Top 100 Contractors in NAICS 336415: Guided Missile and Space Vehicle Propulsion Unit and Propulsion Unit Parts Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 336415: Guided Missile and Space Vehicle Propulsion Unit and Propulsion Unit 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 98% of FY2021 NAICS 336415 contract dollars

Contract obligations: $722,064,103 Net of deobligations, by contracts coded NAICS 336415
Contractors: 206 Parent companies with an obligation
Largest contractor: Lockheed Martin Corporation $329 million, 45.2% 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	Lockheed Martin Corporation 3 awardees Top agencies Navy (Department of the Navy) Army (Department of the Army)	$329,161,669	45.2%	Rank history: #4 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Northrop Grumman Corporation 6 awardees, including ATK Launch Systems LLC, Northrop Grumman Systems Corporation and Alliant Techsystems Operations LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$201,292,128	27.6%	Rank history: #1 in FY2022, #3 in FY2023, #5 in FY2024 and #5 in FY2025; unchanged since FY2020.
3	The Boeing Company 4 awardees Top agencies NASA (National Aeronautics and Space Administration) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$144,956,073	19.9%	Rank history: #2 in FY2022, #4 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since FY2020.
4	Kratos Space & Missile Defense Systems, Inc. Top agencies Navy (Department of the Navy)	$15,698,470	2.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
5	Special Aerospace Services, LLC Through SAS Manufacturing LLC Top agencies USAF (Department of the Air Force)	$6,469,241	0.9%	Rank history: #5 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
6	SGL Carbon SE Through SGL Composites Inc. Top agencies Navy (Department of the Navy)	$3,419,912	0.5%	Rank history: not on the FY2022 list, #8 in FY2023, #7 in FY2024 and #7 in FY2025; up 4 since FY2020.
7	Moog Inc. 2 awardees Top agencies NASA (National Aeronautics and Space Administration)	$3,370,694	0.5%	Rank history: #8 in FY2022, #7 in FY2023, #21 in FY2024 and #37 in FY2025; up 25 since FY2020.
8	Aerojet Rocketdyne Holdings, Inc. 3 awardees, including Aerojet Rocketdyne, Inc. Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$3,008,562	0.4%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
9	RTX Corporation 4 awardees, including Raytheon Company Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,696,818	0.4%	Rank history: #9 in FY2022, #2 in FY2023, #6 in FY2024 and #4 in FY2025; up 25 since FY2020.
10	IBC Materials and Technologies, LLC Top agencies DLA (Defense Logistics Agency)	$1,763,986	0.2%	Rank history: #10 in FY2022, #12 in FY2023, #13 in FY2024 and #13 in FY2025; up 10 since FY2020.
11	Dutch Valley Supply Co. Top agencies DLA (Defense Logistics Agency)	$884,180	0.1%	Rank history: #18 in FY2022, #19 in FY2023, #35 in FY2024 and #12 in FY2025; up 11 since FY2020.
12	Marvin Engineering Co, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$632,028	0.1%	Rank history: #7 in FY2022, #10 in FY2023, #26 in FY2024 and #10 in FY2025; unchanged since FY2020.
13	Duramax Marine, LLC Top agencies DLA (Defense Logistics Agency)	$598,539	0.1%	Rank history: #38 in FY2022, #15 in FY2023, not on the FY2024 list and #30 in FY2025; up 41 since FY2020.
14	BAE Systems PLC Through BAE Systems Land & Armaments L.P. Top agencies DLA (Defense Logistics Agency)	$549,727	0.1%	Rank history: not on the FY2022 list, #48 in FY2023, #38 in FY2024 and #20 in FY2025; up 9 since FY2020.
15	Esco Technologies Inc. Through Vacco Industries Top agencies NASA (National Aeronautics and Space Administration)	$514,620	0.1%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
16	Taber Acquisition Corp. Top agencies NASA (National Aeronautics and Space Administration)	$503,970	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
17	March Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$424,712	0.1%	Rank history: #16 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
18	S I T Corporation Top agencies DLA (Defense Logistics Agency)	$363,690	<0.1%	Rank history: #55 in FY2022, #39 in FY2023, #31 in FY2024 and #22 in FY2025; up 28 since FY2020.
