Top 100 Contractors in PSC F108: Hazardous Substance Removal, Cleanup, and Disposal Services and Operational Support, FY2025

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$289,456,116	11.9%	Rank history: not on the FY2021–FY2023 lists and #2 in FY2024; up 1 since FY2024.
2	Bechtel Corp Through Bechtel National, Inc. Top agencies Army (Department of the Army)	$237,713,874	9.7%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2024; down 1 since FY2024.
3	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$162,200,267	6.6%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2023 and #3 in FY2024; unchanged since FY2024.
4	Arctic Slope Regional Corporation 5 awardees, including Environmental Quality Management, Inc., EQM Services, LLC and EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$141,529,066	5.8%	Rank history: #9 in FY2021, #27 in FY2022, #6 in FY2023 and #27 in FY2024; up 23 since FY2024.
5	Ciri Development Corporation 7 awardees, including North Wind Portage, Inc., North Wind Site Services, LLC and North Wind General Contractors LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOI (Department of the Interior)	$106,466,093	4.4%	Rank history: not on the FY2021–FY2022 lists, #70 in FY2023 and not on the FY2024 list; up 116 since FY2024.
6	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice) Army (Department of the Army)	$103,016,896	4.2%	Rank history: #3 in FY2021, #3 in FY2022, #8 in FY2023 and #11 in FY2024; up 5 since FY2024.
7	Amentum Holdings, Inc. 3 awardees, including Amentum Technology, Inc., Amentum Environment & Energy, Inc. and Amentum Services, Inc. Top agencies Army (Department of the Army) DOT (Department of Transportation) Navy (Department of the Navy)	$93,502,800	3.8%	Rank history: not on the FY2021–FY2024 lists; new.
8	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$82,338,964	3.4%	Rank history: #7 in FY2021, #2 in FY2022, #5 in FY2023 and #4 in FY2024; down 4 since FY2024.
9	Hydrogeologic, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$81,364,936	3.3%	Rank history: #2 in FY2021, #4 in FY2022, #4 in FY2023 and #5 in FY2024; down 4 since FY2024.
10	AECOM 2 awardees, including AECOM Technical Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$51,735,670	2.1%	Rank history: #33 in FY2021, #5 in FY2022, #3 in FY2023 and #46 in FY2024; up 36 since FY2024.
11	Oneida Environmental, LLC Top agencies Army (Department of the Army)	$41,714,271	1.7%	Rank history: not on the FY2021–FY2024 lists; up 107 since FY2024.
12	Inmar, Inc. Through Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$41,222,752	1.7%	Rank history: not on the FY2021–FY2024 lists; new.
13	Tetra Tech, Inc. 6 awardees, including Tetra TECH EC, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$35,137,811	1.4%	Rank history: #13 in FY2021, #14 in FY2022, #24 in FY2023 and #12 in FY2024; down 1 since FY2024.
14	Bristol Bay Native Corporation 3 awardees, including Bristol Environmental Solutions LLC and Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$33,645,199	1.4%	Rank history: not on the FY2021–FY2022 lists, #36 in FY2023 and #76 in FY2024; up 62 since FY2024.
15	Hgl-Aptim Technologies JV LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$31,885,037	1.3%	Rank history: not on the FY2021–FY2024 lists; new.
16	Kemron Environmental Services Inc. 2 awardees, including Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$28,940,004	1.2%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2024; down 10 since FY2024.
17	Environmental Chemical Corporation 3 awardees, including Enviro-Fix Solutions LLC and ECC Environmental LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$28,348,147	1.2%	Rank history: #86 in FY2021, not on the FY2022 list, #45 in FY2023 and #23 in FY2024; up 6 since FY2024.
18	CDM Smith Inc. Through CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$26,985,173	1.1%	Rank history: #12 in FY2021, #16 in FY2022 and not on the FY2023–FY2024 lists; returned.
19	Ahtna Global LLC 2 awardees Top agencies Army (Department of the Army)	$26,229,513	1.1%	Rank history: not on the FY2021–FY2023 lists and #55 in FY2024; up 36 since FY2024.
20	Conti Federal Services, LLC Top agencies EPA (Environmental Protection Agency)	$23,113,117	0.9%	Rank history: not on the FY2021–FY2023 lists and #24 in FY2024; up 4 since FY2024.
21	Calista Corp 5 awardees, including Brice Engineering, LLC, Brice Solutions, LLC and Brice Environmental Services Corporation Top agencies Army (Department of the Army) DOT (Department of Transportation) USAF (Department of the Air Force)	$22,678,340	0.9%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2024; up 57 since FY2024.
22	The Aleut Corporation Through Aleut Environmental Remediation, LLC Top agencies Army (Department of the Army)	$22,585,999	0.9%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and not on the FY2024 list; returned.
