Top 100 Contractors in NAICS 23822: Plumbing, Heating, and Air-Conditioning Contractors, FY2021

Name: Top 100 Contractors in NAICS 23822: Plumbing, Heating, and Air-Conditioning Contractors, FY2021
Creator: GovTribe

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

The top 10 won 17% of FY2021 NAICS 23822 contract dollars

Contract obligations: $797,483,248 Net of deobligations, by contracts coded NAICS 23822 or a code under it
Contractors: 1,961 Parent companies with an obligation
Largest contractor: North State Mechanical Inc. $27.7 million, 3.3% 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	North State Mechanical Inc. Top agencies Navy (Department of the Navy)	$27,741,600	3.3%	Rank history: #9 in FY2022, #5 in FY2023, #8 in FY2024 and #3 in FY2025; up 29 since FY2020.
2	Four Tribes Enterprises, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$25,441,302	3.1%	Rank history: #28 in FY2022, #40 in FY2023, #36 in FY2024 and #89 in FY2025; up 5 since FY2020.
3	Afci-Cci JV One LLC Top agencies VA (Department of Veterans Affairs)	$24,035,948	2.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
4	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	1.3%	Rank history: not on the FY2022 list, #61 in FY2023 and not on the FY2024–FY2025 lists; up 109 since FY2020.
5	Qcm, Inc. Top agencies WHS (DOD Washington Headquarters Service) GSA (General Services Administration)	$9,246,881	1.1%	Rank history: #18 in FY2022, #17 in FY2023, #14 in FY2024 and #29 in FY2025; up 6 since FY2020.
6	Greenland Enterprises, Inc. Top agencies VA (Department of Veterans Affairs)	$9,205,000	1.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
7	The Ryan Group Inc Through Ryan & Associates, Inc. Top agencies Army (Department of the Army)	$8,677,160	1.0%	Rank history: #29 in FY2022, #27 in FY2023 and not on the FY2024–FY2025 lists; up 76 since FY2020.
8	Welch Construction Inc. Top agencies VA (Department of Veterans Affairs)	$8,563,400	1.0%	Rank history: not on the FY2022–FY2024 lists and #37 in FY2025; new, not ranked in FY2020.
9	The Whiting-Turner Contracting Company Top agencies Navy (Department of the Navy)	$8,525,779	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
10	Koniag, Inc. 2 awardees, including Tuknik Government Services LLC Top agencies DOS (Department of State)	$7,696,779	0.9%	Rank history: #7 in FY2022, #6 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
11	CCI Mechanical, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$7,392,194	0.9%	Rank history: #52 in FY2022, #100 in FY2023, #11 in FY2024 and #75 in FY2025; up 74 since FY2020.
12	Messer Construction Co Top agencies Army (Department of the Army)	$7,115,000	0.9%	Rank history: not on the FY2022–FY2023 lists, #66 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
13	Heffler Contracting Group 2 awardees Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$7,079,583	0.9%	Rank history: #87 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
14	UD Contracting Inc. Top agencies Army (Department of the Army)	$6,923,583	0.8%	Rank history: #16 in FY2022, #21 in FY2023, #21 in FY2024 and not on the FY2025 list; up 4 since FY2020.
15	G-W Management Services, LLC Top agencies Navy (Department of the Navy)	$6,800,000	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	Bristol Prime Contractors, LLC Top agencies Army (Department of the Army)	$6,438,930	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
17	Gulf Pacific Contracting LLC Top agencies USAF (Department of the Air Force)	$6,379,005	0.8%	Rank history: not on the FY2022–FY2024 lists and #83 in FY2025; new, not ranked in FY2020.
18	Butt Construction Company, Incorporated Top agencies Army (Department of the Army)	$6,292,000	0.8%	Rank history: not on the FY2022–FY2023 lists, #7 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
19	Firelake Construction Inc. Top agencies USDA (Department of Agriculture) DOT (Department of Transportation)	$6,205,456	0.7%	Rank history: #20 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; up 204 since FY2020.
20	Kaser Mechanical LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$5,948,439	0.7%	Rank history: #36 in FY2022, not on the FY2023 list, #25 in FY2024 and #16 in FY2025; up 12 since FY2020.
21	Precision Resources Inc. Through Precision Mechanical Inc. Top agencies NASA (National Aeronautics and Space Administration)	$5,763,054	0.7%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
22	Paradigm Mechanical Corp. Top agencies Navy (Department of the Navy) IBWC (International Boundary and Water Commission U.S.-Mexico)	$5,374,025	0.6%	Rank history: #26 in FY2022, #15 in FY2023, #40 in FY2024 and #67 in FY2025; up 12 since FY2020.
23	Public Works Contractor Inc. Top agencies Navy (Department of the Navy)	$5,326,593	0.6%	Rank history: #22 in FY2022, #73 in FY2023, #30 in FY2024 and not on the FY2025 list; down 18 since FY2020.
