Top 100 Contractors in NAICS 332996: Fabricated Pipe and Pipe Fitting Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 332996: Fabricated Pipe and Pipe Fitting Manufacturing, FY2021
Creator: GovTribe

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

The top 10 won 30% of FY2021 NAICS 332996 contract dollars

Contract obligations: $42,125,413 Net of deobligations, by contracts coded NAICS 332996
Contractors: 874 Parent companies with an obligation
Largest contractor: Transdigm Group Incorporated $6.38 million, 7.5% 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	Transdigm Group Incorporated 7 awardees, including Aerocontrolex Group, Inc., Transdigm Inc. and Tactair Fluid Controls Inc. Top agencies DLA (Defense Logistics Agency)	$6,382,321	7.5%	Rank history: #20 in FY2022, #5 in FY2023, #71 in FY2024 and not on the FY2025 list; up 10 since FY2020.
2	Federal Resources Supply Company 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$5,075,412	6.0%	Rank history: #2 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
3	Aarcorp Through AAR Supply Chain, Inc. Top agencies DLA (Defense Logistics Agency)	$3,960,380	4.7%	Rank history: #3 in FY2022, #75 in FY2023, #13 in FY2024 and not on the FY2025 list; unchanged since FY2020.
4	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency)	$2,256,234	2.6%	Rank history: #6 in FY2022, #19 in FY2023, #5 in FY2024 and #6 in FY2025; up 10 since FY2020.
5	Eaton-Aeroquip Inc. Top agencies DLA (Defense Logistics Agency)	$1,727,035	2.0%	Rank history: not on the FY2022–FY2025 lists; up 50 since FY2020.
6	ITL LLC Top agencies DLA (Defense Logistics Agency)	$1,294,123	1.5%	Rank history: #8 in FY2022, #7 in FY2023, #3 in FY2024 and #2 in FY2025; up 28 since FY2020.
7	Indiana Fluid Systems Solutions LLC Top agencies Navy (Department of the Navy)	$1,213,897	1.4%	Rank history: not on the FY2022–FY2025 lists; up 25 since FY2020.
8	Aero-Dyne Supply Co., Inc. Top agencies DLA (Defense Logistics Agency)	$1,182,208	1.4%	Rank history: #15 in FY2022, #9 in FY2023, #8 in FY2024 and #11 in FY2025; up 5 since FY2020.
9	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency)	$1,135,179	1.3%	Rank history: #9 in FY2022, #10 in FY2023, #18 in FY2024 and #21 in FY2025; down 3 since FY2020.
10	Eaton Corporation 4 awardees, including Eaton Aeroquip LLC and Danfoss Power Solutions II, LLC Top agencies DLA (Defense Logistics Agency)	$1,081,520	1.3%	Rank history: #4 in FY2022, #1 in FY2023, #1 in FY2024 and #3 in FY2025; down 8 since FY2020.
11	B. & E. Manufacturing Co., Inc. Top agencies DLA (Defense Logistics Agency)	$946,540	1.1%	Rank history: #17 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
12	Mid-State Aerospace Inc. Top agencies DLA (Defense Logistics Agency)	$930,591	1.1%	Rank history: #18 in FY2022, #11 in FY2023, #21 in FY2024 and #9 in FY2025; down 4 since FY2020.
13	ASC International, Inc. Top agencies DLA (Defense Logistics Agency)	$878,152	1.0%	Rank history: #40 in FY2022, #94 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
14	Arapaho Pipe & Supply LP Top agencies DOE (Department of Energy) DLA (Defense Logistics Agency)	$840,348	1.0%	Rank history: not on the FY2022–FY2025 lists; up 100 since FY2020.
15	Double Rocker Holdings Inc. 2 awardees, including Womack Machine Supply Co of Houston, LLC and Womack Machine Supply Co., LLC Top agencies DLA (Defense Logistics Agency)	$688,188	0.8%	Rank history: #14 in FY2022, #48 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
16	Highland Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$658,318	0.8%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; up 312 since FY2020.
17	Bollinger Shipyards Inc Through Chand, L.L.C. Top agencies DLA (Defense Logistics Agency)	$657,635	0.8%	Rank history: #16 in FY2022, #49 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
18	S3 International LLC Through S3 Aerodefense LLC Top agencies DLA (Defense Logistics Agency)	$637,301	0.7%	Rank history: #50 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; up 108 since FY2020.
