Top 100 Contractors in PSC Z: Maintenance, Repair, Alteration Real Property, FY2024

Name: Top 100 Contractors in PSC Z: Maintenance, Repair, Alteration Real Property, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 12% of FY2024 PSC Z contract dollars

Contract obligations: $22,232,985,399 Net of deobligations, by contracts coded PSC Z or a code under it
Contractors: 6,555 Parent companies with an obligation
Largest contractor: Weston Solutions Holdings, Inc. $523 million, 2.2% 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	Weston Solutions Holdings, Inc. 3 awardees, including Weston Solutions Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$522,719,882	2.2%	Rank history: #16 in FY2021, #23 in FY2022, #1 in FY2023 and not on the FY2025 list; unchanged since FY2023.
2	Great Lakes Dredge & Dock Corporation Top agencies Army (Department of the Army)	$515,830,619	2.2%	Rank history: #47 in FY2021, #12 in FY2022, #10 in FY2023 and #4 in FY2025; up 8 since FY2023.
3	Amentum Services, Inc. 5 awardees, including Central Plateau Cleanup Company, LLC, URS Federal Services International, Inc. and PAE Government Services, Inc. Top agencies DOE (Department of Energy) DTRA (Defense Threat Reduction Agency) Navy (Department of the Navy)	$505,540,471	2.2%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2023 and not on the FY2025 list; down 1 since FY2023.
4	J & J Maintenance Inc. 3 awardees, including J&J and Alms Mission Support Solutions, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) Navy (Department of the Navy)	$251,745,824	1.1%	Rank history: #6 in FY2021, #3 in FY2022, #8 in FY2023 and #3 in FY2025; up 4 since FY2023.
5	Kgjj Engineering Solutions, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army) Navy (Department of the Navy)	$198,715,202	0.9%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 168 since FY2023.
6	Peter Kiewit Sons', Inc. 5 awardees, including Weeks Marine, Inc., Healy Tibbitts Builders, Inc. and Kiewit Infrastructure West Co Top agencies Army (Department of the Army) Navy (Department of the Navy)	$167,130,740	0.7%	Rank history: #36 in FY2021, not on the FY2022 list, #42 in FY2023 and #25 in FY2025; up 36 since FY2023.
7	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$163,379,975	0.7%	Rank history: not on the FY2021–FY2023 lists and #61 in FY2025; new.
8	Ferrovial Construccion PR, LLC Top agencies Army (Department of the Army)	$150,656,464	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
9	American Engineering Corporation 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$148,120,641	0.6%	Rank history: #15 in FY2021, #13 in FY2022, #11 in FY2023 and #15 in FY2025; up 2 since FY2023.
10	Arctic Slope Regional Corporation 8 awardees, including Asrc Federal Facilities Logistics LLC, Asrc Builders LLC and Netcentric Technology, LLC Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$140,253,588	0.6%	Rank history: #26 in FY2021, #67 in FY2022, #47 in FY2023 and #10 in FY2025; up 37 since FY2023.
11	AECOM Technical Services, Inc. Top agencies Navy (Department of the Navy) GSA (General Services Administration) USAF (Department of the Air Force)	$138,463,861	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
12	Grunley Construction Co., Inc. Top agencies Navy (Department of the Navy) Smithsonian (Smithsonian Institution) NARA (National Archives and Records Administration)	$131,682,939	0.6%	Rank history: #55 in FY2021, not on the FY2022 list, #14 in FY2023 and #88 in FY2025; up 2 since FY2023.
13	Manson Construction Co. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$123,427,321	0.5%	Rank history: #12 in FY2021, #17 in FY2022, #46 in FY2023 and not on the FY2025 list; up 33 since FY2023.
14	RQ Construction, LLC Top agencies Navy (Department of the Navy)	$117,691,372	0.5%	Rank history: not on the FY2021–FY2022 lists, #13 in FY2023 and #6 in FY2025; down 1 since FY2023.