23	Hgl-Aptim JV LLC Top agencies Army (Department of the Army)	$22,345,992	0.9%	Rank history: not on the FY2021 list, #18 in FY2022, #37 in FY2023 and #16 in FY2024; down 7 since FY2024.
24	Bering Straits Native Corporation 5 awardees, including Paragon Professional Services LLC, Paragon Environmental Services, LLC and Environmental Management, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOT (Department of Transportation)	$22,279,335	0.9%	Rank history: not on the FY2021–FY2024 lists; new.
25	Gsia-Parsons JV LLC Top agencies Army (Department of the Army)	$22,190,054	0.9%	Rank history: not on the FY2021–FY2024 lists; new.
26	Ahtna-Brennan JV, LLC Top agencies EPA (Environmental Protection Agency)	$21,315,304	0.9%	Rank history: not on the FY2021–FY2024 lists; new.
27	Jacobs Engineering Group Inc. 4 awardees, including Jacobs Usae Joint Venture, Ch2M Hill Constructors, Inc. and Jacobs Government Services Company Top agencies EPA (Environmental Protection Agency) DECA (Defense Commissary Agency) Army (Department of the Army)	$17,637,970	0.7%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and #44 in FY2024; up 17 since FY2024.
28	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$17,181,032	0.7%	Rank history: not on the FY2021–FY2022 lists, #21 in FY2023 and #66 in FY2024; up 38 since FY2024.
29	Guidehouse Inc. 2 awardees, including Aptim Federal Services, LLC and Aptim Hdr, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) EPA (Environmental Protection Agency)	$17,046,894	0.7%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2024; up 10 since FY2024.
30	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$15,976,960	0.7%	Rank history: #20 in FY2021, #30 in FY2022, #34 in FY2023 and #61 in FY2024; up 31 since FY2024.
31	Promethean Operating I LLC Top agencies DOI (Department of the Interior)	$14,866,119	0.6%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2024; up 2 since FY2024.
32	Eastern Shawnee - Bay West JV, LLC Top agencies Army (Department of the Army)	$14,384,119	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
33	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$11,267,164	0.5%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2023 and #43 in FY2024; up 10 since FY2024.
34	Energysolutions, LLC 3 awardees, including Energysolutions Services, Inc. Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$11,090,665	0.5%	Rank history: not on the FY2021–FY2024 lists; up 289 since FY2024.
35	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$11,060,757	0.5%	Rank history: #69 in FY2021, #19 in FY2022, #90 in FY2023 and #31 in FY2024; down 4 since FY2024.
36	Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$10,927,005	0.4%	Rank history: not on the FY2021–FY2023 lists and #94 in FY2024; up 58 since FY2024.
37	Weston Solutions Holdings Inc 2 awardees, including Weston Solutions Inc. Top agencies EPA (Environmental Protection Agency)	$10,742,735	0.4%	Rank history: #58 in FY2021, #31 in FY2022, #43 in FY2023 and #21 in FY2024; down 16 since FY2024.
38	Clean Harbors Inc. Through Clean Harbors Environmental Services Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$10,633,113	0.4%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2024; up 37 since FY2024.
39	Amentum Technology, Inc. Top agencies Army (Department of the Army)	$10,503,670	0.4%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2024; down 29 since FY2024.
40	Tehama Technical Services, LLC Top agencies Army (Department of the Army)	$10,065,342	0.4%	Rank history: not on the FY2021–FY2024 lists; up 159 since FY2024.
41	Navarro Research and Engineering, Inc. Top agencies Army (Department of the Army)	$9,411,259	0.4%	Rank history: #31 in FY2021, #29 in FY2022, #46 in FY2023 and #34 in FY2024; down 7 since FY2024.
42	Ahtna Solutions, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) DOT (Department of Transportation)	$9,310,394	0.4%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023 and #56 in FY2024; up 14 since FY2024.
43	Cape-Weston JV3 LLC Top agencies Navy (Department of the Navy)	$8,356,896	0.3%	Rank history: not on the FY2021–FY2024 lists; up 128 since FY2024.
44	Aergc JV LLC Top agencies Army (Department of the Army)	$8,326,564	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
45	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$7,707,747	0.3%	Rank history: #36 in FY2021, #33 in FY2022, not on the FY2023 list and #48 in FY2024; up 3 since FY2024.
46	Cape Environmental Management Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$7,462,963	0.3%	Rank history: #50 in FY2021, #23 in FY2022 and not on the FY2023–FY2024 lists; up 84 since FY2024.
47	Fpm-Aecom JV1 2 awardees, including Fpm-Aecom JV2 Top agencies Army (Department of the Army)	$7,008,253	0.3%	Rank history: not on the FY2021 list, #28 in FY2022, #22 in FY2023 and #37 in FY2024; down 10 since FY2024.
