Top 100 Contractors in NAICS 237: Heavy and Civil Engineering Construction, FY2024

Name: Top 100 Contractors in NAICS 237: Heavy and Civil Engineering Construction, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 31% of FY2024 NAICS 237 contract dollars

Contract obligations: $15,448,252,533 Net of deobligations, by contracts coded NAICS 237 or a code under it
Contractors: 2,538 Parent companies with an obligation
Largest contractor: Dragados / Hawaiian Dredging / Orion JV $791 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	Dragados / Hawaiian Dredging / Orion JV Top agencies Navy (Department of the Navy)	$790,689,582	4.9%	Rank history: not on the FY2021–FY2022 lists, #2 in FY2023 and #1 in FY2025; up 1 since FY2023.
2	Trumbull Corporation and Brayman Construction Corporation, A Joint Venture Top agencies Army (Department of the Army)	$769,602,725	4.8%	Rank history: not on the FY2021–FY2023 lists and #55 in FY2025; new.
3	Peter Kiewit Sons', Inc. 8 awardees, including Weeks Marine, Inc., Kiewit Infrastructure Co. and Kiewit Infrastructure West Co. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$684,874,602	4.3%	Rank history: #4 in FY2021, #16 in FY2022, #5 in FY2023 and #2 in FY2025; up 2 since FY2023.
4	Great Lakes Dredge & Dock Corporation 2 awardees, including Forgen LLC Top agencies Army (Department of the Army)	$638,159,978	4.0%	Rank history: #1 in FY2021, #5 in FY2022, #1 in FY2023 and #6 in FY2025; down 3 since FY2023.
5	381 Constructors Top agencies Navy (Department of the Navy)	$447,381,147	2.8%	Rank history: #29 in FY2021, #2 in FY2022, #3 in FY2023 and #5 in FY2025; down 2 since FY2023.
6	Kokosing Alberici Traylor, LLC Top agencies Army (Department of the Army)	$436,767,008	2.7%	Rank history: not on the FY2021 list, #1 in FY2022, #9 in FY2023 and #23 in FY2025; up 3 since FY2023.
7	Manson Construction Co. 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) Commerce (Department of Commerce)	$414,994,972	2.6%	Rank history: #8 in FY2021, #6 in FY2022, #4 in FY2023 and #7 in FY2025; down 3 since FY2023.
8	Tully Construction Co - Thalle Construction Co LLC Through Thalle Construction Co Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$365,380,389	2.3%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2025; new.
9	The Lane Construction Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army)	$210,542,306	1.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
10	Granite Construction Company Guam 2 awardees, including Granite Construction Company Top agencies DOT (Department of Transportation) Army (Department of the Army) Navy (Department of the Navy)	$183,868,670	1.1%	Rank history: not on the FY2021–FY2022 lists, #7 in FY2023 and #71 in FY2025; down 3 since FY2023.
11	CDM Constructors Inc. Top agencies DOI (Department of the Interior)	$175,284,992	1.1%	Rank history: not on the FY2021–FY2023 lists and #26 in FY2025; new.
12	Mccarthy Building Companies, Inc. Top agencies Army (Department of the Army)	$169,455,200	1.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
13	Ferrovial Construccion PR, LLC Top agencies Army (Department of the Army)	$150,656,464	0.9%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
14	Skanska USA Building Inc. 2 awardees, including Skanska USA Civil Northeast Inc. and Skanska USA Civil West California District Inc. Top agencies Commerce (Department of Commerce) Army (Department of the Army)	$147,744,750	0.9%	Rank history: not on the FY2021 list, #75 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
15	Jacobs Government Services Company Through Jacobs Project Management Co. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$143,819,380	0.9%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2025; new.
16	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$138,234,177	0.9%	Rank history: #42 in FY2021, #93 in FY2022, not on the FY2023 list and not on the FY2025 list; up 149 since FY2023.
17	R.c. Construction Co., Inc. Top agencies Army (Department of the Army) USSOCOM (United States Special Operations Command)	$134,673,767	0.8%	Rank history: #72 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
18	Triumph Construction Corp Top agencies Army (Department of the Army)	$132,681,088	0.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
19	Oscar Renda Contracting Inc. Top agencies DOI (Department of the Interior)	$131,793,019	0.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
20	Nova Nacap A Joint Venture Top agencies Navy (Department of the Navy)	$131,230,452	0.8%	Rank history: not on the FY2021 list, #29 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
21	The Dutra Group 2 awardees, including San Rafael Rock Quarry, Inc. Top agencies Army (Department of the Army)	$123,752,223	0.8%	Rank history: #7 in FY2021, #48 in FY2022, #10 in FY2023 and #40 in FY2025; down 11 since FY2023.
