Top 100 Contractors in NAICS 333413: Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 333413: Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing, FY2021
Creator: GovTribe

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

The top 10 won 46% of FY2021 NAICS 333413 contract dollars

Contract obligations: $75,128,757 Net of deobligations, by contracts coded NAICS 333413
Contractors: 425 Parent companies with an obligation
Largest contractor: RTX Corporation $6.48 million, 8.3% 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	RTX Corporation 4 awardees, including Hamilton Sundstrand Corporation and Raytheon Company Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$6,476,778	8.3%	Rank history: #3 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
2	Howden American Fan Company Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$4,887,281	6.3%	Rank history: #1 in FY2022, #5 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
3	Colfax Corporation Through Howden American Fan Company Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$4,825,130	6.2%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
4	RSE Inc. Top agencies Army (Department of the Army)	$3,772,892	4.8%	Rank history: #36 in FY2022, #17 in FY2023, #28 in FY2024 and #35 in FY2025; up 14 since FY2020.
5	Honeywell International Inc. Top agencies Army (Department of the Army)	$2,879,735	3.7%	Rank history: not on the FY2022–FY2023 lists, #2 in FY2024 and not on the FY2025 list; up 176 since FY2020.
6	O.C. Lugo Co. Inc. the Top agencies DLA (Defense Logistics Agency)	$2,848,689	3.6%	Rank history: #27 in FY2022, #4 in FY2023, #4 in FY2024 and #1 in FY2025; new, not ranked in FY2020.
7	Design West Technologies Inc. Top agencies Navy (Department of the Navy)	$2,747,742	3.5%	Rank history: #12 in FY2022, #2 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
8	Ashland Electric Products Inc. Top agencies DLA (Defense Logistics Agency)	$2,665,356	3.4%	Rank history: #8 in FY2022, #11 in FY2023, #11 in FY2024 and #15 in FY2025; down 1 since FY2020.
9	Cepeda Associates, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$2,364,606	3.0%	Rank history: #2 in FY2022, #3 in FY2023, #3 in FY2024 and #4 in FY2025; down 5 since FY2020.
10	Howden North America Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) Army (Department of the Army)	$2,166,728	2.8%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
11	Dynamic Air Engineering, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$1,588,115	2.0%	Rank history: #39 in FY2022, #15 in FY2023, #14 in FY2024 and #11 in FY2025; down 5 since FY2020.
12	Hansome Energy Systems Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,552,210	2.0%	Rank history: #4 in FY2022, #1 in FY2023, #1 in FY2024 and #5 in FY2025; up 384 since FY2020.
13	Aero Precision Industries LLC Through Allclear Aerospace & Defense, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,542,492	2.0%	Rank history: #13 in FY2022, #10 in FY2023, #10 in FY2024 and not on the FY2025 list; up 14 since FY2020.
14	Euramco Safety, Inc. Top agencies Navy (Department of the Navy)	$1,359,596	1.7%	Rank history: #17 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
15	Filtration Services, Inc. Top agencies DOJ (Department of Justice)	$1,304,496	1.7%	Rank history: #6 in FY2022, #7 in FY2023, #8 in FY2024 and #7 in FY2025; up 20 since FY2020.
16	Hi-Tech Air & Water Purification Systems, LLC Top agencies USAF (Department of the Air Force)	$1,185,418	1.5%	Rank history: not on the FY2022–FY2024 lists and #69 in FY2025; up 5 since FY2020.
17	Transdigm Group Incorporated 3 awardees, including Electromech Technologies LLC, Skurka Aerospace Inc. and Aerocontrolex Group, Inc. Top agencies DLA (Defense Logistics Agency)	$1,173,060	1.5%	Rank history: #69 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
18	TLD America Corporation Top agencies Navy (Department of the Navy)	$1,166,847	1.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	Hunter Defense Technolog Through HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army)	$1,009,582	1.3%	Rank history: #5 in FY2022, #13 in FY2023, #9 in FY2024 and not on the FY2025 list; down 18 since FY2020.
20	Super Vacuum Manufacturing Co., Inc. Top agencies Navy (Department of the Navy)	$1,004,329	1.3%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; up 28 since FY2020.
21	HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army)	$998,569	1.3%	Rank history: not on the FY2022–FY2023 lists, #5 in FY2024 and #27 in FY2025; up 3 since FY2020.
