Top 100 Contractors in NAICS 33639: Other Motor Vehicle Parts Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 33639: Other Motor Vehicle Parts Manufacturing, FY2021
Creator: GovTribe

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

The top 10 won 83% of FY2021 NAICS 33639 contract dollars

Contract obligations: $533,296,702 Net of deobligations, by contracts coded NAICS 33639 or a code under it
Contractors: 713 Parent companies with an obligation
Largest contractor: Rolls-Royce Military Aero Engines Ltd $388 million, 71.5% 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	Rolls-Royce Military Aero Engines Ltd Through Rolls-Royce Solutions America Inc. Top agencies Army (Department of the Army)	$387,998,496	71.5%	Rank history: not on the FY2022–FY2025 lists; up 25 since FY2020.
2	Oshkosh Corp 2 awardees, including Oshkosh Defense LLC and JLG Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$23,341,289	4.3%	Rank history: #1 in FY2022, #1 in FY2023, #7 in FY2024 and #6 in FY2025; down 1 since FY2020.
3	Honeywell International Inc. 2 awardees Top agencies Army (Department of the Army)	$6,875,400	1.3%	Rank history: #2 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; up 340 since FY2020.
4	Glemco LLC Top agencies Army (Department of the Army)	$6,133,060	1.1%	Rank history: #10 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
5	GTA Containers, Inc. Top agencies DLA (Defense Logistics Agency)	$5,605,109	1.0%	Rank history: #4 in FY2022, #3 in FY2023, #4 in FY2024 and #10 in FY2025; up 4 since FY2020.
6	Ibis TEK Inc. 2 awardees, including Xper, Inc. and Standard Bent Glass LLC Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$5,463,989	1.0%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
7	Penn Detroit Diesel Allison LLC Through Penn Power Group LLC Top agencies DLA (Defense Logistics Agency)	$3,858,740	0.7%	Rank history: #5 in FY2022, #5 in FY2023, #33 in FY2024 and not on the FY2025 list; up 13 since FY2020.
8	Brighton Cromwell LLC Top agencies DLA (Defense Logistics Agency)	$3,557,185	0.7%	Rank history: #35 in FY2022, not on the FY2023 list, #63 in FY2024 and #81 in FY2025; up 2 since FY2020.
9	Cavanaugh Government Group, LLC Top agencies DLA (Defense Logistics Agency)	$3,243,751	0.6%	Rank history: #12 in FY2022, #6 in FY2023, #15 in FY2024 and #40 in FY2025; down 5 since FY2020.
10	Ruta Supplies Inc. Top agencies DLA (Defense Logistics Agency)	$2,968,439	0.5%	Rank history: #6 in FY2022, #16 in FY2023, #12 in FY2024 and #16 in FY2025; down 7 since FY2020.
11	Autopartspros, LLC Top agencies Navy (Department of the Navy)	$2,661,469	0.5%	Rank history: #13 in FY2022, #9 in FY2023, #11 in FY2024 and #12 in FY2025; down 5 since FY2020.
12	Am General LLC 2 awardees Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$2,510,559	0.5%	Rank history: #3 in FY2022, not on the FY2023 list, #36 in FY2024 and #2 in FY2025; new, not ranked in FY2020.
13	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency)	$2,296,200	0.4%	Rank history: #21 in FY2022, #23 in FY2023, #21 in FY2024 and #13 in FY2025; down 2 since FY2020.
14	Underground Pipeline Inc. Top agencies DLA (Defense Logistics Agency)	$2,154,983	0.4%	Rank history: #70 in FY2022, not on the FY2023 list, #23 in FY2024 and not on the FY2025 list; up 57 since FY2020.
15	U.s. Hardware Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$1,837,480	0.3%	Rank history: #9 in FY2022, #2 in FY2023, #3 in FY2024 and #3 in FY2025; down 10 since FY2020.
16	Napa Sierra Top agencies Army (Department of the Army)	$1,790,333	0.3%	Rank history: #17 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
17	SAFRAN 3 awardees, including Safran Power USA LLC and Safran Electrical Components Canada Inc. Top agencies DLA (Defense Logistics Agency)	$1,710,989	0.3%	Rank history: not on the FY2022–FY2025 lists; up 63 since FY2020.
