Top 100 Contractors in NAICS 3324: Boiler, Tank, and Shipping Container Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 3324: Boiler, Tank, and Shipping Container Manufacturing, FY2021
Creator: GovTribe

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

The top 10 won 96% of FY2021 NAICS 3324 contract dollars

Contract obligations: $3,338,921,959 Net of deobligations, by contracts coded NAICS 3324 or a code under it
Contractors: 780 Parent companies with an obligation
Largest contractor: Bechtel Corp $2 billion, 59.6% 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	Bechtel Corp Through Bechtel Plant Machinery, Inc. Top agencies Navy (Department of the Navy)	$2,000,472,737	59.6%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Government of the United States Through Department of Energy Top agencies Navy (Department of the Navy)	$1,071,074,048	31.9%	Rank history: #2 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
3	BOH Environmental, L.L.C. Top agencies DLA (Defense Logistics Agency)	$47,601,275	1.4%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; unchanged since FY2020.
4	Aarcorp 2 awardees, including AAR Manufacturing, Inc. and AAR Supply Chain, Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) USAF (Department of the Air Force)	$24,267,592	0.7%	Rank history: #5 in FY2022, #7 in FY2023, #20 in FY2024 and not on the FY2025 list; up 2 since FY2020.
5	Sea Box, Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$20,302,963	0.6%	Rank history: #6 in FY2022, #4 in FY2023, #4 in FY2024 and #12 in FY2025; down 1 since FY2020.
6	Production Products Manufacturing & Sales Co., Inc. Top agencies Army (Department of the Army)	$13,675,611	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
7	Huntington Ingalls Industries, Inc. Through Huntington Ingalls Inc. Top agencies Navy (Department of the Navy)	$9,935,777	0.3%	Rank history: #7 in FY2022, #8 in FY2023, #8 in FY2024 and #9 in FY2025; up 3 since FY2020.
8	W&K Container, Inc. Top agencies DLA (Defense Logistics Agency)	$9,455,991	0.3%	Rank history: #14 in FY2022, #13 in FY2023, #9 in FY2024 and #11 in FY2025; down 3 since FY2020.
9	Isometrics Inc. Top agencies Army (Department of the Army)	$7,853,840	0.2%	Rank history: not on the FY2022–FY2023 lists, #10 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
10	Container Research Corp Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$6,778,519	0.2%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
11	Readyone Industries Inc. Top agencies Army (Department of the Army)	$6,207,290	0.2%	Rank history: #16 in FY2022, #5 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
12	Erie Engineered Products, Inc. Top agencies Navy (Department of the Navy)	$6,155,569	0.2%	Rank history: not on the FY2022 list, #17 in FY2023, not on the FY2024 list and #24 in FY2025; down 5 since FY2020.
13	Essex Industries Inc. Top agencies USAF (Department of the Air Force)	$5,298,785	0.2%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
14	Kelvin International Corporation Top agencies Navy (Department of the Navy)	$4,856,415	0.1%	Rank history: #13 in FY2022 and not on the FY2023–FY2025 lists; up 32 since FY2020.
15	Dan Enterprises Team LLC Top agencies DOJ (Department of Justice)	$4,316,274	0.1%	Rank history: not on the FY2022–FY2025 lists; up 229 since FY2020.
16	Nexgen Composites LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$4,038,725	0.1%	Rank history: #11 in FY2022, #29 in FY2023, #17 in FY2024 and #21 in FY2025; up 4 since FY2020.
17	Sharkcage Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$4,012,909	0.1%	Rank history: #10 in FY2022, #6 in FY2023, #11 in FY2024 and #10 in FY2025; up 16 since FY2020.
18	Sono International LLC Top agencies DLA (Defense Logistics Agency)	$3,834,823	0.1%	Rank history: #15 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
19	Garrett Container Systems, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$3,360,215	0.1%	Rank history: #24 in FY2022, #11 in FY2023, #25 in FY2024 and #33 in FY2025; unchanged since FY2020.
20	Xylem Inc. Through Fluid Handling LLC Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$3,263,436	0.1%	Rank history: #26 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
21	Sesolinc Grp, Inc. Top agencies DLA (Defense Logistics Agency)	$3,201,942	0.1%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
22	Conco, Inc. Top agencies Army (Department of the Army)	$2,426,016	0.1%	Rank history: #4 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; down 5 since FY2020.
23	Hunter Defense Technolog 2 awardees, including Berg Manufacturing, Inc. and HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$2,360,758	0.1%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