15	General Dynamics Corporation 5 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) Navy (Department of the Navy)	$113,984,864	0.5%	Rank history: #39 in FY2021, #16 in FY2022, #28 in FY2023 and #13 in FY2025; up 13 since FY2023.
16	The Cianbro Companies Through Cianbro Corporation Top agencies Navy (Department of the Navy)	$113,703,667	0.5%	Rank history: #25 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
17	Callan Marine Limited Top agencies Army (Department of the Army)	$112,139,453	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
18	Consigli Holdings Inc. Through Consigli Construction Co., Inc. Top agencies Army (Department of the Army) GSA (General Services Administration) DOI (Department of the Interior)	$104,424,149	0.4%	Rank history: not on the FY2021 list, #61 in FY2022, #20 in FY2023 and not on the FY2025 list; up 2 since FY2023.
19	NW Construction, Inc. Top agencies DOI (Department of the Interior)	$101,597,818	0.4%	Rank history: not on the FY2021 list, #19 in FY2022, #56 in FY2023 and #8 in FY2025; up 37 since FY2023.
20	Facility Services Management, Inc. 2 awardees, including FSI Construction, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) Navy (Department of the Navy)	$99,055,798	0.4%	Rank history: #59 in FY2021, #70 in FY2022, #16 in FY2023 and #20 in FY2025; down 4 since FY2023.
21	Korte Construction Company Top agencies Army (Department of the Army) Navy (Department of the Navy)	$94,869,292	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
22	Jones Lang Lasalle Americas, Inc. 2 awardees, including Advanced Technologies Group Inc. Top agencies GSA (General Services Administration) DECA (Defense Commissary Agency) AOUSC (Administrative Office of the U.S. Courts)	$89,765,471	0.4%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2025; new.
23	The Whiting-Turner Contracting Company Top agencies Navy (Department of the Navy) USAID (US Agency for International Development) GSA (General Services Administration)	$84,415,984	0.4%	Rank history: #31 in FY2021, #26 in FY2022, #4 in FY2023 and #86 in FY2025; down 19 since FY2023.
24	Nana Regional Corporation Inc. 3 awardees, including Jade Creek Construction LLC, Akima Range Readiness Operations LLC and Sava Workforce Solutions LLC Top agencies USAF (Department of the Air Force) DOJ (Department of Justice) Navy (Department of the Navy)	$81,846,974	0.4%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and #91 in FY2025; up 75 since FY2023.
25	JE Dunn Construction Group Inc. Through J.e. Dunn Construction Company Top agencies GSA (General Services Administration) DHA (Defense Health Agency)	$81,135,502	0.3%	Rank history: #20 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 130 since FY2023.
26	Knight Const. & Supply Inc Top agencies Army (Department of the Army)	$80,966,725	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
27	Structsure Projects Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$79,653,184	0.3%	Rank history: not on the FY2021 list, #25 in FY2022, #6 in FY2023 and #17 in FY2025; down 21 since FY2023.
28	Jacobs Government Services Company 5 awardees, including Amentum Technology, Inc., Ch2M Hill Constructors, Inc. and Jacobs Engineering Group Inc. Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) GSA (General Services Administration)	$79,121,870	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
29	Aptim Federal Services LLC Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) Navy (Department of the Navy)	$78,965,043	0.3%	Rank history: #5 in FY2021, #7 in FY2022, #7 in FY2023 and not on the FY2025 list; down 22 since FY2023.
30	Pond Constructors Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) Navy (Department of the Navy)	$74,746,634	0.3%	Rank history: not on the FY2021 list, #54 in FY2022, #51 in FY2023 and #40 in FY2025; up 21 since FY2023.
31	Royce Construction Services, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army) USAF (Department of the Air Force)	$74,573,131	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 85 since FY2023.
