Top 100 Contractors in PSC Z1: Maintenance, Alteration, Repair Buildings, FY2023

Name: Top 100 Contractors in PSC Z1: Maintenance, Alteration, Repair Buildings, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 23% of FY2023 PSC Z1 contract dollars

Contract obligations: $8,264,630,610 Net of deobligations, by contracts coded PSC Z1 or a code under it
Contractors: 3,586 Parent companies with an obligation
Largest contractor: Amentum Services, Inc. $557 million, 6.4% 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 and URS Federal Services International, Inc. Top agencies DOE (Department of Energy) NASA (National Aeronautics and Space Administration) DTRA (Defense Threat Reduction Agency)	$557,063,142	6.4%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2024 and not on the FY2025 list; unchanged since FY2022.
2	ACS Actividades DE Construccion Y Servicios SA Through Turner Construction Company Top agencies Army (Department of the Army)	$388,960,120	4.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
3	J & J Maintenance Inc. 2 awardees, including J&J and Alms Mission Support Solutions, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) DECA (Defense Commissary Agency)	$196,132,294	2.2%	Rank history: #3 in FY2021, #2 in FY2022, #3 in FY2024 and #3 in FY2025; down 1 since FY2022.
4	Jacobs Engineering Group Inc. 6 awardees, including Amentum Technology, Inc., Jacobs Government Services Company and Jacobs Project Management Co Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) GAO (Government Accountability Office)	$178,619,788	2.0%	Rank history: #2 in FY2021, #3 in FY2022, #31 in FY2024 and not on the FY2025 list; down 1 since FY2022.
5	Great Lakes Dredge & Dock Corporation 2 awardees Top agencies Army (Department of the Army)	$177,628,044	2.0%	Rank history: #28 in FY2021, #4 in FY2022, #1 in FY2024 and #2 in FY2025; down 1 since FY2022.
6	Facility Services Management, Inc. 2 awardees, including FSI Construction, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$124,850,680	1.4%	Rank history: #24 in FY2021, #21 in FY2022, #6 in FY2024 and #12 in FY2025; up 15 since FY2022.
7	Norfolk Dredging Company Top agencies Army (Department of the Army) Navy (Department of the Navy)	$118,162,596	1.4%	Rank history: #9 in FY2021, #12 in FY2022, #63 in FY2024 and #10 in FY2025; up 5 since FY2022.
8	Aptim Federal Services LLC 2 awardees Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$81,852,146	0.9%	Rank history: #30 in FY2021, #10 in FY2022, #46 in FY2024 and not on the FY2025 list; up 2 since FY2022.
9	Union Station Venture, Ltd. Through Jones Lang Lasalle Americas, Inc. Top agencies GSA (General Services Administration) DECA (Defense Commissary Agency) DHS (Department of Homeland Security)	$79,976,488	0.9%	Rank history: #33 in FY2021, #13 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
10	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)	$77,265,948	0.9%	Rank history: #10 in FY2021, #11 in FY2022, #11 in FY2024 and #23 in FY2025; up 1 since FY2022.
11	Central Plateau Cleanup Company, LLC Top agencies DOE (Department of Energy)	$74,906,529	0.9%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
12	General Dynamics Corporation 4 awardees, including General Dynamics Mission Systems, Inc., General Dynamics Land Systems Inc. and General Dynamics Information Technology, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOT (Department of Transportation)	$72,595,768	0.8%	Rank history: #16 in FY2021, #5 in FY2022, #5 in FY2024 and #5 in FY2025; down 7 since FY2022.
13	Emcor Group Inc. Through Emcor Government Services, Inc. Top agencies DHA (Defense Health Agency) GSA (General Services Administration) GAO (Government Accountability Office)	$66,436,257	0.8%	Rank history: #5 in FY2021, #8 in FY2022, #22 in FY2024 and #25 in FY2025; down 5 since FY2022.
14	Marinex Construction Inc. Top agencies Army (Department of the Army)	$64,855,379	0.7%	Rank history: #44 in FY2021, #29 in FY2022, #40 in FY2024 and #63 in FY2025; up 15 since FY2022.
15	American Engineering Corporation 2 awardees, including Oshima Shokai Co., Ltd. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$60,818,808	0.7%	Rank history: #58 in FY2021, #17 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
16	Global Pacific Design Builders, LLC Top agencies Navy (Department of the Navy)	$57,450,892	0.7%	Rank history: not on the FY2021 list, #51 in FY2022, #52 in FY2024 and #33 in FY2025; up 35 since FY2022.
