Top 100 Contractors in PSC 5355: Knobs and Pointers, FY2021

Name: Top 100 Contractors in PSC 5355: Knobs and Pointers, FY2021
Creator: GovTribe

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

The top 10 won 51% of FY2021 PSC 5355 contract dollars

Contract obligations: $2,950,988 Net of deobligations, by contracts coded PSC 5355
Contractors: 235 Parent companies with an obligation
Largest contractor: Dimo Corp $624 thousand, 20.1% 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	Dimo Corp Top agencies DLA (Defense Logistics Agency)	$624,192	20.1%	Rank history: not on the FY2022 list, #2 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
2	Aarcorp Through AAR Supply Chain, Inc. Top agencies DLA (Defense Logistics Agency)	$174,838	5.6%	Rank history: #1 in FY2022, #5 in FY2023, #5 in FY2024 and not on the FY2025 list; up 1 since FY2020.
3	Linmarr Associates, Inc. Top agencies DLA (Defense Logistics Agency)	$139,332	4.5%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
4	L3Harris Technologies, Inc. Through CAE USA Inc. Top agencies Navy (Department of the Navy)	$114,601	3.7%	Rank history: #18 in FY2022, #22 in FY2023, not on the FY2024 list and #86 in FY2025; up 168 since FY2020.
5	Network 1 Financial Group Inc. Through Electronic Hardware Corp Top agencies DLA (Defense Logistics Agency)	$106,296	3.4%	Rank history: #2 in FY2022, #3 in FY2023, #11 in FY2024 and not on the FY2025 list; up 1 since FY2020.
6	Solar Nebula LLC Top agencies DLA (Defense Logistics Agency)	$100,510	3.2%	Rank history: #32 in FY2022, not on the FY2023 list, #42 in FY2024 and not on the FY2025 list; down 2 since FY2020.
7	Ruta Supplies Inc. Top agencies DLA (Defense Logistics Agency)	$100,303	3.2%	Rank history: #5 in FY2022, #9 in FY2023, #12 in FY2024 and #96 in FY2025; up 24 since FY2020.
8	Grauch Enterprises, Inc. Top agencies DLA (Defense Logistics Agency)	$94,384	3.0%	Rank history: #17 in FY2022, #41 in FY2023, #25 in FY2024 and #58 in FY2025; up 9 since FY2020.
9	Transdigm Group Incorporated 2 awardees, including Transicoil LLC and Mason Electric Co. Top agencies DLA (Defense Logistics Agency)	$65,185	2.1%	Rank history: #6 in FY2022, #7 in FY2023, #65 in FY2024 and not on the FY2025 list; up 27 since FY2020.
10	Jamaica Bearings Co., Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$63,824	2.1%	Rank history: #27 in FY2022, #27 in FY2023, not on the FY2024 list and #20 in FY2025; up 38 since FY2020.
11	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency)	$60,954	2.0%	Rank history: #3 in FY2022, #4 in FY2023, #4 in FY2024 and #5 in FY2025; down 10 since FY2020.
12	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency)	$52,031	1.7%	Rank history: #10 in FY2022, #64 in FY2023, #10 in FY2024 and #12 in FY2025; up 28 since FY2020.
13	Am General LLC Top agencies DLA (Defense Logistics Agency)	$49,594	1.6%	Rank history: #11 in FY2022, #17 in FY2023, #57 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
14	AWS Industries Inc. Top agencies DLA (Defense Logistics Agency)	$44,143	1.4%	Rank history: not on the FY2022–FY2025 lists; up 162 since FY2020.
15	Windward Enterprises, LLC Top agencies DLA (Defense Logistics Agency)	$37,339	1.2%	Rank history: not on the FY2022 list, #62 in FY2023, #79 in FY2024 and #64 in FY2025; new, not ranked in FY2020.
16	Lynn Electronics LLC Top agencies DLA (Defense Logistics Agency)	$37,289	1.2%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; up 17 since FY2020.
