Top 100 Contractors in NAICS 21: Mining, Quarrying, and Oil and Gas Extraction, FY2023

Name: Top 100 Contractors in NAICS 21: Mining, Quarrying, and Oil and Gas Extraction, FY2023
Creator: GovTribe

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

The top 10 won 56% of FY2023 NAICS 21 contract dollars

Contract obligations: $178,580,185 Net of deobligations, by contracts coded NAICS 21 or a code under it
Contractors: 424 Parent companies with an obligation
Largest contractor: Usibelli Coal Mine, Inc. $39 million, 17.1% 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	Usibelli Coal Mine, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$39,010,228	17.1%	Rank history: #3 in FY2021, #1 in FY2022, #1 in FY2024 and #1 in FY2025; unchanged since FY2022.
2	Tiger Natural Gas, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$23,437,505	10.3%	Rank history: #7 in FY2021, #5 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
3	WGL Energy Services Inc. Top agencies HHS (Department of Health and Human Services)	$17,576,673	7.7%	Rank history: #25 in FY2021, not on the FY2022 list, #11 in FY2024 and #5 in FY2025; up 185 since FY2022.
4	Asrc Consulting & Environmental Services LLC Top agencies DOI (Department of the Interior) DOE (Department of Energy)	$16,045,888	7.1%	Rank history: not on the FY2021–FY2022 lists, #3 in FY2024 and not on the FY2025 list; new.
5	Tarpan Construction, LLC Top agencies Army (Department of the Army)	$6,232,536	2.7%	Rank history: #52 in FY2021, #9 in FY2022, #13 in FY2024 and #32 in FY2025; up 4 since FY2022.
6	Centrica PLC Through NRG Business Marketing LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) NASA (National Aeronautics and Space Administration)	$5,969,449	2.6%	Rank history: #17 in FY2021, #48 in FY2022, #22 in FY2024 and not on the FY2025 list; up 42 since FY2022.
7	Energy EPC Solutions, LLC Top agencies DOI (Department of the Interior)	$5,572,493	2.4%	Rank history: not on the FY2021–FY2022 lists, #56 in FY2024 and not on the FY2025 list; new.
8	Crowley Holdings LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) USAF (Department of the Air Force)	$5,240,073	2.3%	Rank history: #8 in FY2021, #7 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
9	PCI Support Services LLC Top agencies Navy (Department of the Navy)	$5,161,838	2.3%	Rank history: not on the FY2021–FY2022 lists, #6 in FY2024 and #18 in FY2025; new.
10	NRG Business Marketing LLC Top agencies VA (Department of Veterans Affairs)	$4,194,881	1.8%	Rank history: not on the FY2021 list, #47 in FY2022, #17 in FY2024 and #15 in FY2025; up 37 since FY2022.
11	Centerpoint Energy Services Inc. Through Nextera Energy Services Gas, LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$3,547,714	1.6%	Rank history: #12 in FY2021, #10 in FY2022, #18 in FY2024 and not on the FY2025 list; down 1 since FY2022.
12	Specialized Government Sourcing, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) VA (Department of Veterans Affairs)	$2,831,491	1.2%	Rank history: #72 in FY2021, not on the FY2022 list, #12 in FY2024 and #20 in FY2025; returned.
13	Exelon Corporation Through Constellation Newenergy - Gas Division, LLC Top agencies Army (Department of the Army)	$2,652,005	1.2%	Rank history: #6 in FY2021, #20 in FY2022 and not on the FY2024–FY2025 lists; up 7 since FY2022.
14	Texas Ohio Energy Inc. Through High Desert Pipeline, Inc. Top agencies Army (Department of the Army)	$2,500,000	1.1%	Rank history: not on the FY2021 list, #36 in FY2022, #15 in FY2024 and not on the FY2025 list; up 22 since FY2022.
15	Duwamish Services LLC Top agencies DOI (Department of the Interior)	$2,350,750	1.0%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
16	Jordan Modern Oil & Fuel Services Ltd. Co. Top agencies DOS (Department of State)	$2,183,869	1.0%	Rank history: not on the FY2021 list, #22 in FY2022, #20 in FY2024 and #19 in FY2025; up 6 since FY2022.