17	Pond Constructors Inc. Top agencies DLA (Defense Logistics Agency)	$57,252,711	0.7%	Rank history: #60 in FY2021, #22 in FY2022, #10 in FY2024 and #16 in FY2025; up 5 since FY2022.
18	Skookum Educational Programs Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) Army (Department of the Army)	$55,927,857	0.6%	Rank history: #21 in FY2021, #23 in FY2022, #42 in FY2024 and #65 in FY2025; up 5 since FY2022.
19	Chugach Alaska Corporation 5 awardees, including Wolf Creek Federal Services LLC, Chugach Consolidated Solutions, LLC and Chugach Solutions Enterprise, LLC Top agencies Army (Department of the Army) GSA (General Services Administration) Navy (Department of the Navy)	$55,093,859	0.6%	Rank history: #18 in FY2021, #16 in FY2022, #48 in FY2024 and not on the FY2025 list; down 3 since FY2022.
20	Professional Contract Services, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$54,563,557	0.6%	Rank history: #17 in FY2021, #14 in FY2022, #15 in FY2024 and #17 in FY2025; down 6 since FY2022.
21	Action Facilities Management Inc. 2 awardees, including Action Integrated Services LLC Top agencies DOJ (Department of Justice) GSA (General Services Administration) Army (Department of the Army)	$54,318,123	0.6%	Rank history: #46 in FY2021, #44 in FY2022, #14 in FY2024 and #9 in FY2025; up 23 since FY2022.
22	Callan Marine Ltd Top agencies Army (Department of the Army)	$53,778,587	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
23	Curtin Maritime Corp Top agencies Army (Department of the Army)	$53,648,314	0.6%	Rank history: not on the FY2021 list, #41 in FY2022, #64 in FY2024 and #6 in FY2025; up 18 since FY2022.
24	ESA South, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$52,810,915	0.6%	Rank history: not on the FY2021 list, #67 in FY2022 and not on the FY2024–FY2025 lists; up 43 since FY2022.
25	Slayden Constructors Inc Top agencies Army (Department of the Army)	$48,243,000	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
26	Akima Range Readiness Operations LLC Top agencies USAF (Department of the Air Force)	$48,084,769	0.6%	Rank history: not on the FY2021–FY2022 lists, #56 in FY2024 and not on the FY2025 list; new.
27	AC JV One LLC Top agencies VA (Department of Veterans Affairs)	$47,658,860	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 103 since FY2022.
28	NH1 JV Top agencies USAF (Department of the Air Force)	$46,661,484	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
29	Structsure Projects Inc. Top agencies DOT (Department of Transportation) Army (Department of the Army)	$45,595,728	0.5%	Rank history: not on the FY2021 list, #7 in FY2022 and not on the FY2024–FY2025 lists; down 22 since FY2022.
30	Cashman Dredging and Marine Contracting Co. LLC Top agencies Army (Department of the Army)	$45,230,610	0.5%	Rank history: not on the FY2021 list, #24 in FY2022, #44 in FY2024 and not on the FY2025 list; down 6 since FY2022.
31	The Dutra Group Top agencies Army (Department of the Army)	$43,530,640	0.5%	Rank history: #7 in FY2021, not on the FY2022 list, #87 in FY2024 and #30 in FY2025; returned.
32	Vectrus Systems Corporation Through V2X Systems LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DHA (Defense Health Agency)	$43,092,567	0.5%	Rank history: #31 in FY2021, #19 in FY2022, #73 in FY2024 and not on the FY2025 list; down 13 since FY2022.
33	Arctic Slope Regional Corporation 4 awardees, including Asrc Communications, Ltd., Asrc Federal Field Services, LLC and Asrc Builders LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$41,295,589	0.5%	Rank history: #12 in FY2021, #20 in FY2022, #7 in FY2024 and #4 in FY2025; down 13 since FY2022.
34	Valiant Integrated Services LLC Through Valiant Government Services LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$39,788,998	0.5%	Rank history: not on the FY2021–FY2022 lists, #30 in FY2024 and #39 in FY2025; new.