24	Property & Environmental Management Inc. Top agencies DOS (Department of State)	$5,256,951	0.6%	Rank history: not on the FY2022 list, #95 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
25	Cherokee Nation Environmental Solutions, L.L.C. Top agencies Treasury (Department of the Treasury)	$5,157,725	0.6%	Rank history: not on the FY2022–FY2025 lists; up 83 since FY2020.
26	KJS Support Services Joint Venture LLC Top agencies Army (Department of the Army)	$4,906,553	0.6%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
27	Davcon Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$4,877,715	0.6%	Rank history: #31 in FY2022, #66 in FY2023, not on the FY2024 list and #77 in FY2025; up 53 since FY2020.
28	Johnson Controls Security Solutions LLC 23 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)	$4,798,581	0.6%	Rank history: #13 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
29	New Dominion Construction LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$4,738,940	0.6%	Rank history: not on the FY2022 list, #86 in FY2023, #99 in FY2024 and #25 in FY2025; up 140 since FY2020.
30	Vanguard Pacific, LLC Top agencies Army (Department of the Army)	$4,681,496	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	EMCOR Group, Inc. 8 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)	$4,634,060	0.6%	Rank history: #46 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
32	Jett's Mechanical, LLC Top agencies VA (Department of Veterans Affairs)	$4,458,912	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	Innovative Support Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$4,408,165	0.5%	Rank history: not on the FY2022–FY2025 lists; down 24 since FY2020.
34	Civil Works Contracting LLC Top agencies Navy (Department of the Navy)	$4,362,138	0.5%	Rank history: not on the FY2022–FY2025 lists; down 31 since FY2020.
35	Icarus Construction Services, LLC Top agencies DOL (Department of Labor)	$4,291,556	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Dawson Solutions, Inc. Top agencies Navy (Department of the Navy)	$4,212,863	0.5%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
37	Millennium Fire Protection Corporation Top agencies Navy (Department of the Navy)	$4,203,786	0.5%	Rank history: #37 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; up 151 since FY2020.
38	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	0.5%	Rank history: #10 in FY2022, #2 in FY2023, #6 in FY2024 and #18 in FY2025; down 15 since FY2020.
39	The Fields Group, LLC Top agencies Commerce (Department of Commerce)	$4,170,379	0.5%	Rank history: not on the FY2022–FY2023 lists, #73 in FY2024 and not on the FY2025 list; up 10 since FY2020.
40	T.c.i. Construction & Management Co., Inc. Top agencies VA (Department of Veterans Affairs)	$4,144,000	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
41	South Bay EDC Inc. Top agencies Navy (Department of the Navy)	$4,080,883	0.5%	Rank history: #23 in FY2022, #46 in FY2023, #45 in FY2024 and not on the FY2025 list; up 118 since FY2020.
42	Onopa Services LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$4,079,895	0.5%	Rank history: not on the FY2022–FY2025 lists; down 38 since FY2020.
43	TGW Landscaping & Contracting, Inc. Top agencies Army (Department of the Army)	$4,063,143	0.5%	Rank history: not on the FY2022–FY2025 lists; up 140 since FY2020.
44	SES Technologies LLC Top agencies NASA (National Aeronautics and Space Administration)	$4,046,157	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
45	PHK Construction LLC Top agencies USDA (Department of Agriculture) DOJ (Department of Justice)	$3,997,943	0.5%	Rank history: #55 in FY2022, #25 in FY2023 and not on the FY2024–FY2025 lists; up 134 since FY2020.
46	Saw Contracting, Inc. Top agencies VA (Department of Veterans Affairs)	$3,949,677	0.5%	Rank history: not on the FY2022–FY2025 lists; up 327 since FY2020.
47	Brymak & Associates, Inc. Top agencies Navy (Department of the Navy) DFAS (Defense Finance and Accounting Service) Army (Department of the Army)	$3,919,614	0.5%	Rank history: #47 in FY2022, #63 in FY2023, #62 in FY2024 and #20 in FY2025; up 45 since FY2020.
48	EOS Mechanical Inc. Top agencies VA (Department of Veterans Affairs)	$3,872,000	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	The C.d. Whitfield Co., LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$3,866,184	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Boonerang Consulting LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$3,836,376	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Siemens Aktiengesellschaft 3 awardees, including Siemens Industry Inc. and Siemens Government Technologies Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) SSA (Social Security Administration)	$3,802,644	0.5%	Rank history: not on the FY2022 list, #84 in FY2023 and not on the FY2024–FY2025 lists; up 110 since FY2020.
