Top 100 Contractors in PSC Z: Maintenance, Repair, Alteration Real Property, FY2025

Name: Top 100 Contractors in PSC Z: Maintenance, Repair, Alteration Real Property, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 14% of FY2025 PSC Z contract dollars

Contract obligations: $21,535,360,600 Net of deobligations, by contracts coded PSC Z or a code under it
Contractors: 5,971 Parent companies with an obligation
Largest contractor: Amentum Holdings, Inc. $743 million, 3.2% 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. 10 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)	$742,908,367	3.2%	Rank history: not on the FY2021–FY2023 lists and #55 in FY2024; up 54 since FY2024.
2	Tpc-Nan A Joint Venture Top agencies Navy (Department of the Navy)	$576,073,022	2.5%	Rank history: not on the FY2021–FY2024 lists; new.
3	J & J Maintenance Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) DECA (Defense Commissary Agency)	$303,994,570	1.3%	Rank history: #6 in FY2021, #3 in FY2022, #8 in FY2023 and #4 in FY2024; up 1 since FY2024.
4	Great Lakes Dredge & Dock Corporation Top agencies Army (Department of the Army)	$285,735,309	1.2%	Rank history: #47 in FY2021, #12 in FY2022, #10 in FY2023 and #2 in FY2024; down 2 since FY2024.
5	BL Harbert International LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$262,496,501	1.1%	Rank history: not on the FY2021–FY2024 lists; new.
6	RQ Construction, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$249,242,373	1.1%	Rank history: not on the FY2021–FY2022 lists, #13 in FY2023 and #14 in FY2024; up 8 since FY2024.
7	Nan Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DLA (Defense Logistics Agency)	$242,045,003	1.1%	Rank history: not on the FY2021 list, #29 in FY2022, #63 in FY2023 and #98 in FY2024; up 91 since FY2024.
8	NW Construction, Inc. Top agencies DOI (Department of the Interior)	$225,853,813	1.0%	Rank history: not on the FY2021 list, #19 in FY2022, #56 in FY2023 and #19 in FY2024; up 11 since FY2024.
9	Kiewit-Alberici Siop Macc AJV Top agencies Navy (Department of the Navy)	$225,700,000	1.0%	Rank history: not on the FY2021–FY2022 lists, #5 in FY2023 and not on the FY2024 list; returned.
10	Arctic Slope Regional Corporation 12 awardees, including Asrc Federal Facilities Logistics LLC, Netcentric Technology, LLC and Asrc Earthworks, LLC Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration) DOI (Department of the Interior)	$153,298,707	0.7%	Rank history: #26 in FY2021, #67 in FY2022, #47 in FY2023 and #10 in FY2024; unchanged since FY2024.
11	Nippo Corporation Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$142,280,258	0.6%	Rank history: not on the FY2021–FY2024 lists; up 118 since FY2024.
12	Hawaii Harbors Constructors JV Top agencies Navy (Department of the Navy)	$136,343,281	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
13	General Dynamics Corporation 6 awardees, including General Dynamics Land Systems Inc., General Dynamics Mission Systems, Inc. and Electric Boat Corporation Top agencies Army (Department of the Army) DHS (Department of Homeland Security) Navy (Department of the Navy)	$134,735,113	0.6%	Rank history: #39 in FY2021, #16 in FY2022, #28 in FY2023 and #15 in FY2024; up 2 since FY2024.
14	Sea PAC Engineering Inc Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOJ (Department of Justice)	$125,993,474	0.5%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2024; up 57 since FY2024.
15	American Engineering Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DODEA (Department of Defense Education Activity)	$124,132,773	0.5%	Rank history: #15 in FY2021, #13 in FY2022, #11 in FY2023 and #9 in FY2024; down 6 since FY2024.
16	Sauer Construction LLC Top agencies Navy (Department of the Navy)	$124,035,819	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
17	Structsure Projects Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DHA (Defense Health Agency)	$117,585,166	0.5%	Rank history: not on the FY2021 list, #25 in FY2022, #6 in FY2023 and #27 in FY2024; up 10 since FY2024.
