Top 100 Contractors in NAICS 23: Construction, FY2021

Name: Top 100 Contractors in NAICS 23: Construction, FY2021
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

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

The top 10 won 14% of FY2021 NAICS 23 contract dollars

Contract obligations: $38,420,557,321 Net of deobligations, by contracts coded NAICS 23 or a code under it
Contractors: 10,185 Parent companies with an obligation
Largest contractor: Hensel Phelps Construction Co $1.06 billion, 2.6% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Hensel Phelps Construction Co 9 awardees, including Hensel Phelps - Shimizu JV Top agencies Army (Department of the Army) Navy (Department of the Navy) Commerce (Department of Commerce)	$1,063,301,536	2.6%	Rank history: #1 in FY2022, #13 in FY2023, #3 in FY2024 and #10 in FY2025; up 4 since FY2020.
2	Walsh - Turner JV II Top agencies VA (Department of Veterans Affairs)	$840,130,368	2.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
3	The Whiting-Turner Contracting Company Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) GSA (General Services Administration)	$730,422,556	1.8%	Rank history: #10 in FY2022, #3 in FY2023, #10 in FY2024 and #7 in FY2025; up 4 since FY2020.
4	Core Tech-Hdcc-Kajima LLC Top agencies Navy (Department of the Navy)	$730,391,353	1.8%	Rank history: not on the FY2022 list, #43 in FY2023, #30 in FY2024 and #14 in FY2025; new, not ranked in FY2020.
5	Great Lakes Dredge & Dock Corporation 2 awardees, including Forgen LLC Top agencies Army (Department of the Army)	$510,888,237	1.3%	Rank history: #13 in FY2022, #9 in FY2023, #8 in FY2024 and #19 in FY2025; up 7 since FY2020.
6	B.l. Harbert Holdings, L.L.C. Through BL Harbert International LLC Top agencies USAF (Department of the Air Force) DOS (Department of State) Army (Department of the Army)	$486,894,580	1.2%	Rank history: #3 in FY2022, #11 in FY2023, #6 in FY2024 and not on the FY2025 list; up 4 since FY2020.
7	The Walsh Group 7 awardees, including Archer Western Federal JV, Walsh Construction Company II, LLC and Archer Western Construction, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$385,268,200	1.0%	Rank history: #31 in FY2022, #12 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
8	Alberici-Mortenson A Joint Venture Top agencies Navy (Department of the Navy)	$369,949,779	0.9%	Rank history: not on the FY2022–FY2025 lists; up 27 since FY2020.
9	RQ Construction, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$356,424,856	0.9%	Rank history: #8 in FY2022, #16 in FY2023, #21 in FY2024 and #8 in FY2025; up 10 since FY2020.
10	Tutor Perini Corporation 5 awardees, including Black Construction Corporation, ROY Anderson Corp and Perini Management Services, Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DOL (Department of Labor)	$319,736,204	0.8%	Rank history: #11 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; up 18 since FY2020.
11	Pernix International, LLC Top agencies DOS (Department of State)	$319,227,392	0.8%	Rank history: not on the FY2022 list, #40 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
12	Parsons Corporation 3 awardees, including Parsons Government Services Inc., Ptsi Managed Services Inc. and Williams Electric Co Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) NASA (National Aeronautics and Space Administration)	$269,768,692	0.7%	Rank history: not on the FY2022 list, #44 in FY2023, #39 in FY2024 and #25 in FY2025; up 58 since FY2020.
13	Harper Construction Company, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$258,129,910	0.6%	Rank history: #30 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
14	Peter Kiewit Sons', Inc. 8 awardees, including Kiewit Infrastructure South Co, Kiewit Infrastructure West Co and Kiewit Infrastructure Co. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$256,007,576	0.6%	Rank history: #43 in FY2022, #19 in FY2023, #7 in FY2024 and #5 in FY2025; up 27 since FY2020.
15	Caddell Construction Co., Inc. 2 awardees, including Caddell Construction Co. (De), LLC Top agencies DOS (Department of State) Army (Department of the Army) USAF (Department of the Air Force)	$229,365,917	0.6%	Rank history: #2 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
16	American International Contractors (Special Projects) Inc. Top agencies DOS (Department of State) Army (Department of the Army)	$228,542,680	0.6%	Rank history: not on the FY2022–FY2025 lists; up 258 since FY2020.