52	Kelly Construction Services Inc. Top agencies Navy (Department of the Navy) AOUSC (Administrative Office of the U.S. Courts)	$3,798,360	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Sergents Mechanical Systems Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation)	$3,779,081	0.5%	Rank history: #96 in FY2022, #31 in FY2023, not on the FY2024 list and #59 in FY2025; down 17 since FY2020.
54	Ljbco Group LLC Top agencies VA (Department of Veterans Affairs)	$3,747,825	0.5%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
55	Quadrant Construction Inc. Top agencies Navy (Department of the Navy)	$3,603,596	0.4%	Rank history: not on the FY2022–FY2025 lists; down 53 since FY2020.
56	Professionals HIR LLC Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) DOI (Department of the Interior)	$3,597,220	0.4%	Rank history: not on the FY2022–FY2025 lists; up 98 since FY2020.
57	Multi Air Services Engineers, Corp 2 awardees Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) DOT (Department of Transportation)	$3,473,364	0.4%	Rank history: #12 in FY2022, #32 in FY2023, #56 in FY2024 and not on the FY2025 list; down 16 since FY2020.
58	Front Range Construction Inc. Top agencies Commerce (Department of Commerce) GSA (General Services Administration) USDA (Department of Agriculture)	$3,464,847	0.4%	Rank history: #60 in FY2022, #26 in FY2023, #90 in FY2024 and not on the FY2025 list; down 13 since FY2020.
59	All Phase Solutions LLC 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$3,361,673	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	RHI LLC Top agencies VA (Department of Veterans Affairs)	$3,357,888	0.4%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; down 46 since FY2020.
61	Meridien Group LLC Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$3,336,893	0.4%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
62	Siler Excavating LLC Top agencies Navy (Department of the Navy)	$3,309,506	0.4%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
63	PAE Government Services Inc. Through Amentum Design and Facility Management Top agencies Navy (Department of the Navy)	$3,177,703	0.4%	Rank history: not on the FY2022–FY2025 lists; down 28 since FY2020.
64	Snodgrass Contracting LLC Top agencies USAF (Department of the Air Force) USDA (Department of Agriculture)	$3,070,039	0.4%	Rank history: #58 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
65	Blue Oak Projects, LLC Top agencies USAF (Department of the Air Force)	$3,065,371	0.4%	Rank history: #8 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
66	USA Mechanical & Controls LLC Top agencies USAF (Department of the Air Force)	$3,011,361	0.4%	Rank history: not on the FY2022–FY2025 lists; up 339 since FY2020.
67	Unique Technical Solutions Inc. Top agencies USAF (Department of the Air Force)	$2,948,567	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	MIK Construction Inc. Top agencies Navy (Department of the Navy)	$2,897,398	0.3%	Rank history: #97 in FY2022, #20 in FY2023, #18 in FY2024 and #4 in FY2025; up 28 since FY2020.
69	Narito Sheetmetal & Mechanical Corporation Top agencies Army (Department of the Army)	$2,889,184	0.3%	Rank history: not on the FY2022–FY2025 lists; up 310 since FY2020.
70	Accord Federal Services, LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) DOT (Department of Transportation)	$2,837,558	0.3%	Rank history: not on the FY2022–FY2025 lists; up 28 since FY2020.
71	Tilt Up Construction, Inc. Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$2,831,177	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Accu-Aire Mechanical LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$2,813,048	0.3%	Rank history: not on the FY2022–FY2025 lists; up 93 since FY2020.
73	RCA Contracting, Inc. Top agencies USAF (Department of the Air Force)	$2,745,219	0.3%	Rank history: #66 in FY2022, #3 in FY2023 and not on the FY2024–FY2025 lists; up 74 since FY2020.
74	Core Mechanical, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) Army (Department of the Army)	$2,714,971	0.3%	Rank history: #100 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
75	Souza Construction, Inc. Top agencies Navy (Department of the Navy)	$2,706,900	0.3%	Rank history: not on the FY2022–FY2023 lists, #28 in FY2024 and #30 in FY2025; down 9 since FY2020.
76	Yukon Fire Protection Services, Inc. Top agencies USAF (Department of the Air Force) SSA (Social Security Administration) GSA (General Services Administration)	$2,703,514	0.3%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 134 since FY2020.
77	Bundesministerium FUR Umwelt Naturschutz UND Reaktorsicherheit Through Bundesministerium FÜR Umwelt, Naturschutz UND Reaktorsicherheit Top agencies Army (Department of the Army)	$2,697,622	0.3%	Rank history: not on the FY2022–FY2025 lists; up 164 since FY2020.
78	Trane U.S. Inc. Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) USAF (Department of the Air Force)	$2,689,020	0.3%	Rank history: not on the FY2022–FY2025 lists; up 243 since FY2020.
