Top 100 Contractors in NAICS 3251: Basic Chemical Manufacturing, FY2023

Name: Top 100 Contractors in NAICS 3251: Basic Chemical Manufacturing, FY2023
Creator: GovTribe

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

The top 10 won 74% of FY2023 NAICS 3251 contract dollars

Contract obligations: $667,016,055 Net of deobligations, by contracts coded NAICS 3251 or a code under it
Contractors: 514 Parent companies with an obligation
Largest contractor: Air Products and Chemicals, Inc. $186 million, 25.6% 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	Air Products and Chemicals, Inc. Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$185,708,083	25.6%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2024 and #2 in FY2025; up 1 since FY2022.
2	Mid-America Conversion Services, LLC Top agencies DOE (Department of Energy)	$126,437,600	17.4%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2024 and #1 in FY2025; down 1 since FY2022.
3	BWX Technologies, Inc. 2 awardees, including Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top agencies DOE (Department of Energy)	$111,160,776	15.3%	Rank history: not on the FY2021 list, #4 in FY2022, #3 in FY2024 and #3 in FY2025; up 1 since FY2022.
4	Lonza Group AG 2 awardees, including Calca Solutions, LLC and Lonza LLC Top agencies DLA (Defense Logistics Agency) Treasury (Department of the Treasury)	$29,997,916	4.1%	Rank history: #8 in FY2021, #15 in FY2022, #26 in FY2024 and not on the FY2025 list; up 11 since FY2022.
5	Linde LLC 2 awardees, including Messer LLC and Messer Gas Puerto Rico Inc. Top agencies NASA (National Aeronautics and Space Administration) DOI (Department of the Interior) Treasury (Department of the Treasury)	$29,606,026	4.1%	Rank history: #7 in FY2021, #7 in FY2022, #9 in FY2024 and #14 in FY2025; up 2 since FY2022.
6	Airgas USA LLC 14 awardees, including Air Liquide Sanita\' Service SPA and Airgas Inc. Top agencies DLA (Defense Logistics Agency) Commerce (Department of Commerce) DHA (Defense Health Agency)	$15,986,510	2.2%	Rank history: #76 in FY2021, not on the FY2022 list, #11 in FY2024 and #5 in FY2025; up 141 since FY2022.
7	G.e. Chaplin, Inc. Top agencies DLA (Defense Logistics Agency) Treasury (Department of the Treasury)	$10,679,219	1.5%	Rank history: #15 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
8	Nuclear Fuel Services Inc. Top agencies DOE (Department of Energy)	$10,055,105	1.4%	Rank history: #3 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
9	Cliffside Refiners L P Top agencies DOI (Department of the Interior)	$9,025,426	1.2%	Rank history: #9 in FY2021, #11 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
10	RAS Enterprises LLC Top agencies VA (Department of Veterans Affairs) DOE (Department of Energy) DHA (Defense Health Agency)	$8,895,287	1.2%	Rank history: #6 in FY2021, #9 in FY2022, #10 in FY2024 and #9 in FY2025; down 1 since FY2022.
11	Specialized Materials and Chemicals, LLC Top agencies Army (Department of the Army)	$7,795,800	1.1%	Rank history: not on the FY2021–FY2022 lists, #6 in FY2024 and #25 in FY2025; new.
12	(Rc) 2 Pharma Connect L.L.C. Top agencies DLA (Defense Logistics Agency)	$6,410,742	0.9%	Rank history: not on the FY2021–FY2022 lists, #5 in FY2024 and #11 in FY2025; new.
13	RCG of North Carolina, LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DHA (Defense Health Agency)	$4,744,760	0.7%	Rank history: #23 in FY2021, #14 in FY2022, #12 in FY2024 and #12 in FY2025; up 1 since FY2022.
14	Dixie Chemical Company, Inc. Top agencies DLA (Defense Logistics Agency)	$4,560,405	0.6%	Rank history: #16 in FY2021, #27 in FY2022, #21 in FY2024 and not on the FY2025 list; up 13 since FY2022.
