Top 48 Contractors in PSC 4470: Nuclear Reactors, Jul 2025–Jun 2026

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Fluor Corporation Through Fluor Marine Propulsion, LLC Top agencies Navy (Department of the Navy)	$1,416,849,240	88.1%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since Jul 2024–Jun 2025.
2	General Dynamics Corporation Through Electric Boat Corporation Top agencies Navy (Department of the Navy)	$32,586,044	2.0%	Rank history: #4 in FY2021, #3 in FY2022, #3 in FY2023, #4 in FY2024 and #3 in FY2025; up 1 since Jul 2024–Jun 2025.
3	Westinghouse Government Services LLC Top agencies DOE (Department of Energy)	$25,230,672	1.6%	Rank history: not on the FY2021–FY2023 lists, #9 in FY2024 and #4 in FY2025; up 1 since Jul 2024–Jun 2025.
4	Huntington Ingalls Industries, Inc. Through Huntington Ingalls Inc. Top agencies Navy (Department of the Navy)	$9,158,110	0.6%	Rank history: #5 in FY2021, #5 in FY2022, #6 in FY2023, #7 in FY2024 and #6 in FY2025; up 2 since Jul 2024–Jun 2025.
5	Bechtel Corp Through Bechtel Plant Machinery, Inc. Top agencies Navy (Department of the Navy)	$6,734,019	0.4%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2023, #2 in FY2024 and #5 in FY2025; up 2 since Jul 2024–Jun 2025.
6	Peerless Instrument Co., Inc. Top agencies Navy (Department of the Navy)	$1,920,413	0.1%	Rank history: #41 in FY2021, not on the FY2022–FY2023 lists, #10 in FY2024 and #11 in FY2025; up 5 since Jul 2024–Jun 2025.
7	American Centrifuge Operating, LLC Top agencies DOE (Department of Energy)	$1,556,985	0.1%	Rank history: not on the FY2021–FY2023 lists, #3 in FY2024 and #2 in FY2025; down 5 since Jul 2024–Jun 2025.
8	Waltron Bull & Roberts, LLC Top agencies Navy (Department of the Navy)	$1,448,145	0.1%	Rank history: not on the FY2021–FY2024 lists and #15 in FY2025; new, not ranked in Jul 2024–Jun 2025.
9	Frham Safety Products LLC Top agencies Navy (Department of the Navy)	$836,634	0.1%	Rank history: not on the FY2021 list, #31 in FY2022, #10 in FY2023, #12 in FY2024 and #7 in FY2025; down 1 since Jul 2024–Jun 2025.
10	Hyspan Precision Products, Inc. Top agencies Navy (Department of the Navy)	$394,812	<0.1%	Rank history: not on the FY2021 list, #15 in FY2022, not on the FY2023–FY2024 lists and #12 in FY2025; new, not ranked in Jul 2024–Jun 2025.
11	General Nuclear Corp Top agencies Navy (Department of the Navy)	$228,214	<0.1%	Rank history: not on the FY2021–FY2023 lists, #14 in FY2024 and #17 in FY2025; up 3 since Jul 2024–Jun 2025.
12	Diazyme Laboratories Inc. Through General Atomics Top agencies USUHS (DOD Uniformed Services University of the Health Sciences)	$209,380	<0.1%	Rank history: not on the FY2021–FY2024 lists and #14 in FY2025; new, not ranked in Jul 2024–Jun 2025.
13	Marine Electric Systems Inc. Top agencies Navy (Department of the Navy)	$192,969	<0.1%	Rank history: #18 in FY2021, #9 in FY2022, #22 in FY2023, #27 in FY2024 and #29 in FY2025; up 8 since Jul 2024–Jun 2025.
14	Lockheed Martin Corporation Top agencies Navy (Department of the Navy)	$183,043	<0.1%	Rank history: not on the FY2021 list, #30 in FY2022, not on the FY2023 list, #25 in FY2024 and #38 in FY2025; up 5 since Jul 2024–Jun 2025.
15	Corestar International Corporation Top agencies Navy (Department of the Navy)	$181,832	<0.1%	Rank history: #23 in FY2021, #29 in FY2022, not on the FY2023 list, #21 in FY2024 and #13 in FY2025; down 2 since Jul 2024–Jun 2025.
