443,638	3.1%	Rank history: #37 in FY2021, #19 in FY2022, #68 in FY2023, #63 in FY2024 and #4 in FY2025; unchanged since Jul 2024–Jun 2025.
6	Leonardo S.p.A. 4 awardees, including Engineered Coil Company, DRS Naval Power Systems Inc. and Pivotal Power Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$13,573,373	2.1%	Rank history: #7 in FY2021, #10 in FY2022, #30 in FY2023, #6 in FY2024 and #6 in FY2025; down 2 since Jul 2024–Jun 2025.
7	Ovc-Engineered Solutions LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$12,728,366	2.0%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
8	Trident Maritime Systems, Inc. Top agencies Navy (Department of the Navy)	$11,505,394	1.8%	Rank history: not on the FY2021–FY2024 lists and #7 in FY2025; up 171 since Jul 2024–Jun 2025.
9	The O.c. Lugo Co Inc. Top agencies DLA (Defense Logistics Agency)	$10,675,368	1.6%	Rank history: #16 in FY2021, #86 in FY2022, #10 in FY2023, #10 in FY2024 and #5 in FY2025; up 7 since Jul 2024–Jun 2025.
10	Cepeda Associates, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$9,112,903	1.4%	Rank history: #22 in FY2021, #5 in FY2022, #9 in FY2023, #8 in FY2024 and #11 in FY2025; down 2 since Jul 2024–Jun 2025.
11	On-Point Defense Technologies LLC Top agencies Army (Department of the Army)	$8,682,404	1.3%	Rank history: not on the FY2021–FY2023 lists, #4 in FY2024 and #10 in FY2025; down 5 since Jul 2024–Jun 2025.
12	Honeywell International Inc. 3 awardees, including Honeywell Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$7,645,864	1.2%	Rank history: #3 in FY2021, #8 in FY2022, #7 in FY2023, #2 in FY2024 and #62 in FY2025; down 9 since Jul 2024–Jun 2025.
13	FM AF, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$7,633,737	1.2%	Rank history: not on the FY2021–FY2024 lists and #8 in FY2025; down 1 since Jul 2024–Jun 2025.
14	Allclear Aerospace & Defense, Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) USAF (Department of the Air Force)	$7,327,036	1.1%	Rank history: not on the FY2021–FY2023 lists, #31 in FY2024 and #17 in FY2025; up 3 since Jul 2024–Jun 2025.
15	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) USAF (Department of the Air Force)	$6,265,666	1.0%	Rank history: #13 in FY2021, #15 in FY2022, #26 in FY2023, #18 in FY2024 and #22 in FY2025; up 12 since Jul 2024–Jun 2025.
16	Filtration Services, Inc. Top agencies DOJ (Department of Justice)	$5,825,964	0.9%	Rank history: #42 in FY2021, #13 in FY2022, #22 in FY2023, #16 in FY2024 and #16 in FY2025; up 4 since Jul 2024–Jun 2025.
17	Snowbird Technologies Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$4,906,855	0.8%	Rank history: not on the FY2021–FY2023 lists, #28 in FY2024 and #15 in FY2025; down 2 since Jul 2024–Jun 2025.
18	TL Services, Inc. Top agencies VA (Department of Veterans Affairs)	$4,498,691	0.7%	Rank history: not on the FY2021–FY2024 lists and #18 in FY2025; up 215 since Jul 2024–Jun 2025.
19	Meccs Mitomo JV Top agencies Navy (Department of the Navy)	$4,163,121	0.6%	Rank history: not on the FY2021–FY2024 lists and #29 in FY2025; up 6 since Jul 2024–Jun 2025.
20	ECI Defense Group, Inc. 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$4,136,251	0.6%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023, #34 in FY2024 and #19 in FY2025; up 8 since Jul 2024–Jun 2025.
21	Argo Turboserve Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$3,992,812	0.6%	Rank history: #18 in FY2021, #17 in FY2022, #25 in FY2023, #25 in FY2024 and #20 in FY2025; unchanged since Jul 2024–Jun 2025.
22	Clayton Associates Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$3,874,739	0.6%	Rank history: #23 in FY2021, #59 in FY2022, #28 in FY2023, #19 in FY2024 and #27 in FY2025; up 2 since Jul 2024–Jun 2025.
