Top 100 Contractors in NAICS 23712: Oil and Gas Pipeline and Related Structures Construction, FY2021

Name: Top 100 Contractors in NAICS 23712: Oil and Gas Pipeline and Related Structures Construction, FY2021
Creator: GovTribe

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

The top 10 won 67% of FY2021 NAICS 23712 contract dollars

Contract obligations: $485,473,367 Net of deobligations, by contracts coded NAICS 23712 or a code under it
Contractors: 124 Parent companies with an obligation
Largest contractor: Garco Construction, Inc. $74.1 million, 15.1% 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	Garco Construction, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$74,071,044	15.1%	Rank history: #49 in FY2022, #46 in FY2023, #4 in FY2024 and #40 in FY2025; up 60 since FY2020.
2	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$46,509,473	9.5%	Rank history: #5 in FY2022, #12 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
3	Wood Environment & Infrastructure Solutions Inc. Through WSP USA Environment & Infrastructure Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$44,360,730	9.0%	Rank history: #9 in FY2022, #6 in FY2023, #78 in FY2024 and not on the FY2025 list; up 7 since FY2020.
4	Reliable Contracting Group, LLC Top agencies DLA (Defense Logistics Agency)	$37,515,155	7.7%	Rank history: #7 in FY2022, #5 in FY2023, #8 in FY2024 and #2 in FY2025; up 4 since FY2020.
5	Aptim Federal Services LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$34,228,268	7.0%	Rank history: not on the FY2022 list, #2 in FY2023, #7 in FY2024 and not on the FY2025 list; down 4 since FY2020.
6	Bodell Construction Company Top agencies USAF (Department of the Air Force)	$20,338,800	4.1%	Rank history: #68 in FY2022, #30 in FY2023, #95 in FY2024 and #95 in FY2025; up 58 since FY2020.
7	WHH Nisqually-Garco JV 2 Top agencies DLA (Defense Logistics Agency)	$20,124,000	4.1%	Rank history: not on the FY2022 list, #78 in FY2023, not on the FY2024 list and #61 in FY2025; new, not ranked in FY2020.
8	Ross Group Construction Corporation, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$19,881,164	4.1%	Rank history: #17 in FY2022, #68 in FY2023, not on the FY2024 list and #25 in FY2025; up 13 since FY2020.
9	Structural Associates Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$15,924,884	3.2%	Rank history: #4 in FY2022, #24 in FY2023, #22 in FY2024 and #18 in FY2025; up 3 since FY2020.
10	Nova Group Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$14,978,101	3.1%	Rank history: #3 in FY2022, #4 in FY2023, #24 in FY2024 and not on the FY2025 list; down 7 since FY2020.
11	Pond Constructors Inc. Top agencies Navy (Department of the Navy)	$12,257,350	2.5%	Rank history: #14 in FY2022, #32 in FY2023, #37 in FY2024 and #19 in FY2025; up 21 since FY2020.
12	Cape-Burns & Mcdonnell JV Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$11,980,075	2.4%	Rank history: #15 in FY2022, #10 in FY2023, #27 in FY2024 and not on the FY2025 list; down 8 since FY2020.
13	Dawson Enterprises, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Army (Department of the Army)	$11,870,027	2.4%	Rank history: #8 in FY2022, #9 in FY2023, #16 in FY2024 and #5 in FY2025; up 21 since FY2020.
14	Bristol Bay Native Corporation Through Bristol Engineering Services Company, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$11,415,103	2.3%	Rank history: #27 in FY2022, #13 in FY2023, #11 in FY2024 and #11 in FY2025; down 9 since FY2020.
15	Tempest Enterprises Inc. Top agencies Army (Department of the Army)	$10,973,698	2.2%	Rank history: not on the FY2022 list, #48 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
16	Kinley Construction Company Top agencies DLA (Defense Logistics Agency)	$10,426,868	2.1%	Rank history: #36 in FY2022, #36 in FY2023, #15 in FY2024 and #46 in FY2025; down 2 since FY2020.
17	Goshawk, LLC Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$9,286,785	1.9%	Rank history: #11 in FY2022, #17 in FY2023, #9 in FY2024 and #17 in FY2025; down 8 since FY2020.
18	Kear Civil Corp Top agencies DLA (Defense Logistics Agency)	$7,137,751	1.5%	Rank history: #43 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
19	Weston Solutions Inc. 2 awardees Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$6,806,611	1.4%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; up 27 since FY2020.
20	Eklutna Construction & Maintenance, LLC Top agencies Army (Department of the Army)	$6,467,361	1.3%	Rank history: #35 in FY2022, #45 in FY2023, not on the FY2024 list and #37 in FY2025; new, not ranked in FY2020.
21	Ukpeagvik Inupiat Corpor Through Rockford Corporation Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$5,305,267	1.1%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