16	Dibert Valve and Fitting Company, Incorporated Top agencies Navy (Department of the Navy)	$168,231	<0.1%	Rank history: #10 in FY2021, #10 in FY2022, #11 in FY2023, #28 in FY2024 and #18 in FY2025; up 11 since Jul 2024–Jun 2025.
17	Fluidyne Corporation Top agencies Navy (Department of the Navy)	$161,193	<0.1%	Rank history: #17 in FY2021, #17 in FY2022, #28 in FY2023, #15 in FY2024 and #19 in FY2025; up 23 since Jul 2024–Jun 2025.
18	Adirondack Electronics Inc. Top agencies Navy (Department of the Navy)	$85,335	<0.1%	Rank history: #14 in FY2021, #19 in FY2022, #25 in FY2023, #17 in FY2024 and #25 in FY2025; unchanged since Jul 2024–Jun 2025.
19	In Speck Corp Top agencies Navy (Department of the Navy)	$83,977	<0.1%	Rank history: #20 in FY2021, #32 in FY2022, #23 in FY2023, #33 in FY2024 and #23 in FY2025; up 3 since Jul 2024–Jun 2025.
20	Rich Industries Inc. Top agencies Navy (Department of the Navy)	$79,158	<0.1%	Rank history: #25 in FY2021, #25 in FY2022, #19 in FY2023, #13 in FY2024 and #16 in FY2025; down 5 since Jul 2024–Jun 2025.
21	Norcatec LLC Top agencies Navy (Department of the Navy)	$70,826	<0.1%	Rank history: not on the FY2021–FY2022 lists, #17 in FY2023, #24 in FY2024 and #30 in FY2025; up 15 since Jul 2024–Jun 2025.
22	Draftco LLC Top agencies Navy (Department of the Navy)	$54,000	<0.1%	Rank history: not on the FY2021–FY2024 lists and #27 in FY2025; new, not ranked in Jul 2024–Jun 2025.
23	Nasco Aerospace and Electronics LLC Top agencies Navy (Department of the Navy)	$52,813	<0.1%	Rank history: #16 in FY2021, #27 in FY2022, #26 in FY2023, #19 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
24	Mirion Technologies (CAPINTEC) Inc. Through Mirion Technologies (Ist) Corporation Top agencies Navy (Department of the Navy)	$52,084	<0.1%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; new, not ranked in Jul 2024–Jun 2025.
25	Aiw-Alton Inc. Top agencies Navy (Department of the Navy)	$52,000	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
26	Creative Logistics Ltd Top agencies Navy (Department of the Navy)	$46,035	<0.1%	Rank history: not on the FY2021 list, #28 in FY2022, #43 in FY2023, not on the FY2024 list and #22 in FY2025; down 3 since Jul 2024–Jun 2025.
27	Painter Tool Incorporated Top agencies Navy (Department of the Navy)	$35,890	<0.1%	Rank history: #11 in FY2021, #11 in FY2022, #12 in FY2023, #20 in FY2024 and #24 in FY2025; down 3 since Jul 2024–Jun 2025.
28	MDF Technologies Inc. Top agencies Navy (Department of the Navy)	$35,400	<0.1%	Rank history: #38 in FY2021, not on the FY2022 list, #29 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
29	Greater Maryland Tool & Mfg. Corp. Top agencies Navy (Department of the Navy)	$34,725	<0.1%	Rank history: #34 in FY2021, #26 in FY2022, #16 in FY2023, #44 in FY2024 and #32 in FY2025; up 1 since Jul 2024–Jun 2025.
30	Indal Technologies Inc Through EST Group Inc. Top agencies Navy (Department of the Navy)	$34,482	<0.1%	Rank history: not on the FY2021–FY2023 lists, #38 in FY2024 and #36 in FY2025; up 4 since Jul 2024–Jun 2025.
31	S I T Corporation Top agencies Navy (Department of the Navy)	$30,500	<0.1%	Rank history: not on the FY2021–FY2023 lists, #30 in FY2024 and not on the FY2025 list; down 2 since Jul 2024–Jun 2025.
