Top 100 Contractors in NAICS 2382: Building Equipment Contractors, FY2021

Name: Top 100 Contractors in NAICS 2382: Building Equipment Contractors, FY2021
Creator: GovTribe

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

The top 10 won 24% of FY2021 NAICS 2382 contract dollars

Contract obligations: $1,820,854,184 Net of deobligations, by contracts coded NAICS 2382 or a code under it
Contractors: 3,661 Parent companies with an obligation
Largest contractor: M.c. Dean, Inc. $159 million, 8.2% 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	M.c. Dean, Inc. Top agencies Army (Department of the Army) DOJ (Department of Justice) Smithsonian (Smithsonian Institution)	$159,406,452	8.2%	Rank history: #12 in FY2022, #5 in FY2023, #53 in FY2024 and #10 in FY2025; up 3 since FY2020.
2	Xator LLC 2 awardees, including Incadence Strategic Solutions LLC Top agencies DOS (Department of State) Army (Department of the Army)	$94,993,611	4.9%	Rank history: #1 in FY2022, #1 in FY2023, #12 in FY2024 and not on the FY2025 list; down 1 since FY2020.
3	WSP USA Solutions Inc. Top agencies Army (Department of the Army)	$45,666,230	2.4%	Rank history: #2 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
4	Afci-Cci JV One LLC Top agencies VA (Department of Veterans Affairs)	$28,294,948	1.5%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
5	North State Mechanical Inc. Top agencies Navy (Department of the Navy)	$27,741,600	1.4%	Rank history: #25 in FY2022, #15 in FY2023, #18 in FY2024 and #11 in FY2025; up 60 since FY2020.
6	Four Tribes Enterprises, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$25,455,691	1.3%	Rank history: #68 in FY2022, #90 in FY2023, #73 in FY2024 and not on the FY2025 list; up 6 since FY2020.
7	Redtown LLC Through Redtown Technical Services, LLC Top agencies Army (Department of the Army)	$21,527,127	1.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
8	Elevated Technologies Services, LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$18,963,564	1.0%	Rank history: #5 in FY2022, #2 in FY2023, #11 in FY2024 and #5 in FY2025; up 8 since FY2020.
9	Wells Global, LLC Top agencies DOT (Department of Transportation)	$17,642,109	0.9%	Rank history: #8 in FY2022, #3 in FY2023, #10 in FY2024 and #4 in FY2025; down 6 since FY2020.
10	Innovative Support Solutions, Inc. Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) Army (Department of the Army)	$17,514,199	0.9%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
11	Kone Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) DOI (Department of the Interior) VA (Department of Veterans Affairs)	$15,668,648	0.8%	Rank history: #33 in FY2022, #27 in FY2023 and not on the FY2024–FY2025 lists; up 36 since FY2020.
12	TK Elevator Corporation 19 awardees Top agencies AOUSC (Administrative Office of the U.S. Courts) GSA (General Services Administration) DOJ (Department of Justice)	$15,136,340	0.8%	Rank history: #6 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
13	T1 Construction LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$12,798,004	0.7%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
14	Orcom, A Division of Ortega Companies, Inc. Top agencies Commerce (Department of Commerce) USAF (Department of the Air Force) Army (Department of the Army)	$11,035,467	0.6%	Rank history: not on the FY2022–FY2025 lists; up 209 since FY2020.
15	Tutor Perini Corporation 2 awardees, including Fisk Electric Company Top agencies DOI (Department of the Interior) DOJ (Department of Justice)	$10,747,002	0.6%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
16	Qcm, Inc. Top agencies WHS (DOD Washington Headquarters Service) Commerce (Department of Commerce) GSA (General Services Administration)	$10,337,503	0.5%	Rank history: #39 in FY2022, #28 in FY2023, #19 in FY2024 and #47 in FY2025; up 7 since FY2020.
17	Garco Wemco A Joint Venture Top agencies Army (Department of the Army) DOE (Department of Energy)	$10,123,671	0.5%	Rank history: #24 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; up 54 since FY2020.
18	Groupe Reel Through Reel COH Inc. Top agencies Army (Department of the Army)	$9,601,984	0.5%	Rank history: not on the FY2022–FY2025 lists; up 119 since FY2020.
19	Greenland Enterprises, Inc. Top agencies VA (Department of Veterans Affairs)	$9,205,000	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
20	Cusa Consulting LLC Top agencies DOT (Department of Transportation)	$8,722,924	0.4%	Rank history: #19 in FY2022, #6 in FY2023, #6 in FY2024 and #39 in FY2025; down 14 since FY2020.
21	The Ryan Group Inc Through Ryan & Associates, Inc. Top agencies Army (Department of the Army)	$8,677,160	0.4%	Rank history: #71 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; up 138 since FY2020.
22	Spectrum Electrical Services, Inc. Top agencies DOS (Department of State)	$8,586,161	0.4%	Rank history: #88 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; up 101 since FY2020.
23	Welch Construction Inc. Top agencies VA (Department of Veterans Affairs)	$8,563,400	0.4%	Rank history: not on the FY2022–FY2024 lists and #67 in FY2025; new, not ranked in FY2020.