17	Rhinestahl Corporation Top agencies DLA (Defense Logistics Agency)	$36,312	1.2%	Rank history: #14 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
18	Ontic Engineering & Manufacturing, Inc. 2 awardees, including Firstmark Aerospace Corp Top agencies DLA (Defense Logistics Agency)	$35,139	1.1%	Rank history: #43 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
19	Moog Inc. Top agencies DLA (Defense Logistics Agency)	$33,125	1.1%	Rank history: not on the FY2022–FY2023 lists, #3 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
20	Aviation Procurement Systems, LLC Top agencies DLA (Defense Logistics Agency)	$32,722	1.1%	Rank history: #8 in FY2022, #85 in FY2023, #37 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
21	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$31,594	1.0%	Rank history: #56 in FY2022, #19 in FY2023, #34 in FY2024 and not on the FY2025 list; down 1 since FY2020.
22	Spencer Industries Inc. Top agencies DLA (Defense Logistics Agency)	$31,050	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	RTX Corporation 3 awardees, including Rockwell Collins, Inc. and Simmonds Precision Products Inc. Top agencies DLA (Defense Logistics Agency)	$30,106	1.0%	Rank history: #24 in FY2022, #12 in FY2023, #2 in FY2024 and not on the FY2025 list; down 13 since FY2020.
24	Unified Door and Hardware Group, LLC Through Liberty Door Systems LLC Top agencies VA (Department of Veterans Affairs)	$28,580	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
25	Bowmar LLC Top agencies DLA (Defense Logistics Agency)	$27,873	0.9%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
26	BBA Aviation PLC 2 awardees, including Ontic Engineering & Manufacturing UK Limited and Ontic Engineering & Manufacturing, Inc. Top agencies DLA (Defense Logistics Agency)	$26,294	0.8%	Rank history: not on the FY2022 list, #60 in FY2023, #56 in FY2024 and not on the FY2025 list; down 13 since FY2020.
27	Rolls-Royce Military Aero Engines Ltd 2 awardees, including Rolls-Royce PLC Top agencies DLA (Defense Logistics Agency)	$23,518	0.8%	Rank history: not on the FY2022–FY2025 lists; up 77 since FY2020.
28	Dreamfind, Inc. Top agencies DLA (Defense Logistics Agency)	$20,341	0.7%	Rank history: not on the FY2022 list, #35 in FY2023, #50 in FY2024 and #65 in FY2025; up 64 since FY2020.
29	Air Shunt Instruments, Inc. Top agencies DLA (Defense Logistics Agency)	$19,050	0.6%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
30	Derand Precision LLC Top agencies DLA (Defense Logistics Agency)	$18,997	0.6%	Rank history: #33 in FY2022, not on the FY2023–FY2024 lists and #26 in FY2025; new, not ranked in FY2020.
31	Dela Technology Corporation Top agencies DLA (Defense Logistics Agency)	$18,939	0.6%	Rank history: #22 in FY2022, #40 in FY2023, not on the FY2024 list and #16 in FY2025; down 2 since FY2020.
32	Integrated Procurement Technologies 2 awardees Top agencies DLA (Defense Logistics Agency)	$18,243	0.6%	Rank history: not on the FY2022–FY2023 lists, #7 in FY2024 and #2 in FY2025; up 30 since FY2020.
33	The Boeing Company 3 awardees, including Boeing Distribution Services X, Inc. Top agencies DLA (Defense Logistics Agency)	$17,647	0.6%	Rank history: not on the FY2022 list, #20 in FY2023, #38 in FY2024 and #51 in FY2025; down 28 since FY2020.
34	WKF (Friedman) Enterprises, Inc. Top agencies DLA (Defense Logistics Agency)	$16,635	0.5%	Rank history: not on the FY2022–FY2024 lists and #3 in FY2025; down 9 since FY2020.
35	Parker-Hannifin Corporation Top agencies DLA (Defense Logistics Agency)	$15,965	0.5%	Rank history: #4 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 28 since FY2020.
36	Lockheed Martin Corporation 2 awardees, including Sikorsky Aircraft Corporation Top agencies DLA (Defense Logistics Agency)	$15,020	0.5%	Rank history: #58 in FY2022, #25 in FY2023, #43 in FY2024 and #36 in FY2025; down 17 since FY2020.
