Top 100 Contractors in NAICS 3251: Basic Chemical Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 3251: Basic Chemical Manufacturing, FY2021
Creator: GovTribe

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

The top 10 won 70% of FY2021 NAICS 3251 contract dollars

Contract obligations: $349,507,398 Net of deobligations, by contracts coded NAICS 3251 or a code under it
Contractors: 483 Parent companies with an obligation
Largest contractor: Mid-America Conversion Services, LLC $128 million, 32.7% 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	Mid-America Conversion Services, LLC Top agencies DOE (Department of Energy)	$127,944,659	32.7%	Rank history: #1 in FY2022, #2 in FY2023, #2 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Air Products and Chemicals, Inc. Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$41,428,553	10.6%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; up 1 since FY2020.
3	Nuclear Fuel Services Inc. Top agencies DOE (Department of Energy)	$22,035,318	5.6%	Rank history: not on the FY2022 list, #8 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
4	Praxair Distribution Inc. 12 awardees, including Linde Inc., Linde Gas & Equipment Inc. and Linde Gas Espana, S.A. Top agencies DLA (Defense Logistics Agency) NASA (National Aeronautics and Space Administration) HHS (Department of Health and Human Services)	$19,698,381	5.0%	Rank history: #3 in FY2022, not on the FY2023 list, #18 in FY2024 and not on the FY2025 list; unchanged since FY2020.
5	Airgas Inc. 21 awardees, including Airgas Usa, LLC, Air Liquide Industrial U.s. LP and Air Liquide America L.P. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) Navy (Department of the Navy)	$19,266,642	4.9%	Rank history: #6 in FY2022, #20 in FY2023, #67 in FY2024 and #93 in FY2025; down 3 since FY2020.
6	RAS Enterprises LLC Top agencies VA (Department of Veterans Affairs) DOE (Department of Energy) Army (Department of the Army)	$11,549,222	2.9%	Rank history: #9 in FY2022, #10 in FY2023, #10 in FY2024 and #9 in FY2025; unchanged since FY2020.
7	Linde LLC 2 awardees, including Messer LLC and Messer Gas Puerto Rico Inc. Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Treasury (Department of the Treasury)	$11,039,753	2.8%	Rank history: #7 in FY2022, #5 in FY2023, #9 in FY2024 and #14 in FY2025; down 2 since FY2020.
8	Lonza Group AG 2 awardees, including Calca Solutions, LLC and Lonza LLC Top agencies DLA (Defense Logistics Agency) Treasury (Department of the Treasury)	$9,524,430	2.4%	Rank history: #15 in FY2022, #4 in FY2023, #26 in FY2024 and not on the FY2025 list; up 102 since FY2020.
9	Cliffside Refiners L P Top agencies DOI (Department of the Interior)	$6,000,000	1.5%	Rank history: #11 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
10	Matheson TRI-Gas Inc. 4 awardees, including Nippon Sanso Matheson, Inc. and Nippon Sanso Deutschland GMBH Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$5,426,961	1.4%	Rank history: #10 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
11	CF Industries Holdings Inc. Through CF Industries Nitrogen LLC Top agencies DLA (Defense Logistics Agency)	$5,067,408	1.3%	Rank history: #5 in FY2022, #17 in FY2023, #25 in FY2024 and not on the FY2025 list; up 86 since FY2020.
12	UK Abrasives Inc. Top agencies DLA (Defense Logistics Agency)	$3,720,764	0.9%	Rank history: not on the FY2022 list, #22 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
13	Emergency Physicians Medical Group P.C. 3 awardees, including Biosearch Technologies, Inc. and VHG Labs Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$3,039,279	0.8%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; up 311 since FY2020.
14	Kuehne Chemical Company, Inc. Top agencies Army (Department of the Army)	$2,348,544	0.6%	Rank history: #18 in FY2022, #26 in FY2023, #20 in FY2024 and #30 in FY2025; down 1 since FY2020.