32	Mvl-Bromgrove JV LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$74,379,295	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
33	Honeywell International Inc. 2 awardees, including Honeywell Building Solutions SES Corp Top agencies GSA (General Services Administration) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$70,904,921	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
34	Stronghold Engineering Inc. Top agencies Navy (Department of the Navy)	$68,227,128	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
35	CMS Corporation Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$67,007,108	0.3%	Rank history: #29 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 127 since FY2023.
36	WSP USA Environment & Infrastructure Inc. Top agencies DLA (Defense Logistics Agency) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$66,583,453	0.3%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; new.
37	Olgoonik Enterprises, LLC Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) Army (Department of the Army)	$63,976,670	0.3%	Rank history: not on the FY2021 list, #69 in FY2022, #26 in FY2023 and #34 in FY2025; down 11 since FY2023.
38	HHI Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Commerce (Department of Commerce)	$62,963,287	0.3%	Rank history: #63 in FY2021, #98 in FY2022, #25 in FY2023 and not on the FY2025 list; down 13 since FY2023.
39	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)	$62,779,962	0.3%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and #35 in FY2025; up 19 since FY2023.
40	Walsh Construction Company II, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$61,330,484	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
41	Pono Aina Management LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$60,918,121	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
42	Black Construction / Mace International Joint Venture Top agencies Navy (Department of the Navy)	$59,357,787	0.3%	Rank history: #77 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
43	Ironclad Services Inc Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) GSA (General Services Administration)	$58,643,339	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
44	SES Construction and Fuel Services LLC 3 awardees, including Specpro Environmental Services LLC and CCI Facility Support Services, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) DLA (Defense Logistics Agency)	$58,576,202	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
45	Chugach Alaska Corporation 5 awardees, including Chugach Consolidated Solutions, LLC, Wolf Creek Federal Services LLC and Defense Base Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) GSA (General Services Administration)	$58,107,775	0.2%	Rank history: #28 in FY2021, #49 in FY2022, #40 in FY2023 and not on the FY2025 list; down 5 since FY2023.
46	Hensel Phelps Construction Co 5 awardees, including Hensel Phelps Services LLC Top agencies Navy (Department of the Navy) Commerce (Department of Commerce) DOI (Department of the Interior)	$57,380,850	0.2%	Rank history: #4 in FY2021, #10 in FY2022, #50 in FY2023 and #29 in FY2025; up 4 since FY2023.
47	Silver Lake Construction LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$57,176,983	0.2%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and not on the FY2025 list; up 45 since FY2023.
48	Professional Contract Services, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DHS (Department of Homeland Security)	$55,928,233	0.2%	Rank history: #45 in FY2021, #46 in FY2022, #57 in FY2023 and #51 in FY2025; up 9 since FY2023.
49	Etolin Strait Development Group LLC 2 awardees, including Etolin Strait Partners, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$54,676,796	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
50	Atkins Nuclear Secured Holdings Corporation Through Isotek Systems, LLC Top agencies DOE (Department of Energy)	$54,220,295	0.2%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2025; new.
51	Bristol Bay Native Corporation 11 awardees, including Specpro Environmental Services LLC, Bristol General Contractors, LLC and Bristol Engineering Services Company, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) USAF (Department of the Air Force)	$54,093,334	0.2%	Rank history: #44 in FY2021, not on the FY2022 list, #53 in FY2023 and #72 in FY2025; up 2 since FY2023.
52	Watterson Construction Co Top agencies Army (Department of the Army)	$52,894,000	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
53	24 Asset Management Corp Top agencies HUD (Department of Housing and Urban Development)	$51,045,736	0.2%	Rank history: not on the FY2021 list, #52 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
54	Tatitlek Corporation Through Tatitlek Technologies, LLC Top agencies DOS (Department of State)	$50,922,918	0.2%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2025; up 53 since FY2023.
55	Amentum Holdings, Inc. 6 awardees, including Central Plateau Cleanup Company, LLC, PAE Government Services, Inc. and Amentum Services, Inc. Top agencies DOE (Department of Energy) Navy (Department of the Navy) DOS (Department of State)	$50,834,677	0.2%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2025; new.
