Top 100 Contractors in PSC 5331: O-Ring, FY2021

Name: Top 100 Contractors in PSC 5331: O-Ring, FY2021
Creator: GovTribe

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

The top 10 won 39% of FY2021 PSC 5331 contract dollars

Contract obligations: $10,711,780 Net of deobligations, by contracts coded PSC 5331
Contractors: 429 Parent companies with an obligation
Largest contractor: RTX Corporation $1.24 million, 11.0% 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	RTX Corporation 8 awardees, including Goodrich Corporation, Hamilton Sundstrand Corporation and Rockwell Collins, Inc. Top agencies DLA (Defense Logistics Agency)	$1,244,068	11.0%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	DBR Industries, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$795,304	7.0%	Rank history: #2 in FY2022, #2 in FY2023, #3 in FY2024 and #2 in FY2025; up 1 since FY2020.
3	Westsim Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$439,486	3.9%	Rank history: not on the FY2022–FY2025 lists; up 279 since FY2020.
4	Blade Industrial Products Inc. Top agencies DLA (Defense Logistics Agency)	$420,535	3.7%	Rank history: #3 in FY2022, #4 in FY2023, #4 in FY2024 and #10 in FY2025; unchanged since FY2020.
5	Jamaica Bearings Co., Inc. 3 awardees Top agencies DLA (Defense Logistics Agency)	$347,617	3.1%	Rank history: #20 in FY2022, #17 in FY2023, #44 in FY2024 and #32 in FY2025; down 3 since FY2020.
6	Aarcorp Through AAR Supply Chain, Inc. Top agencies DLA (Defense Logistics Agency)	$312,704	2.8%	Rank history: #28 in FY2022, #19 in FY2023, #49 in FY2024 and not on the FY2025 list; up 19 since FY2020.
7	Heico Aerospace Corporat Through Seal Dynamics LLC Top agencies DLA (Defense Logistics Agency)	$264,022	2.3%	Rank history: #6 in FY2022, #16 in FY2023, #8 in FY2024 and #20 in FY2025; up 29 since FY2020.
8	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$213,973	1.9%	Rank history: #9 in FY2022, #13 in FY2023, #9 in FY2024 and #52 in FY2025; up 12 since FY2020.
9	Thermocoax Inc Top agencies USAF (Department of the Air Force)	$210,390	1.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
10	Meggitt PLC 3 awardees, including Meggitt Aircraft Braking Systems Corporation and Meggitt Defense Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$204,369	1.8%	Rank history: #13 in FY2022 and not on the FY2023–FY2025 lists; up 14 since FY2020.
11	The Boeing Company 5 awardees, including Boeing Distribution Services X, Inc., Boeing Distribution Services Defense LLC and Boeing Distribution, Inc. Top agencies DLA (Defense Logistics Agency)	$183,564	1.6%	Rank history: #8 in FY2022, #6 in FY2023, #12 in FY2024 and #29 in FY2025; down 6 since FY2020.
12	Transdigm Group Incorporated 5 awardees, including Arkwin Industries, Inc., Aerocontrolex Group, Inc. and Tactair Fluid Controls Inc. Top agencies DLA (Defense Logistics Agency)	$179,722	1.6%	Rank history: #43 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
13	General Electric Company 4 awardees, including GE Aviation Systems LLC and GE Engine Services Distribution, L.L.C. Top agencies DLA (Defense Logistics Agency)	$175,724	1.5%	Rank history: #21 in FY2022, #14 in FY2023, #6 in FY2024 and #9 in FY2025; down 7 since FY2020.
14	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$168,606	1.5%	Rank history: #12 in FY2022, #63 in FY2023, #20 in FY2024 and #41 in FY2025; down 6 since FY2020.
15	Dela Technology Corporation Top agencies DLA (Defense Logistics Agency)	$167,767	1.5%	Rank history: #37 in FY2022, #57 in FY2023, #52 in FY2024 and #25 in FY2025; down 3 since FY2020.
