Top 100 Contractors in NAICS 3251: Basic Chemical Manufacturing, FY2025

Name: Top 100 Contractors in NAICS 3251: Basic Chemical Manufacturing, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 72% of FY2025 NAICS 3251 contract dollars

Contract obligations: $677,141,231 Net of deobligations, by contracts coded NAICS 3251 or a code under it
Contractors: 534 Parent companies with an obligation
Largest contractor: Mid-America Conversion Services, LLC $112 million, 15.3% 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)	$111,926,378	15.3%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2023 and #2 in FY2024; up 1 since FY2024.
2	Air Products and Chemicals, Inc. Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$106,599,307	14.5%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2023 and #1 in FY2024; down 1 since FY2024.
3	BWX Technologies, Inc. 2 awardees, including Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top agencies DOE (Department of Energy)	$65,570,356	8.9%	Rank history: not on the FY2021 list, #4 in FY2022, #3 in FY2023 and #3 in FY2024; unchanged since FY2024.
4	Calca Solutions, LLC Top agencies DLA (Defense Logistics Agency)	$65,122,219	8.9%	Rank history: not on the FY2021 list, #8 in FY2022 and not on the FY2023–FY2024 lists; returned.
5	Airgas USA LLC 5 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Commerce (Department of Commerce)	$64,839,708	8.8%	Rank history: #76 in FY2021, not on the FY2022 list, #6 in FY2023 and #11 in FY2024; up 6 since FY2024.
6	L3Harris Technologies, Inc. Through Bwxt Ordnance Tennessee, Inc. Top agencies DOE (Department of Energy)	$46,800,000	6.4%	Rank history: not on the FY2021–FY2024 lists; new.
7	Messer North America Inc. 3 awardees, including Messer LLC, Linde Gas Espana, S.A. and Linde GMBH Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Treasury (Department of the Treasury)	$26,014,133	3.5%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2024; up 1 since FY2024.
8	Hudson Technologies Company Top agencies DLA (Defense Logistics Agency)	$14,015,819	1.9%	Rank history: not on the FY2021 list, #44 in FY2022, #47 in FY2023 and #58 in FY2024; up 50 since FY2024.
9	RAS Enterprises LLC Top agencies VA (Department of Veterans Affairs) DOE (Department of Energy) HHS (Department of Health and Human Services)	$13,593,435	1.9%	Rank history: #6 in FY2021, #9 in FY2022, #10 in FY2023 and #10 in FY2024; up 1 since FY2024.
10	Linde Public Limited Company 2 awardees, including Linde Engineering North America LLC and Linde Korea Co., Ltd Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency)	$13,131,497	1.8%	Rank history: not on the FY2021–FY2024 lists; up 107 since FY2024.
11	(Rc) 2 Pharma Connect L.L.C. Top agencies DLA (Defense Logistics Agency)	$8,424,625	1.1%	Rank history: not on the FY2021–FY2022 lists, #12 in FY2023 and #5 in FY2024; down 6 since FY2024.
12	RCG of North Carolina, LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DHA (Defense Health Agency)	$8,083,320	1.1%	Rank history: #23 in FY2021, #14 in FY2022, #13 in FY2023 and #12 in FY2024; unchanged since FY2024.
13	Ezekiel Bahar Top agencies Army (Department of the Army)	$6,286,579	0.9%	Rank history: not on the FY2021–FY2024 lists; up 383 since FY2024.
14	Linde Inc. Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Army (Department of the Army)	$6,144,250	0.8%	Rank history: #7 in FY2021, #7 in FY2022, #5 in FY2023 and #9 in FY2024; down 5 since FY2024.
15	Paula F Price Enterprises LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) HHS (Department of Health and Human Services)	$4,475,724	0.6%	Rank history: not on the FY2021 list, #13 in FY2022, #18 in FY2023 and #17 in FY2024; up 2 since FY2024.
16	Rgas LLC Top agencies DLA (Defense Logistics Agency)	$4,439,066	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
17	Nation Ford Chemical Co Top agencies Army (Department of the Army)	$4,353,830	0.6%	Rank history: #24 in FY2021, not on the FY2022 list, #16 in FY2023 and #59 in FY2024; up 42 since FY2024.