22	Aaecon General Contracting LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$4,730,127	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	Ahtna, Incorporated 2 awardees, including Ahtna Global LLC and Ahtna Environmental, Inc. Top agencies Army (Department of the Army)	$4,553,677	0.9%	Rank history: #51 in FY2022, not on the FY2023 list, #83 in FY2024 and not on the FY2025 list; down 3 since FY2020.
24	Native Hawaiian Community Development Corporation 2 awardees, including GSI Pacific Inc. and GSI North America Inc. Top agencies DLA (Defense Logistics Agency)	$4,149,654	0.8%	Rank history: #28 in FY2022, #28 in FY2023, #68 in FY2024 and not on the FY2025 list; down 7 since FY2020.
25	D7, LLC Top agencies DLA (Defense Logistics Agency)	$3,350,300	0.7%	Rank history: #18 in FY2022, not on the FY2023 list, #30 in FY2024 and #52 in FY2025; new, not ranked in FY2020.
26	Cook Inlet Region Inc. Through Silver Mountain Construction, LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$2,685,795	0.5%	Rank history: #53 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
27	Himalayan Builders and Engineers Pvt. Ltd Top agencies Navy (Department of the Navy)	$2,458,824	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Red Point Construction, LLC Top agencies Army (Department of the Army)	$2,444,888	0.5%	Rank history: #30 in FY2022, not on the FY2023 list, #52 in FY2024 and #16 in FY2025; new, not ranked in FY2020.
29	Nova Nacap A Joint Venture Top agencies Navy (Department of the Navy)	$2,109,985	0.4%	Rank history: #1 in FY2022, #71 in FY2023, #39 in FY2024 and #76 in FY2025; up 43 since FY2020.
30	Dawson-Pond JV LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,985,453	0.4%	Rank history: #50 in FY2022, #42 in FY2023, #61 in FY2024 and not on the FY2025 list; down 19 since FY2020.
31	Rore, Inc. Top agencies DLA (Defense Logistics Agency)	$1,811,889	0.4%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; down 18 since FY2020.
32	Sai-Talon Joint Venture Top agencies Army (Department of the Army)	$1,800,025	0.4%	Rank history: not on the FY2022–FY2025 lists; up 42 since FY2020.
33	Bairco Construction Inc. Top agencies DOI (Department of the Interior)	$1,750,456	0.4%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
34	Raymond-Pond Solutions 8A JV, LLC Top agencies DLA (Defense Logistics Agency)	$1,649,980	0.3%	Rank history: #55 in FY2022 and not on the FY2023–FY2025 lists; up 19 since FY2020.
35	AQ Global for General Trading & Contracting Co. W.L.L. Top agencies USAF (Department of the Air Force)	$1,157,523	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Nomlaki Technologies, LLC Top agencies DLA (Defense Logistics Agency)	$1,124,293	0.2%	Rank history: not on the FY2022 list, #26 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
37	G2I LLC Top agencies Army (Department of the Army)	$952,276	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	MEB General Contractors Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$937,137	0.2%	Rank history: #6 in FY2022, #43 in FY2023, #10 in FY2024 and #8 in FY2025; down 7 since FY2020.
39	Itsi Gilbane Japan G.K. Through Gilbane Federal Top agencies DLA (Defense Logistics Agency)	$884,138	0.2%	Rank history: #24 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
40	Granite Petroleum Inc. Top agencies USAF (Department of the Air Force)	$837,602	0.2%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
41	Prime One Group General Trading and Contracting Company WLL Top agencies USAF (Department of the Air Force)	$826,658	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	KNK Engineering Consulting Corp. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$716,288	0.1%	Rank history: #13 in FY2022, #23 in FY2023, #34 in FY2024 and #15 in FY2025; up 62 since FY2020.
43	Unified Contractor, Inc. Top agencies Army (Department of the Army)	$577,613	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	Core Engineered Solutions Inc. Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) DHS (Department of Homeland Security)	$541,200	0.1%	Rank history: #47 in FY2022, not on the FY2023 list, #77 in FY2024 and #88 in FY2025; new, not ranked in FY2020.
45	ATI Wood-Solesi Top agencies Navy (Department of the Navy)	$531,547	0.1%	Rank history: #37 in FY2022, #55 in FY2023, #70 in FY2024 and #54 in FY2025; up 2 since FY2020.
46	Gsi-Pond JV LLC Top agencies DLA (Defense Logistics Agency)	$498,287	0.1%	Rank history: #32 in FY2022, #11 in FY2023, #5 in FY2024 and #10 in FY2025; up 75 since FY2020.
47	Bristol Site Contractors, LLC Top agencies DLA (Defense Logistics Agency)	$464,308	0.1%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; down 12 since FY2020.