16	BBA Aviation PLC Through Ontic Engineering & Manufacturing, Inc. Top agencies DLA (Defense Logistics Agency)	$163,047	1.4%	Rank history: not on the FY2022 list, #21 in FY2023 and not on the FY2024–FY2025 lists; up 99 since FY2020.
17	Lynn Electronics LLC Top agencies DLA (Defense Logistics Agency)	$162,346	1.4%	Rank history: #19 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
18	ES3 Prime Logistics Group Inc. Top agencies DLA (Defense Logistics Agency)	$158,539	1.4%	Rank history: #4 in FY2022, #18 in FY2023, #37 in FY2024 and #39 in FY2025; down 9 since FY2020.
19	Science Applications International Corporation Through Asrc Federal Facilities Logistics, LLC Top agencies DLA (Defense Logistics Agency)	$155,552	1.4%	Rank history: #27 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
20	Caterpillar Inc. Top agencies DLA (Defense Logistics Agency)	$153,979	1.4%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
21	MCI Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$137,025	1.2%	Rank history: not on the FY2022–FY2025 lists; up 46 since FY2020.
22	MSA Safety Sales LLC Top agencies DHS (Department of Homeland Security)	$131,523	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$131,511	1.2%	Rank history: #14 in FY2022, #24 in FY2023, #19 in FY2024 and #28 in FY2025; down 16 since FY2020.
24	FBC Enterprises LLC Top agencies DLA (Defense Logistics Agency)	$125,271	1.1%	Rank history: #10 in FY2022, #42 in FY2023, #5 in FY2024 and #38 in FY2025; new, not ranked in FY2020.
25	Quest PAK Inc. Top agencies DLA (Defense Logistics Agency)	$100,548	0.9%	Rank history: #34 in FY2022, #23 in FY2023, #86 in FY2024 and not on the FY2025 list; up 2 since FY2020.
26	SAFRAN 4 awardees, including Safran Landing Systems, Safran Electrical Components Canada Inc. and Air Cruisers Company, LLC Top agencies DLA (Defense Logistics Agency)	$100,338	0.9%	Rank history: #30 in FY2022, #52 in FY2023, #67 in FY2024 and #68 in FY2025; up 20 since FY2020.
27	Cupp's Industrial Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$99,818	0.9%	Rank history: not on the FY2022–FY2025 lists; up 169 since FY2020.
28	Honeywell International Inc. 3 awardees Top agencies DLA (Defense Logistics Agency)	$99,193	0.9%	Rank history: #49 in FY2022, #28 in FY2023, #10 in FY2024 and #15 in FY2025; up 4 since FY2020.
29	Longhorn Regional Service Center, LLC Top agencies DLA (Defense Logistics Agency)	$96,808	0.9%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; up 108 since FY2020.
30	Hamilton Sundstrand Corporation Top agencies DLA (Defense Logistics Agency)	$96,404	0.8%	Rank history: not on the FY2022–FY2025 lists; up 88 since FY2020.
31	Janels Industries Inc. Top agencies DLA (Defense Logistics Agency)	$96,109	0.8%	Rank history: not on the FY2022 list, #10 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
32	Warren Industries Inc. Top agencies Navy (Department of the Navy)	$92,723	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	Brighton Cromwell LLC Top agencies DLA (Defense Logistics Agency)	$92,679	0.8%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; down 18 since FY2020.
34	Larkos Packing and Distribution Inc. Top agencies DLA (Defense Logistics Agency)	$90,646	0.8%	Rank history: #42 in FY2022, #53 in FY2023, #43 in FY2024 and #35 in FY2025; up 5 since FY2020.
35	DC Fabricators Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$89,950	0.8%	Rank history: #44 in FY2022, #58 in FY2023, #89 in FY2024 and #30 in FY2025; down 21 since FY2020.
36	Washington Foundries Inc. Top agencies DLA (Defense Logistics Agency)	$86,200	0.8%	Rank history: #31 in FY2022, #40 in FY2023, #58 in FY2024 and #43 in FY2025; down 8 since FY2020.
37	Sealing Specialists & Service Co Top agencies Navy (Department of the Navy)	$82,853	0.7%	Rank history: #74 in FY2022, not on the FY2023 list, #61 in FY2024 and #59 in FY2025; up 59 since FY2020.
