Top 100 Contractors in PSC Z1: Maintenance, Alteration, Repair Buildings, Jul 2025–Jun 2026

Name: Top 100 Contractors in PSC Z1: Maintenance, Alteration, Repair Buildings, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 21% of PSC Z1 contract dollars from July 2025 through June 2026

Contract obligations: $8,137,206,954 Net of deobligations, by contracts coded PSC Z1 or a code under it
Contractors: 3,078 Parent companies with an obligation
Largest contractor: Amentum Holdings, Inc. $769 million, 8.8% 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 Holdings, Inc. 8 awardees, including Central Plateau Cleanup Company, LLC, Amentum Technology, Inc. and Amentum Services, Inc. Top agencies DOE (Department of Energy) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$768,516,178	8.8%	Rank history: not on the FY2021–FY2023 lists, #20 in FY2024 and #1 in FY2025; up 1 since Jul 2024–Jun 2025.
2	J & J Maintenance Inc. Top agencies Army (Department of the Army) DECA (Defense Commissary Agency) DHA (Defense Health Agency)	$184,062,138	2.1%	Rank history: #3 in FY2021, #2 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; up 1 since Jul 2024–Jun 2025.
3	Arctic Slope Regional Corporation 8 awardees, including Asrc Federal Facilities Logistics LLC, Netcentric Technology, LLC and Asrc Federal Cyber, LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$140,291,720	1.6%	Rank history: #12 in FY2021, #20 in FY2022, #33 in FY2023, #7 in FY2024 and #4 in FY2025; up 2 since Jul 2024–Jun 2025.
4	Peter Kiewit Sons', Inc. 2 awardees, including Weeks Marine, Inc. and Kiewit Infrastructure South Co Top agencies Army (Department of the Army)	$129,888,174	1.5%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023, #4 in FY2024 and #7 in FY2025; unchanged since Jul 2024–Jun 2025.
5	S & K Security Group LLC Top agencies DHS (Department of Homeland Security)	$114,653,121	1.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
6	Orion Marine Construction, Inc. Top agencies Army (Department of the Army)	$113,244,463	1.3%	Rank history: not on the FY2021–FY2023 lists, #62 in FY2024 and not on the FY2025 list; up 56 since Jul 2024–Jun 2025.
7	Fluor Corporation Through Fluor Intercontinental, Inc. Top agencies USAF (Department of the Air Force)	$111,100,000	1.3%	Rank history: not on the FY2021–FY2023 lists, #19 in FY2024 and #18 in FY2025; up 89 since Jul 2024–Jun 2025.
8	Great Lakes Dredge & Dock Corporation Top agencies Army (Department of the Army)	$96,895,589	1.1%	Rank history: #28 in FY2021, #4 in FY2022, #5 in FY2023, #1 in FY2024 and #2 in FY2025; down 7 since Jul 2024–Jun 2025.
9	General Dynamics Corporation 3 awardees, including General Dynamics Land Systems Inc. and General Dynamics Mission Systems, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$96,288,091	1.1%	Rank history: #16 in FY2021, #5 in FY2022, #12 in FY2023, #5 in FY2024 and #5 in FY2025; down 3 since Jul 2024–Jun 2025.
10	Curtin Maritime Corp Top agencies Army (Department of the Army) Navy (Department of the Navy)	$95,920,665	1.1%	Rank history: not on the FY2021 list, #41 in FY2022, #23 in FY2023, #64 in FY2024 and #6 in FY2025; up 2 since Jul 2024–Jun 2025.
11	Action Facilities Management Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) Army (Department of the Army)	$94,194,993	1.1%	Rank history: #46 in FY2021, #44 in FY2022, #21 in FY2023, #14 in FY2024 and #9 in FY2025; down 2 since Jul 2024–Jun 2025.
12	Donjon Marine Co., LLC Top agencies Army (Department of the Army)	$90,250,060	1.0%	Rank history: not on the FY2021–FY2024 lists and #15 in FY2025; new, not ranked in Jul 2024–Jun 2025.