32	Skovira Machine Co Top agencies Navy (Department of the Navy)	$28,560	<0.1%	Rank history: #28 in FY2021, #20 in FY2022, #21 in FY2023, #23 in FY2024 and #10 in FY2025; down 22 since Jul 2024–Jun 2025.
33	BEC Systems LLC Top agencies Navy (Department of the Navy)	$27,753	<0.1%	Rank history: #37 in FY2021, #23 in FY2022, not on the FY2023–FY2024 lists and #33 in FY2025; new, not ranked in Jul 2024–Jun 2025.
34	Magnetic Instrumentation Company, LLC Top agencies Navy (Department of the Navy)	$25,325	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
35	Leonardo S.p.A. Through DRS Naval Power Systems Inc. Top agencies Navy (Department of the Navy)	$25,324	<0.1%	Rank history: #40 in FY2021, #35 in FY2022, not on the FY2023 list, #36 in FY2024 and #20 in FY2025; down 15 since Jul 2024–Jun 2025.
36	Gaffel Equipment Top agencies Navy (Department of the Navy)	$17,693	<0.1%	Rank history: #42 in FY2021, #38 in FY2022, #38 in FY2023, #35 in FY2024 and #42 in FY2025; down 5 since Jul 2024–Jun 2025.
37	Stoneage, Inc. Top agencies Navy (Department of the Navy)	$17,580	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
38	U.s.a. Spares Inc. Top agencies Navy (Department of the Navy)	$14,440	<0.1%	Rank history: #19 in FY2021, #22 in FY2022, #18 in FY2023, #26 in FY2024 and #21 in FY2025; down 21 since Jul 2024–Jun 2025.
39	Weckworth Manufacturing, Inc. Top agencies Navy (Department of the Navy)	$14,091	<0.1%	Rank history: #32 in FY2021, #47 in FY2022, not on the FY2023 list, #32 in FY2024 and #43 in FY2025; up 2 since Jul 2024–Jun 2025.
40	Fluid Conditioning Products, Inc. Top agencies Navy (Department of the Navy)	$11,502	<0.1%	Rank history: not on the FY2021 list, #48 in FY2022, not on the FY2023–FY2024 lists and #37 in FY2025; down 5 since Jul 2024–Jun 2025.
41	Alpha Engineered Composites LLC Top agencies Navy (Department of the Navy)	$7,182	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
42	Hansome Energy Systems Inc. Top agencies Navy (Department of the Navy)	$6,041	<0.1%	Rank history: not on the FY2021–FY2024 lists and #39 in FY2025; down 5 since Jul 2024–Jun 2025.
43	Daniels Manufacturing Corporation Top agencies Navy (Department of the Navy)	$1,925	<0.1%	Rank history: #45 in FY2021, #50 in FY2022, #31 in FY2023, #40 in FY2024 and #47 in FY2025; down 5 since Jul 2024–Jun 2025.
44	Basic Rubber and Plastics Co. Top agencies Navy (Department of the Navy)	$1,684	<0.1%	Rank history: #43 in FY2021, not on the FY2022–FY2023 lists, #43 in FY2024 and #48 in FY2025; new, not ranked in Jul 2024–Jun 2025.
45	Armil / Cfs, Inc. Top agencies Navy (Department of the Navy)	$1,410	<0.1%	Rank history: not on the FY2021–FY2024 lists and #35 in FY2025; down 12 since Jul 2024–Jun 2025.
46	A.M.S. Network LLC Top agencies Navy (Department of the Navy)	$938	<0.1%	Rank history: not on the FY2021–FY2023 lists, #37 in FY2024 and #31 in FY2025; down 18 since Jul 2024–Jun 2025.
47	Kampi Components Co Inc. Top agencies Navy (Department of the Navy)	$461	<0.1%	Rank history: #22 in FY2021, not on the FY2022 list, #27 in FY2023, #18 in FY2024 and #26 in FY2025; down 21 since Jul 2024–Jun 2025.
48	Era Industrial Sales Corp Top agencies DLA (Defense Logistics Agency)	$208	<0.1%	Rank history: #48 in FY2021, not on the FY2022–FY2024 lists and #50 in FY2025; new, not ranked in Jul 2024–Jun 2025.

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 $1.61 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.

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