35	Louis Berger U.S. Inc. 3 awardees, including VGS Infrastructure Services Inc., VGS Aircraft Services, Inc. and The Louis Berger Group, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) GSA (General Services Administration)	$39,008,179	0.4%	Rank history: #68 in FY2021, #40 in FY2022, #71 in FY2024 and not on the FY2025 list; up 5 since FY2022.
36	Herman Construction Group, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHA (Defense Health Agency)	$38,958,298	0.4%	Rank history: #26 in FY2021, #42 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
37	Manson Construction Co. Top agencies Army (Department of the Army)	$37,971,777	0.4%	Rank history: #25 in FY2021, #26 in FY2022, #35 in FY2024 and #48 in FY2025; down 11 since FY2022.
38	Encore Dredging Founding Partners LLC Through Inland Dredging Company, L.L.C. Top agencies Army (Department of the Army)	$36,088,851	0.4%	Rank history: #20 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 260 since FY2022.
39	Tatitlek Corporation Through Tatitlek Technologies, LLC Top agencies DOS (Department of State)	$36,050,322	0.4%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2024 and #24 in FY2025; up 160 since FY2022.
40	South Dade Air Conditioning & Refrigeration Inc. Top agencies GSA (General Services Administration) USAF (Department of the Air Force) DOJ (Department of Justice)	$34,933,651	0.4%	Rank history: not on the FY2021 list, #64 in FY2022, #28 in FY2024 and #22 in FY2025; up 24 since FY2022.
41	Nelson Refrigeration Inc. Top agencies DECA (Defense Commissary Agency)	$34,802,475	0.4%	Rank history: #75 in FY2021, #35 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
42	Ross Group Construction Corporation, LLC Top agencies Army (Department of the Army)	$34,778,160	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
43	Nana Regional Corporation Inc. Through Jade Creek Construction LLC Top agencies DOJ (Department of Justice) GSA (General Services Administration)	$33,381,132	0.4%	Rank history: not on the FY2021–FY2022 lists, #16 in FY2024 and #11 in FY2025; new.
44	Koman Construction LLC Top agencies USAF (Department of the Air Force)	$32,946,906	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
45	Peter Kiewit Sons', Inc. 2 awardees, including Weeks Marine, Inc. Top agencies Army (Department of the Army)	$32,857,546	0.4%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2024 and #7 in FY2025; up 280 since FY2022.
46	Orion Marine Group Inc. 2 awardees, including Orion Construction, LLC and Orion Marine Construction, Inc. Top agencies Army (Department of the Army)	$32,719,426	0.4%	Rank history: #45 in FY2021, #38 in FY2022 and not on the FY2024–FY2025 lists; down 8 since FY2022.
47	Tetra Tech, Inc. 4 awardees, including Bluewater Federal Solutions, Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) Navy (Department of the Navy)	$31,329,456	0.4%	Rank history: not on the FY2021 list, #46 in FY2022, #13 in FY2024 and #43 in FY2025; down 1 since FY2022.
48	Jll-Midnight Sun Ifms LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$28,878,586	0.3%	Rank history: #35 in FY2021, #31 in FY2022, #39 in FY2024 and #36 in FY2025; down 17 since FY2022.
49	Thomco Enterprises Incorporated Top agencies Army (Department of the Army)	$28,091,903	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
50	Abhe & Svoboda, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$26,523,680	0.3%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2024 and not on the FY2025 list; new.
51	Tyonek Aircraft Overhaul, LLC Top agencies DHS (Department of Homeland Security)	$26,152,788	0.3%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2024 and not on the FY2025 list; up 430 since FY2022.
52	Rbvetco, LLC Top agencies VA (Department of Veterans Affairs)	$25,960,411	0.3%	Rank history: not on the FY2021–FY2022 lists, #32 in FY2024 and not on the FY2025 list; new.
53	CMI Management, LLC Top agencies HUD (Department of Housing and Urban Development) GSA (General Services Administration) Navy (Department of the Navy)	$25,679,107	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 293 since FY2022.
54	R.a. Burch Construction Co., Inc. Top agencies Navy (Department of the Navy)	$24,031,868	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
55	DB Netz AG Regionalnetz Oberpfalz Top agencies Army (Department of the Army)	$23,360,756	0.3%	Rank history: not on the FY2021 list, #57 in FY2022, #61 in FY2024 and #94 in FY2025; up 2 since FY2022.