56	Fluor Corporation 3 awardees, including Fluor Intercontinental, Inc. and Fluor Federal Solutions, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$50,025,089	0.2%	Rank history: not on the FY2021–FY2023 lists and #53 in FY2025; new.
57	Reyes Construction, Inc. Top agencies Navy (Department of the Navy)	$50,018,679	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
58	SU-MO Builders Inc. Top agencies Navy (Department of the Navy)	$49,849,074	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 286 since FY2023.
59	Tutor Perini Corporation 2 awardees, including Perini Management Services, Inc. Top agencies DOI (Department of the Interior) Navy (Department of the Navy)	$49,638,576	0.2%	Rank history: not on the FY2021–FY2022 lists, #30 in FY2023 and not on the FY2025 list; down 29 since FY2023.
60	South Dade Air Conditioning & Refrigeration Inc. Top agencies GSA (General Services Administration) Army (Department of the Army) USAF (Department of the Air Force)	$48,853,629	0.2%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and #50 in FY2025; up 40 since FY2023.
61	Blueway One JV LLC Top agencies VA (Department of Veterans Affairs)	$48,788,000	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
62	Reasor Building Group LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$48,233,631	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 213 since FY2023.
63	Armitage SAI JV Top agencies Army (Department of the Army) Navy (Department of the Navy)	$47,717,006	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 41 since FY2023.
64	Ross Group Construction Corporation, LLC Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) Army (Department of the Army)	$47,714,479	0.2%	Rank history: not on the FY2021–FY2022 lists, #35 in FY2023 and not on the FY2025 list; down 29 since FY2023.
65	Amentum Technology, Inc. Top agencies Navy (Department of the Navy)	$47,684,054	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
66	Waterfront Property Services, LLC Top agencies Army (Department of the Army)	$46,655,844	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
67	Emcor Group Inc. 3 awardees, including Emcor Government Services, Inc. and Mesa Energy Systems, Inc. Top agencies GSA (General Services Administration) GAO (Government Accountability Office) HHS (Department of Health and Human Services)	$46,060,553	0.2%	Rank history: not on the FY2021–FY2022 lists, #38 in FY2023 and #62 in FY2025; down 29 since FY2023.
68	Gsi-Pond JV LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$46,003,978	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 193 since FY2023.
69	Sedona-Nasco Jv2, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$45,922,396	0.2%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2025; up 282 since FY2023.
70	Roundhouse PBN - Tepa EC 2 Joint Venture Top agencies Army (Department of the Army)	$45,377,572	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
71	Sea PAC Engineering Inc Top agencies Navy (Department of the Navy) DOJ (Department of Justice) Army (Department of the Army)	$45,055,777	0.2%	Rank history: not on the FY2021–FY2023 lists and #14 in FY2025; up 30 since FY2023.
72	CM Construction Services, Inc. 2 awardees, including WJ Contracting - Cmcs JV Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$44,527,726	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 117 since FY2023.
73	Butt Construction Company, Incorporated Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$44,443,677	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 348 since FY2023.
74	Fargo Pacific Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$44,423,330	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 35 since FY2023.
75	4K Global-Acc JV, LLC Top agencies Army (Department of the Army)	$44,410,551	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 45 since FY2023.
76	Cottrell Contracting Corporation Top agencies Army (Department of the Army)	$44,057,557	0.2%	Rank history: not on the FY2021–FY2023 lists and #60 in FY2025; up 200 since FY2023.
77	Four Seasons Environmental Inc. Top agencies HHS (Department of Health and Human Services) GSA (General Services Administration) Navy (Department of the Navy)	$43,822,023	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 173 since FY2023.
