Top 100 Contractors in PSC 44: Furnace/Steam/Drying; Nuclear Reactor, FY2021

Name: Top 100 Contractors in PSC 44: Furnace/Steam/Drying; Nuclear Reactor, FY2021
Creator: GovTribe

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

The top 10 won 98% of FY2021 PSC 44 contract dollars

Contract obligations: $3,606,338,683 Net of deobligations, by contracts coded PSC 44 or a code under it
Contractors: 521 Parent companies with an obligation
Largest contractor: Bechtel Corp $2 billion, 55.3% 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	Bechtel Corp Through Bechtel Plant Machinery, Inc. Top agencies Navy (Department of the Navy)	$2,000,472,737	55.3%	Rank history: #1 in FY2022, #2 in FY2023, #2 in FY2024 and #6 in FY2025; up 2 since FY2020.
2	Fluor Corporation Through Fluor Marine Propulsion, LLC Top agencies Navy (Department of the Navy)	$1,437,730,961	39.8%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
3	J Kokolakis Contracting Inc. Top agencies Army (Department of the Army)	$44,612,000	1.2%	Rank history: #11 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
4	Westinghouse Electric Company LLC Through Westinghouse Government Services LLC Top agencies DOE (Department of Energy)	$16,846,555	0.5%	Rank history: #4 in FY2022, #5 in FY2023, #9 in FY2024 and not on the FY2025 list; up 3 since FY2020.
5	General Dynamics Corporation Through Electric Boat Corporation Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$15,773,712	0.4%	Rank history: #3 in FY2022, #3 in FY2023, #4 in FY2024 and #3 in FY2025; up 1 since FY2020.
6	Huntington Ingalls Industries, Inc. Through Huntington Ingalls Inc. Top agencies Navy (Department of the Navy)	$9,935,777	0.3%	Rank history: #7 in FY2022, #6 in FY2023, #8 in FY2024 and #7 in FY2025; up 2 since FY2020.
7	RTX Corporation 4 awardees, including Hamilton Sundstrand Corporation, Raytheon Company and Rockwell Collins, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$5,611,714	0.2%	Rank history: #8 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
8	Xylem Inc. Through Fluid Handling LLC Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$3,258,305	0.1%	Rank history: #13 in FY2022, #44 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
9	Munters Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) USAF (Department of the Air Force)	$2,980,454	0.1%	Rank history: not on the FY2022 list, #73 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
10	O.C. Lugo Co. Inc. the Top agencies DLA (Defense Logistics Agency)	$2,848,689	0.1%	Rank history: #35 in FY2022, #8 in FY2023, #10 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
11	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,361,682	0.1%	Rank history: #30 in FY2022, not on the FY2023 list, #32 in FY2024 and #33 in FY2025; up 49 since FY2020.
12	Cepeda Associates, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$2,032,409	0.1%	Rank history: #6 in FY2022, #7 in FY2023, #7 in FY2024 and #9 in FY2025; down 3 since FY2020.
13	Aqua-Chem, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,957,608	0.1%	Rank history: #9 in FY2022, #13 in FY2023, #15 in FY2024 and #13 in FY2025; down 3 since FY2020.
14	Brighton Cromwell LLC Top agencies DLA (Defense Logistics Agency)	$1,901,988	0.1%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
15	Bollinger Shipyards Inc Through Chand, L.L.C. Top agencies DLA (Defense Logistics Agency)	$1,837,264	0.1%	Rank history: #50 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
16	Curtiss-Wright Corporation 2 awardees, including Peerless Instrument Co., Inc. and EST Group Inc. Top agencies Navy (Department of the Navy)	$1,714,349	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 94 since FY2020.
17	Bay Cast Technologies, Inc. Top agencies Army (Department of the Army)	$1,685,528	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Argo Turboserve Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,665,178	<0.1%	Rank history: #20 in FY2022, #12 in FY2023, #17 in FY2024 and #15 in FY2025; up 18 since FY2020.
19	Lancs Industries Operating LLC Top agencies Navy (Department of the Navy)	$1,652,007	<0.1%	Rank history: not on the FY2022–FY2023 lists, #82 in FY2024 and not on the FY2025 list; up 57 since FY2020.
20	Fad Pennsylvania Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,417,660	<0.1%	Rank history: #17 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
21	S I T Corporation Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,213,319	<0.1%	Rank history: #66 in FY2022, #20 in FY2023, #23 in FY2024 and #78 in FY2025; up 16 since FY2020.
22	Esco Technologies Inc. Through Vacco Industries Top agencies Navy (Department of the Navy)	$1,155,490	<0.1%	Rank history: not on the FY2022 list, #17 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
23	Kearny Steel Container Corp Top agencies Navy (Department of the Navy)	$1,119,300	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 38 since FY2020.