18	Monument Chemical Houston LLC Top agencies DLA (Defense Logistics Agency)	$4,219,330	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
19	Pacific Consolidated Industries LLC Top agencies USAF (Department of the Air Force)	$3,341,843	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
20	Mitsubishi Chemical Holdings Corporation 2 awardees, including Nippon Sanso Matheson, Inc. and Nippon Sanso Deutschland GMBH Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$3,330,086	0.5%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2023 and #13 in FY2024; down 7 since FY2024.
21	Lonza Walkersville Inc. Through Calca Solutions, LLC Top agencies DLA (Defense Logistics Agency)	$2,914,007	0.4%	Rank history: not on the FY2021–FY2023 lists and #4 in FY2024; down 17 since FY2024.
22	Matheson TRI-Gas Inc. 2 awardees, including Nippon Sanso Matheson, Inc. Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) NASA (National Aeronautics and Space Administration)	$2,897,681	0.4%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; up 14 since FY2024.
23	Linde Gas & Equipment Inc. Top agencies DLA (Defense Logistics Agency) HHS (Department of Health and Human Services) Army (Department of the Army)	$2,885,977	0.4%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2024; up 10 since FY2024.
24	Usalco, LLC Top agencies Army (Department of the Army)	$2,875,437	0.4%	Rank history: not on the FY2021–FY2023 lists and #38 in FY2024; up 14 since FY2024.
25	Specialized Materials and Chemicals, LLC Top agencies Army (Department of the Army)	$2,874,240	0.4%	Rank history: not on the FY2021–FY2022 lists, #11 in FY2023 and #6 in FY2024; down 19 since FY2024.
26	Roberts Oxygen Company Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$2,756,111	0.4%	Rank history: #25 in FY2021, #30 in FY2022, #29 in FY2023 and #22 in FY2024; down 4 since FY2024.
27	Global Gases Group FZE Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$2,512,121	0.3%	Rank history: #20 in FY2021, #17 in FY2022, #21 in FY2023 and #65 in FY2024; up 38 since FY2024.
28	Nidaz LLC Top agencies Army (Department of the Army)	$2,320,219	0.3%	Rank history: not on the FY2021–FY2024 lists; up 240 since FY2024.
29	Big Jet, LLC Top agencies Navy (Department of the Navy)	$2,217,443	0.3%	Rank history: not on the FY2021–FY2023 lists and #94 in FY2024; up 65 since FY2024.
30	Kuehne Chemical Company, Inc. Top agencies Army (Department of the Army)	$2,182,984	0.3%	Rank history: #14 in FY2021, #18 in FY2022, #26 in FY2023 and #20 in FY2024; down 10 since FY2024.
31	Green Lantern, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) Commerce (Department of Commerce)	$2,006,694	0.3%	Rank history: #17 in FY2021, #19 in FY2022, #30 in FY2023 and #29 in FY2024; down 2 since FY2024.
32	Novavera Corp Top agencies Army (Department of the Army)	$1,976,326	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
33	City Chemical LLC Top agencies Navy (Department of the Navy)	$1,714,359	0.2%	Rank history: #33 in FY2021, #35 in FY2022, #38 in FY2023 and #28 in FY2024; down 5 since FY2024.
34	Accumet Materials Co LLC Top agencies Army (Department of the Army)	$1,705,000	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
35	The Gas Company, LLC Top agencies Navy (Department of the Navy)	$1,420,547	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
36	Medical Equipment & Supplies of America LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$1,374,666	0.2%	Rank history: #41 in FY2021, #33 in FY2022, #48 in FY2023 and #42 in FY2024; up 6 since FY2024.
37	Inchcape Shipping Services Dubai LLC Top agencies DLA (Defense Logistics Agency)	$1,293,433	0.2%	Rank history: #18 in FY2021, #25 in FY2022, #40 in FY2023 and #30 in FY2024; down 7 since FY2024.
38	ROY Smith Company Top agencies Army (Department of the Army)	$1,253,007	0.2%	Rank history: #28 in FY2021, not on the FY2022 list, #24 in FY2023 and #40 in FY2024; up 2 since FY2024.