56	Royce Construction Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$23,201,829	0.3%	Rank history: #63 in FY2021, #71 in FY2022, #77 in FY2024 and not on the FY2025 list; up 15 since FY2022.
57	Paramount Construction Group, LLC Top agencies VA (Department of Veterans Affairs)	$22,698,941	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 402 since FY2022.
58	Carrigg Commercial Builders LLC Top agencies VA (Department of Veterans Affairs)	$22,673,628	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 112 since FY2022.
59	SKE Technical Services GMBH 2 awardees, including SKE SRL Top agencies DODEA (Department of Defense Education Activity) Army (Department of the Army)	$22,523,465	0.3%	Rank history: #57 in FY2021, #49 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
60	Northern Management Services, Inc. Top agencies GSA (General Services Administration) DOI (Department of the Interior) DOJ (Department of Justice)	$22,446,071	0.3%	Rank history: not on the FY2021 list, #83 in FY2022, #69 in FY2024 and #61 in FY2025; up 23 since FY2022.
61	The Bedwell Company Top agencies DOI (Department of the Interior)	$22,264,373	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
62	Tlingit Haida Tribal Business Corporation 2 awardees, including T&H Services, LLC and Kira Aviation Services LLC Top agencies DOS (Department of State) Navy (Department of the Navy) USAF (Department of the Air Force)	$21,844,925	0.3%	Rank history: #51 in FY2021, #47 in FY2022 and not on the FY2024–FY2025 lists; down 15 since FY2022.
63	DAX / Gbab JV LLC Top agencies VA (Department of Veterans Affairs)	$21,824,692	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 378 since FY2022.
64	King & George, LLC 2 awardees, including Invicta Global, LLC Top agencies GSA (General Services Administration) Navy (Department of the Navy) Army (Department of the Army)	$21,256,075	0.2%	Rank history: #48 in FY2021, #37 in FY2022, #54 in FY2024 and #35 in FY2025; down 27 since FY2022.
65	The Povolny Group Inc. Top agencies VA (Department of Veterans Affairs)	$21,220,089	0.2%	Rank history: #42 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 333 since FY2022.
66	Mcmillen LLC Top agencies Army (Department of the Army)	$20,943,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
67	W.m. Schlosser Co., Inc. Top agencies Army (Department of the Army)	$20,777,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
68	Georgia TECH Research Corp Through Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force)	$20,592,314	0.2%	Rank history: #34 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 167 since FY2022.
69	U.s. Vet General Contracting, LLC Top agencies VA (Department of Veterans Affairs)	$20,561,281	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #70 in FY2025; up 140 since FY2022.
70	Veterans Northwest Construction LLC Top agencies Navy (Department of the Navy)	$20,177,103	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
71	Williams Building Company, Inc. Top agencies VA (Department of Veterans Affairs)	$20,121,616	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 379 since FY2022.
72	Cavu-Roncelli Construction Jv-10 LLC Top agencies VA (Department of Veterans Affairs)	$19,994,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
73	Fedcap Rehabilitation Services, Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$19,876,150	0.2%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2024 and #55 in FY2025; up 201 since FY2022.
74	District Veterans Contracting Inc. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security)	$19,861,284	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
75	Bristol Bay Native Corporation 4 awardees, including Specpro Environmental Services LLC and SES Infrastructure Services LLC Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$19,860,802	0.2%	Rank history: #64 in FY2021, #62 in FY2022, #47 in FY2024 and #31 in FY2025; down 13 since FY2022.
76	Bristol-Edt JV LLC Top agencies Army (Department of the Army)	$19,714,108	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
77	Four Seasons Environmental Inc. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) USDA (Department of Agriculture)	$19,577,097	0.2%	Rank history: not on the FY2021–FY2022 lists, #23 in FY2024 and not on the FY2025 list; new.
78	Stone & Lime Imports, Inc. Top agencies DOI (Department of the Interior)	$19,222,340	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
79	State of California Controllers Office Through Lcor Asset Management Limited Partnership Top agencies GSA (General Services Administration)	$19,220,030	0.2%	Rank history: #85 in FY2021, #90 in FY2022 and not on the FY2024–FY2025 lists; up 11 since FY2022.
