Top 100 Contractors in NAICS 3251: Basic Chemical Manufacturing, Jul 2025–Jun 2026

Name: Top 100 Contractors in NAICS 3251: Basic Chemical Manufacturing, Jul 2025–Jun 2026
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 91% of NAICS 3251 contract dollars from July 2025 through June 2026

Contract obligations: $3,412,853,476 Net of deobligations, by contracts coded NAICS 3251 or a code under it
Contractors: 508 Parent companies with an obligation
Largest contractor: American Centrifuge Operating, LLC $900 million, 25.8% of obligations
Data as of: Oct 16, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	American Centrifuge Operating, LLC Top agencies DOE (Department of Energy)	$900,000,000	25.8%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; up 74 since Jul 2024–Jun 2025.
2	Orano Federal Services LLC Top agencies DOE (Department of Energy)	$900,000,000	25.8%	Rank history: not on the FY2021–FY2024 lists and #78 in FY2025; up 76 since Jul 2024–Jun 2025.
3	General Matter, Inc. Top agencies DOE (Department of Energy)	$900,000,000	25.8%	Rank history: not on the FY2021–FY2024 lists and #79 in FY2025; up 76 since Jul 2024–Jun 2025.
4	L3Harris Technologies, Inc. Through Bwxt Ordnance Tennessee, Inc. Top agencies DOE (Department of Energy)	$130,800,000	3.7%	Rank history: not on the FY2021–FY2024 lists and #6 in FY2025; new, not ranked in Jul 2024–Jun 2025.
5	Air Products and Chemicals, Inc. Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$95,022,692	2.7%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; down 3 since Jul 2024–Jun 2025.
6	BWX Technologies, Inc. 2 awardees, including Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top agencies DOE (Department of Energy)	$66,865,171	1.9%	Rank history: not on the FY2021 list, #4 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; down 3 since Jul 2024–Jun 2025.
7	Airgas USA LLC 4 awardees Top agencies DLA (Defense Logistics Agency) DHA (Defense Health Agency) Navy (Department of the Navy)	$64,314,265	1.8%	Rank history: #76 in FY2021, not on the FY2022 list, #6 in FY2023, #11 in FY2024 and #5 in FY2025; up 8 since Jul 2024–Jun 2025.
8	Calca Solutions, LLC Top agencies DLA (Defense Logistics Agency)	$62,647,382	1.8%	Rank history: not on the FY2021 list, #8 in FY2022, not on the FY2023–FY2024 lists and #4 in FY2025; up 4 since Jul 2024–Jun 2025.
9	Hudson Technologies Company Top agencies DLA (Defense Logistics Agency)	$31,629,616	0.9%	Rank history: not on the FY2021 list, #44 in FY2022, #47 in FY2023, #58 in FY2024 and #8 in FY2025; up 7 since Jul 2024–Jun 2025.
10	Rgas LLC Top agencies DLA (Defense Logistics Agency)	$29,496,576	0.8%	Rank history: not on the FY2021–FY2024 lists and #16 in FY2025; down 1 since Jul 2024–Jun 2025.
11	Linde Engineering North America LLC 3 awardees, including Linde Korea Co., Ltd and Linde GMBH Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency)	$24,678,869	0.7%	Rank history: not on the FY2021–FY2024 lists and #10 in FY2025; up 126 since Jul 2024–Jun 2025.
12	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)	$21,951,039	0.6%	Rank history: not on the FY2021–FY2023 lists, #8 in FY2024 and #7 in FY2025; down 8 since Jul 2024–Jun 2025.
13	Mid-America Conversion Services, LLC Top agencies DOE (Department of Energy)	$15,513,178	0.4%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2023, #2 in FY2024 and #1 in FY2025; down 12 since Jul 2024–Jun 2025.
14	RAS Enterprises LLC Top agencies VA (Department of Veterans Affairs) DOE (Department of Energy) HHS (Department of Health and Human Services)	$12,226,239	0.4%	Rank history: #6 in FY2021, #9 in FY2022, #10 in FY2023, #10 in FY2024 and #9 in FY2025; down 7 since Jul 2024–Jun 2025.
