Top 100 Contractors in NAICS 21: Mining, Quarrying, and Oil and Gas Extraction, FY2021

Name: Top 100 Contractors in NAICS 21: Mining, Quarrying, and Oil and Gas Extraction, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 64% of FY2021 NAICS 21 contract dollars

Contract obligations: $247,769,048 Net of deobligations, by contracts coded NAICS 21 or a code under it
Contractors: 478 Parent companies with an obligation
Largest contractor: Arctic Slope Regional Corporation $51.6 million, 18.8% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Arctic Slope Regional Corporation 2 awardees, including Asrc Consulting & Environmental Services, LLC and Asrc Federal Facilities Logistics, LLC Top agencies DOE (Department of Energy) DOI (Department of the Interior) DLA (Defense Logistics Agency)	$51,627,926	18.8%	Rank history: #8 in FY2022, not on the FY2023–FY2024 lists and #3 in FY2025; new, not ranked in FY2020.
2	Tetra Tech-Maytag Aircraft Corporation Joint Venture Top agencies DLA (Defense Logistics Agency)	$38,742,582	14.1%	Rank history: #2 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
3	Usibelli Coal Mine, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$30,924,087	11.3%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; down 1 since FY2020.
4	Weston Solutions Holdings, Inc. Through Weston Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$25,127,970	9.1%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
5	Pond Constructors Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$6,234,588	2.3%	Rank history: #3 in FY2022, not on the FY2023 list, #45 in FY2024 and not on the FY2025 list; down 1 since FY2020.
6	Exelon Corporation Through Constellation Newenergy - Gas Division, LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$5,966,114	2.2%	Rank history: #20 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
7	Tiger Natural Gas, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) NASA (National Aeronautics and Space Administration)	$5,746,867	2.1%	Rank history: #5 in FY2022, #2 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
8	Crowley Holdings LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) USAF (Department of the Air Force)	$4,930,179	1.8%	Rank history: #7 in FY2022, #8 in FY2023, #7 in FY2024 and #7 in FY2025; down 2 since FY2020.
9	Interagency Readiness Solutions, LLC Top agencies Army (Department of the Army)	$3,243,963	1.2%	Rank history: #15 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
10	Sage Energy Trading LLC Top agencies USAF (Department of the Air Force)	$2,900,475	1.1%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
11	Green Dream International LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$2,814,962	1.0%	Rank history: #38 in FY2022, #51 in FY2023, not on the FY2024 list and #33 in FY2025; up 33 since FY2020.
12	Centerpoint Energy Services Inc. Through Nextera Energy Services Gas, LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) USAF (Department of the Air Force)	$2,555,740	0.9%	Rank history: #10 in FY2022, #11 in FY2023, #18 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
13	American Classic Construction Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) USAF (Department of the Air Force)	$2,530,425	0.9%	Rank history: #18 in FY2022, #17 in FY2023, #8 in FY2024 and #10 in FY2025; up 4 since FY2020.
14	Miller Materials, Inc. Top agencies Army (Department of the Army)	$2,190,720	0.8%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
15	Aviation Devices and Electronic Components, L.L.C. Top agencies DLA (Defense Logistics Agency)	$1,781,430	0.6%	Rank history: #14 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
16	Saudi Naval Support Co. Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army)	$1,761,374	0.6%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; up 24 since FY2020.
17	Centrica PLC Through NRG Business Marketing LLC Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$1,754,397	0.6%	Rank history: #48 in FY2022, #6 in FY2023, #22 in FY2024 and not on the FY2025 list; up 32 since FY2020.
18	O Garcia II LLC Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$1,661,625	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	Gulf Holdings, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) USDA (Department of Agriculture)	$1,653,853	0.6%	Rank history: #29 in FY2022, not on the FY2023 list, #87 in FY2024 and #56 in FY2025; up 17 since FY2020.
20	Supplied Industrial Solutions, Inc. Top agencies Army (Department of the Army)	$1,556,000	0.6%	Rank history: not on the FY2022–FY2025 lists; up 86 since FY2020.
21	Richard J. Mertens, Inc. Top agencies Army (Department of the Army)	$1,474,850	0.5%	Rank history: not on the FY2022–FY2023 lists, #50 in FY2024 and #39 in FY2025; up 80 since FY2020.
22	Enspire Energy, LLC Top agencies DLA (Defense Logistics Agency) DOJ (Department of Justice)	$1,428,539	0.5%	Rank history: #30 in FY2022, #28 in FY2023, #40 in FY2024 and #43 in FY2025; down 2 since FY2020.
