Top 100 Contractors in PSC 5320: Rivets, FY2021

Name: Top 100 Contractors in PSC 5320: Rivets, FY2021
Creator: GovTribe

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

The top 10 won 79% of FY2021 PSC 5320 contract dollars

Contract obligations: $31,366,323 Net of deobligations, by contracts coded PSC 5320
Contractors: 218 Parent companies with an obligation
Largest contractor: Science Applications International Corporation $13.1 million, 40.8% 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	Science Applications International Corporation Top agencies DLA (Defense Logistics Agency)	$13,068,941	40.8%	Rank history: #1 in FY2022, #1 in FY2023, #2 in FY2024 and not on the FY2025 list; unchanged since FY2020.
2	The Boeing Company 5 awardees, including Boeing Distribution Services Defense LLC, Boeing Distribution Services, Inc. and Boeing Distribution Services X, Inc. Top agencies DLA (Defense Logistics Agency)	$4,540,668	14.2%	Rank history: #2 in FY2022, #3 in FY2023, #4 in FY2024 and #2 in FY2025; unchanged since FY2020.
3	Peerless Aerospace, LLC Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,951,486	6.1%	Rank history: #3 in FY2022, #4 in FY2023, #6 in FY2024 and #6 in FY2025; unchanged since FY2020.
4	Rapid Rivet and Fastener Corporation Top agencies DLA (Defense Logistics Agency)	$1,188,594	3.7%	Rank history: #5 in FY2022, #6 in FY2023, #9 in FY2024 and #9 in FY2025; up 1 since FY2020.
5	Wesco Aircraft Hardware Corp. 2 awardees Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$1,066,333	3.3%	Rank history: #13 in FY2022, #14 in FY2023, #28 in FY2024 and not on the FY2025 list; up 5 since FY2020.
6	Adept Fasteners Inc. Top agencies DLA (Defense Logistics Agency)	$1,028,467	3.2%	Rank history: #8 in FY2022, #12 in FY2023, #12 in FY2024 and #3 in FY2025; up 1 since FY2020.
7	Lockheed Martin Corporation 3 awardees Top agencies DLA (Defense Logistics Agency)	$841,939	2.6%	Rank history: #6 in FY2022, #5 in FY2023, #5 in FY2024 and #5 in FY2025; down 3 since FY2020.
8	Don Industrial Group LLC Top agencies DLA (Defense Logistics Agency)	$613,382	1.9%	Rank history: #4 in FY2022, #7 in FY2023, #8 in FY2024 and #4 in FY2025; up 10 since FY2020.
9	Allfast Fastening Systems LLC 2 awardees Top agencies DLA (Defense Logistics Agency)	$537,165	1.7%	Rank history: #10 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
10	Defense Support Services, Inc. Top agencies DLA (Defense Logistics Agency)	$461,512	1.4%	Rank history: #23 in FY2022, #18 in FY2023, #13 in FY2024 and #12 in FY2025; down 2 since FY2020.
11	B S F (Business Solutions Fasteners) International Inc. Top agencies DLA (Defense Logistics Agency)	$435,762	1.4%	Rank history: #11 in FY2022, #9 in FY2023, #10 in FY2024 and #10 in FY2025; down 5 since FY2020.
12	Blue Sky Industries Inc. Through FDH Aero, LLC Top agencies DLA (Defense Logistics Agency)	$409,809	1.3%	Rank history: #15 in FY2022, #22 in FY2023, #59 in FY2024 and not on the FY2025 list; up 8 since FY2020.
13	H C Merchandisers, Inc. Top agencies DLA (Defense Logistics Agency)	$384,879	1.2%	Rank history: #12 in FY2022, #17 in FY2023, #14 in FY2024 and #19 in FY2025; up 4 since FY2020.
14	Meg Technologies, Inc. Top agencies DLA (Defense Logistics Agency)	$360,530	1.1%	Rank history: #14 in FY2022, #8 in FY2023, #7 in FY2024 and #14 in FY2025; up 5 since FY2020.
15	Apollo Aerospace Components LLC 2 awardees Top agencies DLA (Defense Logistics Agency)	$302,858	0.9%	Rank history: #9 in FY2022, #16 in FY2023, #17 in FY2024 and #18 in FY2025; up 24 since FY2020.