24	The Whiting-Turner Contracting Company Top agencies Navy (Department of the Navy)	$8,525,779	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
25	Louis Berger U.S. Inc. Through Louis Berger Power, LLC Top agencies Army (Department of the Army)	$8,516,741	0.4%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
26	Firelake Construction Inc. 2 awardees Top agencies USDA (Department of Agriculture) Navy (Department of the Navy) DOT (Department of Transportation)	$7,652,857	0.4%	Rank history: #38 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; up 120 since FY2020.
27	Koniag, Inc. 3 awardees, including Tuknik Government Services LLC Top agencies DOS (Department of State)	$7,536,254	0.4%	Rank history: #22 in FY2022, #20 in FY2023, not on the FY2024 list and #81 in FY2025; up 37 since FY2020.
28	Heffler Contracting Group 2 awardees Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$7,432,831	0.4%	Rank history: not on the FY2022 list, #26 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
29	CCI Mechanical, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$7,392,194	0.4%	Rank history: not on the FY2022–FY2023 lists, #24 in FY2024 and not on the FY2025 list; up 135 since FY2020.
30	Messer Construction Co Top agencies Army (Department of the Army)	$7,115,000	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	UD Contracting Inc. Top agencies Army (Department of the Army)	$6,923,583	0.4%	Rank history: #42 in FY2022, #46 in FY2023, #45 in FY2024 and not on the FY2025 list; up 1 since FY2020.
32	Titus JV LLC Top agencies VA (Department of Veterans Affairs)	$6,832,298	0.4%	Rank history: not on the FY2022–FY2025 lists; up 57 since FY2020.
33	G-W Management Services, LLC Top agencies Navy (Department of the Navy)	$6,800,000	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Bristol Prime Contractors, LLC Top agencies Army (Department of the Army) Treasury (Department of the Treasury)	$6,452,792	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Gulf Pacific Contracting LLC Top agencies USAF (Department of the Air Force)	$6,379,005	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Nova Group Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$6,376,552	0.3%	Rank history: not on the FY2022–FY2025 lists; up 95 since FY2020.
37	Butt Construction Company, Incorporated Top agencies Army (Department of the Army)	$6,292,000	0.3%	Rank history: not on the FY2022–FY2023 lists, #16 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
38	Sun Construction Services Inc. Top agencies USAF (Department of the Air Force) GSA (General Services Administration) DHS (Department of Homeland Security)	$6,278,019	0.3%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
39	Venergy Group LLC Top agencies VA (Department of Veterans Affairs)	$6,242,380	0.3%	Rank history: not on the FY2022–FY2023 lists, #44 in FY2024 and #43 in FY2025; new, not ranked in FY2020.
40	Paradigm Mechanical Corp. Top agencies Navy (Department of the Navy) IBWC (International Boundary and Water Commission U.S.-Mexico)	$6,151,901	0.3%	Rank history: #63 in FY2022, #35 in FY2023, #79 in FY2024 and not on the FY2025 list; up 36 since FY2020.
41	Ljbco Group LLC Top agencies VA (Department of Veterans Affairs)	$5,982,825	0.3%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
42	Kaser Mechanical LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$5,948,439	0.3%	Rank history: #82 in FY2022, not on the FY2023 list, #54 in FY2024 and #40 in FY2025; up 26 since FY2020.
43	Johnsondanforth, Inc. Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) Army (Department of the Army)	$5,893,683	0.3%	Rank history: #13 in FY2022 and not on the FY2023–FY2025 lists; up 17 since FY2020.
44	Precision Resources Inc. Through Precision Mechanical Inc. Top agencies NASA (National Aeronautics and Space Administration)	$5,763,054	0.3%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
45	Ashland Industrial Services, LLC Through A&E Elevator, LLC Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service)	$5,710,852	0.3%	Rank history: #45 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
46	Second Avenue Contractors, LLC Top agencies DOJ (Department of Justice)	$5,690,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	Richard Group LLC Top agencies VA (Department of Veterans Affairs)	$5,614,900	0.3%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
48	Public Works Contractor Inc. Top agencies Navy (Department of the Navy)	$5,326,593	0.3%	Rank history: #47 in FY2022, not on the FY2023 list, #64 in FY2024 and not on the FY2025 list; down 33 since FY2020.
49	Property & Environmental Management Inc. Top agencies DOS (Department of State)	$5,256,951	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Cherokee Nation Environmental Solutions, L.L.C. Top agencies Treasury (Department of the Treasury) USAF (Department of the Air Force)	$5,185,612	0.3%	Rank history: not on the FY2022–FY2025 lists; up 164 since FY2020.