17	American Classic Construction Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) USDA (Department of Agriculture)	$2,175,727	1.0%	Rank history: #13 in FY2021, #18 in FY2022, #8 in FY2024 and #10 in FY2025; up 1 since FY2022.
18	Choctaw Transportation Company, Inc. Top agencies DOI (Department of the Interior)	$2,000,000	0.9%	Rank history: #77 in FY2021, not on the FY2022 list, #78 in FY2024 and not on the FY2025 list; up 110 since FY2022.
19	Skagit Aggregates LLC Top agencies Army (Department of the Army)	$1,852,109	0.8%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
20	Advanced American Construction, Inc. Top agencies DOI (Department of the Interior)	$1,767,650	0.8%	Rank history: not on the FY2021 list, #27 in FY2022 and not on the FY2024–FY2025 lists; up 7 since FY2022.
21	Constellation Newenergy Inc Through Constellation Newenergy - Gas Division, LLC Top agencies Army (Department of the Army)	$1,482,091	0.7%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
22	Blade Energy Partners, Ltd. Top agencies DOI (Department of the Interior)	$1,451,012	0.6%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2024 and not on the FY2025 list; new.
23	Aviation Devices and Electronic Components L.L.C. 2 awardees Top agencies DLA (Defense Logistics Agency)	$1,423,557	0.6%	Rank history: #15 in FY2021, #14 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
24	Dakota Constructors, Inc. Top agencies Army (Department of the Army)	$1,297,000	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
25	Ciri Development Corporation Through North Wind Site Services, LLC Top agencies DOI (Department of the Interior)	$1,272,112	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
26	Medved Global Inc Top agencies USDA (Department of Agriculture)	$1,218,789	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
27	Areaka Trading & Logistics Company Top agencies Army (Department of the Army)	$1,164,422	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
28	Enspire Energy, LLC Top agencies DOJ (Department of Justice)	$1,071,777	0.5%	Rank history: #22 in FY2021, #30 in FY2022, #40 in FY2024 and #43 in FY2025; up 2 since FY2022.
29	Pala Wood Services Company, Inc. Top agencies Army (Department of the Army)	$1,011,259	0.4%	Rank history: #35 in FY2021, #32 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
30	Skyline Materials, Ltd. Top agencies Army (Department of the Army)	$1,010,844	0.4%	Rank history: #42 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 205 since FY2022.
31	Olgoonik Oilfield Services LLC Top agencies DOI (Department of the Interior)	$933,080	0.4%	Rank history: not on the FY2021 list, #4 in FY2022, #2 in FY2024 and #35 in FY2025; down 27 since FY2022.
32	Red Dirt Energy LLC Top agencies DOI (Department of the Interior)	$905,513	0.4%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2024 and not on the FY2025 list; new.
33	P G & E LLC Top agencies DOI (Department of the Interior)	$883,149	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
34	Appollo Energy LLC Top agencies USDA (Department of Agriculture)	$835,386	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
35	Hurst-Rosche, Inc. Top agencies Army (Department of the Army)	$800,665	0.4%	Rank history: not on the FY2021 list, #69 in FY2022, #71 in FY2024 and #94 in FY2025; up 34 since FY2022.
36	Next Generation Logistics, LLC Top agencies Army (Department of the Army)	$800,000	0.4%	Rank history: #51 in FY2021, not on the FY2022 list, #38 in FY2024 and #24 in FY2025; returned.
37	Cobb Electric Membership Corporation Through Gas South, LLC Top agencies NASA (National Aeronautics and Space Administration) DOJ (Department of Justice)	$780,488	0.3%	Rank history: #86 in FY2021, #26 in FY2022, not on the FY2024 list and #50 in FY2025; down 11 since FY2022.
38	New Enterprise Stone & Lime Co Inc. Top agencies Army (Department of the Army) DOJ (Department of Justice)	$754,148	0.3%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2024 and #77 in FY2025; up 95 since FY2022.