19	BEC Systems LLC Top agencies DLA (Defense Logistics Agency)	$618,732	0.7%	Rank history: #13 in FY2022, #33 in FY2023, #25 in FY2024 and #15 in FY2025; down 7 since FY2020.
20	Stanley Black & Decker, Inc. Through E.a. Patten Co LLC Top agencies DLA (Defense Logistics Agency)	$579,912	0.7%	Rank history: #10 in FY2022, #27 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
21	Oil States Industries Inc Top agencies DLA (Defense Logistics Agency)	$563,659	0.7%	Rank history: not on the FY2022 list, #25 in FY2023 and not on the FY2024–FY2025 lists; up 60 since FY2020.
22	Tate Andale, LLC Top agencies DLA (Defense Logistics Agency)	$528,814	0.6%	Rank history: #23 in FY2022, #15 in FY2023, #35 in FY2024 and #26 in FY2025; up 17 since FY2020.
23	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$528,782	0.6%	Rank history: #66 in FY2022, #43 in FY2023, #27 in FY2024 and #77 in FY2025; up 48 since FY2020.
24	Statz Corp Top agencies DLA (Defense Logistics Agency)	$514,932	0.6%	Rank history: #36 in FY2022, #41 in FY2023, #23 in FY2024 and #29 in FY2025; up 12 since FY2020.
25	S I T Corporation Top agencies DLA (Defense Logistics Agency)	$511,634	0.6%	Rank history: not on the FY2022–FY2023 lists, #49 in FY2024 and #55 in FY2025; up 34 since FY2020.
26	Jamaica Bearings Co., Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$495,725	0.6%	Rank history: #24 in FY2022, #16 in FY2023, #41 in FY2024 and #8 in FY2025; down 11 since FY2020.
27	Dela Technology Corporation Top agencies DLA (Defense Logistics Agency)	$475,782	0.6%	Rank history: #48 in FY2022, #59 in FY2023, not on the FY2024 list and #78 in FY2025; up 10 since FY2020.
28	Advanced Products Services Inc. Top agencies DLA (Defense Logistics Agency)	$458,716	0.5%	Rank history: #34 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
29	Aerocontrolex Group, Inc. Top agencies DLA (Defense Logistics Agency)	$457,520	0.5%	Rank history: not on the FY2022–FY2025 lists; up 242 since FY2020.
30	T and T Products LLC Top agencies DLA (Defense Logistics Agency)	$434,509	0.5%	Rank history: #21 in FY2022, #24 in FY2023, #17 in FY2024 and #12 in FY2025; unchanged since FY2020.
31	Buchanans Tube Bending Company Inc. Top agencies DLA (Defense Logistics Agency)	$428,752	0.5%	Rank history: #57 in FY2022, #54 in FY2023, #65 in FY2024 and #25 in FY2025; up 17 since FY2020.
32	Stealth Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$416,617	0.5%	Rank history: not on the FY2022–FY2023 lists, #31 in FY2024 and #41 in FY2025; up 33 since FY2020.
33	Ruta Supplies Inc. Top agencies DLA (Defense Logistics Agency)	$412,977	0.5%	Rank history: #33 in FY2022, #34 in FY2023, #52 in FY2024 and #74 in FY2025; up 10 since FY2020.
34	Custom Hydraulic & Machine, Inc. Top agencies DLA (Defense Logistics Agency)	$393,706	0.5%	Rank history: #42 in FY2022, #31 in FY2023, #26 in FY2024 and #19 in FY2025; up 32 since FY2020.
35	Zemarc Corporation Top agencies DLA (Defense Logistics Agency)	$387,990	0.5%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; up 260 since FY2020.
36	Jag Components, LLC Top agencies DLA (Defense Logistics Agency)	$384,475	0.5%	Rank history: not on the FY2022–FY2023 lists, #43 in FY2024 and #47 in FY2025; up 401 since FY2020.
37	Aero Precision Industries LLC Through Allclear Aerospace & Defense, Inc. Top agencies DLA (Defense Logistics Agency)	$384,240	0.5%	Rank history: #86 in FY2022, #78 in FY2023 and not on the FY2024–FY2025 lists; up 360 since FY2020.