51	Johnson Controls Security Solutions LLC 31 awardees, including Johnson Controls Inc., Johnson Controls Fire Protection LP and Johnson Controls Building Automation Systems, LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture) WHS (DOD Washington Headquarters Service)	$5,181,348	0.3%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; up 28 since FY2020.
52	Sentinel Power Services, LLC Top agencies DOT (Department of Transportation)	$5,127,941	0.3%	Rank history: #14 in FY2022, #39 in FY2023, #23 in FY2024 and #20 in FY2025; down 32 since FY2020.
53	Meccs Mitomo JV Top agencies Navy (Department of the Navy)	$5,016,754	0.3%	Rank history: not on the FY2022–FY2025 lists; up 146 since FY2020.
54	Engineering Services Int'l, LLC Top agencies DOJ (Department of Justice)	$5,000,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	EMCOR Group, Inc. 10 awardees, including Emcor Government Services, Inc., Dynalectric Co and Fluidics Inc. Top agencies WHS (DOD Washington Headquarters Service) Navy (Department of the Navy) Treasury (Department of the Treasury)	$4,974,561	0.3%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; up 49 since FY2020.
56	The Povolny Group Inc. Top agencies VA (Department of Veterans Affairs)	$4,915,689	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	KJS Support Services Joint Venture LLC Top agencies Army (Department of the Army)	$4,906,553	0.3%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
58	Davcon Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$4,877,715	0.3%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 99 since FY2020.
59	Pick Electric, Inc. Top agencies Army (Department of the Army)	$4,760,129	0.2%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
60	South Bay EDC Inc. Top agencies Navy (Department of the Navy)	$4,759,590	0.2%	Rank history: #50 in FY2022, not on the FY2023 list, #94 in FY2024 and not on the FY2025 list; up 246 since FY2020.
61	KIK Technologies LLC Top agencies DOT (Department of Transportation)	$4,759,478	0.2%	Rank history: not on the FY2022 list, #77 in FY2023, #56 in FY2024 and #62 in FY2025; up 202 since FY2020.
62	Tanadgusix Corporation 2 awardees, including TDX Global Solutions, LLC and TDX Power Services LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$4,744,624	0.2%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
63	New Dominion Construction LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$4,738,940	0.2%	Rank history: not on the FY2022–FY2024 lists and #51 in FY2025; up 251 since FY2020.
64	Vanguard Pacific, LLC Top agencies Army (Department of the Army)	$4,681,496	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Siemens Aktiengesellschaft 5 awardees, including Siemens Industry Inc., Siemens Government Technologies Inc. and Siemens Mobility GMBH Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$4,638,526	0.2%	Rank history: not on the FY2022 list, #92 in FY2023 and not on the FY2024–FY2025 lists; up 131 since FY2020.
66	CFE Distribucion, E.p.s. Top agencies DOS (Department of State)	$4,593,902	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Professionals HIR LLC Top agencies DHS (Department of Homeland Security) GSA (General Services Administration) Navy (Department of the Navy)	$4,475,305	0.2%	Rank history: not on the FY2022–FY2025 lists; up 227 since FY2020.
68	Jett's Mechanical, LLC Top agencies VA (Department of Veterans Affairs)	$4,458,912	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Brican, Inc. Top agencies GSA (General Services Administration) Commerce (Department of Commerce) VA (Department of Veterans Affairs)	$4,421,826	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	United Technologies, LLC Top agencies Army (Department of the Army) GSA (General Services Administration) USAF (Department of the Air Force)	$4,403,163	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Civil Works Contracting LLC Top agencies Navy (Department of the Navy)	$4,362,138	0.2%	Rank history: not on the FY2022–FY2025 lists; down 61 since FY2020.
72	MIK Construction Inc. Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$4,357,698	0.2%	Rank history: not on the FY2022 list, #45 in FY2023, #33 in FY2024 and #13 in FY2025; up 116 since FY2020.
73	Handuk Iron-Mine & Construction Co. Ltd Top agencies Army (Department of the Army)	$4,322,948	0.2%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 45 since FY2020.
74	Icarus Construction Services, LLC Top agencies DOL (Department of Labor)	$4,291,556	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	CE Power Engineered Services LLC Through Reuter & Hanney, Inc. Top agencies Treasury (Department of the Treasury)	$4,264,283	0.2%	Rank history: not on the FY2022–FY2025 lists; up 94 since FY2020.
76	Freedom Contracting Group, LLC Top agencies VA (Department of Veterans Affairs)	$4,258,378	0.2%	Rank history: not on the FY2022–FY2025 lists; up 74 since FY2020.
77	The Fields Group, LLC Top agencies Commerce (Department of Commerce) GSA (General Services Administration)	$4,221,658	0.2%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