15	G.e. Chaplin, Inc. Top agencies DLA (Defense Logistics Agency)	$2,246,400	0.6%	Rank history: not on the FY2022 list, #7 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
16	Dixie Chemical Company, Inc. Top agencies DLA (Defense Logistics Agency)	$1,988,793	0.5%	Rank history: #27 in FY2022, #14 in FY2023, #21 in FY2024 and not on the FY2025 list; up 219 since FY2020.
17	Green Lantern, LLC Top agencies Army (Department of the Army) Commerce (Department of Commerce) HHS (Department of Health and Human Services)	$1,903,933	0.5%	Rank history: #19 in FY2022, #30 in FY2023, #29 in FY2024 and #31 in FY2025; unchanged since FY2020.
18	Inchcape Shipping Services Dubai LLC Top agencies DLA (Defense Logistics Agency)	$1,896,507	0.5%	Rank history: #25 in FY2022, #40 in FY2023, #30 in FY2024 and #37 in FY2025; unchanged since FY2020.
19	DPA Investments Inc. Through Usalco, LLC Top agencies Army (Department of the Army)	$1,881,560	0.5%	Rank history: #16 in FY2022, #23 in FY2023, #37 in FY2024 and not on the FY2025 list; down 8 since FY2020.
20	Global Gases Group FZE Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$1,877,072	0.5%	Rank history: #17 in FY2022, #21 in FY2023, #65 in FY2024 and #27 in FY2025; down 10 since FY2020.
21	Danaher Corporation 4 awardees, including Integrated DNA Technologies, Inc., Chemtreat, Inc. and Leica Microsystems Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) VA (Department of Veterans Affairs)	$1,824,487	0.5%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
22	Resintech Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,361,887	0.3%	Rank history: #31 in FY2022, #27 in FY2023, #39 in FY2024 and #47 in FY2025; up 13 since FY2020.
23	RCG of North Carolina, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$1,334,171	0.3%	Rank history: #14 in FY2022, #13 in FY2023, #12 in FY2024 and #12 in FY2025; up 16 since FY2020.
24	Nation Ford Chemical Co Top agencies Army (Department of the Army)	$1,279,850	0.3%	Rank history: not on the FY2022 list, #16 in FY2023, #59 in FY2024 and #17 in FY2025; down 12 since FY2020.
25	Roberts Oxygen Co Inc. Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency) DHS (Department of Homeland Security)	$1,261,755	0.3%	Rank history: #30 in FY2022, #29 in FY2023, #22 in FY2024 and #26 in FY2025; unchanged since FY2020.
26	Amerochem Corporation Top agencies Navy (Department of the Navy)	$1,256,505	0.3%	Rank history: #24 in FY2022, #28 in FY2023, #23 in FY2024 and #41 in FY2025; down 12 since FY2020.
27	Suffolk Solutions, Inc. Top agencies Army (Department of the Army)	$1,203,379	0.3%	Rank history: #20 in FY2022, not on the FY2023–FY2024 lists and #49 in FY2025; up 18 since FY2020.
28	ROY Smith Company Top agencies Army (Department of the Army)	$1,144,163	0.3%	Rank history: not on the FY2022 list, #24 in FY2023, #40 in FY2024 and #38 in FY2025; down 7 since FY2020.
29	Goodrich Gas Inc. Top agencies Army (Department of the Army)	$1,137,056	0.3%	Rank history: #22 in FY2022, #33 in FY2023, #43 in FY2024 and #44 in FY2025; up 7 since FY2020.
30	TMG Gases, Inc. Top agencies Army (Department of the Army) Commerce (Department of Commerce) HHS (Department of Health and Human Services)	$1,004,853	0.3%	Rank history: #93 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
31	Messer LLC Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency)	$944,969	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	R & M Government Services Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$910,612	0.2%	Rank history: #46 in FY2022, not on the FY2023 list, #81 in FY2024 and not on the FY2025 list; down 10 since FY2020.
33	City Chemical LLC Top agencies Navy (Department of the Navy)	$887,546	0.2%	Rank history: #35 in FY2022, #38 in FY2023, #28 in FY2024 and #33 in FY2025; up 7 since FY2020.
34	Carus LLC Top agencies Army (Department of the Army)	$844,169	0.2%	Rank history: #34 in FY2022, #76 in FY2023, #35 in FY2024 and #59 in FY2025; up 13 since FY2020.