16	Good Vibes, LLC Top agencies DLA (Defense Logistics Agency)	$292,777	0.9%	Rank history: #19 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
17	Patriot Military Supply LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$232,125	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Alcoa Inc. Through Howmet Global Fastening Systems Inc. Top agencies DLA (Defense Logistics Agency)	$230,021	0.7%	Rank history: #24 in FY2022, #26 in FY2023, #33 in FY2024 and not on the FY2025 list; up 26 since FY2020.
19	Alpine Fastener & Hardware Inc. Top agencies DLA (Defense Logistics Agency)	$205,777	0.6%	Rank history: #17 in FY2022, #10 in FY2023, #16 in FY2024 and #16 in FY2025; down 7 since FY2020.
20	Stuart Industries, Ltd. Top agencies DLA (Defense Logistics Agency)	$203,485	0.6%	Rank history: #16 in FY2022, #19 in FY2023, #19 in FY2024 and #25 in FY2025; down 7 since FY2020.
21	T.p.s. Aviation Inc. Top agencies DLA (Defense Logistics Agency)	$197,891	0.6%	Rank history: #26 in FY2022, #27 in FY2023, #39 in FY2024 and #67 in FY2025; up 6 since FY2020.
22	ASC International, Inc. Top agencies DLA (Defense Logistics Agency)	$180,672	0.6%	Rank history: #18 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
23	Aircraft Hardware West Top agencies DLA (Defense Logistics Agency)	$180,493	0.6%	Rank history: not on the FY2022–FY2025 lists; up 42 since FY2020.
24	Statz Corp Top agencies DLA (Defense Logistics Agency)	$145,117	0.5%	Rank history: #52 in FY2022, #53 in FY2023, #18 in FY2024 and #34 in FY2025; up 2 since FY2020.
25	Birmingham Fastener & Supply Inc. Through Huntsville Fastener & Supply Inc. Top agencies DLA (Defense Logistics Agency)	$142,953	0.4%	Rank history: #29 in FY2022, #34 in FY2023, #49 in FY2024 and #21 in FY2025; up 21 since FY2020.
26	Simi Components, Inc. Top agencies DLA (Defense Logistics Agency)	$100,122	0.3%	Rank history: #41 in FY2022, #28 in FY2023, #27 in FY2024 and #28 in FY2025; up 22 since FY2020.
27	Boeing Distribution Services Defense LLC Top agencies DLA (Defense Logistics Agency)	$86,017	0.3%	Rank history: #7 in FY2022, #95 in FY2023, #32 in FY2024 and not on the FY2025 list; up 114 since FY2020.
28	Legacy Product Support Llc. Top agencies DLA (Defense Logistics Agency)	$82,129	0.3%	Rank history: #47 in FY2022, #29 in FY2023, #30 in FY2024 and #7 in FY2025; up 3 since FY2020.
29	Textron Inc. Through Bell Textron Inc. Top agencies DLA (Defense Logistics Agency)	$80,693	0.3%	Rank history: #27 in FY2022, #82 in FY2023, not on the FY2024 list and #84 in FY2025; up 13 since FY2020.
30	Century Fasteners Corp. 2 awardees Top agencies DLA (Defense Logistics Agency)	$75,408	0.2%	Rank history: #20 in FY2022, #38 in FY2023, not on the FY2024 list and #23 in FY2025; down 5 since FY2020.
31	FBC Enterprises LLC Top agencies DLA (Defense Logistics Agency)	$74,740	0.2%	Rank history: #25 in FY2022, #24 in FY2023, #15 in FY2024 and not on the FY2025 list; down 9 since FY2020.
32	Spec TECH USA Inc. Top agencies DLA (Defense Logistics Agency)	$71,269	0.2%	Rank history: #66 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
33	MCI Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$71,046	0.2%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
34	Guardian Rivet & Fastner Inc. Top agencies DLA (Defense Logistics Agency)	$69,943	0.2%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
35	Aero-Glen International LLC Top agencies DLA (Defense Logistics Agency)	$64,545	0.2%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
36	SEY Tec, Inc. Top agencies DLA (Defense Logistics Agency)	$58,505	0.2%	Rank history: #55 in FY2022, #50 in FY2023, #69 in FY2024 and not on the FY2025 list; up 67 since FY2020.