15	The Warwick Supply and Equipment Co., Inc. Top agencies VA (Department of Veterans Affairs)	$4,535,866	0.6%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2024 and #66 in FY2025; new.
16	Nation Ford Chemical Co Top agencies Army (Department of the Army)	$3,849,190	0.5%	Rank history: #24 in FY2021, not on the FY2022 list, #59 in FY2024 and #17 in FY2025; returned.
17	CF Industries Holdings Inc. Through CF Industries Nitrogen LLC Top agencies DLA (Defense Logistics Agency)	$3,644,705	0.5%	Rank history: #11 in FY2021, #5 in FY2022, #25 in FY2024 and not on the FY2025 list; down 12 since FY2022.
18	Paula F Price Enterprises LLC 2 awardees Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$3,397,585	0.5%	Rank history: not on the FY2021 list, #13 in FY2022, #17 in FY2024 and #15 in FY2025; down 5 since FY2022.
19	Matheson TRI-Gas Inc. 3 awardees, including Nippon Sanso Matheson, Inc. and Nippon Sanso Deutschland GMBH Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) NASA (National Aeronautics and Space Administration)	$3,395,589	0.5%	Rank history: #10 in FY2021, #10 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
20	Airgas Inc. 14 awardees, including Airgas Usa, LLC, Air Liquide Italia Service S.R.L. and Airgas Carbonic, Inc. Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$3,222,646	0.4%	Rank history: #5 in FY2021, #6 in FY2022, #67 in FY2024 and #93 in FY2025; down 14 since FY2022.
21	Global Gases Group FZE Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$2,922,322	0.4%	Rank history: #20 in FY2021, #17 in FY2022, #65 in FY2024 and #27 in FY2025; down 4 since FY2022.
22	UK Abrasives Inc. Top agencies DLA (Defense Logistics Agency)	$2,601,655	0.4%	Rank history: #12 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
23	DPA Investments Inc. Through Usalco, LLC Top agencies Army (Department of the Army)	$2,229,323	0.3%	Rank history: #19 in FY2021, #16 in FY2022, #37 in FY2024 and not on the FY2025 list; down 7 since FY2022.
24	ROY Smith Company Top agencies Army (Department of the Army)	$2,205,000	0.3%	Rank history: #28 in FY2021, not on the FY2022 list, #40 in FY2024 and #38 in FY2025; returned.
25	Mitsubishi Chemical Holdings Corporation 3 awardees, including Nippon Sanso Matheson, Inc. and Matheson Tri-Gas, Inc. Top agencies DLA (Defense Logistics Agency) USDA (Department of Agriculture) NASA (National Aeronautics and Space Administration)	$2,110,571	0.3%	Rank history: not on the FY2021–FY2022 lists, #13 in FY2024 and #20 in FY2025; new.
26	Kuehne Chemical Company, Inc. Top agencies Army (Department of the Army)	$2,101,872	0.3%	Rank history: #14 in FY2021, #18 in FY2022, #20 in FY2024 and #30 in FY2025; down 8 since FY2022.
27	Resintech Inc. Top agencies Navy (Department of the Navy)	$2,073,497	0.3%	Rank history: #22 in FY2021, #31 in FY2022, #39 in FY2024 and #47 in FY2025; up 4 since FY2022.
28	Amerochem Corporation Top agencies Navy (Department of the Navy)	$1,969,824	0.3%	Rank history: #26 in FY2021, #24 in FY2022, #23 in FY2024 and #41 in FY2025; down 4 since FY2022.
29	Roberts Oxygen Company Inc. 2 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) EPA (Environmental Protection Agency)	$1,862,861	0.3%	Rank history: #25 in FY2021, #30 in FY2022, #22 in FY2024 and #26 in FY2025; up 1 since FY2022.