23	Janels Industries Inc. Top agencies DLA (Defense Logistics Agency)	$3,808,990	0.6%	Rank history: #24 in FY2021, #22 in FY2022, #19 in FY2023, #38 in FY2024 and #34 in FY2025; up 6 since Jul 2024–Jun 2025.
24	Pergravis Mission Critical Construction, LLC Top agencies DISA (Defense Information Systems Agency)	$3,333,535	0.5%	Rank history: #17 in FY2021, not on the FY2022–FY2023 lists, #58 in FY2024 and not on the FY2025 list; up 40 since Jul 2024–Jun 2025.
25	Cherokee Nation Armored Solutions, LLC Top agencies Army (Department of the Army)	$3,296,444	0.5%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
26	Aldevra LLC Top agencies VA (Department of Veterans Affairs) DECA (Defense Commissary Agency) Commerce (Department of Commerce)	$3,285,092	0.5%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023, #95 in FY2024 and #31 in FY2025; up 36 since Jul 2024–Jun 2025.
27	Alvest (USA) Inc. Through TLD America Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$2,784,960	0.4%	Rank history: not on the FY2021–FY2024 lists and #32 in FY2025; down 1 since Jul 2024–Jun 2025.
28	Meggitt Aerospace Limited 2 awardees, including Meggitt Defense Systems, Inc. and Meggitt North Hollywood Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$2,734,465	0.4%	Rank history: not on the FY2021–FY2023 lists, #66 in FY2024 and #12 in FY2025; down 10 since Jul 2024–Jun 2025.
29	L3Harris Technologies, Inc. 5 awardees, including L3Harris Maritime Power & Energy Solutions, Inc., L3Harris Maritime Services Inc. and IRF - Intelligent RF Solutions, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$2,663,376	0.4%	Rank history: not on the FY2021–FY2024 lists and #26 in FY2025; up 42 since Jul 2024–Jun 2025.
30	Windward Enterprises, LLC Top agencies DLA (Defense Logistics Agency)	$2,642,655	0.4%	Rank history: #12 in FY2021, #12 in FY2022, #17 in FY2023, #20 in FY2024 and #25 in FY2025; down 7 since Jul 2024–Jun 2025.
31	Aantilia LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) Army (Department of the Army)	$2,621,639	0.4%	Rank history: #97 in FY2021, #34 in FY2022, #57 in FY2023, #76 in FY2024 and #30 in FY2025; up 59 since Jul 2024–Jun 2025.
32	Parker-Hannifin Corp Top agencies DLA (Defense Logistics Agency)	$2,556,306	0.4%	Rank history: not on the FY2021–FY2023 lists, #37 in FY2024 and #52 in FY2025; up 7 since Jul 2024–Jun 2025.
33	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$2,414,244	0.4%	Rank history: #55 in FY2021, #69 in FY2022, #54 in FY2023, #50 in FY2024 and #35 in FY2025; up 4 since Jul 2024–Jun 2025.
34	Brothers Mechanical Services LLC Top agencies DOJ (Department of Justice) Navy (Department of the Navy) DOI (Department of the Interior)	$2,223,904	0.3%	Rank history: not on the FY2021–FY2025 lists; up 292 since Jul 2024–Jun 2025.
35	S I T Corporation Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$2,106,448	0.3%	Rank history: #60 in FY2021, #82 in FY2022, #95 in FY2023, #47 in FY2024 and #33 in FY2025; down 2 since Jul 2024–Jun 2025.
36	Lektron Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$2,084,753	0.3%	Rank history: #78 in FY2021, #28 in FY2022, #94 in FY2023, #56 in FY2024 and #48 in FY2025; up 53 since Jul 2024–Jun 2025.
37	Ashland Electric Products Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,035,786	0.3%	Rank history: #21 in FY2021, #23 in FY2022, #32 in FY2023, #26 in FY2024 and #37 in FY2025; down 2 since Jul 2024–Jun 2025.
38	Government of the United States Through Federal Prison Industries, Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture) DOJ (Department of Justice)	$2,013,665	0.3%	Rank history: #53 in FY2021, #95 in FY2022, #49 in FY2023, #29 in FY2024 and #41 in FY2025; up 5 since Jul 2024–Jun 2025.