15	Cosmodyne, LLC Top agencies NASA (National Aeronautics and Space Administration)	$11,446,259	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
16	Specialized Materials and Chemicals, LLC Top agencies Army (Department of the Army)	$8,530,560	0.2%	Rank history: not on the FY2021–FY2022 lists, #11 in FY2023, #6 in FY2024 and #25 in FY2025; down 6 since Jul 2024–Jun 2025.
17	Linde Inc. 4 awardees, including Nippon Sanso Deutschland GMBH, Linde Advanced Material Technologies Inc. and Welsco, Inc. Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Army (Department of the Army)	$8,051,747	0.2%	Rank history: #7 in FY2021, #7 in FY2022, #5 in FY2023, #9 in FY2024 and #14 in FY2025; down 3 since Jul 2024–Jun 2025.
18	Monument Chemical Houston LLC Top agencies DLA (Defense Logistics Agency)	$7,050,350	0.2%	Rank history: not on the FY2021–FY2024 lists and #18 in FY2025; new, not ranked in Jul 2024–Jun 2025.
19	RCG of North Carolina, LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DHA (Defense Health Agency)	$6,735,262	0.2%	Rank history: #23 in FY2021, #14 in FY2022, #13 in FY2023, #12 in FY2024 and #12 in FY2025; down 8 since Jul 2024–Jun 2025.
20	Matheson TRI-Gas Inc. 3 awardees, including Nippon Sanso Matheson, Inc. Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) NASA (National Aeronautics and Space Administration)	$5,646,634	0.2%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2023, #13 in FY2024 and #20 in FY2025; up 1 since Jul 2024–Jun 2025.
21	Nation Ford Chemical Co Top agencies Army (Department of the Army)	$4,353,830	0.1%	Rank history: #24 in FY2021, not on the FY2022 list, #16 in FY2023, #59 in FY2024 and #17 in FY2025; new, not ranked in Jul 2024–Jun 2025.
22	Paula F Price Enterprises LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) HHS (Department of Health and Human Services)	$3,879,030	0.1%	Rank history: not on the FY2021 list, #13 in FY2022, #18 in FY2023, #17 in FY2024 and #15 in FY2025; down 4 since Jul 2024–Jun 2025.
23	Kuehne Chemical Company, Inc. Top agencies Army (Department of the Army)	$3,808,000	0.1%	Rank history: #14 in FY2021, #18 in FY2022, #26 in FY2023, #20 in FY2024 and #30 in FY2025; up 1 since Jul 2024–Jun 2025.
24	Pacific Consolidated Industries LLC Top agencies USAF (Department of the Air Force)	$3,341,843	0.1%	Rank history: not on the FY2021–FY2024 lists and #19 in FY2025; new, not ranked in Jul 2024–Jun 2025.
25	Tungco, Incorporated Top agencies DLA (Defense Logistics Agency)	$2,988,300	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
26	Usalco, LLC Top agencies Army (Department of the Army)	$2,956,802	0.1%	Rank history: not on the FY2021–FY2023 lists, #38 in FY2024 and #24 in FY2025; down 7 since Jul 2024–Jun 2025.
27	CF Industries Nitrogen LLC Top agencies DLA (Defense Logistics Agency)	$2,607,187	0.1%	Rank history: not on the FY2021–FY2023 lists, #32 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
28	Roberts Oxygen Company Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$2,364,468	0.1%	Rank history: #25 in FY2021, #30 in FY2022, #29 in FY2023, #22 in FY2024 and #26 in FY2025; down 2 since Jul 2024–Jun 2025.
29	Tangram Chemical LLC Top agencies Navy (Department of the Navy)	$2,325,040	0.1%	Rank history: #36 in FY2021, #28 in FY2022, #34 in FY2023, #64 in FY2024 and #51 in FY2025; up 24 since Jul 2024–Jun 2025.
30	Ezekiel Bahar Top agencies Army (Department of the Army)	$2,284,389	0.1%	Rank history: not on the FY2021–FY2024 lists and #13 in FY2025; down 17 since Jul 2024–Jun 2025.
31	Linde Gas & Equipment Inc. Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$2,183,404	0.1%	Rank history: not on the FY2021–FY2023 lists, #33 in FY2024 and #23 in FY2025; down 11 since Jul 2024–Jun 2025.