24	Howell Laboratories Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,048,622	<0.1%	Rank history: #32 in FY2022, #27 in FY2023, #57 in FY2024 and #20 in FY2025; up 10 since FY2020.
25	Midlands Mechanical, Inc. Top agencies Treasury (Department of the Treasury)	$1,040,423	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
26	Hunter Defense Technolog Through HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army)	$1,009,582	<0.1%	Rank history: #18 in FY2022, #25 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
27	HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army)	$998,569	<0.1%	Rank history: not on the FY2022–FY2023 lists, #30 in FY2024 and #31 in FY2025; down 6 since FY2020.
28	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$995,192	<0.1%	Rank history: #42 in FY2022, #28 in FY2023, #22 in FY2024 and #12 in FY2025; up 52 since FY2020.
29	Dibert Valve and Fitting Company, Incorporated 2 awardees Top agencies Navy (Department of the Navy)	$954,888	<0.1%	Rank history: #33 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
30	Rowan Technologies Inc. Through Consarc Corporation Top agencies DOE (Department of Energy)	$936,400	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$902,726	<0.1%	Rank history: #43 in FY2022, #21 in FY2023, #21 in FY2024 and #22 in FY2025; up 8 since FY2020.
32	Phoenix Systems Engineering Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) USAF (Department of the Air Force)	$766,527	<0.1%	Rank history: #87 in FY2022, #68 in FY2023, #37 in FY2024 and #37 in FY2025; down 10 since FY2020.
33	Xchanger Manufacturing Corporation Top agencies DLA (Defense Logistics Agency)	$711,420	<0.1%	Rank history: #49 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
34	Painter Tool Incorporated Top agencies Navy (Department of the Navy)	$704,548	<0.1%	Rank history: #37 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; up 55 since FY2020.
35	Drytech Inc. Top agencies DLA (Defense Logistics Agency)	$695,446	<0.1%	Rank history: #23 in FY2022, #42 in FY2023, #36 in FY2024 and #40 in FY2025; down 2 since FY2020.
36	Genuine Parts Company Through Motion Industries, Inc. Top agencies Navy (Department of the Navy)	$687,106	<0.1%	Rank history: #26 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; up 20 since FY2020.
37	Megabite Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$615,809	<0.1%	Rank history: not on the FY2022 list, #66 in FY2023 and not on the FY2024–FY2025 lists; down 17 since FY2020.
38	USA Mechanical & Controls LLC Top agencies USAF (Department of the Air Force)	$592,433	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency)	$589,550	<0.1%	Rank history: #61 in FY2022, #16 in FY2023, #26 in FY2024 and #29 in FY2025; new, not ranked in FY2020.
40	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$542,831	<0.1%	Rank history: #31 in FY2022, #60 in FY2023, #40 in FY2024 and #28 in FY2025; down 16 since FY2020.
41	Brimhall Industrial Inc. Top agencies DOI (Department of the Interior)	$506,161	<0.1%	Rank history: #55 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
42	Molecular Products Inc. Top agencies DLA (Defense Logistics Agency)	$497,508	<0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; down 14 since FY2020.
43	AQW Inc. Top agencies DLA (Defense Logistics Agency)	$477,742	<0.1%	Rank history: #45 in FY2022, #52 in FY2023, #58 in FY2024 and #46 in FY2025; down 5 since FY2020.
44	Integrated Procurement Technologies Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$462,439	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 42 since FY2020.
45	Thomas-Guy Limited Through Waltron Bull & Roberts, LLC Top agencies Navy (Department of the Navy)	$445,575	<0.1%	Rank history: #14 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
46	Thermal Product Solutions 2 awardees, including TPS LLC and Wisconsin Oven Corp Top agencies Army (Department of the Army) Navy (Department of the Navy) DOJ (Department of Justice)	$420,983	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	Patriot Mechanical, LLC Top agencies USAF (Department of the Air Force)	$415,170	<0.1%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
48	Dynamic Air Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$412,782	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 221 since FY2020.
49	Aantilia LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USDA (Department of Agriculture)	$389,493	<0.1%	Rank history: #57 in FY2022, not on the FY2023 list, #95 in FY2024 and not on the FY2025 list; up 265 since FY2020.
50	Export 220Volt Inc. Top agencies DOS (Department of State)	$386,760	<0.1%	Rank history: #15 in FY2022, #34 in FY2023, #20 in FY2024 and #32 in FY2025; down 35 since FY2020.
51	Aero Precision Industries LLC Through Allclear Aerospace & Defense, Inc. Top agencies Navy (Department of the Navy)	$376,950	<0.1%	Rank history: not on the FY2022–FY2023 lists, #87 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