39	Integrated Procurement Technologies Top agencies DLA (Defense Logistics Agency)	$1,801,273	0.3%	Rank history: not on the FY2021–FY2024 lists and #54 in FY2025; up 40 since Jul 2024–Jun 2025.
40	The Electric Heater Co Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$1,644,488	0.3%	Rank history: not on the FY2021–FY2024 lists and #44 in FY2025; up 14 since Jul 2024–Jun 2025.
41	Accentz, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security)	$1,627,182	0.2%	Rank history: #47 in FY2021, #21 in FY2022, #35 in FY2023, #62 in FY2024 and #28 in FY2025; down 10 since Jul 2024–Jun 2025.
42	Redlands Manufacturing Co LLC Top agencies DLA (Defense Logistics Agency)	$1,623,562	0.2%	Rank history: not on the FY2021–FY2024 lists and #42 in FY2025; up 221 since Jul 2024–Jun 2025.
43	Acme Products & Engineering Inc. Top agencies Navy (Department of the Navy)	$1,530,705	0.2%	Rank history: not on the FY2021–FY2025 lists; up 230 since Jul 2024–Jun 2025.
44	MCO Solutions, Inc. Top agencies DLA (Defense Logistics Agency)	$1,487,899	0.2%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2023 and not on the FY2024–FY2025 lists; up 70 since Jul 2024–Jun 2025.
45	Dela Technology Corporation Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) Navy (Department of the Navy)	$1,439,255	0.2%	Rank history: not on the FY2021 list, #53 in FY2022, #37 in FY2023, #45 in FY2024 and #71 in FY2025; up 33 since Jul 2024–Jun 2025.
46	OST Services, LLC Top agencies VA (Department of Veterans Affairs)	$1,394,185	0.2%	Rank history: not on the FY2021–FY2024 lists and #45 in FY2025; new, not ranked in Jul 2024–Jun 2025.
47	The L.c.doane Company Top agencies DLA (Defense Logistics Agency)	$1,321,891	0.2%	Rank history: #70 in FY2021, #71 in FY2022, #52 in FY2023, #65 in FY2024 and #74 in FY2025; up 98 since Jul 2024–Jun 2025.
48	Jgils, LLC Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,234,770	0.2%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2023, #70 in FY2024 and #46 in FY2025; up 13 since Jul 2024–Jun 2025.
49	RSE Inc. Top agencies Army (Department of the Army)	$1,225,240	0.2%	Rank history: #11 in FY2021, not on the FY2022 list, #61 in FY2023, #82 in FY2024 and #97 in FY2025; up 14 since Jul 2024–Jun 2025.
50	J.G.B. Enterprises Inc. Through Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$1,177,279	0.2%	Rank history: not on the FY2021–FY2024 lists and #73 in FY2025; up 50 since Jul 2024–Jun 2025.
51	Chand, L.L.C. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,144,453	0.2%	Rank history: not on the FY2021–FY2024 lists and #59 in FY2025; up 42 since Jul 2024–Jun 2025.
52	Dynamic Air Engineering, Inc. Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$1,132,493	0.2%	Rank history: #32 in FY2021, #89 in FY2022, #58 in FY2023, #41 in FY2024 and #24 in FY2025; down 30 since Jul 2024–Jun 2025.
53	Chesapeake Marine Refrigeration Corp Top agencies Navy (Department of the Navy)	$1,087,997	0.2%	Rank history: #86 in FY2021, not on the FY2022–FY2023 lists, #36 in FY2024 and #51 in FY2025; down 12 since Jul 2024–Jun 2025.
54	Page Contracting Services LLC Top agencies DHS (Department of Homeland Security)	$1,086,343	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
55	Larkos Packing and Distribution Inc. Top agencies DLA (Defense Logistics Agency)	$1,085,549	0.2%	Rank history: not on the FY2021–FY2023 lists, #100 in FY2024 and #81 in FY2025; up 48 since Jul 2024–Jun 2025.
56	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 and #60 in FY2025; new, not ranked in Jul 2024–Jun 2025.
57	R & M Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$1,027,660	0.2%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2023, #51 in FY2024 and #38 in FY2025; down 17 since Jul 2024–Jun 2025.