23	UGI Corporation 2 awardees, including UGI Energy Services, LLC Top agencies DOJ (Department of Justice) Treasury (Department of the Treasury) Army (Department of the Army)	$1,398,210	0.5%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
24	Goodfellow Bros, LLC Top agencies Army (Department of the Army)	$1,383,550	0.5%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
25	WGL Energy Services Inc. Top agencies DLA (Defense Logistics Agency) JFK (John F. Kennedy Center for the Performing Arts)	$1,372,117	0.5%	Rank history: not on the FY2022 list, #3 in FY2023, #11 in FY2024 and #5 in FY2025; up 26 since FY2020.
26	NRG Energy, Inc. Through NRG Business Marketing LLC Top agencies Army (Department of the Army) DOJ (Department of Justice)	$1,198,179	0.4%	Rank history: #6 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
27	Weston Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$1,165,249	0.4%	Rank history: not on the FY2022–FY2025 lists; down 17 since FY2020.
28	A Plus Well Service Inc. Top agencies DOI (Department of the Interior)	$1,159,090	0.4%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
29	Bristol Infrastructure Design Services LLC Top agencies Army (Department of the Army)	$1,106,156	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	Ecology Mir Group LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$1,038,747	0.4%	Rank history: #84 in FY2022, #43 in FY2023, not on the FY2024 list and #51 in FY2025; up 13 since FY2020.
31	Reasor Building Group LLC Top agencies USAF (Department of the Air Force)	$999,976	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Sean W Smith Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$893,656	0.3%	Rank history: #60 in FY2022, #58 in FY2023, #55 in FY2024 and not on the FY2025 list; down 1 since FY2020.
33	Rogue Industries LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$849,245	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Martin Marietta Materials, Inc. 2 awardees Top agencies Army (Department of the Army) DOI (Department of the Interior)	$797,406	0.3%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
35	Pala Wood Services Company, Inc. Top agencies Army (Department of the Army)	$792,874	0.3%	Rank history: #32 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
36	Rawan Alfarah Company Top agencies Army (Department of the Army)	$790,524	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	L.l. Carter & Son, Inc. Top agencies Army (Department of the Army)	$790,254	0.3%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
38	Enverus, Inc. Top agencies DOE (Department of Energy) DOI (Department of the Interior)	$776,251	0.3%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
39	Architectural Consulting Group of Chicago Inc. Top agencies Army (Department of the Army)	$760,238	0.3%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; down 25 since FY2020.
40	Colonial Group Inc. 2 awardees, including Colonial Energy Inc. and Colonial Fuel and Lubricant Services, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$699,191	0.3%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
41	Penasco Gravel Corp Top agencies USAF (Department of the Air Force) USDA (Department of Agriculture)	$674,370	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Skyline Materials, Ltd. Top agencies Army (Department of the Army)	$629,010	0.2%	Rank history: not on the FY2022 list, #30 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
43	Welter Consulting, Inc. Top agencies DOI (Department of the Interior)	$599,745	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	Continental Industries Field Services, LLC Top agencies DOI (Department of the Interior)	$583,465	0.2%	Rank history: not on the FY2022–FY2025 lists; up 185 since FY2020.
45	Nextera Energy Services Gas, LLC Top agencies USAF (Department of the Air Force)	$565,000	0.2%	Rank history: not on the FY2022–FY2023 lists, #34 in FY2024 and #8 in FY2025; down 26 since FY2020.
46	International Trade Management Group, LLC Top agencies DOI (Department of the Interior)	$562,060	0.2%	Rank history: #11 in FY2022, not on the FY2023 list, #9 in FY2024 and not on the FY2025 list; down 21 since FY2020.
47	Luhr Bros., Inc. Top agencies Army (Department of the Army)	$544,173	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	Grarok LLC Top agencies Army (Department of the Army)	$514,750	0.2%	Rank history: #51 in FY2022, #42 in FY2023, #32 in FY2024 and #40 in FY2025; up 114 since FY2020.
49	Iron Horse Excavating, Inc. Top agencies DOI (Department of the Interior)	$504,762	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Louis Berger U.S. Inc. Through VGS Infrastructure Services Inc. Top agencies DLA (Defense Logistics Agency)	$475,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Next Generation Logistics, LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$462,407	0.2%	Rank history: not on the FY2022 list, #36 in FY2023, #38 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
52	Tarpan Construction, LLC Top agencies Army (Department of the Army)	$460,269	0.2%	Rank history: #9 in FY2022, #5 in FY2023, #13 in FY2024 and #32 in FY2025; down 28 since FY2020.