22	Noble Sales Co. Inc. 2 awardees, including Tactical & Survival Specialties, LLC and Noble Supply & Logistics, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$956,660	1.2%	Rank history: not on the FY2022–FY2025 lists; up 279 since FY2020.
23	Government of the United States 2 awardees, including Federal Prison Industries, Inc. Top agencies Army (Department of the Army) JFK (John F. Kennedy Center for the Performing Arts) DHA (Defense Health Agency)	$899,549	1.2%	Rank history: #29 in FY2022, #16 in FY2023, #13 in FY2024 and #17 in FY2025; up 7 since FY2020.
24	Lektron Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$699,308	0.9%	Rank history: #9 in FY2022, #24 in FY2023, #18 in FY2024 and #23 in FY2025; down 2 since FY2020.
25	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$685,960	0.9%	Rank history: #16 in FY2022, #19 in FY2023, #23 in FY2024 and #14 in FY2025; down 5 since FY2020.
26	3ON Systems Inc. Top agencies DLA (Defense Logistics Agency)	$614,457	0.8%	Rank history: #11 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
27	DCM Clean Air Products, Inc. Top agencies DLA (Defense Logistics Agency)	$499,896	0.6%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
28	Molecular Products Inc. Top agencies DLA (Defense Logistics Agency)	$497,508	0.6%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
29	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$482,527	0.6%	Rank history: #33 in FY2022, #21 in FY2023, #19 in FY2024 and #22 in FY2025; up 14 since FY2020.
30	Venergy Group LLC Top agencies VA (Department of Veterans Affairs)	$466,347	0.6%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
31	Cobham Advanced Electronic Solutions Inc. 2 awardees, including Frontgrade Technologies Inc. and Mission Systems Davenport Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$431,969	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Meggitt PLC Through Meggitt Defense Systems, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$418,429	0.5%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; down 22 since FY2020.
33	Abatement Technologies, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$408,360	0.5%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; up 84 since FY2020.
34	Airgle Corporation Top agencies HHS (Department of Health and Human Services)	$391,975	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Filtmore Technologies LLC Top agencies Army (Department of the Army)	$378,949	0.5%	Rank history: #23 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
36	Parker-Hannifin Corporation Top agencies DLA (Defense Logistics Agency)	$365,693	0.5%	Rank history: #28 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 82 since FY2020.
37	Refurbished Office Furniture, Inc. Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command)	$353,650	0.5%	Rank history: not on the FY2022–FY2025 lists; up 47 since FY2020.
38	Qleanair Scandinavia Inc. Top agencies VA (Department of Veterans Affairs)	$317,000	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Lux Solutions LLC Top agencies Navy (Department of the Navy)	$300,939	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Daughtridge Sales Company, Inc. Top agencies Navy (Department of the Navy)	$300,540	0.4%	Rank history: not on the FY2022–FY2024 lists and #85 in FY2025; new, not ranked in FY2020.
41	Powerhouse Equipment & Engineering Co. Inc. Through Quincy Compressor LLC Top agencies Navy (Department of the Navy)	$299,395	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	D Wheatley Enterprises Inc. Top agencies Army (Department of the Army)	$274,061	0.4%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
43	Colossal Contracting LLC Top agencies VA (Department of Veterans Affairs)	$271,254	0.3%	Rank history: not on the FY2022–FY2025 lists; up 80 since FY2020.
44	Brighton Cromwell LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$270,900	0.3%	Rank history: not on the FY2022–FY2025 lists; up 158 since FY2020.
45	Aantilia LLC Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) Army (Department of the Army)	$267,288	0.3%	Rank history: #18 in FY2022, #97 in FY2023, not on the FY2024 list and #88 in FY2025; up 8 since FY2020.
46	The Boeing Company 2 awardees, including Boeing Distribution, Inc. and Boeing Distribution Services, Inc. Top agencies DLA (Defense Logistics Agency)	$266,199	0.3%	Rank history: not on the FY2022 list, #57 in FY2023 and not on the FY2024–FY2025 lists; up 158 since FY2020.
47	Air Filter Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$262,204	0.3%	Rank history: #41 in FY2022, #45 in FY2023, #39 in FY2024 and #62 in FY2025; new, not ranked in FY2020.