30	Green Lantern, LLC Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$1,611,978	0.2%	Rank history: #17 in FY2021, #19 in FY2022, #29 in FY2024 and #31 in FY2025; down 11 since FY2022.
31	Cryo-Express, LLC Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services)	$1,604,354	0.2%	Rank history: #62 in FY2021, #56 in FY2022 and not on the FY2024–FY2025 lists; up 25 since FY2022.
32	The Gas Company, LLC Top agencies Navy (Department of the Navy)	$1,503,591	0.2%	Rank history: #35 in FY2021, #26 in FY2022, #61 in FY2024 and not on the FY2025 list; down 6 since FY2022.
33	Goodrich Gas Inc. Top agencies Army (Department of the Army)	$1,459,879	0.2%	Rank history: #29 in FY2021, #22 in FY2022, #43 in FY2024 and #44 in FY2025; down 11 since FY2022.
34	Tangram Chemical LLC Top agencies Navy (Department of the Navy)	$1,338,989	0.2%	Rank history: #36 in FY2021, #28 in FY2022, #64 in FY2024 and #51 in FY2025; down 6 since FY2022.
35	Chemicals Incorporated Top agencies MDA (DOD Missile Defense Agency)	$1,273,500	0.2%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2024 and not on the FY2025 list; new.
36	Johann Haltermann Ltd. Through Monument Chemical Houston LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,236,600	0.2%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2024 and not on the FY2025 list; new.
37	Buffalo Tungsten Inc. Top agencies Army (Department of the Army)	$1,221,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
38	City Chemical LLC Top agencies Navy (Department of the Navy)	$1,185,298	0.2%	Rank history: #33 in FY2021, #35 in FY2022, #28 in FY2024 and #33 in FY2025; down 3 since FY2022.
39	MP Mine Operations LLC Top agencies DLA (Defense Logistics Agency)	$1,184,040	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
40	Inchcape Shipping Services Dubai LLC Top agencies DLA (Defense Logistics Agency)	$1,177,731	0.2%	Rank history: #18 in FY2021, #25 in FY2022, #30 in FY2024 and #37 in FY2025; down 15 since FY2022.
41	Marianas Gas Corp 2 awardees Top agencies DLA (Defense Logistics Agency) DHA (Defense Health Agency)	$1,163,160	0.2%	Rank history: #37 in FY2021, #45 in FY2022, #52 in FY2024 and #43 in FY2025; up 4 since FY2022.
42	Shilog, Ltd Top agencies Army (Department of the Army)	$1,161,120	0.2%	Rank history: not on the FY2021–FY2022 lists, #24 in FY2024 and #70 in FY2025; up 292 since FY2022.
43	Government Scientific Source Inc. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Navy (Department of the Navy)	$1,070,542	0.1%	Rank history: #42 in FY2021, #62 in FY2022, #66 in FY2024 and #86 in FY2025; up 19 since FY2022.
44	KAP Technochem Usa, Inc. Top agencies Army (Department of the Army)	$1,062,952	0.1%	Rank history: #57 in FY2021, not on the FY2022 list, not on the FY2024 list and #82 in FY2025; up 106 since FY2022.
45	Talon Veteran Services Incorporated Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$1,028,900	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
46	Danaher Corporation 2 awardees, including Integrated DNA Technologies, Inc. and Phenomenex, Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$978,172	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 184 since FY2022.
47	Hudson Technologies, Inc. Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$857,728	0.1%	Rank history: not on the FY2021 list, #44 in FY2022, #58 in FY2024 and #8 in FY2025; down 3 since FY2022.
48	Medical Equipment & Supplies of America LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DOJ (Department of Justice)	$854,613	0.1%	Rank history: #41 in FY2021, #33 in FY2022, #42 in FY2024 and #36 in FY2025; down 15 since FY2022.
49	Dynasty Chemical Corp Top agencies Army (Department of the Army)	$840,504	0.1%	Rank history: not on the FY2021 list, #85 in FY2022 and not on the FY2024–FY2025 lists; up 36 since FY2022.