48	Gideon Contracting Limited Liability Company Merkezi ABD Turkiye Subesi Top agencies DLA (Defense Logistics Agency)	$438,450	0.1%	Rank history: #20 in FY2022, not on the FY2023 list, #57 in FY2024 and not on the FY2025 list; down 25 since FY2020.
49	Flagstone Roofing & Exteriors LLC Top agencies USAF (Department of the Air Force)	$409,005	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	S.j. Smith Co., Inc. Top agencies Army (Department of the Army)	$408,548	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	City of Corpus Christi Top agencies Navy (Department of the Navy)	$396,856	0.1%	Rank history: not on the FY2022 list, #53 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
52	Utility Energy Systems, LLC Top agencies DOJ (Department of Justice) USAF (Department of the Air Force)	$395,895	0.1%	Rank history: #59 in FY2022, #35 in FY2023, #63 in FY2024 and #42 in FY2025; new, not ranked in FY2020.
53	Tepa Construction Solutions, LLC Top agencies DLA (Defense Logistics Agency)	$376,706	0.1%	Rank history: not on the FY2022 list, #19 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
54	Rockford Corporation Top agencies DLA (Defense Logistics Agency)	$338,857	0.1%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
55	Cgrs Inc. Top agencies DOI (Department of the Interior)	$333,723	0.1%	Rank history: not on the FY2022 list, #50 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
56	SES Energy Services LLC Top agencies Army (Department of the Army)	$310,343	0.1%	Rank history: #12 in FY2022, #14 in FY2023, #21 in FY2024 and #47 in FY2025; down 29 since FY2020.
57	Daebo Industrial Co. Ltd. Through Daebo Engineering & Construction Co., Ltd. Top agencies Army (Department of the Army)	$307,342	0.1%	Rank history: #52 in FY2022, #52 in FY2023, #86 in FY2024 and not on the FY2025 list; down 2 since FY2020.
58	Messer Construction Co Top agencies Army (Department of the Army)	$296,478	0.1%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; down 51 since FY2020.
59	Eagle Eye - Enviroworks Joint Venture, LLC Top agencies DLA (Defense Logistics Agency)	$272,646	0.1%	Rank history: not on the FY2022–FY2025 lists; up 64 since FY2020.
60	S & B Engineers and Constructors Inc Through S & B Infrastructure Ltd Top agencies DLA (Defense Logistics Agency)	$249,863	0.1%	Rank history: #89 in FY2022, not on the FY2023 list, #72 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
61	Ajce Corporation Top agencies DOI (Department of the Interior)	$249,000	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
62	Silver Mountain Construction, LLC Top agencies Army (Department of the Army)	$238,362	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Gideon Contracting, Limited Liability Company Top agencies DLA (Defense Logistics Agency)	$226,276	<0.1%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; down 47 since FY2020.
64	Korea Inspection System Corporation Top agencies Army (Department of the Army)	$206,982	<0.1%	Rank history: #62 in FY2022, #65 in FY2023, #75 in FY2024 and not on the FY2025 list; down 1 since FY2020.
65	MMI Tank & Industrial Services, Inc. Top agencies USDA (Department of Agriculture)	$203,401	<0.1%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
66	CTI Companies, LLC Top agencies Army (Department of the Army)	$193,737	<0.1%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
67	Energy EPC Solutions, LLC Top agencies DOI (Department of the Interior)	$187,574	<0.1%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
68	Peter Spieleder GMBH Top agencies Army (Department of the Army)	$185,381	<0.1%	Rank history: #84 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; up 20 since FY2020.
69	Red Heritage Media LLC Top agencies USAF (Department of the Air Force)	$184,512	<0.1%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
70	Precision Tanks Inc. Top agencies GSA (General Services Administration)	$175,794	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 42 since FY2020.
71	Davko Services, LLC Top agencies VA (Department of Veterans Affairs)	$168,200	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Kumsung Construction Co., Ltd. Top agencies Army (Department of the Army)	$159,747	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
73	CI Pond Solutions JV LLC Top agencies DLA (Defense Logistics Agency)	$153,327	<0.1%	Rank history: #48 in FY2022, not on the FY2023–FY2024 lists and #23 in FY2025; down 31 since FY2020.
74	Renova Environmental Company Top agencies DHS (Department of Homeland Security)	$150,832	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 25 since FY2020.
75	Mass Tank Inspection Services LLC Top agencies Navy (Department of the Navy)	$144,900	<0.1%	Rank history: #57 in FY2022, #47 in FY2023, #60 in FY2024 and #51 in FY2025; down 23 since FY2020.