48	Phoenix Systems Engineering Inc. Top agencies DLA (Defense Logistics Agency)	$260,281	0.3%	Rank history: #97 in FY2022, not on the FY2023 list, #29 in FY2024 and #32 in FY2025; up 21 since FY2020.
49	Sauer Compressors USA Inc. Top agencies Navy (Department of the Navy)	$233,771	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Sky Mart Sales Corp. Top agencies DLA (Defense Logistics Agency)	$222,763	0.3%	Rank history: #48 in FY2022, not on the FY2023–FY2024 lists and #50 in FY2025; new, not ranked in FY2020.
51	Basic Technologies Inc. Top agencies Army (Department of the Army)	$215,579	0.3%	Rank history: not on the FY2022–FY2023 lists, #62 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
52	IBP Consulting, Inc. Top agencies DLA (Defense Logistics Agency)	$210,645	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	NQ Industries, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$209,653	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	S I T Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$207,558	0.3%	Rank history: not on the FY2022–FY2023 lists, #44 in FY2024 and #72 in FY2025; up 7 since FY2020.
55	Dentech, Inc. Top agencies Commerce (Department of Commerce)	$206,090	0.3%	Rank history: not on the FY2022–FY2023 lists, #60 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
56	The Spencer Turbine Company Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$204,442	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Hamilton Sundstrand Corporation Top agencies Navy (Department of the Navy)	$202,220	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Jo-Kell Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$187,376	0.2%	Rank history: #80 in FY2022, not on the FY2023–FY2024 lists and #97 in FY2025; up 5 since FY2020.
59	JTM Enterprises LLC Top agencies DOI (Department of the Interior)	$187,348	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Progressive Industries Inc. Top agencies DOI (Department of the Interior)	$181,219	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Allient Inc. Through Globe Motors, Inc. Top agencies DLA (Defense Logistics Agency)	$170,555	0.2%	Rank history: #98 in FY2022, #96 in FY2023, #69 in FY2024 and #70 in FY2025; up 22 since FY2020.
62	Mid America Engine Inc. Top agencies Army (Department of the Army)	$169,315	0.2%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.
63	Motor Magnetics, Inc. Top agencies DLA (Defense Logistics Agency)	$168,350	0.2%	Rank history: not on the FY2022–FY2023 lists, #74 in FY2024 and #61 in FY2025; down 49 since FY2020.
64	Carrier Process Equipment Group Inc. Top agencies Army (Department of the Army)	$166,510	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Filtration Plus Inc. Top agencies DOE (Department of Energy)	$156,642	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Air Cleaning Technologies, Inc. Top agencies USAF (Department of the Air Force)	$156,391	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	U.s.a. Spares Inc. Top agencies Navy (Department of the Navy)	$155,300	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Dover Corporation Through Dover Pumps & Process Solutions Segment Inc. Top agencies Navy (Department of the Navy)	$154,495	0.2%	Rank history: #56 in FY2022, #82 in FY2023, #98 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
69	Adirondack Electronics Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$151,582	0.2%	Rank history: not on the FY2022–FY2025 lists; up 264 since FY2020.
70	L3Harris Technologies, Inc. 3 awardees, including L3Harris Maritime Power & Energy Solutions, Inc. and CAE USA Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$151,170	0.2%	Rank history: not on the FY2022 list, #73 in FY2023, not on the FY2024 list and #12 in FY2025; down 20 since FY2020.
71	Focus Healthcare Products LLC Top agencies Navy (Department of the Navy)	$148,130	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Leonardo S.p.A. 3 awardees, including DRS Naval Power Systems Inc., Engineered Coil Company and Pivotal Power Inc. Top agencies DLA (Defense Logistics Agency)	$147,824	0.2%	Rank history: #64 in FY2022, #70 in FY2023, #24 in FY2024 and #38 in FY2025; unchanged since FY2020.
73	Kihomac Inc. Top agencies DLA (Defense Logistics Agency)	$145,311	0.2%	Rank history: #57 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; down 32 since FY2020.
74	TRI-DIM Filter Corporation Top agencies VA (Department of Veterans Affairs) Smithsonian (Smithsonian Institution)	$135,113	0.2%	Rank history: not on the FY2022–FY2025 lists; up 155 since FY2020.
75	D.w. Boyd Corporation Top agencies Navy (Department of the Navy)	$134,973	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Air Quality Engineering Inc. Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$133,402	0.2%	Rank history: not on the FY2022–FY2025 lists; down 48 since FY2020.