18	Longhorn Regional Service Center, LLC Top agencies DLA (Defense Logistics Agency)	$1,543,376	0.3%	Rank history: #16 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
19	Direct Line, Inc. Top agencies DLA (Defense Logistics Agency)	$1,532,293	0.3%	Rank history: #14 in FY2022, #12 in FY2023, #16 in FY2024 and #23 in FY2025; up 15 since FY2020.
20	Genuine Parts Company Top agencies Navy (Department of the Navy)	$1,508,164	0.3%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
21	QPI Pro, Inc. Top agencies DLA (Defense Logistics Agency)	$1,488,771	0.3%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; up 223 since FY2020.
22	ECI Defense Group, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,321,298	0.2%	Rank history: #23 in FY2022, #33 in FY2023, #86 in FY2024 and not on the FY2025 list; up 48 since FY2020.
23	Bpr-Rico Equipment, Inc. Top agencies DLA (Defense Logistics Agency)	$1,307,237	0.2%	Rank history: #27 in FY2022, #54 in FY2023, #34 in FY2024 and #82 in FY2025; down 5 since FY2020.
24	Training, Rehabilitation, & Development Institute, Inc. Top agencies Navy (Department of the Navy)	$1,260,270	0.2%	Rank history: #15 in FY2022, #22 in FY2023, #20 in FY2024 and #29 in FY2025; down 1 since FY2020.
25	Titan International, Inc. Through Titan Wheel Corporation of Illinois Top agencies Army (Department of the Army)	$1,256,160	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	Saint-Gobain Corporation (1) Through Luxium Solutions, LLC Top agencies DLA (Defense Logistics Agency)	$1,210,672	0.2%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; up 266 since FY2020.
27	Heico Aerospace Corporat 3 awardees, including Seal Dynamics LLC and Thermal Structures, Inc. Top agencies DLA (Defense Logistics Agency)	$1,108,025	0.2%	Rank history: #52 in FY2022, #53 in FY2023, #6 in FY2024 and #5 in FY2025; up 156 since FY2020.
28	BAE Systems PLC 2 awardees, including BAE Systems Land & Armaments L.P. Top agencies DLA (Defense Logistics Agency)	$1,084,453	0.2%	Rank history: #19 in FY2022, #21 in FY2023, #29 in FY2024 and #91 in FY2025; down 16 since FY2020.
29	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency)	$1,027,857	0.2%	Rank history: #8 in FY2022, #7 in FY2023, #5 in FY2024 and #4 in FY2025; up 13 since FY2020.
30	VSE Corporation 2 awardees, including Wheeler Fleet Solutions, Co. Top agencies DLA (Defense Logistics Agency)	$957,126	0.2%	Rank history: #87 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
31	Windward Enterprises, LLC Top agencies DLA (Defense Logistics Agency)	$950,602	0.2%	Rank history: #40 in FY2022, #44 in FY2023, #39 in FY2024 and #37 in FY2025; down 7 since FY2020.
32	Janels Industries Inc. Top agencies DLA (Defense Logistics Agency)	$860,419	0.2%	Rank history: #20 in FY2022, #19 in FY2023, #48 in FY2024 and #68 in FY2025; down 2 since FY2020.
33	Dynalec Corporation Top agencies DLA (Defense Logistics Agency)	$851,653	0.2%	Rank history: #7 in FY2022, #11 in FY2023, #24 in FY2024 and #36 in FY2025; up 75 since FY2020.
34	American Aluminum Accessories Inc. Top agencies DOJ (Department of Justice)	$841,748	0.2%	Rank history: #28 in FY2022, #17 in FY2023, #44 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
35	Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$819,531	0.2%	Rank history: #38 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
36	Schutt Industries of Clintonville, Wis., Inc. Top agencies DLA (Defense Logistics Agency)	$792,918	0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 276 since FY2020.
37	Beta Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$764,906	0.1%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; up 264 since FY2020.