24	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,352,132	0.1%	Rank history: not on the FY2022–FY2023 lists, #42 in FY2024 and #41 in FY2025; up 110 since FY2020.
25	Intrepid Eagle Logistics, Inc. Top agencies DLA (Defense Logistics Agency)	$2,056,005	0.1%	Rank history: #27 in FY2022, #44 in FY2023, #5 in FY2024 and #15 in FY2025; down 10 since FY2020.
26	Bollinger Shipyards Inc Through Chand, L.L.C. Top agencies DLA (Defense Logistics Agency)	$1,837,264	0.1%	Rank history: #68 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; up 35 since FY2020.
27	Saudi Co for Prefabricated Buildings Top agencies USAF (Department of the Air Force)	$1,502,150	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Fourinox, Inc. Top agencies Navy (Department of the Navy)	$1,455,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	Riggins Company, L.C. Top agencies Navy (Department of the Navy)	$1,372,766	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	FAST Works Company for General Trading Ltd Top agencies Army (Department of the Army)	$1,175,101	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	Greene Machine & Manufacturing Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$1,104,446	<0.1%	Rank history: #42 in FY2022, #22 in FY2023, #22 in FY2024 and #26 in FY2025; down 4 since FY2020.
32	B UND T Marketing GMBH Top agencies DLA (Defense Logistics Agency)	$1,056,301	<0.1%	Rank history: #28 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 52 since FY2020.
33	The Champion Company Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,017,659	<0.1%	Rank history: #8 in FY2022, #24 in FY2023, not on the FY2024 list and #69 in FY2025; down 1 since FY2020.
34	Aaecon General Contracting LLC Top agencies USAF (Department of the Air Force)	$995,799	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	S I T Corporation Top agencies DLA (Defense Logistics Agency)	$974,718	<0.1%	Rank history: not on the FY2022 list, #43 in FY2023, #41 in FY2024 and #94 in FY2025; up 28 since FY2020.
36	Aero Precision Industries LLC Through Allclear Aerospace & Defense, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$965,757	<0.1%	Rank history: #45 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
37	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$952,971	<0.1%	Rank history: #64 in FY2022, #38 in FY2023, #30 in FY2024 and #16 in FY2025; up 73 since FY2020.
38	Dibert Valve and Fitting Company, Incorporated Top agencies Navy (Department of the Navy)	$928,419	<0.1%	Rank history: #56 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
39	Brooks & Perkins, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$921,023	<0.1%	Rank history: #9 in FY2022, #9 in FY2023, #13 in FY2024 and #7 in FY2025; down 31 since FY2020.
40	Aqua-Chem, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$899,633	<0.1%	Rank history: #21 in FY2022, #26 in FY2023, #27 in FY2024 and #20 in FY2025; down 24 since FY2020.
41	GTA Drum, Inc. Top agencies DLA (Defense Logistics Agency)	$888,165	<0.1%	Rank history: #55 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
42	Pelican Products, Inc. Through Hardigg Industries, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$883,714	<0.1%	Rank history: #60 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; down 17 since FY2020.
43	Maro & Associates Inc. Top agencies DLA (Defense Logistics Agency)	$841,772	<0.1%	Rank history: #75 in FY2022, not on the FY2023 list, #16 in FY2024 and not on the FY2025 list; up 6 since FY2020.
44	Ameripack Inc. Top agencies DLA (Defense Logistics Agency)	$818,241	<0.1%	Rank history: #29 in FY2022, #40 in FY2023, #100 in FY2024 and not on the FY2025 list; down 14 since FY2020.
45	GTA Containers, Inc. Top agencies DLA (Defense Logistics Agency)	$784,455	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
46	Compumeric Engineering, Inc. 2 awardees Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$720,936	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
47	Energysolutions LLC Through Energysolutions Services Inc. Top agencies Navy (Department of the Navy)	$685,317	<0.1%	Rank history: #41 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; up 62 since FY2020.
48	Prentex Alloy Fabricators, Inc. Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$651,837	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
49	Becklin Holdings, Inc. Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army) Navy (Department of the Navy)	$622,575	<0.1%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; up 243 since FY2020.
50	Teal, LLC Top agencies DLA (Defense Logistics Agency) DOI (Department of the Interior)	$615,660	<0.1%	Rank history: not on the FY2022–FY2024 lists and #86 in FY2025; up 63 since FY2020.