39	Structural Hardware and Supply, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$721,456	0.3%	Rank history: #58 in FY2021, not on the FY2022 list, #58 in FY2024 and #85 in FY2025; up 86 since FY2022.
40	Bayer Construction Company, Inc. Top agencies Army (Department of the Army)	$633,848	0.3%	Rank history: #64 in FY2021, #50 in FY2022, #37 in FY2024 and #34 in FY2025; up 10 since FY2022.
41	Fireside Natural Gas LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security)	$618,425	0.3%	Rank history: #66 in FY2021, #37 in FY2022, #44 in FY2024 and not on the FY2025 list; down 4 since FY2022.
42	Grarok LLC Top agencies Army (Department of the Army)	$597,472	0.3%	Rank history: #48 in FY2021, #51 in FY2022, #32 in FY2024 and #40 in FY2025; up 9 since FY2022.
43	Ecology Mir Group LLC Top agencies DOI (Department of the Interior) Army (Department of the Army)	$597,212	0.3%	Rank history: #30 in FY2021, #84 in FY2022, not on the FY2024 list and #51 in FY2025; up 41 since FY2022.
44	Silver Valley Propane Inc. Top agencies Navy (Department of the Navy)	$582,222	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
45	Iron Mountain Quarry LLC Top agencies Army (Department of the Army)	$578,500	0.3%	Rank history: not on the FY2021 list, #66 in FY2022, #60 in FY2024 and not on the FY2025 list; up 21 since FY2022.
46	Willard Quarries, Inc. Top agencies Army (Department of the Army)	$487,995	0.2%	Rank history: #87 in FY2021, #74 in FY2022, #27 in FY2024 and #29 in FY2025; up 28 since FY2022.
47	Lineport Excavating, LLC Top agencies Army (Department of the Army)	$485,399	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #45 in FY2025; up 66 since FY2022.
48	Ames 1, LLC Top agencies USAF (Department of the Air Force)	$482,418	0.2%	Rank history: #65 in FY2021, #63 in FY2022, #52 in FY2024 and not on the FY2025 list; up 15 since FY2022.
49	Gulf Pioneer Company L.L.C. Top agencies Army (Department of the Army)	$478,192	0.2%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2024 and not on the FY2025 list; new.
50	DH Ortega Construction LLC Top agencies Army (Department of the Army)	$466,596	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
51	Green Dream International LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture) Army (Department of the Army)	$463,179	0.2%	Rank history: #11 in FY2021, #38 in FY2022, not on the FY2024 list and #33 in FY2025; down 13 since FY2022.
52	Moss Kevin Top agencies Army (Department of the Army)	$450,660	0.2%	Rank history: #56 in FY2021, #55 in FY2022, not on the FY2024 list and #47 in FY2025; up 3 since FY2022.
53	Capital Sand Co Inc. Top agencies Army (Department of the Army)	$448,500	0.2%	Rank history: #89 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 85 since FY2022.
54	Custom Crushing Industries, Inc. Top agencies USDA (Department of Agriculture)	$442,712	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
55	RBO Technology, LLC Top agencies Army (Department of the Army)	$439,337	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
56	Golat & Engel Custom Gravel Crushing Inc. Top agencies USDA (Department of Agriculture)	$430,135	0.2%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2024 and #79 in FY2025; up 48 since FY2022.
57	Griffin's Propane, Inc. Top agencies HHS (Department of Health and Human Services)	$410,000	0.2%	Rank history: not on the FY2021 list, #56 in FY2022, #54 in FY2024 and not on the FY2025 list; down 1 since FY2022.
58	Sean W Smith Inc. Top agencies Army (Department of the Army)	$401,350	0.2%	Rank history: #32 in FY2021, #60 in FY2022, #55 in FY2024 and not on the FY2025 list; up 2 since FY2022.
59	Preferred Materials Inc. Top agencies NASA (National Aeronautics and Space Administration)	$397,200	0.2%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2024 and not on the FY2025 list; new.
