Top 100 Contractors in NAICS 237: Heavy and Civil Engineering Construction, FY2021

Name: Top 100 Contractors in NAICS 237: Heavy and Civil Engineering Construction, FY2021
Creator: GovTribe

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

The top 10 won 21% of FY2021 NAICS 237 contract dollars

Contract obligations: $10,017,653,287 Net of deobligations, by contracts coded NAICS 237 or a code under it
Contractors: 2,661 Parent companies with an obligation
Largest contractor: Great Lakes Dredge & Dock Corporation $511 million, 4.9% 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	Great Lakes Dredge & Dock Corporation 2 awardees, including Forgen LLC Top agencies Army (Department of the Army)	$510,888,237	4.9%	Rank history: #5 in FY2022, #1 in FY2023, #4 in FY2024 and #6 in FY2025; up 4 since FY2020.
2	Alberici-Mortenson A Joint Venture Top agencies Navy (Department of the Navy)	$369,949,779	3.5%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
3	Webuild S.p.A. Through The Lane Construction Corporation Top agencies Army (Department of the Army)	$219,026,187	2.1%	Rank history: #3 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
4	Peter Kiewit Sons', Inc. 6 awardees, including Kiewit Infrastructure South Co, Kiewit Infrastructure Co. and Kiewit Infrastructure West Co. Top agencies Army (Department of the Army) DOI (Department of the Interior) Navy (Department of the Navy)	$216,021,459	2.1%	Rank history: #16 in FY2022, #5 in FY2023, #3 in FY2024 and #2 in FY2025; up 14 since FY2020.
5	Weeks Marine Inc. 3 awardees, including Healy Tibbitts Builders, Inc. Top agencies Commerce (Department of Commerce) Army (Department of the Army) USDA (Department of Agriculture)	$199,451,860	1.9%	Rank history: #17 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
6	Thalle Construction Co Inc. Top agencies Army (Department of the Army)	$167,255,582	1.6%	Rank history: #8 in FY2022 and not on the FY2023–FY2025 lists; up 358 since FY2020.
7	The Dutra Group Top agencies Army (Department of the Army) Navy (Department of the Navy)	$152,165,496	1.4%	Rank history: #48 in FY2022, #10 in FY2023, #21 in FY2024 and #40 in FY2025; up 20 since FY2020.
8	Manson Construction Co. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$151,765,064	1.4%	Rank history: #6 in FY2022, #4 in FY2023, #7 in FY2024 and #7 in FY2025; down 1 since FY2020.
9	Maloney-Odin JV Top agencies Army (Department of the Army)	$132,210,128	1.3%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; up 26 since FY2020.
10	Kokosing Construction Company Inc. 4 awardees, including Construction Co Corman Kokosing, Kokosing Alberici, LLC and Kokosing Industrial Inc. Top agencies DOT (Department of Transportation) Army (Department of the Army)	$124,939,921	1.2%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
11	Tutor Perini Corporation Through Black Construction Corporation Top agencies Navy (Department of the Navy)	$124,511,602	1.2%	Rank history: #27 in FY2022 and not on the FY2023–FY2025 lists; up 352 since FY2020.
12	Andritz AG Through Andritz Hydro Corp Top agencies Army (Department of the Army) DOI (Department of the Interior)	$106,310,760	1.0%	Rank history: not on the FY2022 list, #23 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
13	J.e. Mcamis, Inc. Top agencies Army (Department of the Army)	$98,174,105	0.9%	Rank history: #44 in FY2022, not on the FY2023 list, #81 in FY2024 and not on the FY2025 list; up 26 since FY2020.
14	H2O Guam JV Top agencies Navy (Department of the Navy)	$97,995,000	0.9%	Rank history: not on the FY2022 list, #16 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
15	Garco Construction, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOI (Department of the Interior)	$93,725,866	0.9%	Rank history: not on the FY2022–FY2023 lists, #36 in FY2024 and #98 in FY2025; up 97 since FY2020.
16	Continental Heavy Civil Corp Top agencies Army (Department of the Army) DOI (Department of the Interior)	$84,113,736	0.8%	Rank history: not on the FY2022–FY2025 lists; up 85 since FY2020.