50	Central Mcgowan Inc. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$792,538	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #99 in FY2025; up 295 since FY2022.
51	Merrimac Petroleum, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$770,490	0.1%	Rank history: #39 in FY2021, #42 in FY2022, #54 in FY2024 and #95 in FY2025; down 9 since FY2022.
52	Strategic Consulting Alliances, LLC Top agencies Army (Department of the Army)	$748,362	0.1%	Rank history: #46 in FY2021, not on the FY2022 list, #41 in FY2024 and #62 in FY2025; up 50 since FY2022.
53	Mcgean-Rohco Inc. Top agencies USAF (Department of the Air Force)	$737,575	0.1%	Rank history: #52 in FY2021, #36 in FY2022 and not on the FY2024–FY2025 lists; down 17 since FY2022.
54	Applied LNG Technologies LLC Top agencies DOI (Department of the Interior)	$713,643	0.1%	Rank history: not on the FY2021 list, #57 in FY2022, not on the FY2024 list and #91 in FY2025; up 3 since FY2022.
55	Showa Chemical Industry Co.,Ltd. Top agencies Navy (Department of the Navy)	$662,272	0.1%	Rank history: not on the FY2021 list, #67 in FY2022, #62 in FY2024 and #55 in FY2025; up 12 since FY2022.
56	Christopher I. Oyolokor SR. Top agencies Army (Department of the Army) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$641,610	0.1%	Rank history: not on the FY2021 list, #48 in FY2022, #70 in FY2024 and #81 in FY2025; down 8 since FY2022.
57	Daiichi Bussan Co . Ltd Top agencies USAF (Department of the Air Force)	$589,099	0.1%	Rank history: #43 in FY2021, #50 in FY2022, #79 in FY2024 and not on the FY2025 list; down 7 since FY2022.
58	Momar, Incorporated Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$578,653	0.1%	Rank history: not on the FY2021 list, #54 in FY2022, #53 in FY2024 and not on the FY2025 list; down 4 since FY2022.
59	Intelligent Material Solutions, Inc. Top agencies Army (Department of the Army)	$574,395	0.1%	Rank history: #86 in FY2021, #37 in FY2022, #90 in FY2024 and not on the FY2025 list; down 22 since FY2022.
60	TMG Gases, Inc. Top agencies Army (Department of the Army) Commerce (Department of Commerce) HHS (Department of Health and Human Services)	$565,296	0.1%	Rank history: #30 in FY2021, #93 in FY2022 and not on the FY2024–FY2025 lists; up 33 since FY2022.
61	Nexair LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$560,242	0.1%	Rank history: #47 in FY2021, #58 in FY2022, #47 in FY2024 and #64 in FY2025; down 3 since FY2022.
62	S.j. Smith Co., Inc. Top agencies Army (Department of the Army)	$558,948	0.1%	Rank history: #40 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 44 since FY2022.
63	Premier Trading Company, LLC Top agencies Army (Department of the Army)	$535,911	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2024 and not on the FY2025 list; new.
64	Hill Brothers Chemical Company Top agencies DOI (Department of the Interior)	$516,373	0.1%	Rank history: #65 in FY2021, #92 in FY2022, #99 in FY2024 and #71 in FY2025; up 28 since FY2022.
65	808 Solutions Inc. Top agencies Navy (Department of the Navy) DHA (Defense Health Agency) Army (Department of the Army)	$497,279	0.1%	Rank history: not on the FY2021 list, #69 in FY2022, not on the FY2024 list and #57 in FY2025; up 4 since FY2022.
66	Scentry Biologicals, Inc. Top agencies USDA (Department of Agriculture)	$497,000	0.1%	Rank history: not on the FY2021–FY2022 lists, #93 in FY2024 and not on the FY2025 list; up 43 since FY2022.
