Top 100 Contractors in PSC Z1: Maintenance, Alteration, Repair Buildings, FY2021

Name: Top 100 Contractors in PSC Z1: Maintenance, Alteration, Repair Buildings, 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 PSC Z1 contract dollars

Contract obligations: $5,967,822,085 Net of deobligations, by contracts coded PSC Z1 or a code under it
Contractors: 3,758 Parent companies with an obligation
Largest contractor: Amentum Services, Inc. $462 million, 6.9% 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	Amentum Services, Inc. 4 awardees, including Central Plateau Cleanup Company, LLC, URS Federal Services International, Inc. and Dyncorp International LLC Top agencies DOE (Department of Energy) DTRA (Defense Threat Reduction Agency) NASA (National Aeronautics and Space Administration)	$461,606,748	6.9%	Rank history: #1 in FY2022, #1 in FY2023, #2 in FY2024 and not on the FY2025 list; up 234 since FY2020.
2	Jacobs Engineering Group Inc. 5 awardees, including Amentum Technology, Inc., Ch2M Hill, Inc. and Jacobs Project Management Co Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency)	$153,591,145	2.3%	Rank history: #3 in FY2022, #4 in FY2023, #31 in FY2024 and not on the FY2025 list; up 1 since FY2020.
3	J & J Maintenance Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$141,838,224	2.1%	Rank history: #2 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; down 2 since FY2020.
4	Hensel Phelps Construction Co 2 awardees, including Hensel Phelps Services LLC Top agencies Commerce (Department of Commerce) DOJ (Department of Justice)	$115,419,727	1.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
5	EMCOR Group, Inc. 4 awardees, including Emcor Government Services, Inc., Baker Electric, Inc. and Shambaugh & Son, L.P Top agencies GAO (Government Accountability Office) DHA (Defense Health Agency) GSA (General Services Administration)	$99,996,640	1.5%	Rank history: #8 in FY2022, #13 in FY2023, #22 in FY2024 and #25 in FY2025; up 10 since FY2020.
6	Andritz AG Through Andritz Hydro Corp Top agencies Army (Department of the Army) DOI (Department of the Interior)	$96,554,328	1.4%	Rank history: not on the FY2022 list, #83 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
7	The Dutra Group Top agencies Army (Department of the Army)	$84,732,170	1.3%	Rank history: not on the FY2022 list, #31 in FY2023, #87 in FY2024 and #30 in FY2025; up 48 since FY2020.
8	Continental Heavy Civil Corp Top agencies Army (Department of the Army)	$77,834,064	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
9	Norfolk Dredging Company Top agencies Army (Department of the Army) Navy (Department of the Navy)	$74,534,225	1.1%	Rank history: #12 in FY2022, #7 in FY2023, #63 in FY2024 and #10 in FY2025; new, not ranked in FY2020.
10	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$65,979,583	1.0%	Rank history: #11 in FY2022, #10 in FY2023, #11 in FY2024 and #23 in FY2025; up 1 since FY2020.
11	DGG Re Investments LLC Top agencies HUD (Department of Housing and Urban Development)	$61,669,179	0.9%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
12	Arctic Slope Regional Corporation 3 awardees, including Asrc Communications, Ltd., Asrc Consulting & Environmental Services, LLC and Asrc Federal Field Services, LLC Top agencies USAF (Department of the Air Force) DOI (Department of the Interior)	$58,104,847	0.9%	Rank history: #20 in FY2022, #33 in FY2023, #7 in FY2024 and #4 in FY2025; up 4 since FY2020.
13	Afognak Native Corporation 7 awardees, including Alutiiq Commercial Enterprises LLC, Alutiiq Construction Services, LLC and Alutiiq C&W Services, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Treasury (Department of the Treasury)	$55,866,080	0.8%	Rank history: #9 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
14	JE Dunn Construction Group Inc. Through J.e. Dunn Construction Company Top agencies GSA (General Services Administration)	$53,728,352	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
15	The Tatitlek Corporation 4 awardees, including Tatitlek Technologies, LLC, Port Fidalgo Constructors Inc. and Tatitlek Construction Services Inc. Top agencies DOS (Department of State) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$53,190,405	0.8%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
16	General Dynamics Corporation 4 awardees, including General Dynamics Mission Systems, Inc. and General Dynamics Land Systems Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$51,581,720	0.8%	Rank history: #5 in FY2022, #12 in FY2023, #5 in FY2024 and #5 in FY2025; up 3 since FY2020.