39	Silver Bluemoon LLC Top agencies NASA (National Aeronautics and Space Administration)	$1,232,000	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
40	Hawkins, Inc. 2 awardees, including Amerochem Corporation Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$1,213,583	0.2%	Rank history: not on the FY2021–FY2024 lists; up 237 since FY2024.
41	Amerochem Corporation Top agencies Navy (Department of the Navy)	$1,201,432	0.2%	Rank history: #26 in FY2021, #24 in FY2022, #28 in FY2023 and #23 in FY2024; down 18 since FY2024.
42	S. J. Smith Co. Inc. Through S.j. Smith Co., Inc. Top agencies Army (Department of the Army)	$1,166,855	0.2%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2024; up 2 since FY2024.
43	Marianas Gas Corp Top agencies DLA (Defense Logistics Agency) DHA (Defense Health Agency) Navy (Department of the Navy)	$1,121,361	0.2%	Rank history: #37 in FY2021, #45 in FY2022, #41 in FY2023 and #52 in FY2024; up 9 since FY2024.
44	Goodrich Gas Inc. Top agencies Army (Department of the Army)	$1,073,646	0.1%	Rank history: #29 in FY2021, #22 in FY2022, #33 in FY2023 and #43 in FY2024; down 1 since FY2024.
45	Ziegler Chemical & Mineral Corp Top agencies Army (Department of the Army)	$1,007,417	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
46	Sae Manufacturing Specialties Corp. Top agencies Army (Department of the Army)	$1,001,513	0.1%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2024; down 1 since FY2024.
47	Resintech Inc. Top agencies Navy (Department of the Navy)	$992,261	0.1%	Rank history: #22 in FY2021, #31 in FY2022, #27 in FY2023 and #39 in FY2024; down 8 since FY2024.
48	Mcgean-Rohco, Inc. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$981,247	0.1%	Rank history: not on the FY2021–FY2023 lists and #63 in FY2024; up 15 since FY2024.
49	Suffolk Solutions, Inc. Top agencies Army (Department of the Army)	$933,915	0.1%	Rank history: #27 in FY2021, #20 in FY2022 and not on the FY2023–FY2024 lists; up 91 since FY2024.
50	Coastal Energy, Inc. Top agencies USAF (Department of the Air Force)	$929,400	0.1%	Rank history: not on the FY2021 list, #55 in FY2022 and not on the FY2023–FY2024 lists; up 61 since FY2024.
51	Tangram Chemical LLC Top agencies Navy (Department of the Navy)	$821,922	0.1%	Rank history: #36 in FY2021, #28 in FY2022, #34 in FY2023 and #64 in FY2024; up 13 since FY2024.
52	Aurorium LLC Top agencies Navy (Department of the Navy)	$799,948	0.1%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2024; down 6 since FY2024.
53	Maryland Chemical Company, Inc. Top agencies Navy (Department of the Navy)	$788,735	0.1%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and #16 in FY2024; down 37 since FY2024.
54	Dynasty Chemical Corp Top agencies Army (Department of the Army)	$743,106	0.1%	Rank history: not on the FY2021–FY2023 lists and #72 in FY2024; up 18 since FY2024.
55	Showa Chemical Industry Co.,Ltd. Top agencies Navy (Department of the Navy)	$717,197	0.1%	Rank history: not on the FY2021 list, #67 in FY2022, #55 in FY2023 and #62 in FY2024; up 7 since FY2024.
56	Stripes Global, Inc. Top agencies VA (Department of Veterans Affairs)	$711,331	0.1%	Rank history: #51 in FY2021, not on the FY2022 list, #67 in FY2023 and #50 in FY2024; down 6 since FY2024.
57	808 Solutions Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USDA (Department of Agriculture)	$706,626	0.1%	Rank history: not on the FY2021 list, #69 in FY2022, #65 in FY2023 and not on the FY2024 list; up 46 since FY2024.
58	Island Pyrochemical Industries Corp Top agencies Army (Department of the Army) Navy (Department of the Navy)	$698,842	0.1%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023 and #49 in FY2024; down 9 since FY2024.
59	Carus LLC Top agencies Army (Department of the Army)	$691,937	0.1%	Rank history: #34 in FY2021, #34 in FY2022, #76 in FY2023 and #35 in FY2024; down 24 since FY2024.