38	Lanzen, Incorporated Top agencies DLA (Defense Logistics Agency)	$755,515	0.1%	Rank history: #97 in FY2022, #26 in FY2023, #61 in FY2024 and not on the FY2025 list; up 30 since FY2020.
39	General Dynamics Corporation 5 awardees, including General Dynamics Land Systems - Canada Corporation, General Dynamics Land Systems Inc. and General Dynamics Mission Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$737,857	0.1%	Rank history: #32 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; up 91 since FY2020.
40	Dion International Trucks, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$735,989	0.1%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
41	Tecmotiv Corporation Through Tecmotiv (Usa), Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$710,077	0.1%	Rank history: not on the FY2022 list, #48 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
42	Kinemecha Inc. Top agencies Army (Department of the Army)	$703,087	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Humanistic Robotics Inc. Top agencies Army (Department of the Army)	$698,211	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	Global Logistics Strategies Inc. Top agencies DLA (Defense Logistics Agency)	$684,530	0.1%	Rank history: #26 in FY2022, #39 in FY2023, #58 in FY2024 and #67 in FY2025; up 4 since FY2020.
45	Ronal Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$663,374	0.1%	Rank history: not on the FY2022 list, #41 in FY2023, not on the FY2024 list and #33 in FY2025; down 31 since FY2020.
46	LC Industries Inc. Top agencies Navy (Department of the Navy)	$653,423	0.1%	Rank history: #36 in FY2022, #30 in FY2023, #50 in FY2024 and not on the FY2025 list; up 3 since FY2020.
47	Bukkehave Corporation A / S Through Bukkehave, Inc. Top agencies Army (Department of the Army)	$624,573	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	Houston Drive Train Vehicle Component Sales, Inc. Top agencies DLA (Defense Logistics Agency)	$585,638	0.1%	Rank history: #30 in FY2022, #75 in FY2023, not on the FY2024 list and #76 in FY2025; up 6 since FY2020.
49	Choctaw Nation of Oklahoma Through Choctaw Defense Manufacturing LLC Top agencies DLA (Defense Logistics Agency)	$570,528	0.1%	Rank history: #96 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2020.
50	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$552,847	0.1%	Rank history: #56 in FY2022, #49 in FY2023, #75 in FY2024 and #60 in FY2025; down 4 since FY2020.
51	Endurance Defense, LLC Top agencies DLA (Defense Logistics Agency)	$522,403	0.1%	Rank history: not on the FY2022–FY2025 lists; up 77 since FY2020.
52	Statz Corp Top agencies DLA (Defense Logistics Agency)	$518,298	0.1%	Rank history: #51 in FY2022, #25 in FY2023, #17 in FY2024 and #41 in FY2025; down 27 since FY2020.
53	Dreamfind, Inc. Top agencies DLA (Defense Logistics Agency)	$518,295	0.1%	Rank history: not on the FY2022–FY2025 lists; up 73 since FY2020.
54	Noble Supply & Logistics, LLC Top agencies Navy (Department of the Navy)	$495,562	0.1%	Rank history: not on the FY2022–FY2025 lists; up 115 since FY2020.
55	Rev-Cap Company, Inc. Top agencies DLA (Defense Logistics Agency)	$490,671	0.1%	Rank history: #55 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; up 116 since FY2020.
56	Lynn Electronics LLC Top agencies DLA (Defense Logistics Agency)	$480,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
57	Hunter Defense Technolog Through HDT Expeditionary Systems Inc. Top agencies DLA (Defense Logistics Agency)	$444,964	0.1%	Rank history: #11 in FY2022, #20 in FY2023, #49 in FY2024 and not on the FY2025 list; down 17 since FY2020.
58	Patriot Armored Systems LLC Top agencies DLA (Defense Logistics Agency)	$443,027	0.1%	Rank history: #67 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
59	P55 Limited Top agencies DLA (Defense Logistics Agency)	$441,616	0.1%	Rank history: not on the FY2022 list, #58 in FY2023, #77 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
60	LOC Performance Products LLC Top agencies DLA (Defense Logistics Agency)	$439,709	0.1%	Rank history: not on the FY2022 list, #14 in FY2023, #22 in FY2024 and #20 in FY2025; down 22 since FY2020.