35	The Gas Company, LLC Top agencies Navy (Department of the Navy)	$833,531	0.2%	Rank history: #26 in FY2022, #32 in FY2023, #61 in FY2024 and not on the FY2025 list; down 19 since FY2020.
36	Tangram Chemical LLC Top agencies Navy (Department of the Navy)	$800,415	0.2%	Rank history: #28 in FY2022, #34 in FY2023, #64 in FY2024 and #51 in FY2025; down 12 since FY2020.
37	Marianas Gas Corp Top agencies DHA (Defense Health Agency) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$759,121	0.2%	Rank history: #45 in FY2022, #41 in FY2023, #52 in FY2024 and #43 in FY2025; down 9 since FY2020.
38	GC3 Specialty Chemicals Inc. Top agencies Army (Department of the Army)	$758,160	0.2%	Rank history: #41 in FY2022, not on the FY2023–FY2024 lists and #73 in FY2025; up 57 since FY2020.
39	Merrimac Petroleum, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$645,879	0.2%	Rank history: #42 in FY2022, #51 in FY2023, #54 in FY2024 and #95 in FY2025; up 77 since FY2020.
40	S.j. Smith Co., Inc. Top agencies Army (Department of the Army)	$616,257	0.2%	Rank history: not on the FY2022 list, #62 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
41	Medical Equipment & Supplies of America LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DOJ (Department of Justice)	$602,576	0.2%	Rank history: #33 in FY2022, #48 in FY2023, #42 in FY2024 and #36 in FY2025; up 11 since FY2020.
42	Government Scientific Source Inc. Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services) Army (Department of the Army)	$602,495	0.2%	Rank history: #62 in FY2022, #43 in FY2023, #66 in FY2024 and #86 in FY2025; up 64 since FY2020.
43	Daiichi Bussan Co., Ltd. 2 awardees Top agencies USAF (Department of the Air Force)	$594,438	0.2%	Rank history: #50 in FY2022, #57 in FY2023, #79 in FY2024 and #72 in FY2025; up 159 since FY2020.
44	Dubois Chemicals Inc. Top agencies Army (Department of the Army)	$575,256	0.1%	Rank history: #43 in FY2022, not on the FY2023 list, #57 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
45	Steward Advanced Materials LLC Top agencies Navy (Department of the Navy)	$571,135	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Strategic Consulting Alliances, LLC Top agencies Army (Department of the Army)	$543,631	0.1%	Rank history: not on the FY2022 list, #52 in FY2023, #41 in FY2024 and #62 in FY2025; new, not ranked in FY2020.
47	Nexair LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) DHA (Defense Health Agency)	$519,825	0.1%	Rank history: #58 in FY2022, #61 in FY2023, #47 in FY2024 and #64 in FY2025; up 14 since FY2020.
48	North American Refrigerants Inc. Top agencies NASA (National Aeronautics and Space Administration)	$494,400	0.1%	Rank history: not on the FY2022 list, #71 in FY2023, #34 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
49	Expert Depot S.R.L. Top agencies Navy (Department of the Navy)	$443,182	0.1%	Rank history: #97 in FY2022, #87 in FY2023, #82 in FY2024 and not on the FY2025 list; up 20 since FY2020.
50	Polydyne Inc. Top agencies Army (Department of the Army)	$442,741	0.1%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; up 13 since FY2020.
51	Stripes Global, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$433,156	0.1%	Rank history: not on the FY2022 list, #67 in FY2023, #50 in FY2024 and #56 in FY2025; down 10 since FY2020.
52	Mcgean-Rohco Inc. Top agencies USAF (Department of the Air Force)	$419,982	0.1%	Rank history: #36 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
53	Diamond Geeks, Corp. Through Dgci Corporation Top agencies DLA (Defense Logistics Agency)	$411,680	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Chuo Shoko Co., Ltd Top agencies Navy (Department of the Navy)	$401,200	0.1%	Rank history: #59 in FY2022, #75 in FY2023, #96 in FY2024 and not on the FY2025 list; up 34 since FY2020.