51	Northrop Grumman Corporation Through Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy)	$612,125	<0.1%	Rank history: not on the FY2022 list, #25 in FY2023, not on the FY2024 list and #34 in FY2025; up 54 since FY2020.
52	Xchanger Manufacturing Corporation Top agencies DLA (Defense Logistics Agency)	$601,620	<0.1%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
53	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$593,470	<0.1%	Rank history: #74 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 34 since FY2020.
54	Simpson Alloy Services Inc. Top agencies USAF (Department of the Air Force)	$590,789	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Mayers Industries Corp Top agencies Army (Department of the Army)	$585,905	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Star Capital Defense Contracting and General Maintenance LLC Top agencies USAF (Department of the Air Force)	$584,806	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Avid Ironworks, Inc. Top agencies USDA (Department of Agriculture)	$573,800	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Phoenix Contracting LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$515,226	<0.1%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; up 227 since FY2020.
59	Brimhall Industrial Inc. Top agencies DOI (Department of the Interior)	$506,161	<0.1%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
60	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$505,277	<0.1%	Rank history: #52 in FY2022, not on the FY2023 list, #44 in FY2024 and #63 in FY2025; down 13 since FY2020.
61	Bristlecone Ventures 2 LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$494,722	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Aerolab LLC Top agencies Navy (Department of the Navy)	$492,300	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Ivan Ware & Son, LLC Top agencies VA (Department of Veterans Affairs)	$475,744	<0.1%	Rank history: #87 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; up 51 since FY2020.
64	Aantilia LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$469,499	<0.1%	Rank history: not on the FY2022–FY2023 lists, #76 in FY2024 and not on the FY2025 list; up 283 since FY2020.
65	Integrated Procurement Technologies Top agencies Navy (Department of the Navy)	$461,340	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 81 since FY2020.
66	Highland Engineering, Inc. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$450,202	<0.1%	Rank history: #19 in FY2022, #65 in FY2023, #40 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
67	Patriot Mechanical, LLC Top agencies USAF (Department of the Air Force)	$415,170	<0.1%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
68	Phoenix Systems Engineering Inc. Top agencies DLA (Defense Logistics Agency)	$412,501	<0.1%	Rank history: not on the FY2022–FY2023 lists, #86 in FY2024 and not on the FY2025 list; down 2 since FY2020.
69	Advanced Packaging LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$404,997	<0.1%	Rank history: #23 in FY2022, #34 in FY2023, not on the FY2024 list and #58 in FY2025; up 231 since FY2020.
70	Caldaia Controls LLC Top agencies VA (Department of Veterans Affairs)	$395,145	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Container Products Corporation Top agencies Navy (Department of the Navy)	$393,924	<0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
72	Lockheed Martin Corporation 2 awardees Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$383,998	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Eagle General Services, Inc. Top agencies USAF (Department of the Air Force)	$377,650	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Statz Corp Top agencies DLA (Defense Logistics Agency)	$373,221	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 201 since FY2020.
75	Dupont De Nemours, Inc. Through Mecs, Inc. Top agencies Navy (Department of the Navy)	$373,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency)	$370,754	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 101 since FY2020.
77	Boss Innovation & Marketing Inc. Top agencies DOJ (Department of Justice)	$327,136	<0.1%	Rank history: #53 in FY2022, #63 in FY2023, #62 in FY2024 and #65 in FY2025; down 9 since FY2020.
78	Stanley Black & Decker, Inc. Through Black & Decker (U.s.) Inc. Top agencies Navy (Department of the Navy)	$325,041	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 382 since FY2020.
79	Sericore LLC Top agencies Navy (Department of the Navy)	$320,806	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Painter Tool Incorporated Top agencies Navy (Department of the Navy)	$320,040	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	STS Operating, Inc. Top agencies Army (Department of the Army)	$319,200	<0.1%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