17	Norfolk Dredging Company Top agencies Army (Department of the Army) Navy (Department of the Navy)	$84,042,269	0.8%	Rank history: #14 in FY2022, #17 in FY2023, #35 in FY2024 and #19 in FY2025; up 68 since FY2020.
18	RC Construction Co & Millstone Weber A Joint Venture Top agencies Army (Department of the Army)	$81,554,847	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	Phylway Construction, L.l.c Top agencies Army (Department of the Army)	$79,645,687	0.8%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
20	Donjon Marine Co., LLC Top agencies Army (Department of the Army)	$79,217,663	0.8%	Rank history: #30 in FY2022, #33 in FY2023, #46 in FY2024 and #33 in FY2025; up 36 since FY2020.
21	Southwest Valley Constructors Co Top agencies Army (Department of the Army)	$78,403,491	0.7%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
22	Luhr Bros., Inc. Top agencies Army (Department of the Army)	$75,486,315	0.7%	Rank history: #45 in FY2022 and not on the FY2023–FY2025 lists; up 19 since FY2020.
23	Ahtna-Great Lakes E&I JV Top agencies Army (Department of the Army)	$74,719,112	0.7%	Rank history: #70 in FY2022, not on the FY2023–FY2024 lists and #63 in FY2025; new, not ranked in FY2020.
24	Rigid Constructors LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$74,666,701	0.7%	Rank history: not on the FY2022–FY2024 lists and #85 in FY2025; up 47 since FY2020.
25	The Cianbro Companies Through Cianbro Corporation Top agencies Navy (Department of the Navy)	$73,497,393	0.7%	Rank history: #32 in FY2022, #19 in FY2023, #24 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
26	Phillips Heavy, Inc. Top agencies Army (Department of the Army)	$72,683,248	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
27	Medvolt Construction Services, LLC Top agencies Army (Department of the Army)	$70,738,111	0.7%	Rank history: not on the FY2022–FY2025 lists; up 323 since FY2020.
28	Encore Dredging Founding Partners LLC Through Inland Dredging Company, L.L.C. Top agencies Army (Department of the Army)	$70,252,842	0.7%	Rank history: #46 in FY2022, #34 in FY2023, #40 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
29	381 Constructors Top agencies Navy (Department of the Navy)	$70,000,000	0.7%	Rank history: #2 in FY2022, #3 in FY2023, #5 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
30	Estes Bros. Const. Inc. Top agencies DOT (Department of Transportation) DOI (Department of the Interior) DOJ (Department of Justice)	$69,643,077	0.7%	Rank history: #59 in FY2022, #82 in FY2023, #45 in FY2024 and #61 in FY2025; up 122 since FY2020.
31	Camp Dresser & Mckee Inc. 4 awardees, including CDM Constructors Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) Navy (Department of the Navy)	$67,184,720	0.6%	Rank history: not on the FY2022–FY2025 lists; up 463 since FY2020.
32	Industrial Builders Inc. Top agencies Army (Department of the Army)	$67,115,891	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	C.j. Mahan Construction Company, LLC Top agencies Army (Department of the Army)	$66,422,633	0.6%	Rank history: not on the FY2022–FY2023 lists, #54 in FY2024 and #43 in FY2025; up 26 since FY2020.
34	B & K Construction Co L.l.c Top agencies Army (Department of the Army)	$64,862,312	0.6%	Rank history: not on the FY2022 list, #24 in FY2023 and not on the FY2024–FY2025 lists; up 52 since FY2020.
35	Randy Kinder Excavating Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation) Army (Department of the Army)	$53,248,610	0.5%	Rank history: not on the FY2022–FY2025 lists; down 25 since FY2020.
36	J.f. Brennan Company, Inc. Top agencies Army (Department of the Army)	$52,502,384	0.5%	Rank history: #83 in FY2022, not on the FY2023 list, #29 in FY2024 and #74 in FY2025; up 120 since FY2020.
37	Sauer Holdings Inc. Through Sauer Construction, LLC Top agencies Navy (Department of the Navy)	$52,339,456	0.5%	Rank history: #95 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
38	Cook Inlet Region Inc. 4 awardees, including North Wind Construction Services, LLC and Silver Mountain Construction, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) USAF (Department of the Air Force)	$51,139,355	0.5%	Rank history: not on the FY2022–FY2025 lists; up 64 since FY2020.