37	Netkomp, Inc. Top agencies DLA (Defense Logistics Agency)	$14,882	0.5%	Rank history: #35 in FY2022, #47 in FY2023, #28 in FY2024 and not on the FY2025 list; up 72 since FY2020.
38	Electronic Hardware Corp Top agencies DLA (Defense Logistics Agency)	$14,097	0.5%	Rank history: #100 in FY2022, not on the FY2023 list, #8 in FY2024 and #8 in FY2025; down 11 since FY2020.
39	Qual-TEC Management Corp Through Carp Industries Corp Top agencies DLA (Defense Logistics Agency)	$13,371	0.4%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; up 17 since FY2020.
40	Freehold Manufacturing Assembly Company, Inc. Top agencies DLA (Defense Logistics Agency)	$13,140	0.4%	Rank history: not on the FY2022 list, #38 in FY2023, not on the FY2024 list and #23 in FY2025; up 89 since FY2020.
41	Honeywell International Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$13,041	0.4%	Rank history: #9 in FY2022, not on the FY2023 list, #14 in FY2024 and #21 in FY2025; down 25 since FY2020.
42	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$12,575	0.4%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; up 70 since FY2020.
43	Argo Turboserve Corporation Top agencies DLA (Defense Logistics Agency)	$12,506	0.4%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.
44	Dynalec Corporation Top agencies DLA (Defense Logistics Agency)	$12,332	0.4%	Rank history: not on the FY2022–FY2023 lists, #93 in FY2024 and #39 in FY2025; up 177 since FY2020.
45	The Scale People, Inc. Top agencies DLA (Defense Logistics Agency)	$12,300	0.4%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
46	Burhani Enterprises Inc. Top agencies DLA (Defense Logistics Agency)	$12,273	0.4%	Rank history: #72 in FY2022, #46 in FY2023, #22 in FY2024 and #17 in FY2025; up 51 since FY2020.
47	M-Tron Components, Inc. Top agencies DLA (Defense Logistics Agency)	$12,089	0.4%	Rank history: #44 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
48	Statz Corp Top agencies DLA (Defense Logistics Agency)	$11,876	0.4%	Rank history: #7 in FY2022 and not on the FY2023–FY2025 lists; down 24 since FY2020.
49	Century Metal Parts Corp Top agencies DLA (Defense Logistics Agency)	$11,375	0.4%	Rank history: #55 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
50	A & S Skill Machinists, Inc. Top agencies DLA (Defense Logistics Agency)	$11,311	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Aviarms Support Corp Top agencies DLA (Defense Logistics Agency)	$10,763	0.3%	Rank history: #21 in FY2022, #29 in FY2023, #44 in FY2024 and not on the FY2025 list; up 8 since FY2020.
52	CU Enterprises Ltd Through C U Enterprises Ltd Top agencies DLA (Defense Logistics Agency)	$10,084	0.3%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
53	Allied Defense Industries Inc. 2 awardees, including Aero International, LLC Top agencies DLA (Defense Logistics Agency)	$9,952	0.3%	Rank history: #30 in FY2022, #15 in FY2023, #45 in FY2024 and not on the FY2025 list; down 39 since FY2020.
54	Ameritech DIE & Mold South Inc. Top agencies DLA (Defense Logistics Agency)	$9,669	0.3%	Rank history: #59 in FY2022, not on the FY2023 list, #91 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
55	Cobham Advanced Electron Through Caes Systems LLC Top agencies DLA (Defense Logistics Agency)	$9,513	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	BAE Systems PLC 2 awardees, including BAE Systems Land & Armaments L.P. Top agencies DLA (Defense Logistics Agency)	$9,432	0.3%	Rank history: not on the FY2022–FY2023 lists, #27 in FY2024 and not on the FY2025 list; up 37 since FY2020.
57	Paramount Panels, Inc. Through Panob Corp Top agencies DLA (Defense Logistics Agency)	$9,360	0.3%	Rank history: #37 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; up 79 since FY2020.