82	Armor Metal Group Mason Incorporated Top agencies DLA (Defense Logistics Agency)	$310,874	<0.1%	Rank history: #30 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
83	Bizon Group, Inc. Top agencies USDA (Department of Agriculture) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$309,705	<0.1%	Rank history: not on the FY2022 list, #88 in FY2023, not on the FY2024 list and #95 in FY2025; down 48 since FY2020.
84	Theodor Wille Intertrade GMBH Through Atlantic Diving Supply, Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$304,577	<0.1%	Rank history: #17 in FY2022, #12 in FY2023, #73 in FY2024 and not on the FY2025 list; down 1 since FY2020.
85	Applied Cooling Technology, LLC Top agencies Navy (Department of the Navy) USDA (Department of Agriculture) Army (Department of the Army)	$296,971	<0.1%	Rank history: not on the FY2022–FY2023 lists, #57 in FY2024 and not on the FY2025 list; up 5 since FY2020.
86	PC Vision Inc. Top agencies HHS (Department of Health and Human Services)	$292,077	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Triton Metals, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$282,376	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	AAR Manufacturing, Inc. Top agencies DLA (Defense Logistics Agency)	$280,298	<0.1%	Rank history: not on the FY2022–FY2023 lists, #7 in FY2024 and #4 in FY2025; down 62 since FY2020.
89	Innovative Federal Operations Group, Incorporated Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$275,386	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 207 since FY2020.
90	General Distributing Co Top agencies HHS (Department of Health and Human Services)	$274,458	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Wartsila Defense Inc. Through Defense Maritime Solutions, Inc. Top agencies Army (Department of the Army)	$272,639	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Keymiaee Aero-Tech, Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) Navy (Department of the Navy)	$265,001	<0.1%	Rank history: not on the FY2022 list, #69 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
93	Beaverfit North America LLC Top agencies Army (Department of the Army)	$264,779	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
94	Snap-On Incorporated 2 awardees, including Snap-On Tools International, LLC and Idsc Holdings LLC Top agencies USAF (Department of the Air Force)	$261,569	<0.1%	Rank history: #96 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
95	Avon Rubber P.L.C. Through Avon Protection Systems Incorporated Top agencies DLA (Defense Logistics Agency)	$260,175	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Star Cases LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$258,780	<0.1%	Rank history: not on the FY2022 list, #78 in FY2023 and not on the FY2024–FY2025 lists; up 47 since FY2020.
97	Aviate Enterprises, Inc. Top agencies VA (Department of Veterans Affairs)	$254,663	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Unimex Corporation Through Paragon Defense Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$254,000	<0.1%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
99	Nihon Highway Service Co. Ltd. Top agencies Army (Department of the Army)	$252,568	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Cryo Associates Inc. Top agencies USDA (Department of Agriculture) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$249,677	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 41 since FY2020.

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100 of 780 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 3324

Code	Net obligations	Largest contractor
33241 Power Boiler and Heat Exchanger Manufacturing	$3,107,911,805	Bechtel Corp
33243 Metal Can, Box, and Other Metal Container (Light Gauge) Manufacturing	$197,465,994	BOH Environmental, L.L.C.
33242 Metal Tank (Heavy Gauge) Manufacturing	$33,544,160	Isometrics Inc.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $3.35 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 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 3324 contractors in FY2021?

1. Bechtel Corp ($2B), 2. Government of the United States ($1.07B), 3. BOH Environmental, L.L.C. ($47.6M), 4. Aarcorp ($24.3M), 5. Sea Box, Inc. ($20.3M), 6. Production Products Manufacturing & Sales Co., Inc. ($13.7M), 7. Huntington Ingalls Industries, Inc. ($9.94M), 8. W&K Container, Inc. ($9.46M), 9. Isometrics Inc. ($7.85M), 10. Container Research Corp ($6.78M).

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