53	Palmerton & Parrish, Inc. Top agencies Army (Department of the Army)	$456,354	0.2%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
54	Appalachian Aggregates LLC 4 awardees, including Evans Construction Company and Ash Grove Aggregates, Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture) Army (Department of the Army)	$440,425	0.2%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
55	TGS-Nopec Geophysical Company Through A2D Technologies, Inc. Top agencies DOI (Department of the Interior)	$439,973	0.2%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
56	Moss Kevin Top agencies Army (Department of the Army)	$424,760	0.2%	Rank history: #55 in FY2022, #52 in FY2023, not on the FY2024 list and #47 in FY2025; new, not ranked in FY2020.
57	Big Sky Spreading, LLP Top agencies DOI (Department of the Interior)	$418,160	0.2%	Rank history: #83 in FY2022, not on the FY2023 list, #66 in FY2024 and not on the FY2025 list; up 6 since FY2020.
58	Structural Hardware and Supply, Inc. Top agencies DOI (Department of the Interior)	$417,170	0.2%	Rank history: not on the FY2022 list, #39 in FY2023, #58 in FY2024 and #85 in FY2025; up 94 since FY2020.
59	Yorkshire Industries LLC Top agencies DOI (Department of the Interior) USAF (Department of the Air Force) Army (Department of the Army)	$407,899	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Suburban Propane Partners, L.P Top agencies DOI (Department of the Interior) Navy (Department of the Navy)	$400,762	0.1%	Rank history: #34 in FY2022, #63 in FY2023, not on the FY2024 list and #59 in FY2025; up 26 since FY2020.
61	Pyramid Construction and Aggregates, Inc. Top agencies DOI (Department of the Interior)	$394,188	0.1%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
62	E2 Contracting, Inc. Top agencies DOI (Department of the Interior)	$372,500	0.1%	Rank history: #73 in FY2022, not on the FY2023 list, #35 in FY2024 and #37 in FY2025; new, not ranked in FY2020.
63	Seaton Earthmover Inc. Top agencies Army (Department of the Army)	$360,421	0.1%	Rank history: #85 in FY2022, #84 in FY2023, #86 in FY2024 and not on the FY2025 list; up 21 since FY2020.
64	Bayer Construction Company, Inc. Top agencies Army (Department of the Army)	$347,318	0.1%	Rank history: #50 in FY2022, #40 in FY2023, #37 in FY2024 and #34 in FY2025; down 18 since FY2020.
65	Ames 1, LLC Top agencies USAF (Department of the Air Force)	$339,756	0.1%	Rank history: #63 in FY2022, #48 in FY2023, #52 in FY2024 and not on the FY2025 list; up 7 since FY2020.
66	Fireside Natural Gas LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security)	$318,000	0.1%	Rank history: #37 in FY2022, #41 in FY2023, #44 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
67	CPM Development Corporation Top agencies DOI (Department of the Interior)	$313,475	0.1%	Rank history: not on the FY2022–FY2023 lists, #93 in FY2024 and not on the FY2025 list; up 82 since FY2020.
68	CRT Crushing, Inc. Top agencies USAF (Department of the Air Force)	$310,300	0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
69	DMG Information Inc Through Genscape, Inc. Top agencies DOE (Department of Energy)	$305,407	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Whetrock Inc. Top agencies Army (Department of the Army)	$300,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	County of Montezuma Through Montezuma County Government For Top agencies USDA (Department of Agriculture)	$300,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 29 since FY2020.
72	Specialized Government Sourcing, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) VA (Department of Veterans Affairs)	$299,681	0.1%	Rank history: not on the FY2022 list, #12 in FY2023, #12 in FY2024 and #20 in FY2025; down 37 since FY2020.
73	New Empire Aggregate Top agencies DOI (Department of the Interior)	$298,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
74	P G & E LLC Top agencies DOI (Department of the Interior)	$295,425	0.1%	Rank history: #21 in FY2022 and not on the FY2023–FY2025 lists; down 62 since FY2020.
75	Rocky Mountain Aggregate & Construction, LLC Top agencies USDA (Department of Agriculture)	$293,428	0.1%	Rank history: not on the FY2022 list, #74 in FY2023 and not on the FY2024–FY2025 lists; up 45 since FY2020.
76	Cowden Inc. Top agencies Army (Department of the Army)	$285,800	0.1%	Rank history: #46 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
77	Choctaw Transportation Company, Inc. Top agencies Army (Department of the Army)	$269,562	0.1%	Rank history: not on the FY2022 list, #18 in FY2023, #78 in FY2024 and not on the FY2025 list; down 7 since FY2020.