17	Webuild S.p.A. Through The Lane Construction Corporation Top agencies Army (Department of the Army)	$219,026,187	0.5%	Rank history: #7 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
18	Hcbeck Ltd. Top agencies HHS (Department of Health and Human Services)	$202,632,769	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	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	0.5%	Rank history: #42 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
20	Dobco Inc. Top agencies Army (Department of the Army)	$195,830,123	0.5%	Rank history: not on the FY2022–FY2025 lists; up 276 since FY2020.
21	Obayashi Corporation 3 awardees, including Webcor Construction LP and Kraemer North America LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$189,634,100	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
22	Itsi Gilbane Japan G.K. 4 awardees, including Gilbane Federal, Gilbane Japan GK and Gilbane Building Company Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$188,782,243	0.5%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
23	Turner Construction Company 5 awardees, including Sociedad Espanola De Montajes Industriales SA, Flatiron Dragados Usa, Inc. and Cobra Instalaciones Y Servicios, S.a.u. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) SSA (Social Security Administration)	$188,136,873	0.5%	Rank history: #71 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; up 7 since FY2020.
24	Clark Construction Group LLC 6 awardees, including Atkinson / Clark, A Joint Venture, Clark Construction LLC and Shirley Contracting Company, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) VA (Department of Veterans Affairs)	$182,093,214	0.5%	Rank history: #32 in FY2022, #6 in FY2023, #1 in FY2024 and #12 in FY2025; up 19 since FY2020.
25	Brasfield & Gorrie LLC Top agencies GSA (General Services Administration) DOT (Department of Transportation) Army (Department of the Army)	$178,195,361	0.4%	Rank history: #40 in FY2022, #2 in FY2023, #9 in FY2024 and #15 in FY2025; new, not ranked in FY2020.
26	UEI WWFNFCV65M13 Top agencies Army (Department of the Army)	$175,476,725	0.4%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 242 since FY2020.
27	Grunley Construction Co., Inc. Top agencies Army (Department of the Army) Smithsonian (Smithsonian Institution) DOI (Department of the Interior)	$168,634,366	0.4%	Rank history: #9 in FY2022, #21 in FY2023, #29 in FY2024 and #45 in FY2025; down 5 since FY2020.
28	Thalle Construction Co Inc. Top agencies Army (Department of the Army)	$167,255,582	0.4%	Rank history: #27 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
29	JE Dunn Construction Group Inc. Through J.e. Dunn Construction Company Top agencies Army (Department of the Army) GSA (General Services Administration) USAF (Department of the Air Force)	$163,289,629	0.4%	Rank history: #22 in FY2022, not on the FY2023 list, #84 in FY2024 and not on the FY2025 list; up 92 since FY2020.
30	Aptim Federal Services LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$160,504,206	0.4%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
31	M.c. Dean, Inc. Top agencies Army (Department of the Army) DOJ (Department of Justice) Smithsonian (Smithsonian Institution)	$160,074,594	0.4%	Rank history: not on the FY2022–FY2025 lists; up 235 since FY2020.
32	The Dutra Group Top agencies Army (Department of the Army) Navy (Department of the Navy)	$152,165,496	0.4%	Rank history: not on the FY2022 list, #41 in FY2023, #65 in FY2024 and not on the FY2025 list; up 51 since FY2020.
33	Manson Construction Co. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$151,765,064	0.4%	Rank history: #17 in FY2022, #20 in FY2023, #17 in FY2024 and #21 in FY2025; down 18 since FY2020.
34	Rooney Holdings, Inc. Through Manhattan Construction Company LLC Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) Navy (Department of the Navy)	$150,787,917	0.4%	Rank history: not on the FY2022–FY2025 lists; up 196 since FY2020.
35	AECOM 10 awardees, including AECOM Technical Services, Inc., Shimmick Construction Company, Inc. and URS Group, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$142,223,698	0.4%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; down 14 since FY2020.
36	J Kokolakis Contracting Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$139,302,992	0.3%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