48	Triumvirate Environmental, LLC 2 awardees, including West Central Environmental Corp. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Army (Department of the Army)	$6,912,710	0.3%	Rank history: #48 in FY2021, #55 in FY2022, #50 in FY2023 and #53 in FY2024; up 5 since FY2024.
49	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$6,209,587	0.3%	Rank history: #23 in FY2021, #11 in FY2022, #12 in FY2023 and #18 in FY2024; down 31 since FY2024.
50	Fidelis-Bbd, LLC Top agencies EPA (Environmental Protection Agency)	$6,030,015	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
51	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army)	$6,002,720	0.2%	Rank history: not on the FY2021–FY2022 lists, #72 in FY2023 and #36 in FY2024; down 15 since FY2024.
52	3D Envirologics LLC Top agencies HHS (Department of Health and Human Services)	$5,845,879	0.2%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2024; up 34 since FY2024.
53	Environmental Science Corporation Top agencies Navy (Department of the Navy)	$5,557,889	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
54	LPS Kemron JV LLC Top agencies EPA (Environmental Protection Agency)	$5,370,014	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
55	Inspection Experts Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) Navy (Department of the Navy)	$5,252,185	0.2%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and #99 in FY2024; up 44 since FY2024.
56	Oneida-Stantec JV LLC Top agencies Army (Department of the Army)	$5,168,223	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
57	J.f. Brennan Company, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$4,748,916	0.2%	Rank history: not on the FY2021–FY2023 lists and #19 in FY2024; down 38 since FY2024.
58	Bayside-Errg JV Top agencies DOI (Department of the Interior)	$4,549,842	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
59	Broadbent & Associates, Inc. Top agencies DOI (Department of the Interior)	$4,467,532	0.2%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2024; up 10 since FY2024.
60	C & C Environmental Inc. Top agencies Army (Department of the Army)	$4,442,134	0.2%	Rank history: #56 in FY2021, #61 in FY2022, #74 in FY2023 and #87 in FY2024; up 27 since FY2024.
61	State of California Department of Toxic Substances Control Top agencies NASA (National Aeronautics and Space Administration)	$4,409,669	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
62	GSI North America Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,389,831	0.2%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2024; down 10 since FY2024.
63	Weston-Techlaw JV LLC Top agencies EPA (Environmental Protection Agency)	$4,284,865	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
64	Bering Sea Eccotech LLC Top agencies Navy (Department of the Navy)	$4,230,600	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2024; up 7 since FY2024.
65	Pika International Inc. 2 awardees, including Pika-Pirnie JV LLC Top agencies Army (Department of the Army)	$4,197,930	0.2%	Rank history: not on the FY2021–FY2023 lists and #68 in FY2024; up 3 since FY2024.
66	Nakupuna Consulting LLC Top agencies Army (Department of the Army)	$3,887,221	0.2%	Rank history: not on the FY2021–FY2024 lists; up 46 since FY2024.
67	PB Environmental General Partnership Top agencies Army (Department of the Army)	$3,488,796	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
68	AGN JV LLC Top agencies Army (Department of the Army)	$3,418,886	0.1%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2023 and not on the FY2024 list; up 144 since FY2024.
69	Engineering/Remediation Resources Group Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior) Army (Department of the Army)	$3,239,575	0.1%	Rank history: #73 in FY2021, #35 in FY2022, #97 in FY2023 and #42 in FY2024; down 27 since FY2024.
70	Sandow Construction Inc. Top agencies VA (Department of Veterans Affairs) EAC (US Election Assistance Commission)	$3,232,952	0.1%	Rank history: not on the FY2021–FY2024 lists; up 70 since FY2024.
71	Cherokee Nation Through Cherokee Federal Solutions, L.L.C. Top agencies Army (Department of the Army)	$3,154,242	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
72	Environmental Compliance Consultants, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOI (Department of the Interior)	$3,044,947	0.1%	Rank history: #43 in FY2021, #42 in FY2022, #48 in FY2023 and #54 in FY2024; down 18 since FY2024.
73	Paragon-Jacobs Joint Venture, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$2,971,812	0.1%	Rank history: #44 in FY2021, #34 in FY2022, #84 in FY2023 and not on the FY2024 list; up 83 since FY2024.
74	Red Rock Remediation JV1 Top agencies EPA (Environmental Protection Agency)	$2,845,749	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
75	Real Model Solutions, Inc. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$2,822,257	0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2024; up 5 since FY2024.
76	Composting Sme, LLC Top agencies USDA (Department of Agriculture)	$2,800,035	0.1%	Rank history: not on the FY2021 list, #69 in FY2022 and not on the FY2023–FY2024 lists; up 68 since FY2024.