32	S.j. Smith Co., Inc. Top agencies Army (Department of the Army)	$2,133,483	0.1%	Rank history: not on the FY2021–FY2023 lists, #44 in FY2024 and #42 in FY2025; up 6 since Jul 2024–Jun 2025.
33	Novavera Corp Top agencies Army (Department of the Army)	$1,976,326	0.1%	Rank history: not on the FY2021–FY2024 lists and #32 in FY2025; new, not ranked in Jul 2024–Jun 2025.
34	Green Lantern, LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$1,824,639	0.1%	Rank history: #17 in FY2021, #19 in FY2022, #30 in FY2023, #29 in FY2024 and #31 in FY2025; down 6 since Jul 2024–Jun 2025.
35	Big Jet, LLC Top agencies Navy (Department of the Navy)	$1,692,710	<0.1%	Rank history: not on the FY2021–FY2023 lists, #94 in FY2024 and #29 in FY2025; down 2 since Jul 2024–Jun 2025.
36	City Chemical LLC Top agencies Navy (Department of the Navy)	$1,563,128	<0.1%	Rank history: #33 in FY2021, #35 in FY2022, #38 in FY2023, #28 in FY2024 and #33 in FY2025; down 5 since Jul 2024–Jun 2025.
37	The Gas Company, LLC Top agencies Navy (Department of the Navy) DHA (Defense Health Agency)	$1,428,473	<0.1%	Rank history: not on the FY2021–FY2024 lists and #35 in FY2025; up 14 since Jul 2024–Jun 2025.
38	Leland Limited Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,418,904	<0.1%	Rank history: #87 in FY2021, #61 in FY2022, not on the FY2023 list, #19 in FY2024 and #88 in FY2025; up 93 since Jul 2024–Jun 2025.
39	North American Refrigerants Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,399,036	<0.1%	Rank history: #48 in FY2021, not on the FY2022 list, #71 in FY2023, #34 in FY2024 and not on the FY2025 list; unchanged since Jul 2024–Jun 2025.
40	Suffolk Sales and Service Corporation Top agencies Army (Department of the Army)	$1,386,664	<0.1%	Rank history: not on the FY2021–FY2024 lists and #87 in FY2025; up 351 since Jul 2024–Jun 2025.
41	Suffolk Solutions, Inc. Top agencies Army (Department of the Army)	$1,375,120	<0.1%	Rank history: #27 in FY2021, #20 in FY2022, not on the FY2023–FY2024 lists and #49 in FY2025; down 4 since Jul 2024–Jun 2025.
42	Hawkins, Inc. 2 awardees, including Amerochem Corporation Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$1,254,532	<0.1%	Rank history: not on the FY2021–FY2024 lists and #40 in FY2025; up 5 since Jul 2024–Jun 2025.
43	Inchcape Shipping Services Dubai LLC Top agencies DLA (Defense Logistics Agency)	$1,221,781	<0.1%	Rank history: #18 in FY2021, #25 in FY2022, #40 in FY2023, #30 in FY2024 and #37 in FY2025; down 9 since Jul 2024–Jun 2025.
44	Chemble Solutions, LLC Top agencies Navy (Department of the Navy)	$1,205,389	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 106 since Jul 2024–Jun 2025.
45	Goodrich Gas Inc. Top agencies Army (Department of the Army)	$1,036,258	<0.1%	Rank history: #29 in FY2021, #22 in FY2022, #33 in FY2023, #43 in FY2024 and #44 in FY2025; down 4 since Jul 2024–Jun 2025.
46	Gasochem International, Llc. Top agencies Army (Department of the Army) Commerce (Department of Commerce) USDA (Department of Agriculture)	$968,824	<0.1%	Rank history: #61 in FY2021, not on the FY2022–FY2023 lists, #60 in FY2024 and #67 in FY2025; up 4 since Jul 2024–Jun 2025.
47	Marianas Gas Corp Top agencies DLA (Defense Logistics Agency) DHA (Defense Health Agency)	$959,761	<0.1%	Rank history: #37 in FY2021, #45 in FY2022, #41 in FY2023, #52 in FY2024 and #43 in FY2025; down 1 since Jul 2024–Jun 2025.
48	ROY Smith Company Top agencies Army (Department of the Army)	$949,600	<0.1%	Rank history: #28 in FY2021, not on the FY2022 list, #24 in FY2023, #40 in FY2024 and #38 in FY2025; unchanged since Jul 2024–Jun 2025.