17	Professional Contract Services, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$51,228,153	0.8%	Rank history: #14 in FY2022, #20 in FY2023, #15 in FY2024 and #17 in FY2025; up 53 since FY2020.
18	Chugach Alaska Corporation 5 awardees, including Wolf Creek Federal Services LLC, Defense Base Services, LLC and Chugach Consolidated Solutions, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$50,027,216	0.7%	Rank history: #16 in FY2022, #19 in FY2023, #48 in FY2024 and not on the FY2025 list; down 10 since FY2020.
19	Mina Petroleum FZE Top agencies DLA (Defense Logistics Agency)	$46,859,368	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
20	Encore Dredging Founding Partners LLC Through Inland Dredging Company, L.L.C. Top agencies Army (Department of the Army)	$46,188,264	0.7%	Rank history: not on the FY2022 list, #38 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
21	Skookum Educational Programs Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) Army (Department of the Army)	$45,810,988	0.7%	Rank history: #23 in FY2022, #18 in FY2023, #42 in FY2024 and #65 in FY2025; down 9 since FY2020.
22	The Whiting-Turner Contracting Company Top agencies Commerce (Department of Commerce) Army (Department of the Army) USDA (Department of Agriculture)	$45,393,391	0.7%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
23	Nova Global Supply and Services LLC 2 awardees, including Valiant Government Services LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) Navy (Department of the Navy)	$43,952,614	0.7%	Rank history: #27 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
24	Facility Services Management, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$42,393,571	0.6%	Rank history: #21 in FY2022, #6 in FY2023, #6 in FY2024 and #12 in FY2025; down 4 since FY2020.
25	Manson Construction Co. Top agencies Army (Department of the Army)	$41,874,097	0.6%	Rank history: #26 in FY2022, #37 in FY2023, #35 in FY2024 and #48 in FY2025; up 23 since FY2020.
26	Herman Construction Group, Inc. Top agencies Army (Department of the Army)	$41,860,573	0.6%	Rank history: #42 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 66 since FY2020.
27	Tetra Tech-Maytag Aircraft Corporation Joint Venture Top agencies DLA (Defense Logistics Agency)	$38,742,582	0.6%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
28	Great Lakes Dredge & Dock Corporation 2 awardees, including Forgen LLC Top agencies Army (Department of the Army)	$37,395,371	0.6%	Rank history: #4 in FY2022, #5 in FY2023, #1 in FY2024 and #2 in FY2025; down 24 since FY2020.
29	Industries for the Blind and Visually Impaired, Inc. Top agencies Commerce (Department of Commerce)	$36,673,467	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	Aptim Federal Services LLC Top agencies DLA (Defense Logistics Agency)	$36,549,551	0.5%	Rank history: #10 in FY2022, #8 in FY2023, #46 in FY2024 and not on the FY2025 list; down 12 since FY2020.
31	Vectrus Systems Corporation 2 awardees, including V2X Systems LLC Top agencies Navy (Department of the Navy)	$33,816,336	0.5%	Rank history: #19 in FY2022, #32 in FY2023, #73 in FY2024 and not on the FY2025 list; up 10 since FY2020.
32	B.l. Harbert Holdings, L.L.C. Through BL Harbert International LLC Top agencies Army (Department of the Army)	$32,876,962	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	Union Station Venture, Ltd. 2 awardees, including Jones Lang Lasalle Americas, Inc. Top agencies GSA (General Services Administration) DECA (Defense Commissary Agency) AOUSC (Administrative Office of the U.S. Courts)	$32,155,804	0.5%	Rank history: #13 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
34	Georgia TECH Research Corp Through Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force)	$31,247,500	0.5%	Rank history: not on the FY2022 list, #68 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
35	Jll-Midnight Sun Ifms LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$30,027,316	0.5%	Rank history: #31 in FY2022, #48 in FY2023, #39 in FY2024 and #36 in FY2025; up 12 since FY2020.