80	Hensel Phelps - Shimizu JV Through Hensel Phelps Construction Co Top agencies Commerce (Department of Commerce)	$19,206,114	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
81	4K Global-Acc JV, LLC Top agencies Army (Department of the Army)	$19,173,486	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
82	Elektro-Kruck-GMBH Elektroinstallationen Through Elektro-Krueck-Gmbh, Elektroinstallationen Top agencies Army (Department of the Army)	$19,031,890	0.2%	Rank history: not on the FY2021 list, #78 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
83	Andritz AG Through Andritz Hydro Corp Top agencies DOI (Department of the Interior) Army (Department of the Army)	$18,966,543	0.2%	Rank history: #6 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 205 since FY2022.
84	Midwest Construction Co Top agencies Army (Department of the Army)	$18,945,865	0.2%	Rank history: #43 in FY2021, #55 in FY2022 and not on the FY2024–FY2025 lists; down 29 since FY2022.
85	Semper TEK Inc Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$18,638,254	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #44 in FY2025; up 390 since FY2022.
86	Natives of Kodiak, Incorporated Through Koman Construction, LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$18,534,234	0.2%	Rank history: #39 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 89 since FY2022.
87	The Chenega Corporation 4 awardees, including Chenega Facilities Management LLC, Chenega Tri-Services, LLC and Chenega Applied Solutions, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) Army (Department of the Army)	$18,531,138	0.2%	Rank history: #54 in FY2021, #54 in FY2022 and not on the FY2024–FY2025 lists; down 33 since FY2022.
88	Structural Builders, Inc. Top agencies VA (Department of Veterans Affairs)	$18,313,965	0.2%	Rank history: #79 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
89	Bering Straits Native Corporation 4 awardees, including Stampede Ventures, Inc., Arcticom, LLC and Bering Global Solutions, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) Navy (Department of the Navy)	$18,071,887	0.2%	Rank history: not on the FY2021 list, #45 in FY2022 and not on the FY2024–FY2025 lists; down 44 since FY2022.
90	Military & Federal Construction Co., Inc. Top agencies Navy (Department of the Navy)	$18,043,411	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
91	PAE Government Services Inc. 4 awardees, including Amentum Design and Facility Management, Amentum Spaceport LLC and Delta Bridge, Inc. Top agencies DOS (Department of State) Navy (Department of the Navy) USAF (Department of the Air Force)	$18,024,954	0.2%	Rank history: #62 in FY2021, #93 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
92	Sygnos Inc. Top agencies VA (Department of Veterans Affairs)	$17,884,228	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
93	Cottrell Contracting Corporation Top agencies Army (Department of the Army)	$17,808,644	0.2%	Rank history: #66 in FY2021, not on the FY2022 list, #24 in FY2024 and #20 in FY2025; up 14 since FY2022.
94	Tactical Infrastructure Maintenance Solutions LLC Top agencies DHS (Department of Homeland Security)	$17,728,167	0.2%	Rank history: #59 in FY2021, #70 in FY2022, #76 in FY2024 and #64 in FY2025; down 24 since FY2022.
95	SES Electrical LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$17,558,343	0.2%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2024 and not on the FY2025 list; up 42 since FY2022.
96	The Matthews Group Inc. Top agencies DOT (Department of Transportation)	$17,304,101	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #91 in FY2025; new.
97	Welch Construction Inc. Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration)	$17,281,708	0.2%	Rank history: #71 in FY2021, #36 in FY2022, not on the FY2024 list and #96 in FY2025; down 61 since FY2022.
98	Sandow Construction Inc. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) Treasury (Department of the Treasury)	$17,268,194	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
99	LB & B Associates Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$17,240,929	0.2%	Rank history: not on the FY2021 list, #77 in FY2022, #78 in FY2024 and #58 in FY2025; down 22 since FY2022.
100	Cypress-Sbs JV LLC Top agencies Army (Department of the Army)	$16,911,296	0.2%	Rank history: not on the FY2021 list, #99 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.

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100 of 3,586 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	$1,231,026,074	J & J Maintenance Inc.
Z1JZ Maintenance of Miscellaneous Buildings	$1,148,866,738	ACS Actividades DE Construccion Y Servicios SA
Z1AA Maintenance of Office Buildings	$1,090,718,892	Union Station Venture, Ltd.