19	Burhani Enterprises Inc. Top agencies DLA (Defense Logistics Agency)	$277,839	<0.1%	Rank history: #48 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
20	Avans Machine, Inc. Top agencies DLA (Defense Logistics Agency)	$276,450	<0.1%	Rank history: #52 in FY2022, not on the FY2023 list, #54 in FY2024 and #49 in FY2025; up 41 since FY2020.
21	The Handy Tool & Mfg. Co., Inc. Top agencies DLA (Defense Logistics Agency)	$252,400	<0.1%	Rank history: #33 in FY2022, #28 in FY2023, #67 in FY2024 and #25 in FY2025; new, not ranked in FY2020.
22	A.g.h. Industries, LLC Top agencies DLA (Defense Logistics Agency)	$247,029	<0.1%	Rank history: #62 in FY2022, #99 in FY2023, #91 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
23	Bollinger Shipyards Inc Through Chand, L.L.C. Top agencies DLA (Defense Logistics Agency)	$243,635	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
24	Eilers Machine & Welding Inc. Top agencies DLA (Defense Logistics Agency)	$239,374	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
25	Science Applications International Corporation Through Asrc Federal Facilities Logistics, LLC Top agencies DLA (Defense Logistics Agency)	$219,073	<0.1%	Rank history: #42 in FY2022, #34 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
26	Hoosier Industrial Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$198,512	<0.1%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
27	Aerometals, Inc. Top agencies DLA (Defense Logistics Agency)	$195,520	<0.1%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
28	Knobley Technical Associates, LLC Top agencies Navy (Department of the Navy)	$186,791	<0.1%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
29	Williams International Co., L.L.C. Top agencies Navy (Department of the Navy)	$172,974	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
30	Middle Georgia Diversified Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$159,787	<0.1%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
31	A Wiley & Associates Inc. Top agencies DLA (Defense Logistics Agency)	$157,292	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 27 since FY2020.
32	Raytheon Company Top agencies DLA (Defense Logistics Agency)	$143,413	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	U.s.a. Spares Inc. Top agencies DLA (Defense Logistics Agency)	$141,724	<0.1%	Rank history: #30 in FY2022, #30 in FY2023, #46 in FY2024 and #53 in FY2025; up 59 since FY2020.
34	Maven Engineering Corporation Top agencies DLA (Defense Logistics Agency)	$141,178	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Freedom Precision Manufacturing LLC Top agencies DLA (Defense Logistics Agency)	$129,510	<0.1%	Rank history: not on the FY2022 list, #94 in FY2023, #56 in FY2024 and not on the FY2025 list; up 10 since FY2020.
36	Airtronics, LLC Top agencies DLA (Defense Logistics Agency)	$123,993	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	Fitzhugh Clifton Top agencies Navy (Department of the Navy)	$100,540	<0.1%	Rank history: #31 in FY2022, #37 in FY2023, #69 in FY2024 and not on the FY2025 list; up 28 since FY2020.
38	Polytech Defense Spares LLC Top agencies DLA (Defense Logistics Agency)	$96,134	<0.1%	Rank history: #95 in FY2022, not on the FY2023 list, #86 in FY2024 and #61 in FY2025; up 30 since FY2020.
39	Blankenship Enterprises of Pinellas County Inc. Top agencies DLA (Defense Logistics Agency)	$94,324	<0.1%	Rank history: not on the FY2022–FY2024 lists and #47 in FY2025; new, not ranked in FY2020.
40	PCX Inc. Top agencies DLA (Defense Logistics Agency)	$91,924	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 83 since FY2020.
41	A&B Foundry, LLC Top agencies DLA (Defense Logistics Agency)	$91,640	<0.1%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
42	Linmarr Associates, Inc. Top agencies DLA (Defense Logistics Agency)	$87,806	<0.1%	Rank history: #91 in FY2022, #68 in FY2023, not on the FY2024 list and #56 in FY2025; up 44 since FY2020.