36	Weeks Marine Inc. 2 awardees, including Healy Tibbitts Builders, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$29,602,276	0.4%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
37	Venegas Construction Corp Top agencies DHS (Department of Homeland Security)	$28,451,454	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Swan Contracting LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Army (Department of the Army)	$28,223,441	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Natives of Kodiak, Incorporated 5 awardees, including Koman Construction, LLC, Koman Government Solutions LLC and Trinity Analysis and Development Corp. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) DOI (Department of the Interior)	$26,307,729	0.4%	Rank history: not on the FY2022 list, #86 in FY2023 and not on the FY2024–FY2025 lists; up 18 since FY2020.
40	Puyenpa Services, LLC Top agencies WHS (DOD Washington Headquarters Service) Smithsonian (Smithsonian Institution) GSA (General Services Administration)	$25,634,436	0.4%	Rank history: not on the FY2022–FY2025 lists; up 324 since FY2020.
41	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)	$25,620,658	0.4%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; up 314 since FY2020.
42	The Povolny Group Inc. Top agencies VA (Department of Veterans Affairs)	$25,321,656	0.4%	Rank history: not on the FY2022 list, #65 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
43	Midwest Construction Co Top agencies Army (Department of the Army)	$24,567,777	0.4%	Rank history: #55 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
44	Marinex Construction Inc. Top agencies Army (Department of the Army)	$23,952,197	0.4%	Rank history: #29 in FY2022, #14 in FY2023, #40 in FY2024 and #63 in FY2025; down 35 since FY2020.
45	Orion Marine Group Inc. Through Orion Marine Construction, Inc. Top agencies Army (Department of the Army)	$23,838,137	0.4%	Rank history: #38 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 22 since FY2020.
46	Action Facilities Management Inc. 2 awardees, including Action Integrated Services LLC Top agencies GSA (General Services Administration) DOJ (Department of Justice) Army (Department of the Army)	$23,424,549	0.4%	Rank history: #44 in FY2022, #21 in FY2023, #14 in FY2024 and #9 in FY2025; up 18 since FY2020.
47	Pensacola Bay Support Services LLC Top agencies Navy (Department of the Navy)	$23,423,391	0.4%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 3 since FY2020.
48	King & George, LLC 2 awardees, including Invicta Global, LLC Top agencies GSA (General Services Administration) USAF (Department of the Air Force) Army (Department of the Army)	$23,266,676	0.3%	Rank history: #37 in FY2022, #64 in FY2023, #54 in FY2024 and #35 in FY2025; up 98 since FY2020.
49	Silver Lake Construction LLC Top agencies Commerce (Department of Commerce) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$22,792,490	0.3%	Rank history: not on the FY2022–FY2025 lists; up 151 since FY2020.
50	GCH Construction Company Top agencies VA (Department of Veterans Affairs)	$22,649,323	0.3%	Rank history: not on the FY2022–FY2025 lists; up 201 since FY2020.
51	Tlingit Haida Tribal Business Corporation 3 awardees, including T&H Services, LLC, Kira Aviation Services LLC and Kira LLC Top agencies DOS (Department of State) Navy (Department of the Navy) GSA (General Services Administration)	$22,121,490	0.3%	Rank history: #47 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; down 23 since FY2020.
52	Richard Group LLC Top agencies VA (Department of Veterans Affairs)	$22,096,078	0.3%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
53	Asturian-Consigli JV, LLC Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$20,864,957	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	The Chenega Corporation 4 awardees, including Chenega Tri-Services, LLC, Chenega Facilities Management LLC and Chenega Applied Solutions, LLC Top agencies DOI (Department of the Interior) DHS (Department of Homeland Security) Army (Department of the Army)	$20,729,101	0.3%	Rank history: #54 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 131 since FY2020.
55	UEI WWFNFCV65M13 Top agencies Army (Department of the Army)	$19,951,590	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	District Veterans Contracting, Inc. Top agencies VA (Department of Veterans Affairs)	$19,640,393	0.3%	Rank history: not on the FY2022–FY2025 lists; up 139 since FY2020.