78	Dawson Solutions, Inc. Top agencies Navy (Department of the Navy)	$4,212,863	0.2%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; down 61 since FY2020.
79	Millennium Fire Protection Corporation Top agencies Navy (Department of the Navy)	$4,203,786	0.2%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; up 267 since FY2020.
80	Mechworks Mechanical Contractors, Inc. Top agencies Navy (Department of the Navy) DODEA (Department of Defense Education Activity) DHS (Department of Homeland Security)	$4,180,582	0.2%	Rank history: #26 in FY2022, #8 in FY2023, #15 in FY2024 and #46 in FY2025; down 30 since FY2020.
81	T.c.i. Construction & Management Co., Inc. Top agencies VA (Department of Veterans Affairs)	$4,144,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Onopa Services LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$4,079,895	0.2%	Rank history: not on the FY2022–FY2025 lists; down 68 since FY2020.
83	TGW Landscaping & Contracting, Inc. Top agencies Army (Department of the Army)	$4,063,143	0.2%	Rank history: not on the FY2022–FY2025 lists; up 254 since FY2020.
84	Trane U.S. Inc. Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) USAF (Department of the Air Force)	$4,051,654	0.2%	Rank history: not on the FY2022–FY2025 lists; up 89 since FY2020.
85	SES Technologies LLC Top agencies NASA (National Aeronautics and Space Administration)	$4,046,157	0.2%	Rank history: not on the FY2022–FY2024 lists and #91 in FY2025; new, not ranked in FY2020.
86	PHK Construction LLC Top agencies USDA (Department of Agriculture) DOJ (Department of Justice)	$3,997,943	0.2%	Rank history: not on the FY2022 list, #66 in FY2023 and not on the FY2024–FY2025 lists; up 244 since FY2020.
87	Skyline Elevator Works, Inc. Top agencies VA (Department of Veterans Affairs)	$3,964,246	0.2%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
88	Saw Contracting, Inc. Top agencies VA (Department of Veterans Affairs)	$3,949,677	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Boonerang Consulting LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$3,948,628	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Brymak & Associates, Inc. Top agencies Navy (Department of the Navy) DFAS (Defense Finance and Accounting Service) Army (Department of the Army)	$3,919,614	0.2%	Rank history: not on the FY2022–FY2024 lists and #48 in FY2025; up 92 since FY2020.
91	Koontz Electric Company, Incorporated Top agencies Army (Department of the Army)	$3,914,828	0.2%	Rank history: not on the FY2022–FY2024 lists and #59 in FY2025; new, not ranked in FY2020.
92	Daniels Building Co Inc. Top agencies VA (Department of Veterans Affairs)	$3,907,238	0.2%	Rank history: not on the FY2022–FY2025 lists; up 83 since FY2020.
93	EOS Mechanical Inc. Top agencies VA (Department of Veterans Affairs)	$3,872,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	The C.d. Whitfield Co., LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$3,866,184	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Midwest Electrical Construction Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$3,838,643	0.2%	Rank history: not on the FY2022–FY2023 lists, #39 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
96	Kelly Construction Services Inc. Top agencies Navy (Department of the Navy) AOUSC (Administrative Office of the U.S. Courts)	$3,798,360	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Sergents Mechanical Systems Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation)	$3,779,081	0.2%	Rank history: not on the FY2022 list, #72 in FY2023 and not on the FY2024–FY2025 lists; down 24 since FY2020.
98	B & D Electric, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,716,287	0.2%	Rank history: not on the FY2022 list, #52 in FY2023, #47 in FY2024 and #44 in FY2025; down 50 since FY2020.
99	RHI LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$3,656,919	0.2%	Rank history: not on the FY2022–FY2025 lists; down 71 since FY2020.
100	Lowder Electric and Construction Corp Top agencies VA (Department of Veterans Affairs)	$3,626,985	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 3,661 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 2382

Code	Net obligations	Largest contractor
23822 Plumbing, Heating, and Air-Conditioning Contractors	$797,483,248	North State Mechanical Inc.
23821 Electrical Contractors and Other Wiring Installation Contractors	$791,705,129	M.c. Dean, Inc.
23829 Other Building Equipment Contractors	$231,665,807	Redtown 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 $1.94 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 2382 contractors in FY2021?

1. M.c. Dean, Inc. ($159M), 2. Xator LLC ($95M), 3. WSP USA Solutions Inc. ($45.7M), 4. Afci-Cci JV One LLC ($28.3M), 5. North State Mechanical Inc. ($27.7M), 6. Four Tribes Enterprises, LLC ($25.5M), 7. Redtown LLC ($21.5M), 8. Elevated Technologies Services, LLC ($19M), 9. Wells Global, LLC ($17.6M), 10. Innovative Support Solutions, Inc. ($17.5M).

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