79	Able Heating & Air Conditioning, Inc. Top agencies Navy (Department of the Navy)	$2,601,227	0.3%	Rank history: #6 in FY2022, #43 in FY2023, #16 in FY2024 and #34 in FY2025; up 9 since FY2020.
80	Southwestern Dakotah Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$2,559,480	0.3%	Rank history: #11 in FY2022 and not on the FY2023–FY2025 lists; down 74 since FY2020.
81	Astro Mechanical Contractors Inc. Top agencies Navy (Department of the Navy)	$2,545,715	0.3%	Rank history: #41 in FY2022, not on the FY2023 list, #15 in FY2024 and not on the FY2025 list; down 18 since FY2020.
82	OCS Construction Services Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) USDA (Department of Agriculture)	$2,543,471	0.3%	Rank history: not on the FY2022 list, #83 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
83	Green Earth Landworks LLC Top agencies USAF (Department of the Air Force)	$2,525,127	0.3%	Rank history: not on the FY2022–FY2025 lists; up 137 since FY2020.
84	E Corp Top agencies DOT (Department of Transportation)	$2,519,328	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Veterans Elite Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation) DOJ (Department of Justice)	$2,511,476	0.3%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
86	Mckinstry Co LLC Top agencies GSA (General Services Administration) DOI (Department of the Interior)	$2,480,742	0.3%	Rank history: not on the FY2022–FY2025 lists; up 43 since FY2020.
87	Universal Services Provider LLC Top agencies Navy (Department of the Navy) DODEA (Department of Defense Education Activity) NASA (National Aeronautics and Space Administration)	$2,448,912	0.3%	Rank history: not on the FY2022–FY2025 lists; down 28 since FY2020.
88	Duke Energy Corporation Through Piedmont Natural Gas Company, Inc. Top agencies Navy (Department of the Navy)	$2,443,014	0.3%	Rank history: #95 in FY2022, #98 in FY2023, not on the FY2024 list and #87 in FY2025; up 1 since FY2020.
89	Eacm Corp Top agencies DOT (Department of Transportation) Army (Department of the Army) DOI (Department of the Interior)	$2,400,451	0.3%	Rank history: not on the FY2022 list, #36 in FY2023 and not on the FY2024–FY2025 lists; up 198 since FY2020.
90	Office Design Solutions, Llc. Top agencies GSA (General Services Administration)	$2,400,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Bacik Group LLC Top agencies USAF (Department of the Air Force)	$2,282,012	0.3%	Rank history: not on the FY2022–FY2025 lists; down 44 since FY2020.
92	Tom Hammonds Enterprises, LLC Top agencies USAF (Department of the Air Force)	$2,228,732	0.3%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 125 since FY2020.
93	CM Construction Services, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$2,217,191	0.3%	Rank history: not on the FY2022 list, #60 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
94	Richard Group LLC Top agencies VA (Department of Veterans Affairs)	$2,205,862	0.3%	Rank history: not on the FY2022–FY2025 lists; down 77 since FY2020.
95	Jett's Specialty Contracting, LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$2,174,813	0.3%	Rank history: not on the FY2022 list, #16 in FY2023, #17 in FY2024 and #1 in FY2025; down 87 since FY2020.
96	Walter Mechanical Services Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DOT (Department of Transportation)	$2,170,304	0.3%	Rank history: not on the FY2022–FY2025 lists; down 17 since FY2020.
97	SES Electrical LLC Top agencies Army (Department of the Army)	$2,165,654	0.3%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
98	Control Technology & Solutions L.L.C. Top agencies Commerce (Department of Commerce)	$2,113,234	0.3%	Rank history: not on the FY2022–FY2025 lists; down 41 since FY2020.
99	J&B Hartigan, Inc. Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy)	$2,084,257	0.3%	Rank history: not on the FY2022–FY2025 lists; up 51 since FY2020.
100	Infinity-Cma JV, LLC Top agencies USAF (Department of the Air Force)	$2,066,549	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 1,961 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 23822

Code	Net obligations	Largest contractor
238220 Plumbing, Heating, and Air-Conditioning Contractors	$797,483,248	North State Mechanical Inc.

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 $833 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 23822 contractors in FY2021?

1. North State Mechanical Inc. ($27.7M), 2. Four Tribes Enterprises, LLC ($25.4M), 3. Afci-Cci JV One LLC ($24M), 4. Orcom, A Division of Ortega Companies, Inc. ($11M), 5. Qcm, Inc. ($9.25M), 6. Greenland Enterprises, Inc. ($9.21M), 7. The Ryan Group Inc ($8.68M), 8. Welch Construction Inc. ($8.56M), 9. The Whiting-Turner Contracting Company ($8.53M), 10. Koniag, Inc. ($7.7M).

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