38	Hydraulics International, Inc. Top agencies DLA (Defense Logistics Agency)	$383,883	0.5%	Rank history: #62 in FY2022, #100 in FY2023, #55 in FY2024 and #32 in FY2025; up 14 since FY2020.
39	Neptune Research Inc. Top agencies DLA (Defense Logistics Agency)	$382,964	0.4%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
40	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$371,605	0.4%	Rank history: #39 in FY2022, #51 in FY2023, #63 in FY2024 and #75 in FY2025; unchanged since FY2020.
41	Transaero, Inc. Top agencies DLA (Defense Logistics Agency)	$371,425	0.4%	Rank history: not on the FY2022 list, #97 in FY2023, not on the FY2024 list and #49 in FY2025; up 132 since FY2020.
42	The Boeing Company 4 awardees, including Boeing Distribution Services, Inc., Boeing Distribution, Inc. and Boeing Distribution Services X, Inc. Top agencies DLA (Defense Logistics Agency)	$363,992	0.4%	Rank history: #38 in FY2022, #21 in FY2023, #14 in FY2024 and #22 in FY2025; down 24 since FY2020.
43	Tecmotiv Corporation Through Tecmotiv (Usa), Inc. Top agencies DLA (Defense Logistics Agency)	$363,452	0.4%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
44	Janels Industries Inc. Top agencies DLA (Defense Logistics Agency)	$354,685	0.4%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; down 39 since FY2020.
45	Argo Turboserve Corporation 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$347,807	0.4%	Rank history: #46 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 82 since FY2020.
46	Integrated Procurement Technologies Top agencies DLA (Defense Logistics Agency)	$343,131	0.4%	Rank history: not on the FY2022–FY2025 lists; up 40 since FY2020.
47	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$341,113	0.4%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; up 3 since FY2020.
48	Lokring Mid-Atlantic, Inc. Top agencies DLA (Defense Logistics Agency)	$335,592	0.4%	Rank history: #32 in FY2022, #39 in FY2023, #34 in FY2024 and #69 in FY2025; down 13 since FY2020.
49	PCX Inc. Top agencies DLA (Defense Logistics Agency)	$335,209	0.4%	Rank history: #41 in FY2022, not on the FY2023 list, #80 in FY2024 and #24 in FY2025; down 8 since FY2020.
50	L.a. Martin Company Top agencies DLA (Defense Logistics Agency)	$330,666	0.4%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
51	Brighton Cromwell LLC Top agencies DLA (Defense Logistics Agency)	$330,481	0.4%	Rank history: not on the FY2022–FY2025 lists; down 31 since FY2020.
52	General Tool Company Top agencies DLA (Defense Logistics Agency)	$325,745	0.4%	Rank history: not on the FY2022–FY2023 lists, #54 in FY2024 and not on the FY2025 list; up 151 since FY2020.
53	R & M Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$314,100	0.4%	Rank history: not on the FY2022–FY2025 lists; down 22 since FY2020.
54	SAFRAN 2 awardees, including Safran Electrical Components Canada Inc. and Air Cruisers Company, LLC Top agencies DLA (Defense Logistics Agency)	$312,876	0.4%	Rank history: #47 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; up 180 since FY2020.
55	U.s.a. Spares Inc. Top agencies DLA (Defense Logistics Agency)	$275,815	0.3%	Rank history: not on the FY2022–FY2023 lists, #85 in FY2024 and #46 in FY2025; up 197 since FY2020.
56	Trend Tool, Inc. Top agencies DLA (Defense Logistics Agency)	$269,980	0.3%	Rank history: #90 in FY2022, #62 in FY2023, #77 in FY2024 and not on the FY2025 list; up 73 since FY2020.
57	Magna James Ltd. Top agencies DLA (Defense Logistics Agency)	$266,152	0.3%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
58	American Metal Fabrication Inc. Top agencies DLA (Defense Logistics Agency)	$263,346	0.3%	Rank history: #56 in FY2022, not on the FY2023 list, #91 in FY2024 and #76 in FY2025; up 9 since FY2020.
59	A.m.s. Network, LLC 2 awardees Top agencies DLA (Defense Logistics Agency)	$261,696	0.3%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; up 179 since FY2020.
60	Tomco Machining, Inc. Top agencies DLA (Defense Logistics Agency)	$258,602	0.3%	Rank history: #37 in FY2022, not on the FY2023 list, #69 in FY2024 and #90 in FY2025; up 32 since FY2020.