77	Del Mar-Trevet-Jv LLC Top agencies Navy (Department of the Navy)	$2,790,859	0.1%	Rank history: not on the FY2021–FY2024 lists; up 45 since FY2024.
78	Republic Services Inc. 9 awardees, including US Ecology Alaska LLC, US Ecology Washington Inc. and Advanced Chemical Transport LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOI (Department of the Interior)	$2,764,858	0.1%	Rank history: not on the FY2021–FY2024 lists; up 28 since FY2024.
79	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) USDA (Department of Agriculture)	$2,754,478	0.1%	Rank history: #60 in FY2021 and not on the FY2022–FY2024 lists; up 26 since FY2024.
80	Dawson Solutions LLC Through Laukoa Environmental Solutions, Inc. Top agencies Army (Department of the Army)	$2,707,166	0.1%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2024; down 55 since FY2024.
81	CTI and Associates Inc. 2 awardees, including CTL Environmental LLC Top agencies Army (Department of the Army) DOE (Department of Energy)	$2,604,827	0.1%	Rank history: not on the FY2021–FY2024 lists; up 91 since FY2024.
82	Tanaq-Sundance 8(A) Joint Venture, LLC Top agencies Army (Department of the Army)	$2,601,662	0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023 and #58 in FY2024; down 24 since FY2024.
83	KGS Seres 8A JV LLC Top agencies Army (Department of the Army)	$2,578,218	0.1%	Rank history: #47 in FY2021, #47 in FY2022, #62 in FY2023 and #67 in FY2024; down 16 since FY2024.
84	Leidos Holdings, Inc. Through Leidos, Inc. Top agencies Army (Department of the Army)	$2,538,345	0.1%	Rank history: #29 in FY2021, #45 in FY2022, #29 in FY2023 and #51 in FY2024; down 33 since FY2024.
85	Oneida Total Integrated Enterprises LLC Top agencies DLA (Defense Logistics Agency)	$2,447,565	0.1%	Rank history: not on the FY2021 list, #80 in FY2022, not on the FY2023 list and #96 in FY2024; up 11 since FY2024.
86	Basha Services, LLC Top agencies EPA (Environmental Protection Agency)	$2,402,559	0.1%	Rank history: not on the FY2021 list, #90 in FY2022 and not on the FY2023–FY2024 lists; up 66 since FY2024.
87	Mellor Engineering Inc Top agencies Army (Department of the Army)	$2,208,231	0.1%	Rank history: not on the FY2021–FY2024 lists; up 21 since FY2024.
88	Bay West LLC Top agencies Army (Department of the Army) DOJ (Department of Justice)	$2,170,098	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
89	Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$2,154,720	0.1%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2024; down 44 since FY2024.
90	Nobis Engineering, Inc. Top agencies EPA (Environmental Protection Agency)	$2,117,617	0.1%	Rank history: #38 in FY2021, #24 in FY2022, #87 in FY2023 and #30 in FY2024; down 60 since FY2024.
91	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs)	$2,104,582	0.1%	Rank history: not on the FY2021 list, #84 in FY2022 and not on the FY2023–FY2024 lists; up 10 since FY2024.
92	Hdr, Inc. 3 awardees, including HDR Aptim LLC and HDR Environmental, Operations and Construction, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$1,994,609	0.1%	Rank history: #32 in FY2021, #22 in FY2022, #27 in FY2023 and #63 in FY2024; down 29 since FY2024.
93	Insight-Esi LLC Top agencies Navy (Department of the Navy)	$1,989,393	0.1%	Rank history: #61 in FY2021 and not on the FY2022–FY2024 lists; returned.
94	Hltli Joint Venture L.L.C. Top agencies Army (Department of the Army)	$1,934,666	0.1%	Rank history: not on the FY2021–FY2024 lists; up 22 since FY2024.
95	Enviro-Terra Inc. Top agencies Army (Department of the Army)	$1,826,509	0.1%	Rank history: not on the FY2021–FY2024 lists; up 174 since FY2024.
96	Osage Nation Energy Services LLC 2 awardees Top agencies Army (Department of the Army)	$1,808,346	0.1%	Rank history: not on the FY2021–FY2024 lists; up 62 since FY2024.
97	Haztrain Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$1,758,486	0.1%	Rank history: not on the FY2021–FY2024 lists; up 67 since FY2024.
98	Aes-Esfs JV I LLC Top agencies Navy (Department of the Navy)	$1,745,796	0.1%	Rank history: not on the FY2021–FY2024 lists; up 111 since FY2024.
99	Ahtna-Arcadis 8(A) JV #2, LLC Top agencies Army (Department of the Army)	$1,743,347	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
100	Neie Medical Waste Services, LLC Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security)	$1,732,946	0.1%	Rank history: not on the FY2021–FY2024 lists; up 255 since FY2024.

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 $2.44 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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