18	Weston Solutions Holdings Inc Through Weston Solutions Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) Army (Department of the Army)	$112,320,204	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
19	Ames Federal Contracting Group LLC Top agencies DOI (Department of the Interior)	$112,100,000	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
20	Facility Services Management, Inc. 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) DHA (Defense Health Agency)	$108,052,132	0.5%	Rank history: #59 in FY2021, #70 in FY2022, #16 in FY2023 and #20 in FY2024; unchanged since FY2024.
21	Curtin Maritime Corp Top agencies Army (Department of the Army) Navy (Department of the Navy)	$103,333,811	0.4%	Rank history: not on the FY2021–FY2022 lists, #60 in FY2023 and not on the FY2024 list; up 197 since FY2024.
22	Head / Diaz 2022 Top agencies Navy (Department of the Navy)	$101,154,199	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
23	Tutor Perini Corporation Through Perini Management Services, Inc. Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) Navy (Department of the Navy)	$100,616,606	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
24	Bridger Richard JV LLC Top agencies VA (Department of Veterans Affairs)	$94,279,424	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
25	Peter Kiewit Sons', Inc. 2 awardees, including Weeks Marine, Inc. and Kiewit Infrastructure South Co Top agencies Army (Department of the Army)	$88,942,634	0.4%	Rank history: #36 in FY2021, not on the FY2022 list, #42 in FY2023 and #6 in FY2024; down 19 since FY2024.
26	Barnard Construction Company, Incorporated Top agencies Army (Department of the Army) DOE (Department of Energy)	$87,922,159	0.4%	Rank history: not on the FY2021 list, #14 in FY2022 and not on the FY2023–FY2024 lists; up 147 since FY2024.
27	Hcpa-Garco JV1 Top agencies USAF (Department of the Air Force)	$85,650,000	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
28	V2X, Inc. 2 awardees, including Vectrus Federal Services GMBH and V2X Systems LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$83,514,534	0.4%	Rank history: not on the FY2021–FY2024 lists; up 433 since FY2024.
29	Hensel Phelps Construction Co 5 awardees, including Hensel Phelps Services LLC Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$79,463,804	0.3%	Rank history: #4 in FY2021, #10 in FY2022, #50 in FY2023 and #46 in FY2024; up 17 since FY2024.
30	Emr, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$79,132,185	0.3%	Rank history: not on the FY2021–FY2024 lists; up 159 since FY2024.
31	Honeywell International Inc. 4 awardees, including Honeywell Building Solutions SES Corp and Honeywell Aerospace International Inc. Top agencies GSA (General Services Administration) NARA (National Archives and Records Administration) USAF (Department of the Air Force)	$77,189,221	0.3%	Rank history: #27 in FY2021, #31 in FY2022, #37 in FY2023 and not on the FY2024 list; returned.
32	Jones Lang Lasalle Americas, Inc. Top agencies GSA (General Services Administration) DECA (Defense Commissary Agency) Treasury (Department of the Treasury)	$75,679,823	0.3%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; down 10 since FY2024.
33	Insight Pacific, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DLA (Defense Logistics Agency)	$71,574,696	0.3%	Rank history: not on the FY2021 list, #30 in FY2022, #72 in FY2023 and not on the FY2024 list; up 134 since FY2024.
34	Olgoonik Enterprises, LLC Top agencies USAF (Department of the Air Force) GSA (General Services Administration) Army (Department of the Army)	$71,257,083	0.3%	Rank history: not on the FY2021 list, #69 in FY2022, #26 in FY2023 and #37 in FY2024; up 3 since FY2024.
35	Action Facilities Management Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) Army (Department of the Army)	$69,981,575	0.3%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and #39 in FY2024; up 4 since FY2024.
36	Modern International Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$68,790,844	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
37	Clark Construction Group - California, LP Top agencies Navy (Department of the Navy)	$68,408,704	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
38	Norfolk Dredging Company Top agencies Army (Department of the Army)	$68,311,711	0.3%	Rank history: #22 in FY2021, #37 in FY2022, #19 in FY2023 and not on the FY2024 list; up 176 since FY2024.