58	CD Mechanical, Inc. Top agencies USAF (Department of the Air Force) DOJ (Department of Justice) Navy (Department of the Navy)	$1,016,171	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
59	LCF Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$995,206	0.2%	Rank history: not on the FY2021–FY2024 lists and #72 in FY2025; up 15 since Jul 2024–Jun 2025.
60	Results Sales & Service, L.L.C. Top agencies VA (Department of Veterans Affairs)	$991,635	0.2%	Rank history: not on the FY2021–FY2023 lists, #90 in FY2024 and #53 in FY2025; up 108 since Jul 2024–Jun 2025.
61	VWR International LLC Through Labrepco LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) EPA (Environmental Protection Agency)	$970,484	0.1%	Rank history: not on the FY2021–FY2023 lists, #27 in FY2024 and #78 in FY2025; down 23 since Jul 2024–Jun 2025.
62	The Ryan Group Inc Through Ryan & Associates, Inc. Top agencies Army (Department of the Army)	$962,412	0.1%	Rank history: not on the FY2021–FY2025 lists; up 194 since Jul 2024–Jun 2025.
63	Four Points Technology, L.L.C. Top agencies VA (Department of Veterans Affairs)	$942,664	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
64	Lockheed Martin Corporation Top agencies DLA (Defense Logistics Agency)	$901,202	0.1%	Rank history: not on the FY2021 list, #25 in FY2022, #53 in FY2023, not on the FY2024 list and #50 in FY2025; down 12 since Jul 2024–Jun 2025.
65	Cardinal Scientific, Inc. Top agencies Navy (Department of the Navy)	$877,069	0.1%	Rank history: not on the FY2021–FY2024 lists and #68 in FY2025; up 7 since Jul 2024–Jun 2025.
66	S3 Aerodefense LLC Top agencies DLA (Defense Logistics Agency)	$867,133	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
67	TECH Service Solutions LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$864,589	0.1%	Rank history: not on the FY2021–FY2023 lists, #94 in FY2024 and not on the FY2025 list; up 126 since Jul 2024–Jun 2025.
68	Ray Blackman Enterprises, Inc. Top agencies DLA (Defense Logistics Agency)	$862,381	0.1%	Rank history: not on the FY2021–FY2025 lists; up 197 since Jul 2024–Jun 2025.
69	Linmarr Associates, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$837,409	0.1%	Rank history: not on the FY2021 list, #81 in FY2022, not on the FY2023–FY2024 lists and #84 in FY2025; up 37 since Jul 2024–Jun 2025.
70	Scioteq LLC Through Electromech Technologies LLC Top agencies DLA (Defense Logistics Agency)	$830,630	0.1%	Rank history: not on the FY2021–FY2025 lists; up 49 since Jul 2024–Jun 2025.
71	BML Construction LLC Top agencies USDA (Department of Agriculture)	$820,107	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
72	RTX Corporation 4 awardees, including Hamilton Sundstrand Corporation Top agencies Navy (Department of the Navy)	$815,816	0.1%	Rank history: not on the FY2021–FY2023 lists, #44 in FY2024 and #40 in FY2025; down 42 since Jul 2024–Jun 2025.
73	Astrea Group for Trading and Contracting Top agencies USAF (Department of the Air Force)	$812,912	0.1%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023, #77 in FY2024 and #61 in FY2025; down 8 since Jul 2024–Jun 2025.
74	Design West Technologies Inc. Top agencies Navy (Department of the Navy)	$784,500	0.1%	Rank history: #19 in FY2021, #43 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
75	Johnson Controls Inc 3 awardees, including Johnson Controls Industries Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services) DOS (Department of State)	$763,484	0.1%	Rank history: not on the FY2021–FY2024 lists and #100 in FY2025; up 1 since Jul 2024–Jun 2025.
76	J & J Mechanical and Construction Group LLC Top agencies VA (Department of Veterans Affairs)	$758,532	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
77	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$756,704	0.1%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2023, #84 in FY2024 and #49 in FY2025; down 17 since Jul 2024–Jun 2025.
78	Cospolich Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$751,884	0.1%	Rank history: not on the FY2021–FY2024 lists and #87 in FY2025; up 74 since Jul 2024–Jun 2025.
79	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 and #82 in FY2025; new, not ranked in Jul 2024–Jun 2025.