58	CAE USA Inc. Top agencies Navy (Department of the Navy)	$8,753	0.3%	Rank history: #64 in FY2022, not on the FY2023 list, #18 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
59	Hydraulics International, Inc. Top agencies DLA (Defense Logistics Agency)	$8,593	0.3%	Rank history: not on the FY2022 list, #82 in FY2023, #52 in FY2024 and #27 in FY2025; up 35 since FY2020.
60	Adirondack Electronics Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$8,425	0.3%	Rank history: #34 in FY2022, #36 in FY2023, #49 in FY2024 and not on the FY2025 list; up 87 since FY2020.
61	Polytech Defense Spares LLC Top agencies DLA (Defense Logistics Agency)	$8,379	0.3%	Rank history: #80 in FY2022, not on the FY2023 list, #77 in FY2024 and #56 in FY2025; down 23 since FY2020.
62	SDG Global Technology LLC Top agencies DLA (Defense Logistics Agency)	$8,125	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Alamo Aircraft Supply Inc. Through Alamo Aircraft, Ltd. Top agencies DLA (Defense Logistics Agency)	$7,837	0.3%	Rank history: not on the FY2022–FY2025 lists; up 81 since FY2020.
64	Wright Source Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$7,749	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	C U Enterprises Ltd Top agencies DLA (Defense Logistics Agency)	$7,378	0.2%	Rank history: not on the FY2022–FY2025 lists; up 40 since FY2020.
66	Rolls-Royce Corporation Top agencies DLA (Defense Logistics Agency)	$7,090	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Crane Co Through Hydro-Aire Aerospace Corp Top agencies DLA (Defense Logistics Agency)	$6,885	0.2%	Rank history: #36 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
68	Rev-Cap Company, Inc. Top agencies DLA (Defense Logistics Agency)	$6,185	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Mason Electric Co. Top agencies DLA (Defense Logistics Agency)	$6,138	0.2%	Rank history: not on the FY2022 list, #67 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
70	Brylo Marine, Inc. Top agencies DLA (Defense Logistics Agency)	$6,044	0.2%	Rank history: not on the FY2022–FY2023 lists, #71 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
71	Salem Manufacturing & Sales Inc. Top agencies DLA (Defense Logistics Agency)	$5,984	0.2%	Rank history: not on the FY2022 list, #74 in FY2023, not on the FY2024 list and #47 in FY2025; up 128 since FY2020.
72	Jewell Instruments LLC Top agencies DLA (Defense Logistics Agency)	$5,941	0.2%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
73	Defense & Development Enterprises LLC Top agencies DLA (Defense Logistics Agency)	$5,776	0.2%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
74	Seiler Instrument and Manufacturing Company, Incorporated Top agencies DLA (Defense Logistics Agency)	$5,720	0.2%	Rank history: #52 in FY2022, #37 in FY2023, #21 in FY2024 and not on the FY2025 list; up 52 since FY2020.
75	Now Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$5,544	0.2%	Rank history: not on the FY2022–FY2023 lists, #95 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
76	In Speck Corp Top agencies Navy (Department of the Navy)	$5,518	0.2%	Rank history: #76 in FY2022, #50 in FY2023, #53 in FY2024 and not on the FY2025 list; up 44 since FY2020.
77	E W Yost Company Top agencies DLA (Defense Logistics Agency)	$5,400	0.2%	Rank history: #99 in FY2022, #68 in FY2023, #54 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
78	Marotta Controls Inc. Top agencies DLA (Defense Logistics Agency)	$5,400	0.2%	Rank history: #57 in FY2022, #77 in FY2023, #90 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
79	Noble Sales Co. Inc. Through Tactical & Survival Specialties, LLC Top agencies DLA (Defense Logistics Agency)	$5,232	0.2%	Rank history: #54 in FY2022, not on the FY2023 list, #1 in FY2024 and #1 in FY2025; new, not ranked in FY2020.
80	Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$5,177	0.2%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; down 25 since FY2020.