22	Callan Marine Limited Top agencies Army (Department of the Army)	$118,306,879	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
23	MEB General Contractors Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$117,682,130	0.7%	Rank history: not on the FY2021 list, #26 in FY2022, #53 in FY2023 and #79 in FY2025; up 30 since FY2023.
24	The Cianbro Companies Through Cianbro Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army)	$114,504,733	0.7%	Rank history: #25 in FY2021, #32 in FY2022, #19 in FY2023 and not on the FY2025 list; down 5 since FY2023.
25	Omega Foundation Services, Inc. Top agencies Army (Department of the Army)	$110,767,657	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
26	NW Construction, Inc. Top agencies DOI (Department of the Interior)	$101,597,818	0.6%	Rank history: not on the FY2021 list, #21 in FY2022, #52 in FY2023 and #11 in FY2025; up 26 since FY2023.
27	Reyes Construction, Inc. Top agencies Navy (Department of the Navy)	$96,545,522	0.6%	Rank history: #40 in FY2021, #36 in FY2022, not on the FY2023 list and #99 in FY2025; returned.
28	Aktarius LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$93,565,722	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
29	J.f. Brennan Company, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$92,629,991	0.6%	Rank history: #36 in FY2021, #83 in FY2022, not on the FY2023 list and #74 in FY2025; up 108 since FY2023.
30	Luhr Crosby, LLC Top agencies Army (Department of the Army)	$83,567,426	0.5%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023 and #56 in FY2025; up 15 since FY2023.
31	Knight Const. & Supply Inc Top agencies Army (Department of the Army)	$81,327,801	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 252 since FY2023.
32	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies DLA (Defense Logistics Agency)	$77,377,424	0.5%	Rank history: not on the FY2021–FY2023 lists and #67 in FY2025; new.
33	Rq-Magann JV Top agencies Navy (Department of the Navy)	$77,246,614	0.5%	Rank history: not on the FY2021 list, #34 in FY2022, #15 in FY2023 and not on the FY2025 list; down 18 since FY2023.
34	Seabee Construction, Inc. Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$73,737,539	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
35	Norfolk Dredging Company Top agencies Army (Department of the Army) Navy (Department of the Navy)	$71,877,905	0.4%	Rank history: #17 in FY2021, #14 in FY2022, #17 in FY2023 and #19 in FY2025; down 18 since FY2023.
36	Garco Construction, Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior) Army (Department of the Army)	$69,497,374	0.4%	Rank history: #15 in FY2021, not on the FY2022–FY2023 lists and #98 in FY2025; up 93 since FY2023.
37	Kokosing Construction Company, Inc. Top agencies DOT (Department of Transportation) DOI (Department of the Interior)	$67,180,064	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
38	Brice Civil Constructors Inc. 2 awardees Top agencies Army (Department of the Army)	$62,359,055	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 235 since FY2023.
39	Great Lakes Dock and Materials, L.L.C. Top agencies Army (Department of the Army)	$62,190,650	0.4%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2023 and not on the FY2025 list; up 51 since FY2023.
40	Encore Dredging Founding Partners LLC Through Inland Dredging Company, L.L.C. Top agencies Army (Department of the Army)	$62,132,080	0.4%	Rank history: #28 in FY2021, #46 in FY2022, #34 in FY2023 and not on the FY2025 list; down 6 since FY2023.
41	Obayashi CMS JV Top agencies Army (Department of the Army)	$60,170,304	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
42	South Bay EDC Inc. Top agencies Navy (Department of the Navy)	$59,135,775	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
43	Synergy Electric Company, Inc. Top agencies Navy (Department of the Navy)	$57,967,415	0.4%	Rank history: #44 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 130 since FY2023.
44	Cottrell Contracting Corporation Top agencies Army (Department of the Army)	$57,022,120	0.4%	Rank history: #80 in FY2021, #68 in FY2022, #72 in FY2023 and #41 in FY2025; up 28 since FY2023.
45	Estes Bros. Const. Inc. Top agencies DOT (Department of Transportation)	$54,532,663	0.3%	Rank history: #30 in FY2021, #59 in FY2022, #82 in FY2023 and #61 in FY2025; up 37 since FY2023.
46	Donjon Marine Co., LLC Top agencies Army (Department of the Army)	$53,959,827	0.3%	Rank history: #20 in FY2021, #30 in FY2022, #33 in FY2023 and #33 in FY2025; down 13 since FY2023.