13	Jones Lang Lasalle Americas, Inc. Top agencies GSA (General Services Administration) DECA (Defense Commissary Agency) DOT (Department of Transportation)	$83,471,449	1.0%	Rank history: not on the FY2021–FY2023 lists, #8 in FY2024 and #8 in FY2025; down 5 since Jul 2024–Jun 2025.
14	Pond Constructors Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$73,056,556	0.8%	Rank history: #60 in FY2021, #22 in FY2022, #17 in FY2023, #10 in FY2024 and #16 in FY2025; down 1 since Jul 2024–Jun 2025.
15	Facility Services Management, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) Navy (Department of the Navy)	$70,568,942	0.8%	Rank history: #24 in FY2021, #21 in FY2022, #6 in FY2023, #6 in FY2024 and #12 in FY2025; down 8 since Jul 2024–Jun 2025.
16	Alberici Constructors Inc Top agencies Army (Department of the Army)	$68,166,000	0.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
17	Emcor Group Inc. Through Emcor Government Services, Inc. Top agencies GSA (General Services Administration) GAO (Government Accountability Office) DOT (Department of Transportation)	$67,239,857	0.8%	Rank history: #5 in FY2021, #8 in FY2022, #13 in FY2023, #22 in FY2024 and #25 in FY2025; up 23 since Jul 2024–Jun 2025.
18	South Dade Air Conditioning & Refrigeration Inc. Top agencies GSA (General Services Administration) OPM (Office of Personnel Management) Army (Department of the Army)	$64,420,207	0.7%	Rank history: not on the FY2021 list, #64 in FY2022, #40 in FY2023, #28 in FY2024 and #22 in FY2025; up 2 since Jul 2024–Jun 2025.
19	Cottrell Contracting Corporation Top agencies Army (Department of the Army)	$64,364,097	0.7%	Rank history: #66 in FY2021, not on the FY2022 list, #93 in FY2023, #24 in FY2024 and #20 in FY2025; up 6 since Jul 2024–Jun 2025.
20	CCI Prime Contractors, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$58,925,566	0.7%	Rank history: not on the FY2021–FY2025 lists; up 450 since Jul 2024–Jun 2025.
21	Alutiiq Operations Services, LLC Top agencies USAF (Department of the Air Force) Treasury (Department of the Treasury) Navy (Department of the Navy)	$58,563,016	0.7%	Rank history: not on the FY2021–FY2025 lists; up 452 since Jul 2024–Jun 2025.
22	Pegasus Support Services LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) GSA (General Services Administration)	$57,840,660	0.7%	Rank history: not on the FY2021–FY2024 lists and #19 in FY2025; up 1 since Jul 2024–Jun 2025.
23	Weston Solutions Holdings Inc Through Weston Solutions Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$57,382,970	0.7%	Rank history: #10 in FY2021, #11 in FY2022, #10 in FY2023, #11 in FY2024 and #23 in FY2025; new, not ranked in Jul 2024–Jun 2025.
24	24 Asset Management Corp Top agencies HUD (Department of Housing and Urban Development)	$55,228,515	0.6%	Rank history: not on the FY2021 list, #15 in FY2022, not on the FY2023 list, #17 in FY2024 and not on the FY2025 list; up 326 since Jul 2024–Jun 2025.
25	Professional Contract Services, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DHA (Defense Health Agency)	$53,788,734	0.6%	Rank history: #17 in FY2021, #14 in FY2022, #20 in FY2023, #15 in FY2024 and #17 in FY2025; up 13 since Jul 2024–Jun 2025.
26	Pacific Design Builders, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$50,697,690	0.6%	Rank history: not on the FY2021–FY2025 lists; up 101 since Jul 2024–Jun 2025.
27	Akima Facilities Operations LLC Top agencies Army (Department of the Army) DOE (Department of Energy)	$47,423,252	0.5%	Rank history: not on the FY2021–FY2023 lists, #36 in FY2024 and #21 in FY2025; up 6 since Jul 2024–Jun 2025.
28	Bridger Richard JV LLC Top agencies VA (Department of Veterans Affairs)	$47,279,808	0.5%	Rank history: not on the FY2021–FY2024 lists and #26 in FY2025; new, not ranked in Jul 2024–Jun 2025.