39	Kekolu Contracting, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$66,924,815	0.3%	Rank history: not on the FY2021–FY2023 lists and #95 in FY2024; up 56 since FY2024.
40	Pond Constructors Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$66,068,638	0.3%	Rank history: not on the FY2021 list, #54 in FY2022, #51 in FY2023 and #30 in FY2024; down 10 since FY2024.
41	Amerifield JV LLC Top agencies VA (Department of Veterans Affairs)	$65,471,496	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
42	Cashman Dredging & Marine Contracting Co LLC Top agencies Army (Department of the Army)	$64,371,175	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
43	Bering Straits Native Corporation 2 awardees, including Stampede Ventures, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$63,041,511	0.3%	Rank history: #61 in FY2021, #51 in FY2022, #65 in FY2023 and #82 in FY2024; up 39 since FY2024.
44	Nelson Refrigeration Inc. Top agencies DECA (Defense Commissary Agency)	$62,965,353	0.3%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2024; up 36 since FY2024.
45	Donjon Marine Co., LLC Top agencies Army (Department of the Army)	$61,776,670	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
46	General Electric Company Through GE Renewables US LLC Top agencies Army (Department of the Army)	$60,436,934	0.3%	Rank history: not on the FY2021–FY2024 lists; up 76 since FY2024.
47	Dawson Enterprises, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$58,431,665	0.3%	Rank history: #53 in FY2021, #56 in FY2022, #76 in FY2023 and not on the FY2024 list; up 246 since FY2024.
48	Serviam Construction LLC Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency)	$57,900,215	0.3%	Rank history: not on the FY2021–FY2024 lists; up 64 since FY2024.
49	Mckenzie Construction & Site Development LLC Top agencies GSA (General Services Administration) USDA (Department of Agriculture) DOI (Department of the Interior)	$57,155,154	0.2%	Rank history: not on the FY2021–FY2024 lists; up 117 since FY2024.
50	South Dade Air Conditioning & Refrigeration Inc. Top agencies GSA (General Services Administration) Army (Department of the Army) AOUSC (Administrative Office of the U.S. Courts)	$56,989,007	0.2%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and #60 in FY2024; up 10 since FY2024.
51	Professional Contract Services, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DHS (Department of Homeland Security)	$56,939,672	0.2%	Rank history: #45 in FY2021, #46 in FY2022, #57 in FY2023 and #48 in FY2024; down 3 since FY2024.
52	Nova Group, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$56,532,969	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
53	Fluor Corporation 3 awardees, including Fluor Intercontinental, Inc. Top agencies USAF (Department of the Air Force)	$55,784,396	0.2%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2024; up 3 since FY2024.
54	Akima Facilities Operations LLC Top agencies Army (Department of the Army) DOE (Department of Energy)	$55,778,797	0.2%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 46 since FY2024.
55	Southeastern Industrial Barlovento JV Through Southeastern Industrial Barlovento Jv-2, LLC Top agencies Navy (Department of the Navy)	$55,254,644	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
56	Native American Services Corp. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$54,704,089	0.2%	Rank history: not on the FY2021–FY2024 lists; up 90 since FY2024.
57	Atkins Nuclear Secured Holdings Corporation Through Isotek Systems, LLC Top agencies DOE (Department of Energy)	$54,068,923	0.2%	Rank history: not on the FY2021–FY2023 lists and #50 in FY2024; down 7 since FY2024.
58	Semper TEK Inc Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) Army (Department of the Army)	$53,822,378	0.2%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023 and not on the FY2024 list; up 112 since FY2024.
59	Pegasus Support Services LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) GSA (General Services Administration)	$53,512,289	0.2%	Rank history: not on the FY2021–FY2024 lists; up 422 since FY2024.
60	Cottrell Contracting Corporation Top agencies Army (Department of the Army)	$53,312,374	0.2%	Rank history: not on the FY2021–FY2023 lists and #76 in FY2024; up 16 since FY2024.
61	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$52,999,025	0.2%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; down 54 since FY2024.