52	Electric Heater Company the Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$375,404	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 159 since FY2020.
53	The Boeing Company 2 awardees, including Boeing Distribution Services, Inc. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$372,852	<0.1%	Rank history: not on the FY2022–FY2023 lists, #48 in FY2024 and not on the FY2025 list; up 361 since FY2020.
54	Refurbished Office Furniture, Inc. Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command)	$353,650	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 44 since FY2020.
55	JTM Enterprises LLC Top agencies DOI (Department of the Interior)	$352,132	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Western Michigan Fleet Parts Inc. Top agencies DLA (Defense Logistics Agency)	$344,035	<0.1%	Rank history: not on the FY2022 list, #22 in FY2023, #29 in FY2024 and not on the FY2025 list; up 2 since FY2020.
57	STS Operating, Inc. Top agencies Army (Department of the Army)	$319,200	<0.1%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
58	Unimex Corporation Through Paragon Defense Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$309,040	<0.1%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; up 152 since FY2020.
59	Lux Solutions LLC Top agencies Navy (Department of the Navy)	$300,939	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Johnson Controls Security Solutions LLC 3 awardees, including Johnson Controls Navy Systems, LLC, Johnson Controls, Inc. and Air Systems Components Inc. Top agencies DLA (Defense Logistics Agency) DOJ (Department of Justice) Navy (Department of the Navy)	$300,383	<0.1%	Rank history: #65 in FY2022, not on the FY2023 list, #89 in FY2024 and not on the FY2025 list; up 63 since FY2020.
61	Danaher Corporation Through Pall Aeropower Corporation Top agencies DLA (Defense Logistics Agency)	$282,571	<0.1%	Rank history: #47 in FY2022, #30 in FY2023, #75 in FY2024 and not on the FY2025 list; up 195 since FY2020.
62	Tomahawk Sourcing LLC Top agencies DLA (Defense Logistics Agency)	$281,800	<0.1%	Rank history: not on the FY2022–FY2024 lists and #43 in FY2025; new, not ranked in FY2020.
63	Hi-Tech Air & Water Purification Systems, LLC Top agencies USAF (Department of the Air Force)	$279,375	<0.1%	Rank history: not on the FY2022–FY2024 lists and #87 in FY2025; down 44 since FY2020.
64	Global Logistics Strategies Inc. Top agencies DLA (Defense Logistics Agency)	$278,306	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 231 since FY2020.
65	Wartsila Defense Inc. Through Defense Maritime Solutions, Inc. Top agencies Army (Department of the Army)	$272,639	<0.1%	Rank history: #68 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
66	Abatement Technologies, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$266,310	<0.1%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; up 89 since FY2020.
67	Douglas Food Stores Inc. Top agencies DOJ (Department of Justice) DHA (Defense Health Agency)	$262,057	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 256 since FY2020.
68	VSE Corporation 2 awardees, including Wheeler Fleet Solutions, Co. Top agencies DLA (Defense Logistics Agency)	$259,925	<0.1%	Rank history: not on the FY2022–FY2023 lists, #68 in FY2024 and not on the FY2025 list; down 4 since FY2020.
69	Bloomsburie LLC Top agencies Army (Department of the Army)	$249,386	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Dutch Valley Supply Co. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$244,596	<0.1%	Rank history: #76 in FY2022, #45 in FY2023, not on the FY2024 list and #93 in FY2025; up 24 since FY2020.
71	Lionheart Holdings LLC Through Selas Heat Technology Company LLC Top agencies DHS (Department of Homeland Security)	$244,337	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 38 since FY2020.
72	Aarcorp Through AAR Supply Chain, Inc. Top agencies DLA (Defense Logistics Agency)	$237,681	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 29 since FY2020.
73	Government of the United States 2 awardees, including Federal Prison Industries, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DHA (Defense Health Agency)	$234,006	<0.1%	Rank history: #52 in FY2022, #61 in FY2023, #42 in FY2024 and #36 in FY2025; up 68 since FY2020.
74	Adirondack Electronics Inc. Top agencies Navy (Department of the Navy)	$227,878	<0.1%	Rank history: #79 in FY2022, not on the FY2023 list, #92 in FY2024 and not on the FY2025 list; up 41 since FY2020.
75	Airgle Corporation Top agencies HHS (Department of Health and Human Services)	$226,975	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	General Nuclear Corp Top agencies Navy (Department of the Navy)	$221,910	<0.1%	Rank history: #89 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