60	Arxada LLC Top agencies Treasury (Department of the Treasury)	$675,814	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
61	High Valley Products, Inc. Top agencies USAF (Department of the Air Force)	$653,352	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
62	Strategic Consulting Alliances, LLC Top agencies Army (Department of the Army)	$642,374	0.1%	Rank history: #46 in FY2021, not on the FY2022 list, #52 in FY2023 and #41 in FY2024; down 21 since FY2024.
63	Integrated Procurement Technologies Top agencies Navy (Department of the Navy)	$636,387	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
64	Nexair LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$631,967	0.1%	Rank history: #47 in FY2021, #58 in FY2022, #61 in FY2023 and #47 in FY2024; down 17 since FY2024.
65	Condy Holdings LLC Through Carus LLC Top agencies Army (Department of the Army)	$559,267	0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023 and not on the FY2024 list; returned.
66	The Warwick Supply and Equipment Co., Inc. Top agencies VA (Department of Veterans Affairs)	$555,084	0.1%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023 and #71 in FY2024; up 5 since FY2024.
67	Gasochem International, Llc. Top agencies Army (Department of the Army) Commerce (Department of Commerce) USDA (Department of Agriculture)	$551,002	0.1%	Rank history: #61 in FY2021, not on the FY2022–FY2023 lists and #60 in FY2024; down 7 since FY2024.
68	Brenntag Pacific Inc Top agencies DOI (Department of the Interior) Treasury (Department of the Treasury)	$548,602	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
69	American Fast Freight Inc. Through Dubois Chemicals, Inc. Top agencies Army (Department of the Army)	$548,599	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
70	Shilog, Ltd Top agencies Army (Department of the Army)	$545,088	0.1%	Rank history: not on the FY2021–FY2022 lists, #42 in FY2023 and #24 in FY2024; down 46 since FY2024.
71	Hill Brothers Chemical Company Top agencies DOI (Department of the Interior)	$511,934	0.1%	Rank history: #65 in FY2021, #92 in FY2022, #64 in FY2023 and #99 in FY2024; up 28 since FY2024.
72	Daiichi Bussan Co., Ltd. Top agencies USAF (Department of the Air Force)	$510,233	0.1%	Rank history: #43 in FY2021 and not on the FY2022–FY2024 lists; returned.
73	GC3 Specialty Chemicals Inc. Top agencies Army (Department of the Army)	$507,194	0.1%	Rank history: #38 in FY2021, #41 in FY2022 and not on the FY2023–FY2024 lists; up 29 since FY2024.
74	Lis Technologies Inc. Top agencies DOE (Department of Energy)	$500,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
75	American Centrifuge Operating, LLC Top agencies DOE (Department of Energy)	$500,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	Louisiana Energy Services, LLC Top agencies DOE (Department of Energy)	$500,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
77	Global Laser Enrichment LLC Top agencies DOE (Department of Energy)	$500,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
78	Orano Federal Services LLC Top agencies DOE (Department of Energy)	$500,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
79	General Matter, Inc. Top agencies DOE (Department of Energy)	$500,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
80	PPD Development LP 2 awardees, including Life Technologies Corporation and Fisher Scientific Company L.L.C. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$481,634	0.1%	Rank history: not on the FY2021–FY2024 lists; up 56 since FY2024.
81	Christopher I. Oyolokor SR. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHA (Defense Health Agency)	$474,618	0.1%	Rank history: not on the FY2021 list, #48 in FY2022, #56 in FY2023 and #70 in FY2024; down 11 since FY2024.
82	KAP Technochem Usa, Inc. Top agencies Army (Department of the Army)	$474,459	0.1%	Rank history: #57 in FY2021, not on the FY2022 list, #44 in FY2023 and not on the FY2024 list; up 69 since FY2024.
83	Leonardo S.p.A. Through DRS Naval Power Systems Inc. Top agencies Navy (Department of the Navy)	$473,761	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
84	Linde Puerto Rico B.V. Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$472,429	0.1%	Rank history: not on the FY2021–FY2023 lists and #73 in FY2024; down 11 since FY2024.