39	Bauer AG Through Bauer Foundation Corp Top agencies Army (Department of the Army)	$47,073,436	0.4%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
40	Reyes Construction, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$47,065,192	0.4%	Rank history: #36 in FY2022, not on the FY2023 list, #27 in FY2024 and #99 in FY2025; down 23 since FY2020.
41	B.l. Harbert Holdings, L.L.C. Through BL Harbert International LLC Top agencies Army (Department of the Army)	$46,523,258	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	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	0.4%	Rank history: #93 in FY2022, not on the FY2023 list, #16 in FY2024 and not on the FY2025 list; up 35 since FY2020.
43	Dubuque Barge and Fleeting Service Co Top agencies Army (Department of the Army)	$45,940,581	0.4%	Rank history: not on the FY2022–FY2024 lists and #82 in FY2025; up 33 since FY2020.
44	Synergy Electric Company, Inc. Top agencies Navy (Department of the Navy)	$45,434,630	0.4%	Rank history: not on the FY2022–FY2023 lists, #43 in FY2024 and not on the FY2025 list; up 243 since FY2020.
45	AECOM 3 awardees, including Shimmick Construction Company, Inc. and AECOM Construction, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$44,965,265	0.4%	Rank history: #65 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; down 26 since FY2020.
46	Wood Environment & Infrastructure Solutions Inc. 3 awardees, including WSP USA Environment & Infrastructure Inc. and C E C Controls Co, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) EPA (Environmental Protection Agency)	$44,537,312	0.4%	Rank history: not on the FY2022 list, #77 in FY2023 and not on the FY2024–FY2025 lists; up 171 since FY2020.
47	Orion Marine Group Inc. 2 awardees, including Orion Marine Construction, Inc. and Orion Marine Contractors, Inc. Top agencies Army (Department of the Army) DOT (Department of Transportation)	$43,820,738	0.4%	Rank history: #41 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
48	Penta-Ocean Construction Co., Ltd. Top agencies Navy (Department of the Navy)	$40,325,769	0.4%	Rank history: not on the FY2022–FY2025 lists; down 23 since FY2020.
49	Mike Hooks, LLC Top agencies Army (Department of the Army)	$39,459,563	0.4%	Rank history: #25 in FY2022, #66 in FY2023, #64 in FY2024 and #47 in FY2025; down 18 since FY2020.
50	Tech2 Solutions Top agencies DOE (Department of Energy)	$38,976,562	0.4%	Rank history: not on the FY2022–FY2025 lists; up 63 since FY2020.
51	American Civil Constructors LLC Top agencies DOT (Department of Transportation)	$38,335,132	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
52	Reliable Contracting Group, LLC Top agencies DLA (Defense Logistics Agency)	$37,515,155	0.4%	Rank history: not on the FY2022 list, #75 in FY2023, #70 in FY2024 and #35 in FY2025; up 126 since FY2020.
53	Midwest Construction Co Top agencies Army (Department of the Army)	$36,203,604	0.3%	Rank history: #56 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
54	H & L Contracting LLC Top agencies Army (Department of the Army)	$35,048,706	0.3%	Rank history: not on the FY2022–FY2024 lists and #77 in FY2025; down 34 since FY2020.
55	Aptim Federal Services LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$34,228,268	0.3%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
56	Crosby Dredging LLC Top agencies Army (Department of the Army)	$33,896,230	0.3%	Rank history: not on the FY2022 list, #73 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
57	Nordic Industries Inc. Top agencies Army (Department of the Army)	$33,739,802	0.3%	Rank history: #71 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
58	ESI Contracting, Corp. Top agencies Army (Department of the Army)	$32,817,188	0.3%	Rank history: not on the FY2022–FY2025 lists; up 113 since FY2020.
59	Cashman Dredging and Marine Contracting Co. LLC Top agencies Army (Department of the Army)	$32,698,578	0.3%	Rank history: #57 in FY2022, #59 in FY2023, #93 in FY2024 and not on the FY2025 list; up 77 since FY2020.