78	Krbcfs-Maguire O'hara Joint Venture Top agencies USAF (Department of the Air Force)	$43,564,772	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
79	Gilbane Smcc ECC LLC Through Gilbane Federal JV Top agencies USAF (Department of the Air Force)	$42,913,416	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
80	Nelson Refrigeration Inc. Top agencies DECA (Defense Commissary Agency)	$42,779,232	0.2%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2025; new.
81	Peter Vander Werff Construction, Inc. Top agencies Navy (Department of the Navy)	$42,580,541	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 404 since FY2023.
82	Bering Straits Native Corporation 6 awardees, including Stampede Ventures, Inc. and Bering Global Solutions, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DOL (Department of Labor)	$41,512,652	0.2%	Rank history: #61 in FY2021, #51 in FY2022, #65 in FY2023 and #43 in FY2025; down 17 since FY2023.
83	Walsh Federal LLC Top agencies DOT (Department of Transportation)	$41,478,370	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
84	Potawatomi Defense Operations LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$40,900,792	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
85	Amcor JV One LLC Top agencies VA (Department of Veterans Affairs)	$40,810,000	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	North Wind General Contractors LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force) Army (Department of the Army)	$40,684,373	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
87	Doyon Management Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$40,441,100	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 292 since FY2023.
88	I.e.-Pacific, Inc. Top agencies Navy (Department of the Navy)	$40,210,407	0.2%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023 and not on the FY2025 list; down 8 since FY2023.
89	Jacobs Engineering Group Inc. 5 awardees, including Amentum Technology, Inc. and Jacobs Project Management Co. Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration) GSA (General Services Administration)	$39,855,298	0.2%	Rank history: #3 in FY2021, #6 in FY2022, #9 in FY2023 and not on the FY2025 list; down 80 since FY2023.
90	Midnight Sun-Centennial Kirratchiaq JV, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$39,700,049	0.2%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2023 and not on the FY2025 list; down 1 since FY2023.
91	Alltrack, Inc. Top agencies Army (Department of the Army)	$39,627,897	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
92	Richard Group LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$39,518,841	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
93	R.a. Burch Construction Co., Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$39,118,373	0.2%	Rank history: not on the FY2021–FY2022 lists, #24 in FY2023 and not on the FY2025 list; down 69 since FY2023.
94	Synergy Electric Company, Inc. Top agencies Navy (Department of the Navy)	$38,957,170	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
95	Kekolu Contracting, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$38,951,702	0.2%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2025; new.
96	Contrack ECC LLC Top agencies DLA (Defense Logistics Agency)	$38,845,779	0.2%	Rank history: not on the FY2021–FY2023 lists and #93 in FY2025; new.
97	Kekolu-Rio Vista Joint Venture, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$38,678,543	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 207 since FY2023.
98	Nan Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$38,659,302	0.2%	Rank history: not on the FY2021 list, #29 in FY2022, #63 in FY2023 and #7 in FY2025; down 35 since FY2023.
99	Shimmick Construction Company Inc. Top agencies Army (Department of the Army)	$38,458,676	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
100	Akima Facilities Operations LLC Top agencies Army (Department of the Army) DOE (Department of Energy) USDA (Department of Agriculture)	$38,328,662	0.2%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2025; new.

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100 of 6,555 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	$14,263,065,202	Weston Solutions Holdings, Inc.
Z1 Maintenance, Alteration, Repair Buildings	$7,969,920,197	Great Lakes Dredge & Dock Corporation

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 $23.3 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 FY2024?

1. Weston Solutions Holdings, Inc. ($523M), 2. Great Lakes Dredge & Dock Corporation ($516M), 3. Amentum Services, Inc. ($506M), 4. J & J Maintenance Inc. ($252M), 5. Kgjj Engineering Solutions, LLC ($199M), 6. Peter Kiewit Sons', Inc. ($167M), 7. Guidehouse Inc. ($163M), 8. Ferrovial Construccion PR, LLC ($151M), 9. American Engineering Corporation ($148M), 10. Arctic Slope Regional Corporation ($140M).

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