61	Southern Automotive Wholesalers, Inc. Top agencies DLA (Defense Logistics Agency)	$434,437	0.1%	Rank history: #24 in FY2022, #61 in FY2023, #67 in FY2024 and not on the FY2025 list; up 43 since FY2020.
62	Applied Industrial Technologies, Inc. Top agencies DLA (Defense Logistics Agency)	$432,601	0.1%	Rank history: not on the FY2022–FY2025 lists; up 248 since FY2020.
63	Greene Metal Products, Inc. Top agencies DLA (Defense Logistics Agency)	$428,842	0.1%	Rank history: #53 in FY2022, not on the FY2023 list, #69 in FY2024 and #73 in FY2025; up 22 since FY2020.
64	B.W.I. of KS. Inc. Top agencies DLA (Defense Logistics Agency)	$425,975	0.1%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
65	MSI Defense Solutions LLC Top agencies USSOCOM (United States Special Operations Command)	$420,613	0.1%	Rank history: not on the FY2022–FY2025 lists; up 76 since FY2020.
66	Coordinated Defense Supply Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$415,132	0.1%	Rank history: not on the FY2022 list, #63 in FY2023 and not on the FY2024–FY2025 lists; up 30 since FY2020.
67	Central Power Systems & Services, LLC Top agencies DLA (Defense Logistics Agency)	$414,121	0.1%	Rank history: #39 in FY2022, not on the FY2023 list, #71 in FY2024 and #21 in FY2025; up 82 since FY2020.
68	Impac Supply & Service Co. Ltd Top agencies Army (Department of the Army)	$412,139	0.1%	Rank history: not on the FY2022–FY2023 lists, #95 in FY2024 and #86 in FY2025; up 75 since FY2020.
69	John Johnson Company Top agencies DLA (Defense Logistics Agency)	$412,036	0.1%	Rank history: not on the FY2022–FY2025 lists; up 36 since FY2020.
70	Parts Life Inc. Through Deval Life Cycle Support LLC Top agencies DLA (Defense Logistics Agency)	$402,896	0.1%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
71	Aw Developments Exports Ltd Top agencies DLA (Defense Logistics Agency)	$392,898	0.1%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; up 23 since FY2020.
72	NGH Retail LLC Top agencies DLA (Defense Logistics Agency)	$390,473	0.1%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; down 16 since FY2020.
73	S I T Corporation Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$388,244	0.1%	Rank history: #74 in FY2022, #32 in FY2023, #76 in FY2024 and not on the FY2025 list; down 60 since FY2020.
74	MSC Industrial Direct Co., Inc. Top agencies DOJ (Department of Justice)	$375,096	0.1%	Rank history: #76 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; down 42 since FY2020.
75	Filtration Group Corporation Through Facet (Oklahoma) LLC Top agencies DLA (Defense Logistics Agency)	$373,112	0.1%	Rank history: #69 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; down 11 since FY2020.
76	Okinawa Bus K.K. Through Okinawa Fuso Jidosha Co.,Ltd. Top agencies Navy (Department of the Navy)	$367,074	0.1%	Rank history: not on the FY2022 list, #60 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2020.
77	Burhani Enterprises Inc. Top agencies DLA (Defense Logistics Agency)	$364,944	0.1%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
78	Great Lakes Sound & Vibration Inc. Top agencies DLA (Defense Logistics Agency)	$359,454	0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 285 since FY2020.
79	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$350,490	0.1%	Rank history: #94 in FY2022, #90 in FY2023, #87 in FY2024 and not on the FY2025 list; up 20 since FY2020.
80	Onodi Tool & Engineering Co Top agencies DLA (Defense Logistics Agency)	$344,581	0.1%	Rank history: #84 in FY2022, #64 in FY2023, #78 in FY2024 and #93 in FY2025; up 21 since FY2020.