60	Morrish-Wallace Construction, Inc. Top agencies Army (Department of the Army)	$32,328,167	0.3%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
61	Decatur Construction, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$31,992,161	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Winnebago Tribe of Nebraska Through HCI Management Services Company Top agencies DOS (Department of State)	$31,925,000	0.3%	Rank history: not on the FY2022 list, #85 in FY2023 and not on the FY2024–FY2025 lists; up 26 since FY2020.
63	CJW Joint Venture Top agencies Army (Department of the Army)	$31,478,086	0.3%	Rank history: not on the FY2022–FY2025 lists; down 41 since FY2020.
64	C.A.R.P.I. U.S.a. Inc. Top agencies DOI (Department of the Interior)	$31,247,964	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	SGC Services 2, LLC Top agencies VA (Department of Veterans Affairs)	$29,948,100	0.3%	Rank history: not on the FY2022 list, #57 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
66	C J W Construction, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$29,910,345	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Bristol Prime Contractors, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$29,643,333	0.3%	Rank history: not on the FY2022–FY2025 lists; up 167 since FY2020.
68	Etcon Inc. Top agencies Army (Department of the Army)	$29,600,457	0.3%	Rank history: not on the FY2022–FY2025 lists; up 94 since FY2020.
69	Apogee Group, LLC Top agencies DOE (Department of Energy)	$28,525,161	0.3%	Rank history: not on the FY2022 list, #62 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
70	Reliable Builders Inc. Top agencies Navy (Department of the Navy)	$28,493,112	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Pine Bluff Sand and Gravel Company Top agencies Army (Department of the Army)	$28,356,854	0.3%	Rank history: #78 in FY2022, not on the FY2023 list, #59 in FY2024 and #45 in FY2025; down 14 since FY2020.
72	R.c. Construction Co., Inc. Top agencies USSOCOM (United States Special Operations Command) Army (Department of the Army)	$28,218,014	0.3%	Rank history: not on the FY2022–FY2023 lists, #17 in FY2024 and not on the FY2025 list; down 7 since FY2020.
73	Flatiron-Dragados-Sukut Joint Venture Top agencies Army (Department of the Army)	$26,950,387	0.3%	Rank history: not on the FY2022 list, #91 in FY2023 and not on the FY2024–FY2025 lists; up 244 since FY2020.
74	Ahtna, Incorporated 6 awardees, including Ahtna Construction & Primary Products Company, LLC, Ahtna Global LLC and Ahtna Environmental, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior) USAF (Department of the Air Force)	$26,864,014	0.3%	Rank history: not on the FY2022–FY2025 lists; up 100 since FY2020.
75	Power Pro Plus Inc. Top agencies Navy (Department of the Navy)	$26,099,117	0.2%	Rank history: not on the FY2022–FY2025 lists; up 64 since FY2020.
76	Granite Construction Incorporated 3 awardees, including Intermountain Slurry Seal, Inc. and Granite Construction Company Guam Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) Army (Department of the Army)	$25,983,047	0.2%	Rank history: #35 in FY2022 and not on the FY2023–FY2025 lists; up 130 since FY2020.
77	Granite-Obayashi A Joint Venture Top agencies Navy (Department of the Navy)	$25,972,393	0.2%	Rank history: not on the FY2022–FY2025 lists; down 39 since FY2020.
78	Eastman Aggregate Enterprises LLC Top agencies Army (Department of the Army)	$25,705,184	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	The Walsh Group 4 awardees, including Archer Western Construction, LLC, Walsh Construction Company II, LLC and Archer Western Federal JV Top agencies DOI (Department of the Interior) Navy (Department of the Navy) Army (Department of the Army)	$25,400,245	0.2%	Rank history: #22 in FY2022, #27 in FY2023 and not on the FY2024–FY2025 lists; down 66 since FY2020.
80	Cottrell Contracting Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$25,278,082	0.2%	Rank history: #68 in FY2022, #72 in FY2023, #44 in FY2024 and #41 in FY2025; up 27 since FY2020.
81	Empire Equipment Service, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$25,236,872	0.2%	Rank history: not on the FY2022–FY2024 lists and #54 in FY2025; new, not ranked in FY2020.
82	E S Wagner Co Top agencies DOI (Department of the Interior)	$24,964,290	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Port of Portland Top agencies Army (Department of the Army)	$24,949,817	0.2%	Rank history: not on the FY2022–FY2025 lists; up 102 since FY2020.