38	MDF Technologies Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$81,251	0.7%	Rank history: #55 in FY2022, #43 in FY2023, #59 in FY2024 and not on the FY2025 list; down 8 since FY2020.
39	Pacific Power Group LLC Top agencies DHS (Department of Homeland Security)	$78,732	0.7%	Rank history: not on the FY2022 list, #86 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
40	Renk Systems Corporation Top agencies Navy (Department of the Navy)	$76,901	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
41	Transaero, Inc. Top agencies DLA (Defense Logistics Agency)	$69,894	0.6%	Rank history: #22 in FY2022, #11 in FY2023, #26 in FY2024 and #31 in FY2025; down 20 since FY2020.
42	Moog Inc. 3 awardees Top agencies DLA (Defense Logistics Agency)	$68,679	0.6%	Rank history: #54 in FY2022, #66 in FY2023, #41 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
43	Bourbon Seals LLC Top agencies DLA (Defense Logistics Agency)	$68,133	0.6%	Rank history: #16 in FY2022, #25 in FY2023, #28 in FY2024 and #12 in FY2025; up 263 since FY2020.
44	Fitzhugh Clifton Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$60,592	0.5%	Rank history: #45 in FY2022, #78 in FY2023, #78 in FY2024 and #87 in FY2025; up 1 since FY2020.
45	Johnson Controls Security Solutions LLC Through Johnson Controls Navy Systems, LLC Top agencies DLA (Defense Logistics Agency)	$54,433	0.5%	Rank history: #38 in FY2022, #50 in FY2023, #69 in FY2024 and not on the FY2025 list; down 12 since FY2020.
46	Parker-Hannifin Corporation 2 awardees Top agencies DLA (Defense Logistics Agency)	$50,212	0.4%	Rank history: not on the FY2022 list, #56 in FY2023, #93 in FY2024 and not on the FY2025 list; up 55 since FY2020.
47	Statz Corp Top agencies DLA (Defense Logistics Agency)	$49,257	0.4%	Rank history: #52 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; down 29 since FY2020.
48	U.s.a. Spares Inc. Top agencies Navy (Department of the Navy)	$47,950	0.4%	Rank history: #48 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
49	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency)	$44,247	0.4%	Rank history: #17 in FY2022, #9 in FY2023, #7 in FY2024 and #16 in FY2025; down 15 since FY2020.
50	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$41,993	0.4%	Rank history: #46 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; down 37 since FY2020.
51	Direct Line, Inc. Top agencies DLA (Defense Logistics Agency)	$40,321	0.4%	Rank history: #24 in FY2022, not on the FY2023 list, #46 in FY2024 and #96 in FY2025; up 149 since FY2020.
52	Mechanical Rubber Products Company, Inc. Top agencies DLA (Defense Logistics Agency)	$39,835	0.4%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 294 since FY2020.
53	Fabrication Designs, Inc. Top agencies DOS (Department of State)	$38,472	0.3%	Rank history: not on the FY2022–FY2025 lists; up 116 since FY2020.
54	Triad Technologies LLC Top agencies DLA (Defense Logistics Agency)	$38,251	0.3%	Rank history: not on the FY2022–FY2025 lists; up 136 since FY2020.
55	Johnson & Towers Inc. Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$35,403	0.3%	Rank history: not on the FY2022 list, #71 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
56	Seahorse Defense Supply, LLC Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$34,367	0.3%	Rank history: not on the FY2022 list, #65 in FY2023, not on the FY2024 list and #72 in FY2025; new, not ranked in FY2020.
57	Megabite Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$32,503	0.3%	Rank history: not on the FY2022–FY2025 lists; up 270 since FY2020.
58	Netkomp, Inc. Top agencies DLA (Defense Logistics Agency)	$32,303	0.3%	Rank history: not on the FY2022–FY2025 lists; up 197 since FY2020.
59	ECI Defense Group, Inc. Top agencies DLA (Defense Logistics Agency)	$31,493	0.3%	Rank history: #26 in FY2022, #7 in FY2023, #17 in FY2024 and #8 in FY2025; down 18 since FY2020.