37	Defense Procurement Group, Inc. Top agencies DLA (Defense Logistics Agency)	$50,383	0.2%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
38	Ridewell Corporation Top agencies DLA (Defense Logistics Agency)	$50,043	0.2%	Rank history: #21 in FY2022, #32 in FY2023, #52 in FY2024 and not on the FY2025 list; up 18 since FY2020.
39	Lecuyer Aviation LLC Top agencies DLA (Defense Logistics Agency)	$49,175	0.2%	Rank history: not on the FY2022 list, #35 in FY2023, #43 in FY2024 and #69 in FY2025; new, not ranked in FY2020.
40	Crestwood Technology Group, LLC Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$48,327	0.2%	Rank history: not on the FY2022–FY2023 lists, #41 in FY2024 and #13 in FY2025; up 176 since FY2020.
41	Jamaica Bearings Co., Inc. Top agencies DLA (Defense Logistics Agency)	$46,728	0.1%	Rank history: not on the FY2022 list, #48 in FY2023, not on the FY2024 list and #40 in FY2025; new, not ranked in FY2020.
42	Tab Hardware, Inc. Top agencies DLA (Defense Logistics Agency)	$41,788	0.1%	Rank history: #35 in FY2022, #36 in FY2023, #31 in FY2024 and #60 in FY2025; down 2 since FY2020.
43	Bar Fields Inc. Top agencies DLA (Defense Logistics Agency)	$41,330	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	RTX Corporation Top agencies DLA (Defense Logistics Agency)	$39,230	0.1%	Rank history: not on the FY2022–FY2023 lists, #99 in FY2024 and not on the FY2025 list; down 10 since FY2020.
45	Parker-Hannifin Corporation 2 awardees Top agencies DLA (Defense Logistics Agency)	$38,841	0.1%	Rank history: #31 in FY2022, #62 in FY2023, #37 in FY2024 and not on the FY2025 list; up 13 since FY2020.
46	Lynn Electronics LLC Top agencies DLA (Defense Logistics Agency)	$36,375	0.1%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 22 since FY2020.
47	Netkomp, Inc. Top agencies DLA (Defense Logistics Agency)	$36,265	0.1%	Rank history: #51 in FY2022, #79 in FY2023, #76 in FY2024 and #76 in FY2025; up 109 since FY2020.
48	Spaires Inc. Top agencies DLA (Defense Logistics Agency)	$34,696	0.1%	Rank history: #39 in FY2022, #59 in FY2023, #70 in FY2024 and #82 in FY2025; up 23 since FY2020.
49	Boeing Distribution Services, Inc. Top agencies DLA (Defense Logistics Agency)	$33,385	0.1%	Rank history: #28 in FY2022, #78 in FY2023 and not on the FY2024–FY2025 lists; down 19 since FY2020.
50	C & D Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$32,751	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Standard Aero Parts, Inc. Top agencies DLA (Defense Logistics Agency)	$30,181	0.1%	Rank history: #64 in FY2022, #49 in FY2023, #42 in FY2024 and #53 in FY2025; up 2 since FY2020.
52	Treo Industries Inc. Top agencies DLA (Defense Logistics Agency)	$29,539	0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 35 since FY2020.
53	Broad Peak Defense LLC Top agencies DLA (Defense Logistics Agency)	$28,133	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Aviarms Support Corp Top agencies DLA (Defense Logistics Agency)	$26,867	0.1%	Rank history: #53 in FY2022, #31 in FY2023, #36 in FY2024 and #62 in FY2025; up 23 since FY2020.
55	Arizona Aero Fasteners, Inc. Top agencies DLA (Defense Logistics Agency)	$26,540	0.1%	Rank history: #34 in FY2022, #23 in FY2023, #24 in FY2024 and #22 in FY2025; down 6 since FY2020.
56	Vertical Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$25,874	0.1%	Rank history: #70 in FY2022, not on the FY2023 list, #87 in FY2024 and #61 in FY2025; up 4 since FY2020.
57	Allenboos LLC Top agencies DLA (Defense Logistics Agency)	$23,542	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Moog Inc. Top agencies DLA (Defense Logistics Agency)	$22,223	0.1%	Rank history: #80 in FY2022, #99 in FY2023, #57 in FY2024 and not on the FY2025 list; up 64 since FY2020.