84	Global Urban Enterprises, L.L.C. Top agencies VA (Department of Veterans Affairs)	$24,601,404	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	General Electric Company 2 awardees, including GE Renewables US LLC and Alstom Power Inc. Top agencies Army (Department of the Army)	$23,495,221	0.2%	Rank history: not on the FY2022 list, #67 in FY2023, #50 in FY2024 and #32 in FY2025; up 30 since FY2020.
86	Island Roads Corporation Top agencies DOT (Department of Transportation)	$23,423,772	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Marinex Construction Inc. Top agencies Army (Department of the Army)	$23,359,693	0.2%	Rank history: #80 in FY2022, #41 in FY2023, #87 in FY2024 and not on the FY2025 list; down 57 since FY2020.
88	Natives of Kodiak, Incorporated 3 awardees, including Koman Construction, LLC, Stormwater Plans, LLC and Koman Government Solutions LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Army (Department of the Army)	$22,926,755	0.2%	Rank history: not on the FY2022–FY2025 lists; up 58 since FY2020.
89	Bis Services LLC Top agencies Army (Department of the Army)	$22,756,142	0.2%	Rank history: not on the FY2022–FY2025 lists; up 94 since FY2020.
90	Wiregrass Construction Company Inc 2 awardees, including C.w. Roberts Contracting, Incorporated Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$22,700,898	0.2%	Rank history: not on the FY2022–FY2025 lists; up 101 since FY2020.
91	Southern Contracting, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$22,525,537	0.2%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 35 since FY2020.
92	Bering Straits Native Corporation 4 awardees, including Stampede Ventures Inc., Eagle Eye Electric LLC and Bering Straits Development Co. Top agencies WHS (DOD Washington Headquarters Service) Army (Department of the Army) EPA (Environmental Protection Agency)	$22,494,713	0.2%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; up 27 since FY2020.
93	Martin Brothers Construction Top agencies DOI (Department of the Interior) Army (Department of the Army) Navy (Department of the Navy)	$21,996,059	0.2%	Rank history: not on the FY2022–FY2023 lists, #98 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
94	Ames Construction, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$21,607,562	0.2%	Rank history: #18 in FY2022 and not on the FY2023–FY2025 lists; down 71 since FY2020.
95	Nova Group Inc. 2 awardees, including Service Electric Company Top agencies Army (Department of the Army) Navy (Department of the Navy) DOJ (Department of Justice)	$21,582,100	0.2%	Rank history: #51 in FY2022, #42 in FY2023, #86 in FY2024 and not on the FY2025 list; down 62 since FY2020.
96	Gana-A' Yoo, Limited 2 awardees, including Kaiyuh Services, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$21,154,045	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Southland Holdings LLC 2 awardees, including Oscar Renda Contracting Inc. Top agencies DOI (Department of the Interior)	$20,404,753	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Bodell Construction Company Top agencies USAF (Department of the Air Force)	$20,338,800	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	G.M. Johnson Companies Inc. Through Occi Inc. Top agencies Army (Department of the Army)	$20,319,052	0.2%	Rank history: not on the FY2022–FY2023 lists, #68 in FY2024 and not on the FY2025 list; up 364 since FY2020.
100	WHH Nisqually-Garco JV 2 Top agencies DLA (Defense Logistics Agency)	$20,124,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 2,661 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 237

Code	Net obligations	Largest contractor
2379 Other Heavy and Civil Engineering Construction	$6,670,012,171	Great Lakes Dredge & Dock Corporation
2373 Highway, Street, and Bridge Construction	$1,880,049,353	Kokosing Construction Company Inc.
2371 Utility System Construction	$1,467,117,335	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 $10.5 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 237 contractors in FY2021?

1. Great Lakes Dredge & Dock Corporation ($511M), 2. Alberici-Mortenson A Joint Venture ($370M), 3. Webuild S.p.A. ($219M), 4. Peter Kiewit Sons', Inc. ($216M), 5. Weeks Marine Inc. ($199M), 6. Thalle Construction Co Inc. ($167M), 7. The Dutra Group ($152M), 8. Manson Construction Co. ($152M), 9. Maloney-Odin JV ($132M), 10. Kokosing Construction Company Inc. ($125M).

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