37	Korte Construction Company Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$138,879,345	0.3%	Rank history: #96 in FY2022, #70 in FY2023, #28 in FY2024 and #41 in FY2025; up 30 since FY2020.
38	Solpac Construction Inc. Top agencies Navy (Department of the Navy)	$136,768,983	0.3%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
39	Maloney-Odin JV Top agencies Army (Department of the Army)	$134,682,668	0.3%	Rank history: not on the FY2022–FY2025 lists; up 61 since FY2020.
40	Cook Inlet Region Inc. 8 awardees, including North Wind Construction Services, LLC, Weldin Construction LLC and Silver Mountain Construction, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$133,682,923	0.3%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
41	Zodiac, Inc. Through Zodiac-Poettker HBZ Joint Venture II, LLC Top agencies Army (Department of the Army)	$129,008,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	JX Holdings Inc. 2 awardees, including Nippo Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$128,198,058	0.3%	Rank history: #16 in FY2022, #25 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
43	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	0.3%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
44	Jacobs Engineering Group Inc. 5 awardees, including Ch2M Hill Constructors, Inc., Ch2M Facility Support Services, LLC and Jacobs Project Management Co. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) EPA (Environmental Protection Agency)	$121,600,522	0.3%	Rank history: #82 in FY2022 and not on the FY2023–FY2025 lists; up 64 since FY2020.
45	Walsh Federal LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army) Navy (Department of the Navy)	$120,205,312	0.3%	Rank history: #21 in FY2022, #4 in FY2023, #27 in FY2024 and #20 in FY2025; down 31 since FY2020.
46	CMS Corporation Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$115,455,319	0.3%	Rank history: #70 in FY2022, #62 in FY2023, #19 in FY2024 and #74 in FY2025; up 109 since FY2020.
47	Garco Construction, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOI (Department of the Interior)	$114,292,304	0.3%	Rank history: not on the FY2022–FY2023 lists, #46 in FY2024 and not on the FY2025 list; up 171 since FY2020.
48	Messer Construction Co Top agencies Army (Department of the Army) USAF (Department of the Air Force) GSA (General Services Administration)	$113,896,083	0.3%	Rank history: not on the FY2022 list, #42 in FY2023, #75 in FY2024 and not on the FY2025 list; down 2 since FY2020.
49	ACC Construction Co., Inc. Top agencies Army (Department of the Army)	$113,749,236	0.3%	Rank history: #91 in FY2022, #77 in FY2023, not on the FY2024 list and #29 in FY2025; up 183 since FY2020.
50	Sauer Holdings Inc. 2 awardees, including Sauer Construction, LLC and Ruthrauff Sauer, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$113,239,390	0.3%	Rank history: #24 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
51	Andritz AG Through Andritz Hydro Corp Top agencies Army (Department of the Army) DOI (Department of the Interior)	$110,871,560	0.3%	Rank history: not on the FY2022 list, #71 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
52	Volmar Construction Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice)	$101,686,052	0.3%	Rank history: not on the FY2022–FY2024 lists and #93 in FY2025; up 113 since FY2020.
53	American Engineering Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$100,062,288	0.2%	Rank history: #36 in FY2022, #48 in FY2023, #80 in FY2024 and not on the FY2025 list; up 32 since FY2020.
54	Black Construction-Tutor Perini JV Top agencies Navy (Department of the Navy)	$98,512,457	0.2%	Rank history: #19 in FY2022, not on the FY2023 list, #31 in FY2024 and #56 in FY2025; up 92 since FY2020.
55	J.e. Mcamis, Inc. Top agencies Army (Department of the Army)	$98,174,105	0.2%	Rank history: not on the FY2022–FY2025 lists; up 55 since FY2020.
56	CCI Utility and Construction Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$98,168,181	0.2%	Rank history: #49 in FY2022, #73 in FY2023, #53 in FY2024 and #51 in FY2025; down 18 since FY2020.
57	H2O Guam JV Top agencies Navy (Department of the Navy)	$97,995,000	0.2%	Rank history: not on the FY2022 list, #63 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
58	Rq-Aecom 2 JV Top agencies DHS (Department of Homeland Security)	$97,938,962	0.2%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