60	Ohio Machinery Co Top agencies DLA (Defense Logistics Agency)	$30,455	0.3%	Rank history: #82 in FY2022, #68 in FY2023, not on the FY2024 list and #46 in FY2025; down 17 since FY2020.
61	Transupport Inc. Top agencies DLA (Defense Logistics Agency)	$30,102	0.3%	Rank history: #100 in FY2022, not on the FY2023 list, #90 in FY2024 and not on the FY2025 list; up 260 since FY2020.
62	Mhd-Rockland Inc. Top agencies DLA (Defense Logistics Agency)	$29,233	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Greenwich AeroGroup Inc. Through Aero Precision Industries LLC Top agencies DLA (Defense Logistics Agency)	$28,814	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Diamond Industrial Inc. Top agencies DLA (Defense Logistics Agency)	$27,220	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Noresco LLC 2 awardees, including Kidde Technologies Inc. Top agencies DLA (Defense Logistics Agency)	$27,096	0.2%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
66	ITL LLC Top agencies DLA (Defense Logistics Agency)	$26,132	0.2%	Rank history: not on the FY2022–FY2025 lists; up 80 since FY2020.
67	Critical Solutions International, LLC Top agencies DLA (Defense Logistics Agency)	$25,719	0.2%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
68	CFM International Inc. Top agencies DLA (Defense Logistics Agency)	$25,283	0.2%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; up 41 since FY2020.
69	Federal Resources Supply Company Top agencies DLA (Defense Logistics Agency)	$24,704	0.2%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
70	Braketechnique Inc. Top agencies DLA (Defense Logistics Agency)	$24,397	0.2%	Rank history: not on the FY2022–FY2025 lists; up 123 since FY2020.
71	Allied Defense Industries Inc. 2 awardees, including Aero International, LLC Top agencies DLA (Defense Logistics Agency)	$23,414	0.2%	Rank history: #39 in FY2022, #47 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
72	Stag Enterprise, Inc. Top agencies DLA (Defense Logistics Agency)	$21,669	0.2%	Rank history: not on the FY2022–FY2025 lists; up 20 since FY2020.
73	DSP Enterprises, Inc. Top agencies DLA (Defense Logistics Agency)	$21,660	0.2%	Rank history: not on the FY2022–FY2025 lists; up 58 since FY2020.
74	Warfighter Focused Logistics Inc. Top agencies DLA (Defense Logistics Agency)	$21,532	0.2%	Rank history: #23 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
75	Woodward Governor Company Through Woodward HRT Inc. Top agencies DLA (Defense Logistics Agency)	$21,208	0.2%	Rank history: not on the FY2022–FY2023 lists, #80 in FY2024 and not on the FY2025 list; up 18 since FY2020.
76	Dutch Valley Supply Co. Top agencies DLA (Defense Logistics Agency)	$21,027	0.2%	Rank history: not on the FY2022 list, #51 in FY2023, not on the FY2024 list and #97 in FY2025; down 18 since FY2020.
77	Airbus Americas Inc. Through Airbus Helicopters, Inc. Top agencies DHS (Department of Homeland Security)	$21,020	0.2%	Rank history: #15 in FY2022, not on the FY2023 list, #84 in FY2024 and not on the FY2025 list; down 9 since FY2020.
78	Lockheed Martin Corporation 4 awardees, including Sikorsky Aircraft Corporation and Derco Aerospace, Inc. Top agencies DLA (Defense Logistics Agency)	$20,902	0.2%	Rank history: #47 in FY2022, #20 in FY2023, #56 in FY2024 and #34 in FY2025; down 67 since FY2020.
79	Gigli Enterprises, Inc. Top agencies DLA (Defense Logistics Agency)	$20,787	0.2%	Rank history: not on the FY2022–FY2025 lists; up 49 since FY2020.