59	R & M Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$22,202	0.1%	Rank history: #49 in FY2022, #30 in FY2023, #25 in FY2024 and #36 in FY2025; down 22 since FY2020.
60	Boeing Distribution Services X, Inc. Top agencies DLA (Defense Logistics Agency)	$22,049	0.1%	Rank history: #32 in FY2022, #100 in FY2023, not on the FY2024 list and #79 in FY2025; up 20 since FY2020.
61	Allied Tools, Inc. Top agencies DLA (Defense Logistics Agency)	$21,799	0.1%	Rank history: #36 in FY2022, #42 in FY2023, not on the FY2024 list and #93 in FY2025; up 121 since FY2020.
62	Bell Boeing Joint Project Office Top agencies DLA (Defense Logistics Agency)	$19,772	0.1%	Rank history: #54 in FY2022, #43 in FY2023, #60 in FY2024 and #39 in FY2025; unchanged since FY2020.
63	Mid-State Aerospace Inc. Top agencies DLA (Defense Logistics Agency)	$19,072	0.1%	Rank history: not on the FY2022–FY2025 lists; up 61 since FY2020.
64	General Electric Company 2 awardees Top agencies DLA (Defense Logistics Agency)	$17,935	0.1%	Rank history: #22 in FY2022, not on the FY2023 list, #68 in FY2024 and #75 in FY2025; new, not ranked in FY2020.
65	Sierra Pacific Supply Company Top agencies DLA (Defense Logistics Agency)	$17,730	0.1%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
66	Aantilia LLC Top agencies Navy (Department of the Navy)	$16,680	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Alamo Aircraft Supply Inc. Through Alamo Aircraft, Ltd. Top agencies DLA (Defense Logistics Agency)	$13,779	<0.1%	Rank history: #68 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; up 60 since FY2020.
68	Future Tecx LLC Top agencies DLA (Defense Logistics Agency)	$12,659	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	FDH Aero, LLC Top agencies DLA (Defense Logistics Agency)	$12,586	<0.1%	Rank history: not on the FY2022–FY2023 lists, #22 in FY2024 and #26 in FY2025; up 6 since FY2020.
70	Bright Lights Usa, Inc. Top agencies DLA (Defense Logistics Agency)	$12,504	<0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
71	American Defense Group LLC Top agencies DLA (Defense Logistics Agency)	$12,463	<0.1%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; up 52 since FY2020.
72	Acquisition Integration LLC Top agencies DLA (Defense Logistics Agency)	$11,662	<0.1%	Rank history: not on the FY2022 list, #92 in FY2023 and not on the FY2024–FY2025 lists; up 131 since FY2020.
73	Kwat Enterprises Corp. Top agencies DLA (Defense Logistics Agency)	$11,651	<0.1%	Rank history: #56 in FY2022, #81 in FY2023, #98 in FY2024 and #89 in FY2025; up 29 since FY2020.
74	Aero Defense Logistics LLC Top agencies DLA (Defense Logistics Agency)	$10,901	<0.1%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 43 since FY2020.
75	DMB Logistics, Inc. Top agencies DLA (Defense Logistics Agency)	$10,468	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 23 since FY2020.
76	Northrop Grumman Corporation Through Northrop Grumman Systems Corporation Top agencies DLA (Defense Logistics Agency)	$10,016	<0.1%	Rank history: not on the FY2022 list, #54 in FY2023 and not on the FY2024–FY2025 lists; down 47 since FY2020.
77	Cascade Nut & Bolt, Inc. Top agencies DLA (Defense Logistics Agency)	$9,391	<0.1%	Rank history: #76 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; up 35 since FY2020.
78	Honeywell International Inc. Top agencies DLA (Defense Logistics Agency)	$9,138	<0.1%	Rank history: #83 in FY2022, not on the FY2023 list, #23 in FY2024 and #73 in FY2025; down 63 since FY2020.
79	ATF Inc Through ATF Aerospace LLC Top agencies DLA (Defense Logistics Agency)	$9,026	<0.1%	Rank history: not on the FY2022 list, #39 in FY2023 and not on the FY2024–FY2025 lists; down 47 since FY2020.
80	Equipment Parts Sales Top agencies DLA (Defense Logistics Agency)	$8,975	<0.1%	Rank history: #62 in FY2022, #51 in FY2023, #66 in FY2024 and #77 in FY2025; up 16 since FY2020.