81	Orbital Parts Inc. Top agencies DLA (Defense Logistics Agency)	$5,000	0.2%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; up 143 since FY2020.
82	Vertical Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$4,731	0.2%	Rank history: not on the FY2022 list, #93 in FY2023, #81 in FY2024 and #83 in FY2025; up 88 since FY2020.
83	Wbb, Inc. Top agencies DLA (Defense Logistics Agency)	$4,676	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	VSE Corporation 2 awardees, including Wheeler Fleet Solutions, Co. Top agencies DLA (Defense Logistics Agency)	$4,675	0.2%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
85	Midway Industrial Supply Inc. Top agencies DLA (Defense Logistics Agency)	$4,647	0.1%	Rank history: not on the FY2022–FY2025 lists; up 71 since FY2020.
86	Nagano Keiki Co. Ltd. Through Ashcroft Inc. Top agencies DLA (Defense Logistics Agency)	$4,533	0.1%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
87	Precision Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$4,252	0.1%	Rank history: not on the FY2022 list, #51 in FY2023, #76 in FY2024 and not on the FY2025 list; up 81 since FY2020.
88	Theodor Wille Intertrade GMBH Through Atlantic Diving Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$4,215	0.1%	Rank history: #83 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; up 34 since FY2020.
89	S and J Military International, L.L.C. Top agencies DLA (Defense Logistics Agency)	$4,200	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Caterpillar Inc. Top agencies DLA (Defense Logistics Agency)	$4,125	0.1%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
91	Quality Aviation, Inc. Top agencies DLA (Defense Logistics Agency)	$3,967	0.1%	Rank history: not on the FY2022 list, #63 in FY2023, not on the FY2024 list and #59 in FY2025; up 43 since FY2020.
92	Federal Resources Supply Company Top agencies DLA (Defense Logistics Agency)	$3,940	0.1%	Rank history: not on the FY2022–FY2025 lists; up 90 since FY2020.
93	Empire Avionics Corp. Top agencies DLA (Defense Logistics Agency)	$3,855	0.1%	Rank history: #82 in FY2022, not on the FY2023 list, #85 in FY2024 and not on the FY2025 list; down 40 since FY2020.
94	Alliance Global Inc. Top agencies DLA (Defense Logistics Agency)	$3,670	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Dutch Valley Supply Co. Top agencies DLA (Defense Logistics Agency)	$3,568	0.1%	Rank history: not on the FY2022 list, #87 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
96	State Electronics Parts Corp. Top agencies DLA (Defense Logistics Agency)	$3,442	0.1%	Rank history: #16 in FY2022, #8 in FY2023, #31 in FY2024 and #25 in FY2025; down 5 since FY2020.
97	Optex Systems Inc. Top agencies DLA (Defense Logistics Agency)	$3,337	0.1%	Rank history: #48 in FY2022, #95 in FY2023, #33 in FY2024 and #31 in FY2025; down 56 since FY2020.
98	G.t. Machining & Fabricating Ltd. Top agencies DLA (Defense Logistics Agency)	$3,328	0.1%	Rank history: not on the FY2022 list, #92 in FY2023, not on the FY2024 list and #90 in FY2025; new, not ranked in FY2020.
99	IET Labs Inc. Top agencies DLA (Defense Logistics Agency)	$3,298	0.1%	Rank history: not on the FY2022–FY2025 lists; up 75 since FY2020.
100	ECI Defense Group, Inc. Top agencies DLA (Defense Logistics Agency)	$3,041	0.1%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; down 98 since FY2020.

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100 of 235 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 $3.11 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 5355 contractors in FY2021?

1. Dimo Corp ($624K), 2. Aarcorp ($175K), 3. Linmarr Associates, Inc. ($139K), 4. L3Harris Technologies, Inc. ($115K), 5. Network 1 Financial Group Inc. ($106K), 6. Solar Nebula LLC ($101K), 7. Ruta Supplies Inc. ($100K), 8. Grauch Enterprises, Inc. ($94.4K), 9. Transdigm Group Incorporated ($65.2K), 10. Jamaica Bearings Co., Inc. ($63.8K).

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