67	Stripes Global, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$487,390	0.1%	Rank history: #51 in FY2021, not on the FY2022 list, #50 in FY2024 and #56 in FY2025; up 104 since FY2022.
68	Water & Energy Systems Technology, Inc. Top agencies USAF (Department of the Air Force)	$484,276	0.1%	Rank history: not on the FY2021 list, #72 in FY2022, #78 in FY2024 and not on the FY2025 list; up 4 since FY2022.
69	Chase Supply, Inc. Top agencies Navy (Department of the Navy)	$465,256	0.1%	Rank history: not on the FY2021–FY2022 lists, #56 in FY2024 and not on the FY2025 list; new.
70	US Military Corp Top agencies Army (Department of the Army) Navy (Department of the Navy)	$464,046	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 50 since FY2022.
71	North American Refrigerants Inc. Top agencies NASA (National Aeronautics and Space Administration)	$459,200	0.1%	Rank history: #48 in FY2021, not on the FY2022 list, #34 in FY2024 and not on the FY2025 list; returned.
72	International Gas & Services Top agencies DLA (Defense Logistics Agency)	$419,750	0.1%	Rank history: #58 in FY2021, #60 in FY2022, #87 in FY2024 and #90 in FY2025; down 12 since FY2022.
73	Norco Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) VA (Department of Veterans Affairs)	$414,016	0.1%	Rank history: #74 in FY2021, not on the FY2022 list, #83 in FY2024 and not on the FY2025 list; up 275 since FY2022.
74	Powder Alloy Corporation Top agencies USAF (Department of the Air Force)	$410,500	0.1%	Rank history: #66 in FY2021, not on the FY2022 list, #55 in FY2024 and not on the FY2025 list; up 141 since FY2022.
75	Chuo Shoko Co., Ltd Top agencies Navy (Department of the Navy)	$408,286	0.1%	Rank history: #54 in FY2021, #59 in FY2022, #96 in FY2024 and not on the FY2025 list; down 16 since FY2022.
76	Carus LLC Top agencies Army (Department of the Army)	$398,980	0.1%	Rank history: #34 in FY2021, #34 in FY2022, #35 in FY2024 and #59 in FY2025; down 42 since FY2022.
77	Cayman Chemical Co Inc. Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$375,879	0.1%	Rank history: #59 in FY2021, #83 in FY2022, #91 in FY2024 and not on the FY2025 list; up 6 since FY2022.
78	Miles Ahead Distribution, Inc. Top agencies Treasury (Department of the Treasury)	$369,263	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 103 since FY2022.
79	General Air Service & Supply Co. Top agencies Commerce (Department of Commerce) EPA (Environmental Protection Agency) DHA (Defense Health Agency)	$363,918	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 64 since FY2022.
80	Phoenix V LLC Top agencies Army (Department of the Army)	$360,479	<0.1%	Rank history: #72 in FY2021, #70 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
81	Island Pyrochemical Industries Corp Top agencies Army (Department of the Army) Navy (Department of the Navy)	$360,022	<0.1%	Rank history: not on the FY2021–FY2022 lists, #49 in FY2024 and #58 in FY2025; new.
82	Condy Holdings LLC Through Carus LLC Top agencies Army (Department of the Army)	$358,131	<0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #65 in FY2025; up 106 since FY2022.
83	Amerigas Propane L.P. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$356,833	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 63 since FY2022.
84	Praxair Puerto Rico BV Through Linde Puerto Rico B.V. Top agencies DLA (Defense Logistics Agency) Commerce (Department of Commerce)	$355,653	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 95 since FY2022.
85	Arc3 Gases, Inc. 4 awardees, including Arcet Equipment Co Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DOJ (Department of Justice)	$348,113	<0.1%	Rank history: #70 in FY2021, #77 in FY2022, #92 in FY2024 and #94 in FY2025; down 8 since FY2022.