77	G2I JBI LLC Top agencies USAF (Department of the Air Force)	$221,100	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Nasco Aerospace and Electronics LLC Top agencies Navy (Department of the Navy)	$219,423	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 41 since FY2020.
79	Boyd Corporation (Woburn) Inc. Top agencies DLA (Defense Logistics Agency)	$212,172	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Dentech, Inc. Top agencies Commerce (Department of Commerce)	$206,090	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	W.w. Grainger, Inc. Top agencies Army (Department of the Army) DOS (Department of State) DLA (Defense Logistics Agency)	$205,273	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 238 since FY2020.
82	Boone & Boone Sales Co., Inc. Top agencies Army (Department of the Army)	$203,160	<0.1%	Rank history: not on the FY2022 list, #75 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
83	Watts Water Technologies Inc Through Aerco International, Inc. Top agencies Navy (Department of the Navy)	$197,907	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 20 since FY2020.
84	Lynchburg Air Preheater Corporation Top agencies Army (Department of the Army)	$197,508	<0.1%	Rank history: #58 in FY2022, not on the FY2023 list, #25 in FY2024 and #55 in FY2025; down 59 since FY2020.
85	NGH Retail LLC Top agencies DLA (Defense Logistics Agency)	$191,442	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 51 since FY2020.
86	KAM Thermal Equipment, Ltd. Top agencies DHS (Department of Homeland Security)	$190,000	<0.1%	Rank history: not on the FY2022 list, #37 in FY2023, #80 in FY2024 and #91 in FY2025; new, not ranked in FY2020.
87	Hamilton's West, LLC Top agencies DOI (Department of the Interior)	$188,334	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Casco Manufacturing Solutions, Inc. Top agencies Navy (Department of the Navy)	$183,862	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Ritecon Inc. Top agencies DOI (Department of the Interior)	$177,973	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Fluidyne Corporation Top agencies Navy (Department of the Navy)	$177,173	<0.1%	Rank history: #75 in FY2022, not on the FY2023 list, #81 in FY2024 and not on the FY2025 list; up 90 since FY2020.
91	Marine Electric Systems Inc. Top agencies Navy (Department of the Navy)	$176,368	<0.1%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; down 17 since FY2020.
92	Yown's Boiler & Furnace Service, Llc. Top agencies DOJ (Department of Justice)	$172,763	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Martin Military Inc. Top agencies DLA (Defense Logistics Agency)	$170,608	<0.1%	Rank history: not on the FY2022 list, #77 in FY2023, #49 in FY2024 and not on the FY2025 list; up 3 since FY2020.
94	Federal Contracts LLC Top agencies Navy (Department of the Navy)	$169,489	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Flint Machine Tools, Inc. Top agencies Navy (Department of the Navy)	$168,400	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Portable Air Group LLC Top agencies VA (Department of Veterans Affairs)	$166,963	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 58 since FY2020.
97	Oshkosh Corp 2 awardees, including Oshkosh Defense LLC and JLG Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$165,080	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 264 since FY2020.
98	3075109 Canada Inc. Top agencies Navy (Department of the Navy)	$163,240	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	U.s.a. Spares Inc. Top agencies Navy (Department of the Navy)	$161,615	<0.1%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
100	Cavanaugh Government Group, LLC Top agencies DLA (Defense Logistics Agency)	$161,085	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 309 since FY2020.

Show 75 more

100 of 521 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC 44

Code	Net obligations	Largest contractor
4470 Nuclear Reactors	$3,491,250,532	Bechtel Corp
4430 Industrial Furnaces, Kilns, Lehrs, and Ovens	$47,255,853	J Kokolakis Contracting Inc.
4420 Heat Exchangers and Steam Condensers	$24,759,621	Xylem Inc.
4460 Air Purification Equipment	$22,930,122	RTX Corporation
4440 Driers, Dehydrators, and Anhydrators	$14,316,895	Munters Corporation
4410 Industrial Boilers	$5,825,660	Argo Turboserve Corporation

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 $3.62 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.
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 PSC 44 contractors in FY2021?

1. Bechtel Corp ($2B), 2. Fluor Corporation ($1.44B), 3. J Kokolakis Contracting Inc. ($44.6M), 4. Westinghouse Electric Company LLC ($16.8M), 5. General Dynamics Corporation ($15.8M), 6. Huntington Ingalls Industries, Inc. ($9.94M), 7. RTX Corporation ($5.61M), 8. Xylem Inc. ($3.26M), 9. Munters Corporation ($2.98M), 10. O.C. Lugo Co. Inc. the ($2.85M).

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