47	Black Micro Corporation Top agencies Navy (Department of the Navy)	$53,313,288	0.3%	Rank history: not on the FY2021 list, #67 in FY2022, #8 in FY2023 and not on the FY2025 list; down 39 since FY2023.
48	Kiewit Infrastructure West Co. Top agencies Army (Department of the Army)	$52,472,467	0.3%	Rank history: not on the FY2021–FY2023 lists and #4 in FY2025; new.
49	David Boland Inc. Top agencies USSOCOM (United States Special Operations Command) Army (Department of the Army)	$52,369,644	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 94 since FY2023.
50	General Electric Company Through GE Renewables US LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOI (Department of the Interior)	$51,363,233	0.3%	Rank history: #85 in FY2021, not on the FY2022 list, #67 in FY2023 and #32 in FY2025; up 17 since FY2023.
51	Waterfront Property Services, LLC Top agencies Army (Department of the Army)	$46,655,844	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 213 since FY2023.
52	Gsi-Pond JV LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$46,003,978	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 95 since FY2023.
53	WSP USA Environment & Infrastructure Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$45,325,593	0.3%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2025; new.
54	C.j. Mahan Construction Company, LLC Top agencies Army (Department of the Army)	$45,129,814	0.3%	Rank history: #33 in FY2021, not on the FY2022–FY2023 lists and #43 in FY2025; up 192 since FY2023.
55	IAN Corporation Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$44,955,354	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
56	Energy Services Group Inc. Top agencies VA (Department of Veterans Affairs)	$44,647,379	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
57	Western Marine Construction, Inc. Top agencies Army (Department of the Army)	$44,497,770	0.3%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; new.
58	Pate Construction Co., Inc. Top agencies USAF (Department of the Air Force) DTRA (Defense Threat Reduction Agency)	$43,873,872	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 46 since FY2023.
59	Pine Bluff Sand and Gravel Company Top agencies Army (Department of the Army)	$43,797,894	0.3%	Rank history: #71 in FY2021, #78 in FY2022, not on the FY2023 list and #45 in FY2025; returned.
60	Bristol Bay Native Corporation 5 awardees, including CCI Facility Contractors, LLC, Specpro Environmental Services LLC and Bristol Engineering Services Company, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$43,702,284	0.3%	Rank history: not on the FY2021–FY2022 lists, #56 in FY2023 and not on the FY2025 list; down 4 since FY2023.
61	Chandler Construction Services, Inc. Top agencies Army (Department of the Army)	$42,969,424	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
62	Aptim Federal Services LLC Top agencies DLA (Defense Logistics Agency)	$42,942,505	0.3%	Rank history: not on the FY2021–FY2022 lists, #43 in FY2023 and not on the FY2025 list; down 19 since FY2023.
63	Seacoast Construction Inc. Top agencies Army (Department of the Army)	$42,853,850	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
64	Mike Hooks, LLC Top agencies Army (Department of the Army)	$42,668,532	0.3%	Rank history: #49 in FY2021, #25 in FY2022, #66 in FY2023 and #47 in FY2025; up 2 since FY2023.
65	JV SKE Italy 2012 Top agencies Army (Department of the Army)	$42,467,728	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
66	R.j. Zavoral & Sons, Inc. Top agencies Army (Department of the Army)	$42,450,278	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
67	PCL Construction Inc Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$42,435,504	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
68	G.M. Johnson Companies Inc. 2 awardees, including Occi, Inc. Top agencies Army (Department of the Army)	$42,113,030	0.3%	Rank history: #99 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 48 since FY2023.
69	Power Pro Plus Inc. Top agencies Navy (Department of the Navy)	$40,659,028	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 399 since FY2023.
70	Reliable Contracting Group, LLC Top agencies DLA (Defense Logistics Agency)	$38,756,150	0.2%	Rank history: #52 in FY2021, not on the FY2022 list, #75 in FY2023 and #35 in FY2025; up 5 since FY2023.
71	Rbvetco, LLC Top agencies VA (Department of Veterans Affairs)	$38,600,312	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
72	Nan Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$38,536,593	0.2%	Rank history: not on the FY2021 list, #86 in FY2022, not on the FY2023 list and #9 in FY2025; returned.
73	Shimmick Construction Company Inc. Top agencies Army (Department of the Army)	$38,471,176	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
74	Potawatomi Defense Operations LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$38,439,968	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
75	Ahtna Marine & Construction Company, LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$35,542,851	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 81 since FY2023.
76	Alltrack, Inc. Top agencies Army (Department of the Army)	$34,765,420	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
77	Northbank Civil and Marine, LLC Top agencies Army (Department of the Army)	$34,356,662	0.2%	Rank history: not on the FY2021–FY2023 lists and #68 in FY2025; up 105 since FY2023.