76	Boston Green Fuel Co., LLC Top agencies Army (Department of the Army)	$139,880	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	UST General Contracting LLC Top agencies Army (Department of the Army)	$131,189	<0.1%	Rank history: not on the FY2022 list, #61 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
78	Independence Constructors Inc. Top agencies VA (Department of Veterans Affairs)	$122,050	<0.1%	Rank history: #65 in FY2022, #72 in FY2023, #62 in FY2024 and #67 in FY2025; new, not ranked in FY2020.
79	WSP USA Environment & Infrastructure Inc. Top agencies DLA (Defense Logistics Agency)	$108,621	<0.1%	Rank history: not on the FY2022–FY2023 lists, #6 in FY2024 and #4 in FY2025; new, not ranked in FY2020.
80	A & P Remodeling Co Inc. Top agencies Army (Department of the Army)	$106,285	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Mike Hoffmans Equipment Service Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$90,653	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Petroc S.A. Top agencies DOS (Department of State)	$89,580	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	UD Contracting Inc. Top agencies Army (Department of the Army)	$83,222	<0.1%	Rank history: #73 in FY2022, #69 in FY2023, not on the FY2024 list and #71 in FY2025; up 1 since FY2020.
84	Hydro-Environmental Technologies, Inc. Top agencies HHS (Department of Health and Human Services)	$81,887	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Fuel Specialists Hawaii LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$80,684	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Midwest Electro TECH Corp Top agencies VA (Department of Veterans Affairs)	$80,324	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
87	Architectural House Est. for Contracting Top agencies USAF (Department of the Air Force)	$79,948	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Imperial Construction & Electric Inc. Top agencies VA (Department of Veterans Affairs)	$72,432	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 50 since FY2020.
89	Petro West Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$71,539	<0.1%	Rank history: #66 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
90	Acton Contracting LLC Top agencies DOJ (Department of Justice)	$67,323	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Fabco Welding & Machine, Inc. Top agencies DOT (Department of Transportation)	$60,420	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Excel Equipment & Supply Co Inc. Top agencies DOT (Department of Transportation)	$38,402	<0.1%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
93	Vetcon Services LLC Top agencies VA (Department of Veterans Affairs)	$37,592	<0.1%	Rank history: #91 in FY2022, #89 in FY2023, not on the FY2024 list and #87 in FY2025; up 8 since FY2020.
94	Ruprecht Construction Inc. Top agencies USAF (Department of the Air Force)	$35,818	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
95	Tfs-Aptim JV LLC Top agencies Navy (Department of the Navy)	$29,802	<0.1%	Rank history: not on the FY2022 list, #29 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
96	Mascott Equipment Company, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$29,650	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
97	Multiforce Systems Corp Top agencies DOI (Department of the Interior) VA (Department of Veterans Affairs)	$27,659	<0.1%	Rank history: #83 in FY2022, #73 in FY2023, #98 in FY2024 and #90 in FY2025; down 43 since FY2020.
98	Waldrop Construction Inc. Top agencies DLA (Defense Logistics Agency)	$26,330	<0.1%	Rank history: #21 in FY2022, not on the FY2023 list, #65 in FY2024 and not on the FY2025 list; down 76 since FY2020.
99	USA Environmental Management, Inc. Top agencies Army (Department of the Army)	$24,700	<0.1%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; down 71 since FY2020.
100	Kubat Equipment & Service Co., LLC Top agencies DOI (Department of the Interior)	$24,408	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 124 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 23712

Code	Net obligations	Largest contractor
237120 Oil and Gas Pipeline and Related Structures Construction	$485,473,367	Garco Construction, 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 $490 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 23712 contractors in FY2021?

1. Garco Construction, Inc. ($74.1M), 2. Weston Solutions Holdings, Inc. ($46.5M), 3. Wood Environment & Infrastructure Solutions Inc. ($44.4M), 4. Reliable Contracting Group, LLC ($37.5M), 5. Aptim Federal Services LLC ($34.2M), 6. Bodell Construction Company ($20.3M), 7. WHH Nisqually-Garco JV 2 ($20.1M), 8. Ross Group Construction Corporation, LLC ($19.9M), 9. Structural Associates Inc. ($15.9M), 10. Nova Group Inc. ($15M).

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