85	Haun Welding Supply Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$469,620	0.1%	Rank history: #80 in FY2021, #75 in FY2022 and not on the FY2023–FY2024 lists; up 62 since FY2024.
86	Government Scientific Source Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$464,709	0.1%	Rank history: #42 in FY2021, #62 in FY2022, #43 in FY2023 and #66 in FY2024; down 20 since FY2024.
87	Suffolk Sales & Service Corp Top agencies Army (Department of the Army) DOI (Department of the Interior)	$464,489	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
88	Leland Limited Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$446,188	0.1%	Rank history: #87 in FY2021, #61 in FY2022, not on the FY2023 list and #19 in FY2024; down 69 since FY2024.
89	Innovative Federal Operations Group, Incorporated Top agencies Army (Department of the Army) DHA (Defense Health Agency) Navy (Department of the Navy)	$439,788	0.1%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and #74 in FY2024; down 15 since FY2024.
90	International Gas & Services Top agencies DLA (Defense Logistics Agency)	$424,920	0.1%	Rank history: #58 in FY2021, #60 in FY2022, #72 in FY2023 and #87 in FY2024; down 3 since FY2024.
91	Applied LNG Technologies LLC Top agencies DOI (Department of the Interior)	$421,669	0.1%	Rank history: not on the FY2021 list, #57 in FY2022, #54 in FY2023 and not on the FY2024 list; up 68 since FY2024.
92	Chuo Bussan Co.,Ltd. Top agencies USAF (Department of the Air Force)	$420,456	0.1%	Rank history: not on the FY2021–FY2024 lists; up 101 since FY2024.
93	Airgas Inc. 2 awardees, including Airgas Carbonic, Inc. and Air Liquide Italia Service S.R.L. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$416,931	0.1%	Rank history: #5 in FY2021, #6 in FY2022, #20 in FY2023 and #67 in FY2024; down 26 since FY2024.
94	Arc3 Gases, Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) DOJ (Department of Justice)	$409,707	0.1%	Rank history: #70 in FY2021, #77 in FY2022, #85 in FY2023 and #92 in FY2024; down 2 since FY2024.
95	Merrimac Petroleum, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$409,569	0.1%	Rank history: #39 in FY2021, #42 in FY2022, #51 in FY2023 and #54 in FY2024; down 41 since FY2024.
96	Seco Group, LLC Top agencies Navy (Department of the Navy) Treasury (Department of the Treasury)	$405,895	0.1%	Rank history: not on the FY2021–FY2024 lists; up 14 since FY2024.
97	Polydyne Inc. Top agencies Army (Department of the Army)	$404,800	0.1%	Rank history: not on the FY2021–FY2024 lists; up 87 since FY2024.
98	Chem-Trade International Inc. Top agencies Navy (Department of the Navy)	$396,900	0.1%	Rank history: not on the FY2021 list, #81 in FY2022 and not on the FY2023–FY2024 lists; returned.
99	Central Mcgowan Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$389,153	0.1%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2023 and not on the FY2024 list; up 5 since FY2024.
100	NCA Solutions, LLC Top agencies Army (Department of the Army)	$387,200	0.1%	Rank history: not on the FY2021 list, #47 in FY2022, not on the FY2023 list and #85 in FY2024; down 15 since FY2024.

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100 of 534 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	$335,317,522	Mid-America Conversion Services, LLC
32512 Industrial Gas Manufacturing	$317,296,939	Air Products and Chemicals, Inc.
32519 Other Basic Organic Chemical Manufacturing	$22,049,098	Monument Chemical Houston LLC
32511 Petrochemical Manufacturing	$461,902	A.m.s. Network, LLC

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $734 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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 FY2025?

1. Mid-America Conversion Services, LLC ($112M), 2. Air Products and Chemicals, Inc. ($107M), 3. BWX Technologies, Inc. ($65.6M), 4. Calca Solutions, LLC ($65.1M), 5. Airgas USA LLC ($64.8M), 6. L3Harris Technologies, Inc. ($46.8M), 7. Messer North America Inc. ($26M), 8. Hudson Technologies Company ($14M), 9. RAS Enterprises LLC ($13.6M), 10. Linde Public Limited Company ($13.1M).

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