78	Josef Pravida Top agencies Army (Department of the Army)	$267,710	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
79	Acty Co., Ltd. Top agencies Navy (Department of the Navy)	$261,418	0.1%	Rank history: #78 in FY2022, #81 in FY2023, #90 in FY2024 and #87 in FY2025; new, not ranked in FY2020.
80	National Academy of Sciences Top agencies DOI (Department of the Interior)	$260,524	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Turner Construction Company Through Sociedad Espanola De Montajes Industriales SA Top agencies USAF (Department of the Air Force)	$250,334	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Pitlik & Wick, Inc. Top agencies USDA (Department of Agriculture)	$249,212	0.1%	Rank history: #61 in FY2022, #83 in FY2023, #88 in FY2024 and not on the FY2025 list; down 14 since FY2020.
83	Timothy E. Patrick Top agencies DOI (Department of the Interior)	$246,523	0.1%	Rank history: not on the FY2022–FY2025 lists; down 36 since FY2020.
84	Miscelaneos Security Services Sociedad Anonima Top agencies DOS (Department of State)	$244,485	0.1%	Rank history: not on the FY2022–FY2025 lists; up 165 since FY2020.
85	C.h. Ingenieria Y Proyectos, SRL Top agencies DOS (Department of State)	$243,700	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Cobb Electric Membership Corporation Through Gas South, LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$242,924	0.1%	Rank history: #26 in FY2022, #37 in FY2023, not on the FY2024 list and #50 in FY2025; up 25 since FY2020.
87	Willard Quarries, Inc. Top agencies Army (Department of the Army)	$240,531	0.1%	Rank history: #74 in FY2022, #46 in FY2023, #27 in FY2024 and #29 in FY2025; down 60 since FY2020.
88	Target Drilling Inc. Top agencies HHS (Department of Health and Human Services)	$238,990	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Capital Sand Co Inc. Top agencies Army (Department of the Army)	$237,800	0.1%	Rank history: not on the FY2022 list, #53 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
90	Vulcan Materials Company 2 awardees Top agencies Army (Department of the Army) DOI (Department of the Interior)	$222,646	0.1%	Rank history: not on the FY2022–FY2025 lists; up 46 since FY2020.
91	Future Services General Trading & Contracting Co. Top agencies Army (Department of the Army)	$222,034	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Tauber Oil Company Through Interconn Resources LLC Top agencies NASA (National Aeronautics and Space Administration) DOJ (Department of Justice)	$221,003	0.1%	Rank history: not on the FY2022 list, #61 in FY2023, #47 in FY2024 and not on the FY2025 list; up 13 since FY2020.
93	FD Inc. Top agencies USAF (Department of the Air Force)	$218,722	0.1%	Rank history: #81 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
94	Clark Construction Co Inc Allen Top agencies DOI (Department of the Interior)	$215,250	0.1%	Rank history: #72 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2020.
95	Jet Stream Fuels, Inc. Top agencies SSA (Social Security Administration)	$213,515	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	E.m. Oil Transport, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$213,508	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Vitagis / CM Mitchell Construction Joint Venture LLC Top agencies Navy (Department of the Navy)	$212,330	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	D7, LLC Top agencies Army (Department of the Army)	$211,310	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	J Brothers Trucking & Excavation, LLC Top agencies USAF (Department of the Air Force)	$199,993	0.1%	Rank history: not on the FY2022–FY2024 lists and #54 in FY2025; down 76 since FY2020.
100	Polar King International, Inc. Top agencies DOJ (Department of Justice)	$199,577	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 478 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 21

Code	Net obligations	Largest contractor
213 Support Activities for Mining	$130,359,291	Arctic Slope Regional Corporation
212 Mining (except Oil and Gas)	$86,221,573	Usibelli Coal Mine, Inc.
211 Oil and Gas Extraction	$31,188,184	Exelon 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 $275 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 FY2021?

1. Arctic Slope Regional Corporation ($51.6M), 2. Tetra Tech-Maytag Aircraft Corporation Joint Venture ($38.7M), 3. Usibelli Coal Mine, Inc. ($30.9M), 4. Weston Solutions Holdings, Inc. ($25.1M), 5. Pond Constructors Inc. ($6.23M), 6. Exelon Corporation ($5.97M), 7. Tiger Natural Gas, Inc. ($5.75M), 8. Crowley Holdings LLC ($4.93M), 9. Interagency Readiness Solutions, LLC ($3.24M), 10. Sage Energy Trading LLC ($2.9M).

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