62	Emcor Group Inc. 4 awardees, including Emcor Government Services, Inc., Mesa Energy Systems, Inc. and Harry Pepper & Associates Inc. Top agencies GSA (General Services Administration) GAO (Government Accountability Office) HHS (Department of Health and Human Services)	$52,848,781	0.2%	Rank history: not on the FY2021–FY2022 lists, #38 in FY2023 and #67 in FY2024; up 5 since FY2024.
63	Etolin Strait Associates LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DHA (Defense Health Agency)	$51,959,256	0.2%	Rank history: not on the FY2021–FY2024 lists; up 175 since FY2024.
64	Sedona-Nasco Jv2, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$50,796,662	0.2%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2024; up 5 since FY2024.
65	WSP USA Environment & Infrastructure Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$50,331,714	0.2%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; down 29 since FY2024.
66	Tatitlek Corporation Through Tatitlek Technologies, LLC Top agencies DOS (Department of State)	$49,751,585	0.2%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2024; down 12 since FY2024.
67	Absher Construction Co 2 awardees, including Jabez-Absher Small Business Joint Venture Top agencies Navy (Department of the Navy) Army (Department of the Army)	$48,693,400	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
68	International Towers LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$48,168,743	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
69	Doyon Management Services, LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) Army (Department of the Army)	$48,075,714	0.2%	Rank history: not on the FY2021–FY2024 lists; up 103 since FY2024.
70	Murnane Building Contractors, Inc. Top agencies GSA (General Services Administration)	$47,195,000	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
71	Pacific Rim Constructors Inc. Top agencies USAF (Department of the Air Force)	$47,024,523	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
72	Bristol Bay Native Corporation 10 awardees, including Specpro Environmental Services LLC, Bristol Engineering Services Company, LLC and CCI General Contractors, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$46,402,464	0.2%	Rank history: #44 in FY2021, not on the FY2022 list, #53 in FY2023 and #51 in FY2024; down 21 since FY2024.
73	Infratech International, LLC Top agencies USAF (Department of the Air Force)	$44,979,140	0.2%	Rank history: not on the FY2021–FY2024 lists; up 106 since FY2024.
74	Serrano Construction and Development Corp. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$44,690,075	0.2%	Rank history: not on the FY2021–FY2024 lists; up 221 since FY2024.
75	SES Electrical LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$44,443,509	0.2%	Rank history: not on the FY2021 list, #94 in FY2022, #55 in FY2023 and not on the FY2024 list; up 128 since FY2024.
76	Swank Enterprises, Inc. Top agencies GSA (General Services Administration)	$44,289,144	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
77	Manson Construction Co Top agencies Army (Department of the Army) Navy (Department of the Navy)	$44,261,491	0.2%	Rank history: not on the FY2021–FY2024 lists; up 135 since FY2024.
78	Port Madison Construction Corporation Top agencies Navy (Department of the Navy)	$43,673,773	0.2%	Rank history: not on the FY2021–FY2024 lists; up 220 since FY2024.
79	Chickasaw Defense Group, LLC Top agencies Navy (Department of the Navy)	$43,497,604	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
80	Hurley JV, LLP Top agencies VA (Department of Veterans Affairs)	$43,319,739	0.2%	Rank history: not on the FY2021–FY2024 lists; up 117 since FY2024.
81	Benaka, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$42,949,723	0.2%	Rank history: not on the FY2021–FY2024 lists; up 325 since FY2024.
82	King & George, LLC Top agencies Army (Department of the Army) GSA (General Services Administration) Navy (Department of the Navy)	$42,841,744	0.2%	Rank history: #95 in FY2021, #73 in FY2022 and not on the FY2023–FY2024 lists; up 57 since FY2024.
83	Military & Federal Construction Co., Inc. Top agencies Navy (Department of the Navy)	$41,992,993	0.2%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023 and not on the FY2024 list; up 248 since FY2024.
84	Techni-Con, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$41,870,502	0.2%	Rank history: not on the FY2021–FY2024 lists; up 145 since FY2024.