57	SKE Technical Services GMBH 3 awardees, including SKE Support Services GMBH and SKE SRL Top agencies Army (Department of the Army) USAF (Department of the Air Force) DODEA (Department of Defense Education Activity)	$19,206,728	0.3%	Rank history: #49 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
58	American Engineering Corporation Top agencies Navy (Department of the Navy) DODEA (Department of Defense Education Activity) Army (Department of the Army)	$19,002,990	0.3%	Rank history: #17 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
59	Tactical Infrastructure Maintenance Solutions LLC Top agencies DHS (Department of Homeland Security)	$18,512,108	0.3%	Rank history: #70 in FY2022, #94 in FY2023, #76 in FY2024 and #64 in FY2025; new, not ranked in FY2020.
60	Pond Constructors Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$18,220,887	0.3%	Rank history: #22 in FY2022, #17 in FY2023, #10 in FY2024 and #16 in FY2025; down 43 since FY2020.
61	Troop Contracting Inc. Top agencies VA (Department of Veterans Affairs)	$17,890,386	0.3%	Rank history: not on the FY2022–FY2025 lists; up 59 since FY2020.
62	PAE Government Services Inc. 2 awardees, including Amentum Design and Facility Management Top agencies DOS (Department of State) Navy (Department of the Navy)	$17,856,478	0.3%	Rank history: #93 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; up 38 since FY2020.
63	Royce Construction Services, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$17,761,162	0.3%	Rank history: #71 in FY2022, #56 in FY2023, #77 in FY2024 and not on the FY2025 list; up 6 since FY2020.
64	Bristol Bay Native Corporation 3 awardees, including Specpro Environmental Services LLC, CCI Energy and Construction Services, LLC and CCI Construction Services, LLC Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) DOJ (Department of Justice)	$17,106,280	0.3%	Rank history: #62 in FY2022, #75 in FY2023, #47 in FY2024 and #31 in FY2025; down 38 since FY2020.
65	Luhr Bros., Inc. Top agencies Army (Department of the Army)	$17,080,238	0.3%	Rank history: not on the FY2022–FY2025 lists; down 26 since FY2020.
66	Cottrell Contracting Corporation Top agencies Army (Department of the Army)	$16,841,420	0.3%	Rank history: not on the FY2022 list, #93 in FY2023, #24 in FY2024 and #20 in FY2025; up 281 since FY2020.
67	Alutiiq Commercial Enterprises LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$16,091,617	0.2%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
68	Louis Berger U.S. Inc. 2 awardees, including VGS Infrastructure Services Inc. Top agencies DLA (Defense Logistics Agency)	$16,037,918	0.2%	Rank history: #40 in FY2022, #35 in FY2023, #71 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
69	Bundesministerium FUR Umwelt Naturschutz UND Reaktorsicherheit Through Bundesministerium FÜR Umwelt, Naturschutz UND Reaktorsicherheit Top agencies Army (Department of the Army)	$15,511,501	0.2%	Rank history: #33 in FY2022 and not on the FY2023–FY2025 lists; down 29 since FY2020.
70	Native Energy & Technology Inc. Top agencies DHS (Department of Homeland Security) DHA (Defense Health Agency) EPA (Environmental Protection Agency)	$15,430,438	0.2%	Rank history: not on the FY2022–FY2025 lists; down 32 since FY2020.
71	Welch Construction Inc. Top agencies VA (Department of Veterans Affairs)	$14,888,062	0.2%	Rank history: #36 in FY2022, #97 in FY2023, not on the FY2024 list and #96 in FY2025; up 274 since FY2020.
72	Afci-Cci JV One LLC Top agencies VA (Department of Veterans Affairs)	$14,789,676	0.2%	Rank history: not on the FY2022–FY2025 lists; up 260 since FY2020.
73	Web, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$14,706,476	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	MDM Construction LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$14,565,526	0.2%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; up 23 since FY2020.
75	Nelson Refrigeration Inc. Top agencies DECA (Defense Commissary Agency)	$14,555,216	0.2%	Rank history: #35 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; down 43 since FY2020.
76	Asturian Group, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$14,379,262	0.2%	Rank history: not on the FY2022–FY2025 lists; up 100 since FY2020.