55	The Sherwin-Williams Company 2 awardees Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$387,472	0.1%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
56	Kelvin International Corporation Top agencies Navy (Department of the Navy)	$384,393	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	KAP Technochem Usa, Inc. Top agencies Army (Department of the Army)	$380,820	0.1%	Rank history: not on the FY2022 list, #44 in FY2023, not on the FY2024 list and #82 in FY2025; up 93 since FY2020.
58	International Gas & Services Top agencies DLA (Defense Logistics Agency)	$376,049	0.1%	Rank history: #60 in FY2022, #72 in FY2023, #87 in FY2024 and #90 in FY2025; down 4 since FY2020.
59	Cayman Chemical Co Inc. Top agencies DOJ (Department of Justice) EPA (Environmental Protection Agency) DHA (Defense Health Agency)	$361,805	0.1%	Rank history: #83 in FY2022, #77 in FY2023, #91 in FY2024 and not on the FY2025 list; up 13 since FY2020.
60	ASA Environmental Products Inc. Top agencies Navy (Department of the Navy)	$340,032	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Gasochem International, Llc. Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$338,735	0.1%	Rank history: not on the FY2022–FY2023 lists, #60 in FY2024 and #67 in FY2025; up 53 since FY2020.
62	Cryo-Express, LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$324,972	0.1%	Rank history: #56 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; down 30 since FY2020.
63	Temple Engineering Inc. Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$315,360	0.1%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
64	Nippon Sanso Matheson, Inc. Top agencies DLA (Defense Logistics Agency) NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$314,455	0.1%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
65	Hill Brothers Chemical Company Top agencies DOI (Department of the Interior)	$285,541	0.1%	Rank history: #92 in FY2022, #64 in FY2023, #99 in FY2024 and #71 in FY2025; up 88 since FY2020.
66	Powder Alloy Corporation Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$272,860	0.1%	Rank history: not on the FY2022 list, #74 in FY2023, #55 in FY2024 and not on the FY2025 list; down 8 since FY2020.
67	Industrial Chemicals Corporation Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$271,223	0.1%	Rank history: #53 in FY2022, #100 in FY2023, #77 in FY2024 and not on the FY2025 list; up 93 since FY2020.
68	Thermo Electron Corporation 5 awardees, including Life Technologies Corporation, EP Scientific Products LLC and Fisher Scientific Company L.L.C. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) Smithsonian (Smithsonian Institution)	$265,480	0.1%	Rank history: #65 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; down 18 since FY2020.
69	Northstar Chemical, Inc. Top agencies Army (Department of the Army)	$265,251	0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
70	Arc3 Gases, Inc. 5 awardees, including Arcet Equipment Co Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) DHS (Department of Homeland Security)	$260,266	0.1%	Rank history: #77 in FY2022, #85 in FY2023, #92 in FY2024 and #94 in FY2025; up 69 since FY2020.
71	Oerlikon Metco (US) Inc. Top agencies USAF (Department of the Air Force)	$251,539	0.1%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
72	Phoenix V LLC Top agencies Army (Department of the Army)	$250,147	0.1%	Rank history: #70 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
73	Tricon Chemical Corporation Top agencies Army (Department of the Army)	$246,560	0.1%	Rank history: not on the FY2022–FY2025 lists; up 96 since FY2020.
74	Norco Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) Navy (Department of the Navy)	$241,606	0.1%	Rank history: not on the FY2022 list, #73 in FY2023, #83 in FY2024 and not on the FY2025 list; up 24 since FY2020.
75	Federal Resources Supply Company Top agencies DLA (Defense Logistics Agency)	$241,099	0.1%	Rank history: #79 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; up 46 since FY2020.
76	Airgas Usa, LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) Navy (Department of the Navy)	$236,928	0.1%	Rank history: not on the FY2022 list, #6 in FY2023, #11 in FY2024 and #5 in FY2025; down 14 since FY2020.
77	Buzwair Industrial Gases Factories Top agencies USAF (Department of the Air Force)	$236,567	0.1%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
78	Mach I, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$233,920	0.1%	Rank history: not on the FY2022–FY2025 lists; up 42 since FY2020.