60	Schuck Development Corp Top agencies USDA (Department of Agriculture)	$389,275	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
61	Tauber Oil Company Through Interconn Resources LLC Top agencies NASA (National Aeronautics and Space Administration)	$387,338	0.2%	Rank history: #92 in FY2021, not on the FY2022 list, #47 in FY2024 and not on the FY2025 list; up 265 since FY2022.
62	Advanced CNC Manufacturing, Inc. Top agencies DLA (Defense Logistics Agency)	$383,928	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #92 in FY2025; new.
63	Suburban Propane Partners, L.P Top agencies DOI (Department of the Interior)	$362,010	0.2%	Rank history: #60 in FY2021, #34 in FY2022, not on the FY2024 list and #59 in FY2025; down 29 since FY2022.
64	A Williams & Sons LLC Top agencies USDA (Department of Agriculture)	$342,600	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
65	Darya Company Top agencies Army (Department of the Army)	$341,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
66	Omang Technologies & Trading L.l.c Top agencies USAF (Department of the Air Force)	$334,500	0.1%	Rank history: not on the FY2021 list, #31 in FY2022 and not on the FY2024–FY2025 lists; down 35 since FY2022.
67	Sebang Oil Corporation Top agencies Army (Department of the Army)	$329,883	0.1%	Rank history: not on the FY2021 list, #58 in FY2022, #68 in FY2024 and #71 in FY2025; down 9 since FY2022.
68	TGS Geophysical Company (UK) Limited Through A2D Technologies, Inc. Top agencies DOI (Department of the Interior)	$327,330	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
69	Hueckman Contracting LLC Top agencies USDA (Department of Agriculture)	$324,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
70	T.p. Construction, Inc. Top agencies DOI (Department of the Interior)	$323,300	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
71	Cook Inlet Region Inc. Through North Wind Site Services LLC Top agencies DOI (Department of the Interior)	$289,999	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
72	Clark Construction Co Inc Allen Top agencies DOI (Department of the Interior)	$280,000	0.1%	Rank history: #94 in FY2021, #72 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
73	Gebhardt Post Plant & Sawmill Top agencies USAF (Department of the Air Force)	$277,200	0.1%	Rank history: not on the FY2021 list, #97 in FY2022, #85 in FY2024 and #90 in FY2025; up 24 since FY2022.
74	Rocky Mountain Aggregate & Construction, LLC Top agencies USDA (Department of Agriculture)	$276,100	0.1%	Rank history: #75 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
75	Artik Ads, LLC Top agencies USDA (Department of Agriculture)	$273,013	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
76	Irvco Asphalt & Gravel, Inc. Top agencies USDA (Department of Agriculture)	$265,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
77	3B Enterprises, LLC Top agencies USDA (Department of Agriculture)	$259,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
78	Pineridge Farms Inc. Top agencies DOI (Department of the Interior)	$250,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 117 since FY2022.
79	Mansfield Energy Corp. Through Mansfield Power & Gas LLC Top agencies USAF (Department of the Air Force)	$250,000	0.1%	Rank history: not on the FY2021–FY2022 lists, #26 in FY2024 and not on the FY2025 list; new.
80	Coastal Drilling East LLC Top agencies HHS (Department of Health and Human Services)	$249,749	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
81	Acty Co., Ltd. Top agencies Navy (Department of the Navy)	$243,802	0.1%	Rank history: #79 in FY2021, #78 in FY2022, #90 in FY2024 and #87 in FY2025; down 3 since FY2022.
82	GPM Inc Top agencies Army (Department of the Army)	$238,723	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Pitlik & Wick, Inc. Top agencies USDA (Department of Agriculture)	$230,014	0.1%	Rank history: #82 in FY2021, #61 in FY2022, #88 in FY2024 and not on the FY2025 list; down 22 since FY2022.