61	Essex Industries Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$257,872	0.3%	Rank history: #28 in FY2022, #55 in FY2023, #29 in FY2024 and #85 in FY2025; up 35 since FY2020.
62	All Metal Sales, Inc. Top agencies USAF (Department of the Air Force)	$247,713	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Dutch Valley Supply Co. Top agencies DLA (Defense Logistics Agency)	$247,256	0.3%	Rank history: not on the FY2022–FY2023 lists, #37 in FY2024 and #48 in FY2025; up 22 since FY2020.
64	Midway Industrial Supply Inc. Top agencies DLA (Defense Logistics Agency)	$245,901	0.3%	Rank history: #29 in FY2022, #69 in FY2023, #42 in FY2024 and #45 in FY2025; down 20 since FY2020.
65	Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$245,299	0.3%	Rank history: #22 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; down 20 since FY2020.
66	Staver Hydraulics Co., Inc. Top agencies DLA (Defense Logistics Agency)	$243,594	0.3%	Rank history: #61 in FY2022, not on the FY2023 list, #78 in FY2024 and not on the FY2025 list; down 28 since FY2020.
67	AAR Supply Chain, Inc. Top agencies DLA (Defense Logistics Agency)	$243,099	0.3%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
68	Burke Products Inc. Top agencies DLA (Defense Logistics Agency)	$231,977	0.3%	Rank history: #49 in FY2022, #40 in FY2023, #72 in FY2024 and #71 in FY2025; up 233 since FY2020.
69	Ross Development Inc. Top agencies DLA (Defense Logistics Agency)	$230,201	0.3%	Rank history: not on the FY2022–FY2025 lists; up 194 since FY2020.
70	Harris Support Services LLC Top agencies DLA (Defense Logistics Agency)	$227,313	0.3%	Rank history: not on the FY2022–FY2025 lists; up 213 since FY2020.
71	Bison Pipe & Supply LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$223,290	0.3%	Rank history: not on the FY2022–FY2025 lists; up 201 since FY2020.
72	Kendall Holdings Ltd. Top agencies NASA (National Aeronautics and Space Administration)	$221,527	0.3%	Rank history: not on the FY2022 list, #81 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
73	Lkr, Inc. Top agencies DLA (Defense Logistics Agency)	$221,421	0.3%	Rank history: #53 in FY2022, #44 in FY2023, #38 in FY2024 and #57 in FY2025; up 7 since FY2020.
74	Don Industrial Group LLC Top agencies DLA (Defense Logistics Agency)	$221,211	0.3%	Rank history: not on the FY2022 list, #14 in FY2023 and not on the FY2024–FY2025 lists; up 47 since FY2020.
75	Derbyshire Machine & Tool Co Top agencies DLA (Defense Logistics Agency)	$220,109	0.3%	Rank history: #7 in FY2022, #17 in FY2023, #46 in FY2024 and #31 in FY2025; down 46 since FY2020.
76	One-Way Manufacturing Inc. Top agencies DLA (Defense Logistics Agency)	$220,107	0.3%	Rank history: #67 in FY2022, not on the FY2023 list, #39 in FY2024 and #100 in FY2025; up 149 since FY2020.
77	Bb&G Enterprises Inc. Top agencies DLA (Defense Logistics Agency)	$219,785	0.3%	Rank history: #59 in FY2022, #35 in FY2023, #97 in FY2024 and #88 in FY2025; up 16 since FY2020.
78	Greene Machine & Manufacturing Inc. Top agencies DLA (Defense Logistics Agency)	$217,025	0.3%	Rank history: #95 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; down 54 since FY2020.
79	Fluidyne Corporation Top agencies DLA (Defense Logistics Agency)	$210,411	0.2%	Rank history: not on the FY2022–FY2025 lists; up 28 since FY2020.
80	Hydro-Fitting Manufacturing Corporation Top agencies DLA (Defense Logistics Agency)	$209,627	0.2%	Rank history: #69 in FY2022, #28 in FY2023, #22 in FY2024 and #20 in FY2025; down 58 since FY2020.
81	Martin Military Inc. Top agencies DLA (Defense Logistics Agency)	$209,318	0.2%	Rank history: not on the FY2022 list, #67 in FY2023, #53 in FY2024 and #63 in FY2025; up 19 since FY2020.