79	JE Hurley Inc. Top agencies Army (Department of the Army)	$230,000	0.1%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; down 24 since FY2020.
80	Haun Welding Supply Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) VA (Department of Veterans Affairs)	$229,996	0.1%	Rank history: #75 in FY2022, not on the FY2023–FY2024 lists and #85 in FY2025; up 35 since FY2020.
81	Mriglobal Top agencies HHS (Department of Health and Human Services)	$228,800	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Select Gases, LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$226,578	0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
83	Brenntag NV Through Brenntag Lubricants LLC Top agencies Army (Department of the Army)	$224,352	0.1%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
84	Capitol Carbonic Corp Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force) Commerce (Department of Commerce)	$220,168	0.1%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
85	Wayne State University Top agencies Navy (Department of the Navy)	$219,223	0.1%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 17 since FY2020.
86	Intelligent Material Solutions, Inc. Top agencies Army (Department of the Army)	$216,000	0.1%	Rank history: #37 in FY2022, #59 in FY2023, #90 in FY2024 and not on the FY2025 list; down 12 since FY2020.
87	Leland Limited Inc. Top agencies DLA (Defense Logistics Agency)	$208,315	0.1%	Rank history: #61 in FY2022, not on the FY2023 list, #19 in FY2024 and #88 in FY2025; up 43 since FY2020.
88	3T Federal Solutions LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) Commerce (Department of Commerce)	$207,495	0.1%	Rank history: not on the FY2022–FY2025 lists; up 55 since FY2020.
89	Boston Scientific Corp Through Biocompatibles, Inc. Top agencies VA (Department of Veterans Affairs)	$204,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Veteran Chemicals, Inc. Top agencies Commerce (Department of Commerce) Army (Department of the Army)	$203,440	0.1%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
91	AGP LLC Top agencies VA (Department of Veterans Affairs) EPA (Environmental Protection Agency)	$203,100	0.1%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
92	Eagle Home Medical Corp Top agencies VA (Department of Veterans Affairs)	$201,371	0.1%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; down 35 since FY2020.
93	Gallup Welders Supply Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$197,503	0.1%	Rank history: #71 in FY2022, #88 in FY2023, #97 in FY2024 and not on the FY2025 list; up 58 since FY2020.
94	General Distributing Co Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$188,868	<0.1%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 41 since FY2020.
95	Suburban Propane Partners, L.P Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$179,132	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 41 since FY2020.
96	General Atomic Technologies Corporation Through General Atomics International Services Corp Top agencies USAF (Department of the Air Force)	$175,660	<0.1%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
97	Reclamation Technologies Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$169,920	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 22 since FY2020.
98	BC Market Solutions LLC Top agencies Navy (Department of the Navy)	$166,698	<0.1%	Rank history: not on the FY2022–FY2023 lists, #98 in FY2024 and not on the FY2025 list; up 2 since FY2020.
99	Bogue Systems Inc. Top agencies Navy (Department of the Navy)	$166,350	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Earth Science Laboratories Inc. Top agencies Army (Department of the Army)	$165,358	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.

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100 of 483 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 3251

Code	Net obligations	Largest contractor
32518 Other Basic Inorganic Chemical Manufacturing	$181,328,505	Mid-America Conversion Services, LLC
32512 Industrial Gas Manufacturing	$150,629,504	Air Products and Chemicals, Inc.
32519 Other Basic Organic Chemical Manufacturing	$15,379,033	Emergency Physicians Medical Group P.C.

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 $392 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 3251 contractors in FY2021?

1. Mid-America Conversion Services, LLC ($128M), 2. Air Products and Chemicals, Inc. ($41.4M), 3. Nuclear Fuel Services Inc. ($22M), 4. Praxair Distribution Inc. ($19.7M), 5. Airgas Inc. ($19.3M), 6. RAS Enterprises LLC ($11.5M), 7. Linde LLC ($11M), 8. Lonza Group AG ($9.52M), 9. Cliffside Refiners L P ($6M), 10. Matheson TRI-Gas Inc. ($5.43M).

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