59	Xator LLC 2 awardees, including Incadence Strategic Solutions LLC Top agencies DOS (Department of State) Army (Department of the Army)	$94,993,611	0.2%	Rank history: #72 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; up 20 since FY2020.
60	Camp Dresser & Mckee Inc. 5 awardees, including CDM Constructors Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) Navy (Department of the Navy)	$90,614,844	0.2%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
61	Mccarthy Hitt - Next NGA West Joint Venture Top agencies Army (Department of the Army)	$90,440,815	0.2%	Rank history: not on the FY2022–FY2025 lists; down 27 since FY2020.
62	J & J Maintenance Inc. 2 awardees, including J&J Germany GMBH Top agencies DHA (Defense Health Agency) Army (Department of the Army) USAF (Department of the Air Force)	$89,507,425	0.2%	Rank history: #25 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
63	Four Tribes Enterprises, LLC 2 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army) USDA (Department of Agriculture)	$85,505,036	0.2%	Rank history: not on the FY2022–FY2025 lists; up 27 since FY2020.
64	Conti Enterprises Inc. 2 awardees, including Conti Federal Services, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$85,135,314	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Continental Heavy Civil Corp Top agencies Army (Department of the Army) DOI (Department of the Interior)	$84,113,736	0.2%	Rank history: not on the FY2022–FY2025 lists; up 264 since FY2020.
66	Norfolk Dredging Company Top agencies Army (Department of the Army) Navy (Department of the Navy)	$84,042,269	0.2%	Rank history: #37 in FY2022, #65 in FY2023, not on the FY2024 list and #55 in FY2025; up 197 since FY2020.
67	Afci-Cci JV One LLC Top agencies VA (Department of Veterans Affairs)	$82,448,387	0.2%	Rank history: not on the FY2022–FY2025 lists; up 408 since FY2020.
68	RC Construction Co & Millstone Weber A Joint Venture Top agencies Army (Department of the Army)	$81,554,847	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Mvl-Percassi-Gemmo JV LLC Top agencies Navy (Department of the Navy)	$81,489,560	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Wood Environment & Infrastructure Solutions Inc. 6 awardees, including WSP USA Environment & Infrastructure Inc., WSP E&Is GMBH and Ethosenergy Field Services, LLC Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) HHS (Department of Health and Human Services)	$80,912,467	0.2%	Rank history: not on the FY2022–FY2025 lists; up 166 since FY2020.
71	Seqirus USA Inc. Through Seqirus Inc. Top agencies HHS (Department of Health and Human Services)	$80,383,271	0.2%	Rank history: not on the FY2022–FY2025 lists; up 27 since FY2020.
72	Phylway Construction, L.l.c Top agencies Army (Department of the Army)	$79,645,687	0.2%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
73	Donjon Marine Co., LLC Top agencies Army (Department of the Army)	$79,217,663	0.2%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; up 105 since FY2020.
74	Southwest Valley Constructors Co Top agencies Army (Department of the Army)	$78,403,491	0.2%	Rank history: not on the FY2022–FY2025 lists; down 72 since FY2020.
75	Advon Corporation Top agencies VA (Department of Veterans Affairs) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$77,451,471	0.2%	Rank history: not on the FY2022–FY2025 lists; up 283 since FY2020.
76	Nana Regional Corporation Inc 6 awardees, including Portico Services LLC, Jade Creek Construction LLC and Akima Construction Services LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$77,222,120	0.2%	Rank history: not on the FY2022–FY2025 lists; up 267 since FY2020.
77	Nishimatsu Construction Co.,Ltd. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$76,370,001	0.2%	Rank history: not on the FY2022 list, #38 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
78	HHI Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$76,283,763	0.2%	Rank history: #77 in FY2022, #58 in FY2023, #87 in FY2024 and #59 in FY2025; up 78 since FY2020.
79	Contrack International Inc. Through Contrack Watts Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$75,549,103	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Luhr Bros., Inc. Top agencies Army (Department of the Army)	$75,486,315	0.2%	Rank history: not on the FY2022–FY2025 lists; up 35 since FY2020.
81	The Cianbro Companies Through Cianbro Corporation Top agencies Navy (Department of the Navy)	$75,427,022	0.2%	Rank history: #88 in FY2022, #72 in FY2023, #74 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