29	Mike Hooks, LLC Top agencies Army (Department of the Army)	$46,753,639	0.5%	Rank history: not on the FY2021–FY2024 lists and #41 in FY2025; up 120 since Jul 2024–Jun 2025.
30	M.c. Dean, Inc. Top agencies GSA (General Services Administration) Army (Department of the Army) DISA (Defense Information Systems Agency)	$46,613,689	0.5%	Rank history: not on the FY2021 list, #75 in FY2022, not on the FY2023–FY2024 lists and #49 in FY2025; up 20 since Jul 2024–Jun 2025.
31	Valiant Integrated Services LLC 2 awardees, including Valiant Government Services LLC and Valiant / Alca JV LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) Navy (Department of the Navy)	$45,971,201	0.5%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023, #30 in FY2024 and #39 in FY2025; down 1 since Jul 2024–Jun 2025.
32	Inland Dredging Company, L.L.C. Top agencies Army (Department of the Army)	$45,912,492	0.5%	Rank history: not on the FY2021–FY2025 lists; up 358 since Jul 2024–Jun 2025.
33	Amerifield JV LLC Top agencies VA (Department of Veterans Affairs)	$45,603,496	0.5%	Rank history: not on the FY2021–FY2024 lists and #27 in FY2025; new, not ranked in Jul 2024–Jun 2025.
34	V2X, Inc. Through V2X Systems LLC Top agencies Navy (Department of the Navy)	$41,766,696	0.5%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; down 2 since Jul 2024–Jun 2025.
35	Tatitlek Corporation Through Tatitlek Technologies, LLC Top agencies DOS (Department of State)	$41,378,233	0.5%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023, #18 in FY2024 and #24 in FY2025; down 16 since Jul 2024–Jun 2025.
36	J&J and Alms Mission Support Solutions, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DHA (Defense Health Agency)	$41,194,166	0.5%	Rank history: not on the FY2021–FY2023 lists, #96 in FY2024 and #32 in FY2025; down 7 since Jul 2024–Jun 2025.
37	Norfolk Dredging Company Top agencies Army (Department of the Army)	$40,037,869	0.5%	Rank history: #9 in FY2021, #12 in FY2022, #7 in FY2023, #63 in FY2024 and #10 in FY2025; down 22 since Jul 2024–Jun 2025.
38	Lockheed Martin Corporation Top agencies USAF (Department of the Air Force)	$39,092,647	0.4%	Rank history: not on the FY2021–FY2024 lists and #42 in FY2025; up 40 since Jul 2024–Jun 2025.
39	Hospital Housekeeping Systems LLC Top agencies Army (Department of the Army)	$38,087,196	0.4%	Rank history: not on the FY2021–FY2024 lists and #37 in FY2025; up 76 since Jul 2024–Jun 2025.
40	Pundir Group, Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) VA (Department of Veterans Affairs)	$37,722,522	0.4%	Rank history: not on the FY2021–FY2023 lists, #74 in FY2024 and #50 in FY2025; up 12 since Jul 2024–Jun 2025.
41	Nelson Refrigeration Inc. Top agencies DECA (Defense Commissary Agency)	$36,114,784	0.4%	Rank history: not on the FY2021–FY2023 lists, #25 in FY2024 and #14 in FY2025; down 31 since Jul 2024–Jun 2025.
42	Jll-Midnight Sun Ifms LLC Top agencies Navy (Department of the Navy) DHA (Defense Health Agency)	$34,993,858	0.4%	Rank history: #35 in FY2021, #31 in FY2022, #48 in FY2023, #39 in FY2024 and #36 in FY2025; down 1 since Jul 2024–Jun 2025.
43	King & George, LLC Top agencies Army (Department of the Army) GSA (General Services Administration) Navy (Department of the Navy)	$34,957,221	0.4%	Rank history: #48 in FY2021, #37 in FY2022, #64 in FY2023, #54 in FY2024 and #35 in FY2025; up 37 since Jul 2024–Jun 2025.