81	Donaldson Company, Inc. Top agencies DLA (Defense Logistics Agency)	$326,757	0.1%	Rank history: not on the FY2022 list, #95 in FY2023, #51 in FY2024 and not on the FY2025 list; up 123 since FY2020.
82	The Boeing Company 2 awardees Top agencies Navy (Department of the Navy)	$312,584	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	C4 Welding, Inc. Top agencies Navy (Department of the Navy)	$311,241	0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
84	FBC Enterprises LLC Top agencies DLA (Defense Logistics Agency)	$300,400	0.1%	Rank history: #82 in FY2022, not on the FY2023 list, #8 in FY2024 and #8 in FY2025; up 194 since FY2020.
85	MCT Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$289,735	0.1%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; up 259 since FY2020.
86	Shigeru, KK Top agencies Navy (Department of the Navy)	$289,089	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Sunpower Corporation Through Hutchinson Industries, Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$286,766	0.1%	Rank history: #33 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; down 36 since FY2020.
88	Artex Truck Center Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$280,399	0.1%	Rank history: not on the FY2022 list, #92 in FY2023 and not on the FY2024–FY2025 lists; up 170 since FY2020.
89	Xper, Inc. Top agencies DLA (Defense Logistics Agency)	$278,214	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	OLB Associates LLC Top agencies DLA (Defense Logistics Agency)	$274,109	0.1%	Rank history: not on the FY2022–FY2025 lists; up 300 since FY2020.
91	EOS Inc. 2 awardees, including Sidecar Enterprises Inc. Top agencies DLA (Defense Logistics Agency)	$274,018	0.1%	Rank history: not on the FY2022–FY2025 lists; up 392 since FY2020.
92	G.s.e. Dynamics, Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$273,060	0.1%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
93	Auto Ha Thanh Joint Stock Company Top agencies WHS (DOD Washington Headquarters Service)	$272,760	0.1%	Rank history: not on the FY2022–FY2025 lists; up 149 since FY2020.
94	Worldwide Equipment Enterprises Inc. Through Worldwide Equipment Inc. Top agencies DLA (Defense Logistics Agency)	$256,781	<0.1%	Rank history: #58 in FY2022, #8 in FY2023, #19 in FY2024 and not on the FY2025 list; up 15 since FY2020.
95	International Filter Manufacturing Corp Top agencies DLA (Defense Logistics Agency)	$252,009	<0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; up 73 since FY2020.
96	Government of Canada Through Canadian Commercial Corporation Top agencies DLA (Defense Logistics Agency)	$251,029	<0.1%	Rank history: not on the FY2022 list, #29 in FY2023, #82 in FY2024 and not on the FY2025 list; down 46 since FY2020.
97	Eilers Machine & Welding Inc. Top agencies DLA (Defense Logistics Agency)	$250,887	<0.1%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; up 95 since FY2020.
98	Adams Thermal Systems Inc. Top agencies DLA (Defense Logistics Agency)	$250,764	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 334 since FY2020.
99	R & M Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$237,751	<0.1%	Rank history: not on the FY2022–FY2023 lists, #80 in FY2024 and #89 in FY2025; up 20 since FY2020.
100	Hyman Co., Ltd Top agencies Army (Department of the Army)	$237,065	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 91 since FY2020.

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100 of 713 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 33639

Code	Net obligations	Largest contractor
336390 Other Motor Vehicle Parts Manufacturing	$533,294,512	Rolls-Royce Military Aero Engines Ltd

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 $542 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 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 NAICS 33639 contractors in FY2021?

1. Rolls-Royce Military Aero Engines Ltd ($388M), 2. Oshkosh Corp ($23.3M), 3. Honeywell International Inc. ($6.88M), 4. Glemco LLC ($6.13M), 5. GTA Containers, Inc. ($5.61M), 6. Ibis TEK Inc. ($5.46M), 7. Penn Detroit Diesel Allison LLC ($3.86M), 8. Brighton Cromwell LLC ($3.56M), 9. Cavanaugh Government Group, LLC ($3.24M), 10. Ruta Supplies Inc. ($2.97M).

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