82	Ahtna-Great Lakes E&I JV Top agencies Army (Department of the Army)	$74,719,112	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Rigid Constructors LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$74,666,701	0.2%	Rank history: not on the FY2022–FY2025 lists; up 177 since FY2020.
84	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$74,400,962	0.2%	Rank history: not on the FY2022 list, #1 in FY2023, #12 in FY2024 and not on the FY2025 list; down 36 since FY2020.
85	Natives of Kodiak, Incorporated 6 awardees, including Koman Construction, LLC, Koman Government Solutions LLC and Stormwater Plans, LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Army (Department of the Army)	$73,922,920	0.2%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
86	M. a. Mortenson Companies Inc. Through M.a. Mortenson Company Top agencies Army (Department of the Army) USDA (Department of Agriculture) Navy (Department of the Navy)	$72,831,900	0.2%	Rank history: #44 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; down 31 since FY2020.
87	Phillips Heavy, Inc. Top agencies Army (Department of the Army)	$72,683,248	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Sea Pac Engineering Inc. Top agencies DOS (Department of State) Navy (Department of the Navy) Army (Department of the Army)	$70,964,321	0.2%	Rank history: not on the FY2022–FY2025 lists; up 169 since FY2020.
89	Medvolt Construction Services, LLC Top agencies Army (Department of the Army)	$70,738,111	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Encore Dredging Founding Partners LLC Through Inland Dredging Company, L.L.C. Top agencies Army (Department of the Army)	$70,252,842	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	381 Constructors Top agencies Navy (Department of the Navy)	$70,000,000	0.2%	Rank history: #6 in FY2022, #17 in FY2023, #13 in FY2024 and #17 in FY2025; new, not ranked in FY2020.
92	Estes Bros. Const. Inc. Top agencies DOT (Department of Transportation) DOI (Department of the Interior) DOJ (Department of Justice)	$69,643,077	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Granite-Obayashi A Joint Venture Top agencies Navy (Department of the Navy)	$68,910,030	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
94	Bechtel Corp Through Bechtel National, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$67,277,500	0.2%	Rank history: not on the FY2022 list, #28 in FY2023, #24 in FY2024 and #23 in FY2025; up 57 since FY2020.
95	Industrial Builders Inc. Top agencies Army (Department of the Army)	$67,115,891	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Caddell-Nan A Joint Venture Top agencies Navy (Department of the Navy)	$66,555,528	0.2%	Rank history: not on the FY2022–FY2023 lists, #66 in FY2024 and not on the FY2025 list; down 72 since FY2020.
97	C.j. Mahan Construction Company, LLC Top agencies Army (Department of the Army)	$66,422,633	0.2%	Rank history: not on the FY2022–FY2025 lists; up 111 since FY2020.
98	Valiant Construction LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$65,684,252	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Mccarthy Mortenson Nbaf A Joint Venture Top agencies DHS (Department of Homeland Security)	$65,244,333	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Methuen Construction Co Inc. Top agencies Navy (Department of the Navy)	$65,133,632	0.2%	Rank history: not on the FY2022–FY2025 lists; up 62 since FY2020.

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100 of 10,185 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 23

Code	Net obligations	Largest contractor
236 Construction of Buildings	$24,758,496,147	Hensel Phelps Construction Co
237 Heavy and Civil Engineering Construction	$10,017,653,287	Great Lakes Dredge & Dock Corporation
238 Specialty Trade Contractors	$3,644,407,887	UEI WWFNFCV65M13

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 $40.2 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 23 contractors in FY2021?

1. Hensel Phelps Construction Co ($1.06B), 2. Walsh - Turner JV II ($840M), 3. The Whiting-Turner Contracting Company ($730M), 4. Core Tech-Hdcc-Kajima LLC ($730M), 5. Great Lakes Dredge & Dock Corporation ($511M), 6. B.l. Harbert Holdings, L.L.C. ($487M), 7. The Walsh Group ($385M), 8. Alberici-Mortenson A Joint Venture ($370M), 9. RQ Construction, LLC ($356M), 10. Tutor Perini Corporation ($320M).

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