82	Science Applications International Corporation Through Asrc Federal Facilities Logistics, LLC Top agencies DLA (Defense Logistics Agency)	$208,814	0.2%	Rank history: #27 in FY2022, #26 in FY2023, #98 in FY2024 and not on the FY2025 list; up 12 since FY2020.
83	Troy Tube & Manufacturing Co Top agencies DLA (Defense Logistics Agency)	$199,812	0.2%	Rank history: #93 in FY2022, #80 in FY2023, not on the FY2024 list and #54 in FY2025; down 34 since FY2020.
84	Sargent Aerospace & Defense LLC Top agencies DLA (Defense Logistics Agency)	$199,459	0.2%	Rank history: #71 in FY2022, #86 in FY2023, #79 in FY2024 and not on the FY2025 list; down 61 since FY2020.
85	Robeck Fluid Power Co. Top agencies DLA (Defense Logistics Agency)	$193,393	0.2%	Rank history: not on the FY2022–FY2023 lists, #40 in FY2024 and not on the FY2025 list; up 68 since FY2020.
86	Global Logistics Strategies Inc. Top agencies DLA (Defense Logistics Agency)	$185,676	0.2%	Rank history: #43 in FY2022, #76 in FY2023, not on the FY2024 list and #51 in FY2025; down 33 since FY2020.
87	Control Factors-Seattle, Inc. Top agencies DLA (Defense Logistics Agency)	$184,649	0.2%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 46 since FY2020.
88	Triad Technologies LLC Top agencies DLA (Defense Logistics Agency)	$183,446	0.2%	Rank history: not on the FY2022–FY2025 lists; up 91 since FY2020.
89	Republic Brass Sales Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$182,498	0.2%	Rank history: #35 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 256 since FY2020.
90	Apex Pinnacle Corp Top agencies DLA (Defense Logistics Agency)	$182,070	0.2%	Rank history: #51 in FY2022, not on the FY2023 list, #47 in FY2024 and #43 in FY2025; down 17 since FY2020.
91	Aviarms Support Corp Top agencies DLA (Defense Logistics Agency)	$181,279	0.2%	Rank history: #68 in FY2022, #42 in FY2023, #93 in FY2024 and not on the FY2025 list; down 35 since FY2020.
92	World Wide Fittings Inc. Top agencies DLA (Defense Logistics Agency)	$175,679	0.2%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; down 38 since FY2020.
93	Wesco Aircraft Hardware Corp. Top agencies DLA (Defense Logistics Agency)	$160,410	0.2%	Rank history: not on the FY2022–FY2025 lists; up 93 since FY2020.
94	Marotta Controls Inc. Top agencies DLA (Defense Logistics Agency)	$155,705	0.2%	Rank history: not on the FY2022 list, #47 in FY2023, #50 in FY2024 and #93 in FY2025; down 25 since FY2020.
95	QPI Pro, Inc. Top agencies DLA (Defense Logistics Agency)	$150,412	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Eagle Equipment Corporation Top agencies DLA (Defense Logistics Agency)	$150,160	0.2%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; up 58 since FY2020.
97	Rudy Iii, Ernest Top agencies DLA (Defense Logistics Agency)	$149,841	0.2%	Rank history: #19 in FY2022, #70 in FY2023, #62 in FY2024 and #59 in FY2025; unchanged since FY2020.
98	Dredge Constructors LLC Top agencies Army (Department of the Army)	$149,370	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Technifab Products Inc. Top agencies USAF (Department of the Air Force)	$148,605	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Global Incorporated Top agencies DLA (Defense Logistics Agency)	$141,114	0.2%	Rank history: not on the FY2022–FY2023 lists, #24 in FY2024 and #82 in FY2025; down 12 since FY2020.

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100 of 874 contractors listed here. See the rest on GovTribe.

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 $85.1 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 332996 contractors in FY2021?

1. Transdigm Group Incorporated ($6.38M), 2. Federal Resources Supply Company ($5.08M), 3. Aarcorp ($3.96M), 4. Triman Industries Inc. ($2.26M), 5. Eaton-Aeroquip Inc. ($1.73M), 6. ITL LLC ($1.29M), 7. Indiana Fluid Systems Solutions LLC ($1.21M), 8. Aero-Dyne Supply Co., Inc. ($1.18M), 9. Kampi Components Co Inc. ($1.14M), 10. Eaton Corporation ($1.08M).

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