44	Alutiiq Information Management, LLC Top agencies DOS (Department of State)	$34,682,000	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
45	Nana Regional Corporation, Inc. 3 awardees, including Akima Facilities Operations LLC and Akima Range Readiness Operations LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOE (Department of Energy)	$34,465,645	0.4%	Rank history: not on the FY2021–FY2022 lists, #43 in FY2023, #16 in FY2024 and #11 in FY2025; up 105 since Jul 2024–Jun 2025.
46	The Dutra Group Top agencies Army (Department of the Army)	$34,186,094	0.4%	Rank history: #7 in FY2021, not on the FY2022 list, #31 in FY2023, #87 in FY2024 and #30 in FY2025; up 10 since Jul 2024–Jun 2025.
47	Tetra Tech, Inc. 5 awardees, including Bluewater Federal Solutions, Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$34,011,388	0.4%	Rank history: not on the FY2021 list, #46 in FY2022, #47 in FY2023, #13 in FY2024 and #43 in FY2025; down 12 since Jul 2024–Jun 2025.
48	Birmingham Industrial Construction, LLC Top agencies VA (Department of Veterans Affairs)	$33,445,848	0.4%	Rank history: not on the FY2021–FY2023 lists, #86 in FY2024 and #38 in FY2025; up 170 since Jul 2024–Jun 2025.
49	K'oyitl'ots'ina, Limited 3 awardees, including Yukon Fire Protection Services, Inc. and Kcorp Technology Services, Inc. Top agencies GSA (General Services Administration) USAF (Department of the Air Force) AOUSC (Administrative Office of the U.S. Courts)	$31,300,092	0.4%	Rank history: not on the FY2021–FY2024 lists and #47 in FY2025; up 370 since Jul 2024–Jun 2025.
50	Cashman Dredging & Marine Contracting Co LLC Top agencies Army (Department of the Army)	$30,539,529	0.4%	Rank history: not on the FY2021–FY2024 lists and #13 in FY2025; down 16 since Jul 2024–Jun 2025.
51	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies Army (Department of the Army)	$30,188,120	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
52	Skookum Educational Programs Top agencies Army (Department of the Army) DHS (Department of Homeland Security) Navy (Department of the Navy)	$29,611,969	0.3%	Rank history: #21 in FY2021, #23 in FY2022, #18 in FY2023, #42 in FY2024 and #65 in FY2025; up 15 since Jul 2024–Jun 2025.
53	Nve, Inc. Top agencies Treasury (Department of the Treasury) USDA (Department of Agriculture) USAF (Department of the Air Force)	$28,811,884	0.3%	Rank history: not on the FY2021–FY2023 lists, #65 in FY2024 and #68 in FY2025; up 4 since Jul 2024–Jun 2025.
54	J G M Property Group, Inc. Top agencies HUD (Department of Housing and Urban Development)	$28,211,299	0.3%	Rank history: not on the FY2021 list, #30 in FY2022, not on the FY2023 list, #38 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
55	Sawtooth Construction JV II LLC Top agencies VA (Department of Veterans Affairs)	$28,008,865	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
56	Tyonek Aircraft Overhaul, LLC Top agencies DHS (Department of Homeland Security)	$27,702,839	0.3%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2023, #82 in FY2024 and not on the FY2025 list; up 9 since Jul 2024–Jun 2025.
57	Koman Construction, LLC Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$26,717,616	0.3%	Rank history: not on the FY2021 list, #95 in FY2022, not on the FY2023 list, #85 in FY2024 and #45 in FY2025; up 103 since Jul 2024–Jun 2025.
58	LB & B Associates Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$24,362,625	0.3%	Rank history: not on the FY2021 list, #77 in FY2022, #99 in FY2023, #78 in FY2024 and #58 in FY2025; up 16 since Jul 2024–Jun 2025.
59	Northern Management Services, Inc. Top agencies GSA (General Services Administration) DOS (Department of State) DOJ (Department of Justice)	$23,365,808	0.3%	Rank history: not on the FY2021 list, #83 in FY2022, #60 in FY2023, #69 in FY2024 and #61 in FY2025; up 10 since Jul 2024–Jun 2025.