86	Federal Resources Supply Company Top agencies DLA (Defense Logistics Agency)	$346,753	<0.1%	Rank history: #75 in FY2021, #79 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
87	Expert Depot S.R.L. Top agencies Navy (Department of the Navy)	$344,626	<0.1%	Rank history: #49 in FY2021, #97 in FY2022, #82 in FY2024 and not on the FY2025 list; up 10 since FY2022.
88	Gallup Welders Supply Inc. 2 awardees Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$336,138	<0.1%	Rank history: #93 in FY2021, #71 in FY2022, #97 in FY2024 and not on the FY2025 list; down 17 since FY2022.
89	Okano, K.K. Top agencies DLA (Defense Logistics Agency) DHA (Defense Health Agency)	$332,140	<0.1%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2024 and not on the FY2025 list; up 63 since FY2022.
90	BSE Performance, LLC Top agencies DLA (Defense Logistics Agency) DOI (Department of the Interior) Army (Department of the Army)	$328,615	<0.1%	Rank history: not on the FY2021 list, #78 in FY2022, #89 in FY2024 and not on the FY2025 list; down 12 since FY2022.
91	Metalcraft, Inc. Top agencies DLA (Defense Logistics Agency)	$322,540	<0.1%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2024 and not on the FY2025 list; new.
92	Maryland Chemical Company, Inc. Top agencies Navy (Department of the Navy)	$319,016	<0.1%	Rank history: not on the FY2021–FY2022 lists, #16 in FY2024 and #53 in FY2025; new.
93	Thermo Electron Corporation 4 awardees, including Life Technologies Corporation and Fisher Scientific Company L.L.C. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) VA (Department of Veterans Affairs)	$296,822	<0.1%	Rank history: #68 in FY2021, #65 in FY2022 and not on the FY2024–FY2025 lists; down 28 since FY2022.
94	Innovative Federal Operations Group, Incorporated Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$292,000	<0.1%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2024 and #89 in FY2025; up 27 since FY2022.
95	Aktin IE J.d.o.o. Top agencies Army (Department of the Army)	$288,417	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
96	AGP LLC Top agencies VA (Department of Veterans Affairs) EPA (Environmental Protection Agency)	$285,252	<0.1%	Rank history: #91 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 20 since FY2022.
97	Waterline Technologies, Inc. Top agencies DOI (Department of the Interior)	$283,311	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 83 since FY2022.
98	Electronic Fluorocarbons, LLC Top agencies NASA (National Aeronautics and Space Administration)	$276,338	<0.1%	Rank history: not on the FY2021 list, #91 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
99	Greer Industries, Inc. Top agencies Army (Department of the Army)	$265,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
100	Industrial Chemicals Corporation Top agencies DOI (Department of the Interior) Treasury (Department of the Treasury)	$263,859	<0.1%	Rank history: #67 in FY2021, #53 in FY2022, #77 in FY2024 and not on the FY2025 list; down 47 since FY2022.

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100 of 514 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 3251

Code	Net obligations	Largest contractor
32512 Industrial Gas Manufacturing	$325,449,404	Air Products and Chemicals, Inc.
32518 Other Basic Inorganic Chemical Manufacturing	$317,980,431	Mid-America Conversion Services, LLC
32519 Other Basic Organic Chemical Manufacturing	$18,737,010	Resintech Inc.
32511 Petrochemical Manufacturing	$389,651	MQM Solutions 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 $727 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 3251 contractors in FY2023?

1. Air Products and Chemicals, Inc. ($186M), 2. Mid-America Conversion Services, LLC ($126M), 3. BWX Technologies, Inc. ($111M), 4. Lonza Group AG ($30M), 5. Linde LLC ($29.6M), 6. Airgas USA LLC ($16M), 7. G.e. Chaplin, Inc. ($10.7M), 8. Nuclear Fuel Services Inc. ($10.1M), 9. Cliffside Refiners L P ($9.03M), 10. RAS Enterprises LLC ($8.9M).

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