77	JXR Constructors Inc. Top agencies VA (Department of Veterans Affairs)	$14,374,382	0.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
78	Sergents Mechanical Systems Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation)	$14,301,732	0.2%	Rank history: not on the FY2022–FY2024 lists and #56 in FY2025; new, not ranked in FY2020.
79	Structural Builders, Inc. Top agencies VA (Department of Veterans Affairs)	$14,177,507	0.2%	Rank history: not on the FY2022 list, #88 in FY2023 and not on the FY2024–FY2025 lists; up 74 since FY2020.
80	Wolf Creek Federal Services LLC Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$13,835,179	0.2%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
81	Bcss, LLC Top agencies DHS (Department of Homeland Security)	$13,709,802	0.2%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
82	Dumey Contracting Inc. Top agencies Army (Department of the Army)	$13,647,922	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Elektro-Krueck-Gmbh, Elektroinstallationen Top agencies Army (Department of the Army)	$13,510,808	0.2%	Rank history: not on the FY2022–FY2023 lists, #83 in FY2024 and #52 in FY2025; down 11 since FY2020.
84	Daniels Building Co Inc. Top agencies VA (Department of Veterans Affairs)	$13,489,475	0.2%	Rank history: #94 in FY2022, not on the FY2023–FY2024 lists and #77 in FY2025; up 10 since FY2020.
85	State of California Controllers Office Through Lcor Asset Management Limited Partnership Top agencies GSA (General Services Administration)	$13,365,481	0.2%	Rank history: #90 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
86	Belt Built CFM Construction Services JV, LLC Top agencies DOJ (Department of Justice)	$13,065,969	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Collins-Russell 8(A), Llc. Top agencies Army (Department of the Army)	$12,884,054	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	American Electric Power Company, Inc. Through Public Service Company of Oklahoma Top agencies Army (Department of the Army)	$12,875,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Nan Inc. Top agencies Army (Department of the Army)	$12,844,309	0.2%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
90	Medvolt Construction Services, LLC Top agencies Army (Department of the Army)	$12,814,238	0.2%	Rank history: not on the FY2022–FY2025 lists; up 267 since FY2020.
91	C Martin Co Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) EPA (Environmental Protection Agency)	$12,799,317	0.2%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
92	Aleut Field Services LLC Top agencies Army (Department of the Army)	$12,705,849	0.2%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
93	Hernandez Consulting Inc. Top agencies VA (Department of Veterans Affairs) DOS (Department of State) GSA (General Services Administration)	$12,658,362	0.2%	Rank history: not on the FY2022–FY2025 lists; up 98 since FY2020.
94	Koniag, Inc. Through Pacarctic, LLC Top agencies DOS (Department of State) GSA (General Services Administration)	$12,594,248	0.2%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
95	Versacon, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$12,527,468	0.2%	Rank history: not on the FY2022–FY2025 lists; up 119 since FY2020.
96	Tecc Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$12,485,474	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Environmental Chemical Corporation 3 awardees, including Ecco GMBH and Environmental Chemical Corporation Italy S.R.L. Top agencies Navy (Department of the Navy) Army (Department of the Army) DLA (Defense Logistics Agency)	$12,429,296	0.2%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; down 92 since FY2020.
98	Ajanta Consulting LLC Top agencies Army (Department of the Army)	$12,413,298	0.2%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 168 since FY2020.
99	Rq-Aecom JV Top agencies Army (Department of the Army)	$12,411,197	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Ohishi Construction Co. Ltd. Top agencies Navy (Department of the Navy)	$12,380,045	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 3,758 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC Z1

Code	Net obligations	Largest contractor
Z1DA Maintenance of Hospitals and Infirmaries	$912,392,279	J & J Maintenance Inc.
Z1JZ Maintenance of Miscellaneous Buildings	$807,553,021	Jacobs Engineering Group Inc.
Z1AA Maintenance of Office Buildings	$722,975,505	JE Dunn Construction Group Inc.
Z1AZ Maintenance of Other Administrative Facilities and Service Buildings	$504,653,443	Skookum Educational Programs
Z1PD Maintenance of Waste Treatment and Storage Facilities	$450,299,898	Amentum Services, Inc.