60	SNC Tallimat, LLC Top agencies Army (Department of the Army)	$23,177,310	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
61	V Line Services L.L.C. Top agencies VA (Department of Veterans Affairs)	$23,087,400	0.3%	Rank history: not on the FY2021–FY2024 lists and #53 in FY2025; new, not ranked in Jul 2024–Jun 2025.
62	Red Eagle 3 JV Top agencies Army (Department of the Army)	$22,859,800	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
63	Andercorp LLC Top agencies Treasury (Department of the Treasury)	$22,791,582	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
64	Mckenzie Construction & Site Development LLC Top agencies DOT (Department of Transportation) DOI (Department of the Interior) USDA (Department of Agriculture)	$22,343,197	0.3%	Rank history: not on the FY2021–FY2024 lists and #51 in FY2025; up 306 since Jul 2024–Jun 2025.
65	Overwatch Amoroso LLC Top agencies VA (Department of Veterans Affairs)	$22,191,000	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
66	Southwind Construction Corp. Top agencies Army (Department of the Army)	$22,023,809	0.3%	Rank history: not on the FY2021–FY2024 lists and #46 in FY2025; up 150 since Jul 2024–Jun 2025.
67	Riley Contracting Group Inc. Top agencies VA (Department of Veterans Affairs)	$21,716,467	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
68	CAS FSE JV II LLC Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services) DLA (Defense Logistics Agency)	$21,650,042	0.2%	Rank history: not on the FY2021–FY2024 lists and #81 in FY2025; up 36 since Jul 2024–Jun 2025.
69	Ohishi Construction Co. Ltd Top agencies Navy (Department of the Navy)	$21,445,766	0.2%	Rank history: not on the FY2021–FY2024 lists and #57 in FY2025; new, not ranked in Jul 2024–Jun 2025.
70	Tbp&Jj Worldwide Services, LLC Top agencies DOT (Department of Transportation)	$21,143,594	0.2%	Rank history: not on the FY2021–FY2025 lists; up 168 since Jul 2024–Jun 2025.
71	Callan Marine Limited Top agencies Army (Department of the Army)	$20,974,144	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
72	Serviam Construction LLC Top agencies VA (Department of Veterans Affairs)	$20,960,187	0.2%	Rank history: not on the FY2021–FY2023 lists, #33 in FY2024 and #29 in FY2025; down 61 since Jul 2024–Jun 2025.
73	Native Star Group, Inc. Top agencies USAF (Department of the Air Force)	$20,653,115	0.2%	Rank history: not on the FY2021–FY2025 lists; up 303 since Jul 2024–Jun 2025.
74	Global Systemized Industry Top agencies USAF (Department of the Air Force)	$20,300,198	0.2%	Rank history: not on the FY2021–FY2024 lists and #88 in FY2025; up 119 since Jul 2024–Jun 2025.
75	Kekolu Contracting, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$19,573,804	0.2%	Rank history: not on the FY2021–FY2024 lists and #66 in FY2025; up 162 since Jul 2024–Jun 2025.
76	Tactical Infrastructure Maintenance Solutions LLC Top agencies DHS (Department of Homeland Security)	$19,285,586	0.2%	Rank history: #59 in FY2021, #70 in FY2022, #94 in FY2023, #76 in FY2024 and #64 in FY2025; down 13 since Jul 2024–Jun 2025.
77	Katmai Integrated Solutions, LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) HUD (Department of Housing and Urban Development)	$19,238,970	0.2%	Rank history: not on the FY2021–FY2025 lists; up 383 since Jul 2024–Jun 2025.
78	CJW Contractors, Inc. Top agencies Navy (Department of the Navy)	$18,770,852	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
79	T&H Services, LLC Top agencies DOS (Department of State) Navy (Department of the Navy) DFAS (Defense Finance and Accounting Service)	$18,271,975	0.2%	Rank history: not on the FY2021–FY2024 lists and #71 in FY2025; down 19 since Jul 2024–Jun 2025.