84	Seaton Earthmover Inc. Top agencies Army (Department of the Army)	$228,015	0.1%	Rank history: #63 in FY2021, #85 in FY2022, #86 in FY2024 and not on the FY2025 list; up 1 since FY2022.
85	Gerou Excavating Inc. Top agencies USDA (Department of Agriculture)	$217,970	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
86	BCE Solutions LLC Top agencies HHS (Department of Health and Human Services)	$217,506	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
87	BP P.L.C. Through BP Energy Company Top agencies NASA (National Aeronautics and Space Administration)	$216,392	0.1%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2024 and #60 in FY2025; new.
88	Cowden Inc. Top agencies Army (Department of the Army)	$215,029	0.1%	Rank history: #76 in FY2021, #46 in FY2022 and not on the FY2024–FY2025 lists; down 42 since FY2022.
89	National Railway Equipment Co. Top agencies Navy (Department of the Navy)	$211,793	0.1%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2024 and not on the FY2025 list; new.
90	Kesler Construction Inc. Top agencies USDA (Department of Agriculture)	$210,676	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
91	Robert S Murray Top agencies DOI (Department of the Interior)	$207,095	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
92	FD Inc. Top agencies USAF (Department of the Air Force)	$206,106	0.1%	Rank history: #93 in FY2021, #81 in FY2022 and not on the FY2024–FY2025 lists; down 11 since FY2022.
93	Al Zoba General Trading & Contracting Co. WLL Top agencies Army (Department of the Army)	$205,638	0.1%	Rank history: not on the FY2021 list, #57 in FY2022, #49 in FY2024 and not on the FY2025 list; down 36 since FY2022.
94	Supplied Industrial Solutions, Inc. Top agencies Army (Department of the Army)	$198,250	0.1%	Rank history: not on the FY2021 list, #19 in FY2022 and not on the FY2024–FY2025 lists; down 75 since FY2022.
95	Golden Lines Contracting Company Top agencies USAF (Department of the Air Force)	$196,305	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
96	UGI Corporation Through UGI Energy Services, LLC Top agencies DOJ (Department of Justice)	$194,451	0.1%	Rank history: #23 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
97	Amrize ACM PNW Inc. Top agencies Army (Department of the Army)	$189,133	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
98	R & R Global 1969 LLC Top agencies Army (Department of the Army)	$181,780	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
99	Helena Sand & Gravel, Inc. Top agencies Army (Department of the Army)	$172,135	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
100	Advanced Future Group International Gen. Trading & Cont. Co. WLL Top agencies Army (Department of the Army)	$165,904	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2024 and not on the FY2025 list; new.

Show 75 more

100 of 424 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 21

Code	Net obligations	Largest contractor
212 Mining (except Oil and Gas)	$97,848,454	Usibelli Coal Mine, Inc.
211 Oil and Gas Extraction	$72,245,346	Tiger Natural Gas, Inc.
213 Support Activities for Mining	$8,486,385	Asrc Consulting & Environmental Services LLC

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 $228 million obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2023 ran Oct 1, 2022 – Sep 30, 2023. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2022. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2022 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 21 contractors in FY2023?

1. Usibelli Coal Mine, Inc. ($39M), 2. Tiger Natural Gas, Inc. ($23.4M), 3. WGL Energy Services Inc. ($17.6M), 4. Asrc Consulting & Environmental Services LLC ($16M), 5. Tarpan Construction, LLC ($6.23M), 6. Centrica PLC ($5.97M), 7. Energy EPC Solutions, LLC ($5.57M), 8. Crowley Holdings LLC ($5.24M), 9. PCI Support Services LLC ($5.16M), 10. NRG Business Marketing LLC ($4.19M).

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