Z1KF Maintenance of Dredging Facilities	$723,043,322	Great Lakes Dredge & Dock Corporation
Z1AZ Maintenance of Other Administrative Facilities and Service Buildings	$469,763,921	Skookum Educational Programs
Z1LB Maintenance of Highways/Roads/Streets/Bridges/Railways	$355,098,205	NH1 JV
Z1PZ Maintenance of Other Non-Building Facilities	$320,049,812	Jacobs Engineering Group Inc.
Z1NA Maintenance of Fuel Supply Facilities	$281,472,567	Aptim Federal Services LLC
Z1QA Maintenance of Restoration of Real Property (Public or Private)	$182,134,650	Akima Range Readiness Operations LLC
Z1FC Maintenance of Troop Housing Facilities	$180,280,775	Ross Group Construction Corporation, LLC
Z1FA Maintenance of Family Housing Facilities	$140,129,010	Global Pacific Design Builders, LLC
Z1KB Maintenance of Canals	$136,557,587	Great Lakes Dredge & Dock Corporation
Z1KA Maintenance of Dams	$136,073,565	Slayden Constructors Inc
Z1HB Maintenance of Government-Owned Government-Operated (Gogo) R&D Facilities	$116,655,661	General Dynamics Corporation
Z1BA Maintenance of Air Traffic Control Towers	$115,841,772	Structsure Projects Inc.
Z1DZ Maintenance of Other Hospital Buildings	$115,297,152	Professional Contract Services, Inc.
Z1BC Maintenance of Radar and Navigational Facilities	$83,077,458	Tyonek Aircraft Overhaul, LLC
Z1BG Maintenance of Electronic and Communications Facilities	$78,555,639	DB Netz AG Regionalnetz Oberpfalz
Z1BD Maintenance of Airport Runways and Taxiways	$76,903,182	Head, LLC
Z1EB Maintenance of Maintenance Buildings	$68,615,399	K & K Plus, Inc.
Z1NB Maintenance of Heating and Cooling Plants	$64,229,357	Nana Regional Corporation Inc.
Z1NZ Maintenance of Other Utilities	$57,363,197	Souza Construction, Inc.
Z1BZ Maintenance of Other Airfield Structures	$55,890,957	Nisou LGC JV II LLC
Z1EZ Maintenance of Other Industrial Buildings	$50,298,301	Mountain Point, LLC
Z1NE Maintenance of Water Supply Facilities	$40,877,019	W.m. Schlosser Co., Inc.
Z1CZ Maintenance of Other Educational Buildings	$36,069,271	R.a. Burch Construction Co., Inc.
Z1CA Maintenance of Schools	$35,705,845	SKE Technical Services GMBH
Z1DB Maintenance of Laboratories and Clinics	$35,382,286	Amentum Services, Inc.
Z1FB Maintenance of Recreational Buildings	$28,010,274	American Engineering Corporation
Z1JA Maintenance of Museums and Exhibition Buildings	$27,275,863	Huang-Cfm Joint Venture
Z1ND Maintenance of Sewage and Waste Facilities	$21,761,532	Nikken Sogyo Co., Ltd.
Z1LZ Maintenance of Parking Facilities	$19,551,664	Mig Gov, LLC
Z1PA Maintenance of Recreation Facilities (Non-Building)	$17,970,134	Kompan Holding GMBH
Z1GZ Maintenance of Other Warehouse Buildings	$11,934,475	Sanken Setsubi Kogyo Co., Ltd.
Z1AB Maintenance of Conference Space and Facilities	$6,713,477	Chenega Mission Operations, LLC
Z1FD Maintenance of Dining Facilities	$3,700,629	Bristol Prime Contractors, LLC
Z1FZ Maintenance of Other Residential Buildings	-$70,023,099	Legacy Joint Venture Group, LLC

Show all 37

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 $8.73 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 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 FY2023?

1. Amentum Services, Inc. ($557M), 2. ACS Actividades DE Construccion Y Servicios SA ($389M), 3. J & J Maintenance Inc. ($196M), 4. Jacobs Engineering Group Inc. ($179M), 5. Great Lakes Dredge & Dock Corporation ($178M), 6. Facility Services Management, Inc. ($125M), 7. Norfolk Dredging Company ($118M), 8. Aptim Federal Services LLC ($81.9M), 9. Union Station Venture, Ltd. ($80M), 10. Weston Solutions Holdings, Inc. ($77.3M).

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