80	Yojin Construction & Engineering Co., Ltd. Top agencies Army (Department of the Army)	$17,977,093	0.2%	Rank history: not on the FY2021–FY2025 lists; up 26 since Jul 2024–Jun 2025.
81	KTH Services JV, LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$17,781,147	0.2%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; up 54 since Jul 2024–Jun 2025.
82	Government Contracting Resources, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$17,500,128	0.2%	Rank history: not on the FY2021–FY2023 lists, #95 in FY2024 and #98 in FY2025; up 40 since Jul 2024–Jun 2025.
83	Raven Services JV LLC 2 awardees, including Raven Services Corp Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$17,500,032	0.2%	Rank history: not on the FY2021–FY2025 lists; up 38 since Jul 2024–Jun 2025.
84	Journey Construction, Inc. Top agencies USAF (Department of the Air Force)	$17,418,575	0.2%	Rank history: not on the FY2021–FY2025 lists; up 296 since Jul 2024–Jun 2025.
85	R-Con Construction Inc. Top agencies USAF (Department of the Air Force)	$17,417,402	0.2%	Rank history: not on the FY2021 list, #43 in FY2022, not on the FY2023 list, #84 in FY2024 and not on the FY2025 list; up 43 since Jul 2024–Jun 2025.
86	Rock Construction Management LLC Top agencies VA (Department of Veterans Affairs)	$17,185,758	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
87	Union Paving & Construction Co Top agencies Navy (Department of the Navy)	$17,154,700	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
88	Allison Park Contractors, Inc. Top agencies Army (Department of the Army)	$17,055,100	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
89	DAE Sung LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) HHS (Department of Health and Human Services)	$16,996,515	0.2%	Rank history: not on the FY2021–FY2023 lists, #99 in FY2024 and #100 in FY2025; up 4 since Jul 2024–Jun 2025.
90	VGS Infrastructure Services Inc. Top agencies DLA (Defense Logistics Agency)	$16,933,539	0.2%	Rank history: not on the FY2021–FY2023 lists, #41 in FY2024 and not on the FY2025 list; down 43 since Jul 2024–Jun 2025.
91	Daniels Building Co Inc. Top agencies VA (Department of Veterans Affairs)	$16,734,634	0.2%	Rank history: #84 in FY2021, #94 in FY2022, not on the FY2023–FY2024 lists and #77 in FY2025; new, not ranked in Jul 2024–Jun 2025.
92	SKE Technical Services GMBH Top agencies DODEA (Department of Defense Education Activity) DECA (Defense Commissary Agency)	$16,508,605	0.2%	Rank history: not on the FY2021–FY2024 lists and #78 in FY2025; down 17 since Jul 2024–Jun 2025.
93	RBA Engineering International, PLLC Top agencies DOI (Department of the Interior)	$16,197,004	0.2%	Rank history: not on the FY2021–FY2024 lists and #79 in FY2025; new, not ranked in Jul 2024–Jun 2025.
94	Michels Construction, Inc. Top agencies DOI (Department of the Interior)	$16,131,236	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
95	KAR Contracting LLC Top agencies VA (Department of Veterans Affairs)	$15,862,945	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
96	Pedersen & Rangel Top agencies VA (Department of Veterans Affairs)	$15,850,000	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
97	Maverick Constructors, LLC Top agencies Army (Department of the Army)	$15,508,744	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
98	Semper TEK Inc Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$15,397,342	0.2%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2023, not on the FY2024 list and #44 in FY2025; down 50 since Jul 2024–Jun 2025.
99	Amvet Ritz JV LLC Top agencies VA (Department of Veterans Affairs)	$15,375,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #80 in FY2025; new, not ranked in Jul 2024–Jun 2025.
100	GKG Contractors LLC Top agencies Navy (Department of the Navy)	$15,280,870	0.2%	Rank history: not on the FY2021–FY2025 lists; up 236 since Jul 2024–Jun 2025.

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100 of 3,078 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	$1,255,621,961	J & J Maintenance Inc.
Z1AA Maintenance of Office Buildings	$1,240,575,631	Action Facilities Management Inc.
Z1JZ Maintenance of Miscellaneous Buildings	$697,579,428	Amentum Holdings, Inc.