49	Polyrheo USA Inc. Top agencies Navy (Department of the Navy)	$910,060	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
50	Nexair LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$891,931	<0.1%	Rank history: #47 in FY2021, #58 in FY2022, #61 in FY2023, #47 in FY2024 and #64 in FY2025; up 10 since Jul 2024–Jun 2025.
51	Island Pyrochemical Industries Corp Top agencies Army (Department of the Army)	$882,482	<0.1%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023, #49 in FY2024 and #58 in FY2025; up 29 since Jul 2024–Jun 2025.
52	808 Solutions Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DHA (Defense Health Agency)	$822,004	<0.1%	Rank history: not on the FY2021 list, #69 in FY2022, #65 in FY2023, not on the FY2024 list and #57 in FY2025; up 13 since Jul 2024–Jun 2025.
53	Maryland Chemical Company, Inc. Top agencies Navy (Department of the Navy)	$780,435	<0.1%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023, #16 in FY2024 and #53 in FY2025; down 9 since Jul 2024–Jun 2025.
54	Momar, Incorporated Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$743,050	<0.1%	Rank history: not on the FY2021 list, #54 in FY2022, #58 in FY2023, #53 in FY2024 and not on the FY2025 list; up 58 since Jul 2024–Jun 2025.
55	Dubois Chemicals Inc. Top agencies Army (Department of the Army)	$741,967	<0.1%	Rank history: not on the FY2021–FY2024 lists and #69 in FY2025; up 108 since Jul 2024–Jun 2025.
56	Phoenix V LLC Top agencies Army (Department of the Army)	$730,266	<0.1%	Rank history: #72 in FY2021, #70 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 91 since Jul 2024–Jun 2025.
57	Dynasty Chemical Corp Top agencies Army (Department of the Army)	$682,209	<0.1%	Rank history: not on the FY2021–FY2023 lists, #72 in FY2024 and #54 in FY2025; unchanged since Jul 2024–Jun 2025.
58	Oerlikon Metco US Inc. Top agencies USAF (Department of the Air Force)	$663,060	<0.1%	Rank history: not on the FY2021–FY2023 lists, #48 in FY2024 and not on the FY2025 list; up 26 since Jul 2024–Jun 2025.
59	Medical Equipment & Supplies of America LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$656,664	<0.1%	Rank history: #41 in FY2021, #33 in FY2022, #48 in FY2023, #42 in FY2024 and #36 in FY2025; down 23 since Jul 2024–Jun 2025.
60	Mcgean-Rohco, Inc. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$654,181	<0.1%	Rank history: not on the FY2021–FY2023 lists, #63 in FY2024 and #48 in FY2025; down 18 since Jul 2024–Jun 2025.
61	Scentry Biologicals, Inc. Top agencies USDA (Department of Agriculture)	$653,000	<0.1%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2023, #93 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
62	Chem-Trade International Inc. Top agencies Navy (Department of the Navy)	$597,900	<0.1%	Rank history: not on the FY2021 list, #81 in FY2022, not on the FY2023–FY2024 lists and #98 in FY2025; new, not ranked in Jul 2024–Jun 2025.
63	Condy Holdings LLC Through Carus LLC Top agencies Army (Department of the Army)	$595,508	<0.1%	Rank history: #34 in FY2021, #34 in FY2022, #76 in FY2023, #35 in FY2024 and #59 in FY2025; up 9 since Jul 2024–Jun 2025.
64	GC3 Specialty Chemicals Inc. Top agencies Army (Department of the Army)	$585,978	<0.1%	Rank history: #38 in FY2021, #41 in FY2022, not on the FY2023–FY2024 lists and #73 in FY2025; down 2 since Jul 2024–Jun 2025.
65	General Air Service & Supply Co. Top agencies Commerce (Department of Commerce) DOI (Department of the Interior) DHA (Defense Health Agency)	$576,108	<0.1%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and not on the FY2024–FY2025 lists; up 35 since Jul 2024–Jun 2025.
66	Coastal Energy, Inc. Top agencies USAF (Department of the Air Force)	$574,918	<0.1%	Rank history: not on the FY2021 list, #55 in FY2022, not on the FY2023–FY2024 lists and #50 in FY2025; down 17 since Jul 2024–Jun 2025.