85	Saw Greenland, LLC Top agencies VA (Department of Veterans Affairs)	$41,222,156	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
86	The Whiting-Turner Contracting Company Top agencies Navy (Department of the Navy) Commerce (Department of Commerce) GSA (General Services Administration)	$41,151,991	0.2%	Rank history: #31 in FY2021, #26 in FY2022, #4 in FY2023 and #23 in FY2024; down 63 since FY2024.
87	Lead Builders Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$40,750,766	0.2%	Rank history: not on the FY2021–FY2024 lists; up 123 since FY2024.
88	Grunley Construction Co., Inc. Top agencies Navy (Department of the Navy) Smithsonian (Smithsonian Institution) NARA (National Archives and Records Administration)	$40,633,323	0.2%	Rank history: #55 in FY2021, not on the FY2022 list, #14 in FY2023 and #12 in FY2024; down 76 since FY2024.
89	Onsite Construction Group LLC Top agencies VA (Department of Veterans Affairs)	$40,628,480	0.2%	Rank history: not on the FY2021–FY2024 lists; up 313 since FY2024.
90	Glen / Mar Construction, Inc. 2 awardees, including Glen Mar-Hensel Phelps Top agencies Navy (Department of the Navy) GSA (General Services Administration)	$40,544,951	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
91	Nana Regional Corporation Inc. 3 awardees, including Akima Range Readiness Operations LLC and Sava Workforce Solutions LLC Top agencies USAF (Department of the Air Force) DOJ (Department of Justice)	$40,287,995	0.2%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and #24 in FY2024; down 67 since FY2024.
92	The Dutra Group Top agencies Army (Department of the Army)	$39,713,703	0.2%	Rank history: #18 in FY2021, not on the FY2022 list, #85 in FY2023 and not on the FY2024 list; up 194 since FY2024.
93	Contrack ECC LLC Top agencies DLA (Defense Logistics Agency)	$39,603,284	0.2%	Rank history: not on the FY2021–FY2023 lists and #96 in FY2024; up 3 since FY2024.
94	Western Marine Construction, Inc. Top agencies Army (Department of the Army)	$39,297,000	0.2%	Rank history: not on the FY2021–FY2024 lists; up 94 since FY2024.
95	SKE & VFS JV Top agencies Army (Department of the Army)	$38,646,293	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
96	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)	$38,417,411	0.2%	Rank history: not on the FY2021–FY2024 lists; up 218 since FY2024.
97	Global Pacific Design Builders, LLC Top agencies Navy (Department of the Navy)	$38,311,584	0.2%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and not on the FY2024 list; up 88 since FY2024.
98	K'oyitl'ots'ina, Limited 3 awardees, including Yukon Fire Protection Services, Inc., Kcorp Support Services, Inc. and Kcorp Technology Services, Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$38,193,506	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
99	RHI LLC Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) Army (Department of the Army)	$37,660,578	0.2%	Rank history: not on the FY2021–FY2024 lists; up 350 since FY2024.
100	Elevated Technologies Services, LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) VA (Department of Veterans Affairs)	$37,317,923	0.2%	Rank history: not on the FY2021–FY2024 lists; up 378 since FY2024.

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100 of 5,971 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC Z

Code	Net obligations	Largest contractor
Z2 Maintenance, Alteration, Repair Nonbuildings	$14,250,173,788	Tpc-Nan A Joint Venture
Z1 Maintenance, Alteration, Repair Buildings	$7,285,193,922	Amentum Holdings, Inc.

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 $23 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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 Z contractors in FY2025?

1. Amentum Holdings, Inc. ($743M), 2. Tpc-Nan A Joint Venture ($576M), 3. J & J Maintenance Inc. ($304M), 4. Great Lakes Dredge & Dock Corporation ($286M), 5. BL Harbert International LLC ($262M), 6. RQ Construction, LLC ($249M), 7. Nan Inc. ($242M), 8. NW Construction, Inc. ($226M), 9. Kiewit-Alberici Siop Macc AJV ($226M), 10. Arctic Slope Regional Corporation ($153M).

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