80	Leonardo S.p.A. 3 awardees, including DRS Naval Power Systems Inc. and Engineered Coil Company Top agencies DLA (Defense Logistics Agency)	$20,267	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Patterson Cooney Inc. Top agencies DLA (Defense Logistics Agency)	$20,044	0.2%	Rank history: #83 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
82	Rolls-Royce Military Aero Engines Ltd 3 awardees, including Rolls-Royce Corporation and Rolls-Royce Solutions America Inc. Top agencies DLA (Defense Logistics Agency)	$19,990	0.2%	Rank history: #36 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
83	General Tool Company Top agencies DLA (Defense Logistics Agency)	$18,578	0.2%	Rank history: #99 in FY2022, #89 in FY2023, #57 in FY2024 and #48 in FY2025; up 14 since FY2020.
84	TNL Sales LLC Top agencies DLA (Defense Logistics Agency)	$18,103	0.2%	Rank history: #33 in FY2022, #37 in FY2023, #38 in FY2024 and #79 in FY2025; down 28 since FY2020.
85	Foxtronix Inc. Top agencies DLA (Defense Logistics Agency)	$17,019	0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 127 since FY2020.
86	Volkswagen AG 2 awardees, including Renk Systems Corp and Everllence USA Inc. Top agencies DLA (Defense Logistics Agency)	$16,958	0.1%	Rank history: not on the FY2022–FY2025 lists; up 175 since FY2020.
87	Scott Industrial Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$16,685	0.1%	Rank history: not on the FY2022–FY2025 lists; up 245 since FY2020.
88	Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$16,228	0.1%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; down 59 since FY2020.
89	Marotta Controls Inc. Top agencies DLA (Defense Logistics Agency)	$16,028	0.1%	Rank history: #64 in FY2022, #35 in FY2023, #65 in FY2024 and #61 in FY2025; down 34 since FY2020.
90	New Era Contract Sales Inc. Top agencies DLA (Defense Logistics Agency)	$15,980	0.1%	Rank history: #18 in FY2022 and not on the FY2023–FY2025 lists; up 126 since FY2020.
91	L3Harris Technologies, Inc. 2 awardees, including L3 Technologies, Inc. Top agencies DLA (Defense Logistics Agency)	$15,630	0.1%	Rank history: #88 in FY2022, not on the FY2023 list, #22 in FY2024 and not on the FY2025 list; up 7 since FY2020.
92	Burhani Enterprises Inc. Top agencies DLA (Defense Logistics Agency)	$15,507	0.1%	Rank history: not on the FY2022–FY2025 lists; down 27 since FY2020.
93	Kit Pack, LLC Top agencies DLA (Defense Logistics Agency)	$15,411	0.1%	Rank history: not on the FY2022–FY2025 lists; up 56 since FY2020.
94	Dimo Corp Top agencies DLA (Defense Logistics Agency)	$15,392	0.1%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
95	S I T Corporation Top agencies DLA (Defense Logistics Agency)	$14,316	0.1%	Rank history: #29 in FY2022, #80 in FY2023, #40 in FY2024 and #45 in FY2025; down 13 since FY2020.
96	Fincantieri Marine Systems North America Inc. Top agencies DLA (Defense Logistics Agency)	$14,301	0.1%	Rank history: #77 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
97	A.m.s. Network, LLC Top agencies DLA (Defense Logistics Agency)	$14,138	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Allied Marine Services LLC Top agencies DLA (Defense Logistics Agency)	$13,701	0.1%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
99	Lake Shore Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$13,606	0.1%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; up 130 since FY2020.
100	Dreamfind, Inc. Top agencies DLA (Defense Logistics Agency)	$13,293	0.1%	Rank history: #65 in FY2022, #75 in FY2023, #68 in FY2024 and #73 in FY2025; up 267 since FY2020.

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100 of 429 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 $11.3 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 PSC 5331 contractors in FY2021?

1. RTX Corporation ($1.24M), 2. DBR Industries, Inc. ($795K), 3. Westsim Engineering, Inc. ($439K), 4. Blade Industrial Products Inc. ($421K), 5. Jamaica Bearings Co., Inc. ($348K), 6. Aarcorp ($313K), 7. Heico Aerospace Corporat ($264K), 8. Pioneer Industries, LLC ($214K), 9. Thermocoax Inc ($210K), 10. Meggitt PLC ($204K).

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