Z1KF Maintenance of Dredging Facilities	$678,589,762	Great Lakes Dredge & Dock Corporation
Z1AZ Maintenance of Other Administrative Facilities and Service Buildings	$507,161,495	Arctic Slope Regional Corporation
Z1PZ Maintenance of Other Non-Building Facilities	$325,478,043	Amentum Holdings, Inc.
Z1KB Maintenance of Canals	$323,845,694	Orion Marine Construction, Inc.
Z1LB Maintenance of Highways/Roads/Streets/Bridges/Railways	$276,653,887	Koman Construction, LLC
Z1NA Maintenance of Fuel Supply Facilities	$226,961,313	Pond Constructors Inc.
Z1BC Maintenance of Radar and Navigational Facilities	$206,609,410	S & K Security Group LLC
Z1QA Maintenance of Restoration of Real Property (Public or Private)	$172,020,043	Alutiiq Operations Services, LLC
Z1KA Maintenance of Dams	$164,748,444	Alberici Constructors Inc
Z1BD Maintenance of Airport Runways and Taxiways	$163,620,561	Fluor Corporation
Z1FA Maintenance of Family Housing Facilities	$143,548,962	Pacific Design Builders, LLC
Z1HB Maintenance of Government-Owned Government-Operated (Gogo) R&D Facilities	$143,269,663	Arctic Slope Regional Corporation
Z1FC Maintenance of Troop Housing Facilities	$109,614,380	CJW Contractors, Inc.
Z1DZ Maintenance of Other Hospital Buildings	$98,925,695	Birmingham Industrial Construction, LLC
Z1FZ Maintenance of Other Residential Buildings	$82,799,232	24 Asset Management Corp
Z1NE Maintenance of Water Supply Facilities	$62,346,261	Red Eagle 3 JV
Z1DB Maintenance of Laboratories and Clinics	$61,529,034	Valiant Integrated Services LLC
Z1BA Maintenance of Air Traffic Control Towers	$57,323,665	E Corp
Z1CA Maintenance of Schools	$52,160,471	SKE Technical Services GMBH
Z1EB Maintenance of Maintenance Buildings	$47,301,834	Enviremedial Services, Inc.
Z1NZ Maintenance of Other Utilities	$34,082,732	Advanced Management Group L.L.C.
Z1NB Maintenance of Heating and Cooling Plants	$33,460,291	Qcm, Inc.
Z1ND Maintenance of Sewage and Waste Facilities	$28,367,383	Fedvet Construction
Z1BG Maintenance of Electronic and Communications Facilities	$27,797,155	Armitage SAI JV
Z1EZ Maintenance of Other Industrial Buildings	$25,017,260	Gracen Engineering & Construction Inc.
Z1PA Maintenance of Recreation Facilities (Non-Building)	$23,031,373	K.w. Emerson, Inc.
Z1BZ Maintenance of Other Airfield Structures	$19,607,874	Mckenzie Construction & Site Development LLC
Z1JA Maintenance of Museums and Exhibition Buildings	$17,826,323	Constructora Rogers, S.A. (Conrosa)
Z1FB Maintenance of Recreational Buildings	$14,910,696	Sentinel Builders, LLC
Z1LZ Maintenance of Parking Facilities	$12,923,592	Construction Partners, Inc.
Z1FD Maintenance of Dining Facilities	$3,386,531	Hapec Co., Ltd.
Z1FF Maintenance of Penal Facilities	$1,486,328	Redtown Technical Services, LLC

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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 $8.71 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 Jul 2025–Jun 2026?

1. Amentum Holdings, Inc. ($769M), 2. J & J Maintenance Inc. ($184M), 3. Arctic Slope Regional Corporation ($140M), 4. Peter Kiewit Sons', Inc. ($130M), 5. S & K Security Group LLC ($115M), 6. Orion Marine Construction, Inc. ($113M), 7. Fluor Corporation ($111M), 8. Great Lakes Dredge & Dock Corporation ($96.9M), 9. General Dynamics Corporation ($96.3M), 10. Curtin Maritime Corp ($95.9M).

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