78	Civil Works Contracting LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$34,301,393	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 349 since FY2023.
79	HME Construction Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$33,217,930	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 270 since FY2023.
80	Acciona CMS Philippines LLC Top agencies Navy (Department of the Navy)	$32,967,076	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
81	J.e. Mcamis, Inc. Top agencies Army (Department of the Army)	$32,618,662	0.2%	Rank history: #13 in FY2021, #44 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
82	Roen Salvage Co Top agencies Army (Department of the Army)	$32,493,924	0.2%	Rank history: not on the FY2021–FY2023 lists and #81 in FY2025; new.
83	Joseph J. Albanese, Inc. Top agencies DOT (Department of Transportation)	$32,156,479	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
84	Steve Manning Construction Inc. Top agencies DOT (Department of Transportation)	$31,872,077	0.2%	Rank history: not on the FY2021 list, #72 in FY2022, #35 in FY2023 and #53 in FY2025; down 49 since FY2023.
85	Blumont Engineering Solutions Inc. Top agencies USAID (US Agency for International Development)	$31,755,180	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	Nova Group Inc. 2 awardees, including Northern Powerline Constructors, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$31,530,762	0.2%	Rank history: #95 in FY2021, #51 in FY2022, #42 in FY2023 and not on the FY2025 list; down 44 since FY2023.
87	Marinex Construction Inc. Top agencies Army (Department of the Army)	$30,593,968	0.2%	Rank history: #87 in FY2021, #80 in FY2022, #41 in FY2023 and not on the FY2025 list; down 46 since FY2023.
88	Marine Diving Solutions LLC. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$30,227,115	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
89	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$29,914,944	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
90	Goshawk, LLC 2 awardees Top agencies DLA (Defense Logistics Agency) DOI (Department of the Interior)	$29,841,972	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 23 since FY2023.
91	Appalachian Aggregates LLC 2 awardees, including H-K Contractors, Inc. Top agencies DOT (Department of Transportation)	$29,774,954	0.2%	Rank history: not on the FY2021 list, #28 in FY2022, #18 in FY2023 and not on the FY2025 list; down 73 since FY2023.
92	Ahtna-Forgen JV, LLC Top agencies Army (Department of the Army)	$29,698,894	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
93	Cashman Dredging and Marine Contracting Co. LLC Top agencies Army (Department of the Army)	$28,527,109	0.2%	Rank history: #59 in FY2021, #57 in FY2022, #59 in FY2023 and not on the FY2025 list; down 34 since FY2023.
94	Richard E Pierson Construction Co Inc. Top agencies Army (Department of the Army)	$28,414,195	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
95	Circle, LLC Top agencies Army (Department of the Army)	$28,105,353	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 24 since FY2023.
96	Barnard Construction Company, Incorporated Top agencies Army (Department of the Army) DOE (Department of Energy)	$28,027,542	0.2%	Rank history: not on the FY2021 list, #19 in FY2022, not on the FY2023 list and #14 in FY2025; up 367 since FY2023.
97	Coastal Construction Group, LLC Top agencies DOI (Department of the Interior)	$27,948,000	0.2%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2025; new.
98	Martin Brothers Construction Top agencies DOT (Department of Transportation) Army (Department of the Army) USAF (Department of the Air Force)	$27,578,282	0.2%	Rank history: #93 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 92 since FY2023.
99	OCI Overseas Holding Limited Through Contrack Watts Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$26,987,678	0.2%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and #15 in FY2025; down 13 since FY2023.
100	Kekolu-Rio Vista Joint Venture, LLC Top agencies Army (Department of the Army)	$26,188,587	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.

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100 of 2,538 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	$10,238,465,127	Dragados / Hawaiian Dredging / Orion JV
2371 Utility System Construction	$2,630,618,878	CDM Constructors Inc.
2373 Highway, Street, and Bridge Construction	$2,577,553,471	The Lane Construction Corporation

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 $16.1 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 FY2024?

1. Dragados / Hawaiian Dredging / Orion JV ($791M), 2. Trumbull Corporation and Brayman Construction Corporation, A Joint Venture ($770M), 3. Peter Kiewit Sons', Inc. ($685M), 4. Great Lakes Dredge & Dock Corporation ($638M), 5. 381 Constructors ($447M), 6. Kokosing Alberici Traylor, LLC ($437M), 7. Manson Construction Co. ($415M), 8. Tully Construction Co - Thalle Construction Co LLC ($365M), 9. The Lane Construction Corporation ($211M), 10. Granite Construction Company Guam ($184M).

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