81	Aviation Rotables LLC Top agencies DLA (Defense Logistics Agency)	$8,860	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	CME Arma, Inc. Top agencies DLA (Defense Logistics Agency)	$8,477	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 145 since FY2020.
83	Brown Helicopter, Inc. Top agencies DLA (Defense Logistics Agency)	$8,365	<0.1%	Rank history: #82 in FY2022, #74 in FY2023, #51 in FY2024 and #27 in FY2025; up 3 since FY2020.
84	Bluedog Industries Corp Top agencies DLA (Defense Logistics Agency)	$8,256	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 30 since FY2020.
85	Usbid Incorporated Through Wbparts Inc. Top agencies DLA (Defense Logistics Agency)	$8,214	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
86	CU Enterprises Ltd Through C U Enterprises Ltd Top agencies DLA (Defense Logistics Agency)	$8,007	<0.1%	Rank history: #65 in FY2022, #72 in FY2023, #91 in FY2024 and not on the FY2025 list; up 18 since FY2020.
87	Secure Components, LLC Top agencies DLA (Defense Logistics Agency)	$7,961	<0.1%	Rank history: not on the FY2022–FY2024 lists and #24 in FY2025; down 18 since FY2020.
88	VC Displays, Inc. Top agencies DLA (Defense Logistics Agency)	$7,618	<0.1%	Rank history: #48 in FY2022, #55 in FY2023, #77 in FY2024 and #42 in FY2025; down 15 since FY2020.
89	FDH Defense Aftermarket, LLC Top agencies DLA (Defense Logistics Agency)	$7,445	<0.1%	Rank history: #71 in FY2022, #61 in FY2023, #34 in FY2024 and #78 in FY2025; up 2 since FY2020.
90	Component Central, Inc. Top agencies DLA (Defense Logistics Agency)	$7,184	<0.1%	Rank history: not on the FY2022–FY2023 lists, #83 in FY2024 and not on the FY2025 list; up 35 since FY2020.
91	Huntington Valley Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$7,027	<0.1%	Rank history: not on the FY2022 list, #91 in FY2023 and not on the FY2024–FY2025 lists; up 62 since FY2020.
92	Liberty Supply LLC Top agencies DLA (Defense Logistics Agency)	$6,791	<0.1%	Rank history: #45 in FY2022, #47 in FY2023, #65 in FY2024 and not on the FY2025 list; down 16 since FY2020.
93	SZY Holdings, LLC Top agencies DLA (Defense Logistics Agency)	$6,679	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 49 since FY2020.
94	Dixie Air Parts Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$6,432	<0.1%	Rank history: #79 in FY2022, #63 in FY2023, #73 in FY2024 and #95 in FY2025; down 1 since FY2020.
95	US Milpack & Manufacturing Corp Top agencies DLA (Defense Logistics Agency)	$6,000	<0.1%	Rank history: not on the FY2022 list, #83 in FY2023, #29 in FY2024 and #35 in FY2025; new, not ranked in FY2020.
96	DLA Aerospace LLC Top agencies DLA (Defense Logistics Agency)	$5,585	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$5,548	<0.1%	Rank history: not on the FY2022 list, #73 in FY2023, #64 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
98	Western Aero Services Inc. Top agencies DLA (Defense Logistics Agency)	$5,213	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
99	PCX Inc. Top agencies DLA (Defense Logistics Agency)	$5,068	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Pride Electronics Inc. Top agencies DLA (Defense Logistics Agency)	$5,059	<0.1%	Rank history: #94 in FY2022, #76 in FY2023, #62 in FY2024 and not on the FY2025 list; down 17 since FY2020.

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100 of 218 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 $32 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 5320 contractors in FY2021?

1. Science Applications International Corporation ($13.1M), 2. The Boeing Company ($4.54M), 3. Peerless Aerospace, LLC ($1.95M), 4. Rapid Rivet and Fastener Corporation ($1.19M), 5. Wesco Aircraft Hardware Corp. ($1.07M), 6. Adept Fasteners Inc. ($1.03M), 7. Lockheed Martin Corporation ($842K), 8. Don Industrial Group LLC ($613K), 9. Allfast Fastening Systems LLC ($537K), 10. Defense Support Services, Inc. ($462K).

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