77	Omega International LLC Top agencies Navy (Department of the Navy)	$133,166	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Aramsco Holdings, Inc. Through Aramsco, Inc. Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration)	$126,604	0.2%	Rank history: not on the FY2022–FY2025 lists; up 111 since FY2020.
79	Tel-Instrument Electronics Corp Top agencies Navy (Department of the Navy)	$125,956	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	US Air Purifiers LLC Top agencies HHS (Department of Health and Human Services) DOE (Department of Energy) Navy (Department of the Navy)	$125,383	0.2%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
81	W S Darley & Co Top agencies GSA (General Services Administration)	$124,921	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Westsim Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$122,848	0.2%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; up 124 since FY2020.
83	Southeastern Engineering Sales, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$119,069	0.2%	Rank history: not on the FY2022–FY2025 lists; up 202 since FY2020.
84	Daikin Applied Americas Inc 2 awardees, including American Air Filter Co Inc. Top agencies DOS (Department of State) Commerce (Department of Commerce) Smithsonian (Smithsonian Institution)	$117,521	0.2%	Rank history: not on the FY2022–FY2025 lists; up 62 since FY2020.
85	Pht Aerospace LLC Top agencies DLA (Defense Logistics Agency)	$113,763	0.1%	Rank history: not on the FY2022 list, #50 in FY2023, #80 in FY2024 and #66 in FY2025; new, not ranked in FY2020.
86	New Galaxy Air Conditioning and Refrigeration W.L.L. Top agencies USAF (Department of the Air Force)	$109,627	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	B & H International LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$108,634	0.1%	Rank history: not on the FY2022–FY2025 lists; down 48 since FY2020.
88	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$107,964	0.1%	Rank history: #31 in FY2022, #46 in FY2023, #35 in FY2024 and #20 in FY2025; down 50 since FY2020.
89	Baker & Associates Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$107,215	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$107,168	0.1%	Rank history: #91 in FY2022, #77 in FY2023, #37 in FY2024 and #83 in FY2025; down 2 since FY2020.
91	Esparza Pest Control and Eco-Logic Systems, Inc. Top agencies DOI (Department of the Interior)	$101,758	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Cherokee Nation Through Cherokee Nation Red Wing, L.L.C. Top agencies Army (Department of the Army)	$99,950	0.1%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
93	Export 220Volt Inc. Top agencies DOS (Department of State)	$97,575	0.1%	Rank history: #15 in FY2022, #29 in FY2023, #22 in FY2024 and #41 in FY2025; down 80 since FY2020.
94	Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$97,199	0.1%	Rank history: #99 in FY2022, #81 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
95	Mil Spec Inc. Top agencies DLA (Defense Logistics Agency)	$96,485	0.1%	Rank history: not on the FY2022–FY2025 lists; up 44 since FY2020.
96	A.m.s. Network, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$95,445	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Smith Eastern Corp Top agencies DLA (Defense Logistics Agency)	$95,035	0.1%	Rank history: not on the FY2022–FY2025 lists; up 124 since FY2020.
98	Unitherm Furnace LLC Top agencies Army (Department of the Army)	$93,759	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	AQW Inc. Top agencies DLA (Defense Logistics Agency)	$93,651	0.1%	Rank history: not on the FY2022 list, #79 in FY2023 and not on the FY2024–FY2025 lists; up 31 since FY2020.
100	Delta T, LLC Top agencies Navy (Department of the Navy) USDA (Department of Agriculture) DOJ (Department of Justice)	$92,542	0.1%	Rank history: #72 in FY2022, #39 in FY2023, #67 in FY2024 and not on the FY2025 list; up 52 since FY2020.

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100 of 425 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 $78.1 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 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 333413 contractors in FY2021?

1. RTX Corporation ($6.48M), 2. Howden American Fan Company ($4.89M), 3. Colfax Corporation ($4.83M), 4. RSE Inc. ($3.77M), 5. Honeywell International Inc. ($2.88M), 6. O.C. Lugo Co. Inc. the ($2.85M), 7. Design West Technologies Inc. ($2.75M), 8. Ashland Electric Products Inc. ($2.67M), 9. Cepeda Associates, Inc. ($2.36M), 10. Howden North America Inc. ($2.17M).

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