67	The AES Corporation Top agencies Navy (Department of the Navy)	$551,693	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
68	Haun Welding Supply Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$532,084	<0.1%	Rank history: #80 in FY2021, #75 in FY2022, not on the FY2023–FY2024 lists and #85 in FY2025; up 92 since Jul 2024–Jun 2025.
69	Central Mcgowan Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$525,692	<0.1%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2023, not on the FY2024 list and #99 in FY2025; up 45 since Jul 2024–Jun 2025.
70	Linde Puerto Rico B.V. Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$519,695	<0.1%	Rank history: not on the FY2021–FY2023 lists, #73 in FY2024 and #84 in FY2025; down 2 since Jul 2024–Jun 2025.
71	Pacific Star Corporation Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$516,453	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 130 since Jul 2024–Jun 2025.
72	Merrimac Petroleum, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$500,228	<0.1%	Rank history: #39 in FY2021, #42 in FY2022, #51 in FY2023, #54 in FY2024 and #95 in FY2025; up 39 since Jul 2024–Jun 2025.
73	Brenntag Pacific Inc Top agencies DOI (Department of the Interior) Treasury (Department of the Treasury)	$477,406	<0.1%	Rank history: not on the FY2021–FY2024 lists and #68 in FY2025; down 6 since Jul 2024–Jun 2025.
74	The Warwick Supply and Equipment Co., Inc. Top agencies VA (Department of Veterans Affairs)	$475,790	<0.1%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023, #71 in FY2024 and #66 in FY2025; down 3 since Jul 2024–Jun 2025.
75	Innovative Federal Operations Group, Incorporated Top agencies Army (Department of the Army) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$463,742	<0.1%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023, #74 in FY2024 and #89 in FY2025; up 15 since Jul 2024–Jun 2025.
76	Sae Manufacturing Specialties Corp. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$448,336	<0.1%	Rank history: not on the FY2021–FY2023 lists, #45 in FY2024 and #46 in FY2025; down 18 since Jul 2024–Jun 2025.
77	Custom Gas Solutions LLC Top agencies Army (Department of the Army)	$447,250	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
78	Stripes Global, Inc. Top agencies VA (Department of Veterans Affairs)	$442,670	<0.1%	Rank history: #51 in FY2021, not on the FY2022 list, #67 in FY2023, #50 in FY2024 and #56 in FY2025; down 12 since Jul 2024–Jun 2025.
79	Arxada LLC Top agencies Treasury (Department of the Treasury)	$440,748	<0.1%	Rank history: not on the FY2021–FY2024 lists and #60 in FY2025; up 12 since Jul 2024–Jun 2025.
80	International Gas & Services Top agencies DLA (Defense Logistics Agency)	$434,853	<0.1%	Rank history: #58 in FY2021, #60 in FY2022, #72 in FY2023, #87 in FY2024 and #90 in FY2025; up 8 since Jul 2024–Jun 2025.
81	Ordnance Technology Service, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$432,316	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
82	Chuo Shoko Co., Ltd Top agencies Navy (Department of the Navy)	$430,057	<0.1%	Rank history: #54 in FY2021, #59 in FY2022, #75 in FY2023, #96 in FY2024 and not on the FY2025 list; up 22 since Jul 2024–Jun 2025.
83	Chuo Bussan Co.,Ltd. Top agencies USAF (Department of the Air Force)	$423,761	<0.1%	Rank history: not on the FY2021–FY2024 lists and #92 in FY2025; up 13 since Jul 2024–Jun 2025.
84	A.m.s. Network, LLC Top agencies DLA (Defense Logistics Agency)	$423,502	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 56 since Jul 2024–Jun 2025.
85	Madison Chemical Co Inc. Top agencies Treasury (Department of the Treasury)	$420,000	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
86	Xenturis LLC Top agencies DOL (Department of Labor) DOI (Department of the Interior)	$398,587	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
87	Expert Depot S.R.L. Top agencies Navy (Department of the Navy)	$380,470	<0.1%	Rank history: #49 in FY2021, #97 in FY2022, #87 in FY2023, #82 in FY2024 and not on the FY2025 list; up 32 since Jul 2024–Jun 2025.