80	Par Defense Industries, LLC Top agencies DLA (Defense Logistics Agency)	$724,603	0.1%	Rank history: #85 in FY2021 and not on the FY2022–FY2025 lists; up 95 since Jul 2024–Jun 2025.
81	Surfacide, LLC Top agencies VA (Department of Veterans Affairs)	$706,489	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
82	JT West Construction, Inc. Top agencies USAF (Department of the Air Force)	$705,270	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
83	Meak Solutions Llc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DHS (Department of Homeland Security)	$701,488	0.1%	Rank history: not on the FY2021–FY2024 lists and #99 in FY2025; up 76 since Jul 2024–Jun 2025.
84	Sterileco LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$672,713	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
85	Millrock Technology Inc. Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$664,707	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
86	S.t.s. - Servizi Tecnologie E Sviluppo S.R.L. Top agencies DECA (Defense Commissary Agency)	$660,540	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
87	Aggreko LLC Top agencies VA (Department of Veterans Affairs)	$652,574	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
88	Rural Route 2, LLC Top agencies Navy (Department of the Navy)	$645,042	0.1%	Rank history: not on the FY2021–FY2024 lists and #92 in FY2025; new, not ranked in Jul 2024–Jun 2025.
89	Veterans Healthcare Supply Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$644,816	0.1%	Rank history: not on the FY2021–FY2025 lists; up 391 since Jul 2024–Jun 2025.
90	Kihomac Inc. Top agencies DLA (Defense Logistics Agency)	$640,496	0.1%	Rank history: not on the FY2021–FY2024 lists and #57 in FY2025; up 6 since Jul 2024–Jun 2025.
91	Veterans Aerospace LLC Top agencies DLA (Defense Logistics Agency)	$626,717	0.1%	Rank history: not on the FY2021–FY2025 lists; up 234 since Jul 2024–Jun 2025.
92	Seahorse Defense Supply, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$626,467	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
93	Arctic Slope Regional Corporation Through Asrc Federal Facilities Logistics, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$626,115	0.1%	Rank history: not on the FY2021–FY2025 lists; up 27 since Jul 2024–Jun 2025.
94	Lake Shore Systems Inc. Top agencies Navy (Department of the Navy)	$616,510	0.1%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; up 153 since Jul 2024–Jun 2025.
95	Jo-Kell Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$608,197	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
96	Clark Air Conditioning Systems, Inc. Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$605,482	0.1%	Rank history: not on the FY2021–FY2025 lists; up 55 since Jul 2024–Jun 2025.
97	Quality Refrigeration Company, Inc. 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$605,332	0.1%	Rank history: #41 in FY2021, #56 in FY2022, #76 in FY2023, #57 in FY2024 and #39 in FY2025; down 65 since Jul 2024–Jun 2025.
98	Danaher Corporation Through Leica Microsystems Inc. Top agencies VA (Department of Veterans Affairs)	$600,721	0.1%	Rank history: not on the FY2021–FY2025 lists; up 69 since Jul 2024–Jun 2025.
99	Xenex Disinfection Services Inc. Top agencies VA (Department of Veterans Affairs)	$591,914	0.1%	Rank history: #49 in FY2021, #37 in FY2022, #51 in FY2023, #32 in FY2024 and #67 in FY2025; down 63 since Jul 2024–Jun 2025.
100	Trillamed LLC Top agencies VA (Department of Veterans Affairs)	$586,427	0.1%	Rank history: not on the FY2021 list, #93 in FY2022, not on the FY2023 list, #98 in FY2024 and #70 in FY2025; down 14 since Jul 2024–Jun 2025.

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100 of 1,121 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	$625,622,649	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 $652 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 Jul 2025–Jun 2026?

1. Johnson Controls Navy Systems, LLC ($180M), 2. Simulation Technologies Inc ($49.7M), 3. HDT Expeditionary Systems Inc. ($40.1M), 4. Mainstream Engineering Corp ($23.1M), 5. Pioneer Industries, LLC ($20.4M), 6. Leonardo S.p.A. ($13.6M), 7. Ovc-Engineered Solutions LLC ($12.7M), 8. Trident Maritime Systems, Inc. ($11.5M), 9. The O.c. Lugo Co Inc. ($10.7M), 10. Cepeda Associates, Inc. ($9.11M).

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