Z1KF Maintenance of Dredging Facilities	$308,100,771	Norfolk Dredging Company
Z1PZ Maintenance of Other Non-Building Facilities	$287,546,799	Jacobs Engineering Group Inc.
Z1QA Maintenance of Restoration of Real Property (Public or Private)	$286,434,909	Continental Heavy Civil Corp
Z1NA Maintenance of Fuel Supply Facilities	$210,224,222	Weston Solutions Holdings, Inc.
Z1LB Maintenance of Highways/Roads/Streets/Bridges/Railways	$199,786,861	Natives of Kodiak, Incorporated
Z1KB Maintenance of Canals	$155,401,907	The Dutra Group
Z1HB Maintenance of Government-Owned Government-Operated (Gogo) R&D Facilities	$109,467,082	General Dynamics Corporation
Z1FA Maintenance of Family Housing Facilities	$107,150,824	Chugach Alaska Corporation
Z1KA Maintenance of Dams	$89,411,536	Cycle Marine Group, Inc.
Z1NB Maintenance of Heating and Cooling Plants	$83,278,855	Hensel Phelps Construction Co
Z1FC Maintenance of Troop Housing Facilities	$68,915,441	JX Holdings Inc.
Z1BZ Maintenance of Other Airfield Structures	$61,538,424	B.l. Harbert Holdings, L.L.C.
Z1BG Maintenance of Electronic and Communications Facilities	$60,699,133	Amentum Services, Inc.
Z1NZ Maintenance of Other Utilities	$53,387,383	American Electric Power Company, Inc.
Z1BD Maintenance of Airport Runways and Taxiways	$50,698,165	PCI Aviation LLC
Z1BC Maintenance of Radar and Navigational Facilities	$47,140,253	Georgia TECH Research Corp
Z1EB Maintenance of Maintenance Buildings	$44,800,693	Ajanta Consulting LLC
Z1JA Maintenance of Museums and Exhibition Buildings	$35,048,355	Grunley Construction Co., Inc.
Z1DZ Maintenance of Other Hospital Buildings	$34,822,057	Advon Corporation
Z1DB Maintenance of Laboratories and Clinics	$32,919,291	C Martin Co Inc.
Z1PC Maintenance of Unimproved Real Property (Land)	$30,187,140	Dumey Contracting Inc.
Z1EZ Maintenance of Other Industrial Buildings	$28,436,716	IL Kwang E&C Co.,Ltd
Z1NE Maintenance of Water Supply Facilities	$28,171,434	Syblon-Reid Co.
Z1KZ Maintenance of Other Conservation and Development Facilities	$25,174,610	Texas Dewatering LLC
Z1CZ Maintenance of Other Educational Buildings	$19,279,052	Patricia I. Romero, Inc.
Z1PA Maintenance of Recreation Facilities (Non-Building)	$15,723,923	SES Civil and Environmental LLC
Z1ND Maintenance of Sewage and Waste Facilities	$14,622,817	Central Environmental Inc.
Z1GZ Maintenance of Other Warehouse Buildings	$14,032,409	Tribalco LLC
Z1BA Maintenance of Air Traffic Control Towers	$8,760,398	CMP Commercial Construction Inc.
Z1LZ Maintenance of Parking Facilities	$7,948,704	Semper TEK Inc.
Z1FD Maintenance of Dining Facilities	$7,531,359	American Engineering Corporation
Z1FB Maintenance of Recreational Buildings	$7,361,475	All American AA LLC
Z1FZ Maintenance of Other Residential Buildings	-$192,390,410	DGG Re Investments LLC

Show all 38

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 $6.67 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 PSC Z1 contractors in FY2021?

1. Amentum Services, Inc. ($462M), 2. Jacobs Engineering Group Inc. ($154M), 3. J & J Maintenance Inc. ($142M), 4. Hensel Phelps Construction Co ($115M), 5. EMCOR Group, Inc. ($100M), 6. Andritz AG ($96.6M), 7. The Dutra Group ($84.7M), 8. Continental Heavy Civil Corp ($77.8M), 9. Norfolk Dredging Company ($74.5M), 10. Weston Solutions Holdings, Inc. ($66M).

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