88	Showa Chemical Industry Co.,Ltd. Top agencies Navy (Department of the Navy)	$380,039	<0.1%	Rank history: not on the FY2021 list, #67 in FY2022, #55 in FY2023, #62 in FY2024 and #55 in FY2025; down 36 since Jul 2024–Jun 2025.
89	Powder Alloy Corporation Top agencies USAF (Department of the Air Force)	$377,475	<0.1%	Rank history: #66 in FY2021, not on the FY2022 list, #74 in FY2023, #55 in FY2024 and not on the FY2025 list; up 13 since Jul 2024–Jun 2025.
90	Wosb Solutions, LLC Top agencies DLA (Defense Logistics Agency)	$371,836	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 207 since Jul 2024–Jun 2025.
91	KAP Technochem Usa, Inc. Top agencies Army (Department of the Army)	$370,949	<0.1%	Rank history: #57 in FY2021, not on the FY2022 list, #44 in FY2023, not on the FY2024 list and #82 in FY2025; down 8 since Jul 2024–Jun 2025.
92	Strategic Consulting Alliances, LLC Top agencies Army (Department of the Army)	$370,000	<0.1%	Rank history: #46 in FY2021, not on the FY2022 list, #52 in FY2023, #41 in FY2024 and #62 in FY2025; down 37 since Jul 2024–Jun 2025.
93	Metalcraft, Inc. Top agencies DLA (Defense Logistics Agency)	$368,586	<0.1%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023, #51 in FY2024 and not on the FY2025 list; down 37 since Jul 2024–Jun 2025.
94	Capitol Carbonic Corp Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$366,041	<0.1%	Rank history: #84 in FY2021, #99 in FY2022 and not on the FY2023–FY2025 lists; up 19 since Jul 2024–Jun 2025.
95	Hill Brothers Chemical Company Top agencies DOI (Department of the Interior)	$365,771	<0.1%	Rank history: #65 in FY2021, #92 in FY2022, #64 in FY2023, #99 in FY2024 and #71 in FY2025; up 2 since Jul 2024–Jun 2025.
96	Government Scientific Source Inc. Top agencies HHS (Department of Health and Human Services)	$358,921	<0.1%	Rank history: #42 in FY2021, #62 in FY2022, #43 in FY2023, #66 in FY2024 and #86 in FY2025; down 15 since Jul 2024–Jun 2025.
97	Seco Group, LLC Top agencies Navy (Department of the Navy) Treasury (Department of the Treasury)	$353,686	<0.1%	Rank history: not on the FY2021–FY2024 lists and #96 in FY2025; down 2 since Jul 2024–Jun 2025.
98	Applied LNG Technologies LLC Top agencies DOI (Department of the Interior)	$350,000	<0.1%	Rank history: not on the FY2021 list, #57 in FY2022, #54 in FY2023, not on the FY2024 list and #91 in FY2025; down 29 since Jul 2024–Jun 2025.
99	Okano, K.K. Top agencies DLA (Defense Logistics Agency)	$347,683	<0.1%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2023, #76 in FY2024 and not on the FY2025 list; unchanged since Jul 2024–Jun 2025.
100	Norco Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$344,998	<0.1%	Rank history: #74 in FY2021, not on the FY2022 list, #73 in FY2023, #83 in FY2024 and not on the FY2025 list; up 9 since Jul 2024–Jun 2025.

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100 of 508 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	$3,017,651,259	American Centrifuge Operating, LLC
32512 Industrial Gas Manufacturing	$369,704,142	Air Products and Chemicals, Inc.
32519 Other Basic Organic Chemical Manufacturing	$22,761,757	Monument Chemical Houston LLC
32511 Petrochemical Manufacturing	$759,249	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 $3.49 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 Jul 2025–Jun 2026?

1. American Centrifuge Operating, LLC ($900M), 2. Orano Federal Services LLC ($900M), 3. General Matter, Inc. ($900M), 4. L3Harris Technologies, Inc. ($131M), 5. Air Products and Chemicals, Inc. ($95M), 6. BWX Technologies, Inc. ($66.9M), 7. Airgas USA LLC ($64.3M), 8. Calca Solutions, LLC ($62.6M), 9. Hudson Technologies Company ($31.6M), 10. Rgas LLC ($29.5M).

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