43	GTC Machining LLC Top agencies DLA (Defense Logistics Agency)	$86,396	<0.1%	Rank history: #84 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
44	Danaher Corporation Through Pall Aeropower Corporation Top agencies DLA (Defense Logistics Agency)	$86,000	<0.1%	Rank history: #73 in FY2022, #27 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
45	Janels Industries Inc. Top agencies DLA (Defense Logistics Agency)	$85,268	<0.1%	Rank history: #47 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; up 101 since FY2020.
46	BGT Aerospace LLC Top agencies DLA (Defense Logistics Agency)	$83,860	<0.1%	Rank history: not on the FY2022–FY2023 lists, #65 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
47	Basic Rubber and Plastics Co. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$79,728	<0.1%	Rank history: #59 in FY2022, #65 in FY2023, #52 in FY2024 and not on the FY2025 list; up 2 since FY2020.
48	Associated Aircraft Manufacturing & Sales, Inc. Top agencies DLA (Defense Logistics Agency)	$77,989	<0.1%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
49	AWS Industries Inc. Top agencies DLA (Defense Logistics Agency)	$76,682	<0.1%	Rank history: #98 in FY2022, #50 in FY2023, #59 in FY2024 and not on the FY2025 list; down 2 since FY2020.
50	Commonwealth Trading Corporation Top agencies DLA (Defense Logistics Agency)	$76,129	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Plasma Processes, LLC Top agencies NASA (National Aeronautics and Space Administration)	$75,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
52	R & M Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$73,000	<0.1%	Rank history: #39 in FY2022, #35 in FY2023, #81 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
53	CNS Co LLC Top agencies DLA (Defense Logistics Agency)	$71,986	<0.1%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; up 3 since FY2020.
54	Bright Lights Usa, Inc. Top agencies DLA (Defense Logistics Agency)	$70,633	<0.1%	Rank history: not on the FY2022 list, #24 in FY2023, not on the FY2024 list and #97 in FY2025; up 50 since FY2020.
55	Aarcorp Through AAR Supply Chain, Inc. Top agencies DLA (Defense Logistics Agency)	$70,301	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Flower Holdings Corporation Top agencies Navy (Department of the Navy)	$70,195	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 121 since FY2020.
57	L.r.g. Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$68,170	<0.1%	Rank history: #41 in FY2022, not on the FY2023–FY2024 lists and #44 in FY2025; new, not ranked in FY2020.
58	Smiths Group PLC 2 awardees, including Smiths Tubular Systems-Laconia, Inc. and Smiths Interconnect, Inc. Top agencies DLA (Defense Logistics Agency)	$67,769	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
59	Axion Corporation Top agencies DLA (Defense Logistics Agency)	$64,100	<0.1%	Rank history: not on the FY2022 list, #61 in FY2023, #33 in FY2024 and #70 in FY2025; new, not ranked in FY2020.
60	Aereos, LLC Top agencies DLA (Defense Logistics Agency)	$62,980	<0.1%	Rank history: not on the FY2022–FY2023 lists, #16 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
61	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$62,949	<0.1%	Rank history: #35 in FY2022, #88 in FY2023, #23 in FY2024 and #14 in FY2025; down 44 since FY2020.
62	Teledyne Technologies Incorporated Through Teledyne Brown Engineering, Inc. Top agencies Navy (Department of the Navy)	$58,802	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Dcx-Chol Enterprises, Inc. Top agencies DLA (Defense Logistics Agency)	$58,090	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	G M J Machine Co, Inc. Top agencies DLA (Defense Logistics Agency)	$57,451	<0.1%	Rank history: not on the FY2022–FY2024 lists and #87 in FY2025; new, not ranked in FY2020.
65	Alek Industries Inc. Top agencies DLA (Defense Logistics Agency)	$57,155	<0.1%	Rank history: #80 in FY2022, #60 in FY2023, #64 in FY2024 and #62 in FY2025; up 86 since FY2020.
66	The Bionetics Corp Top agencies DLA (Defense Logistics Agency)	$54,757	<0.1%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
67	Edel Engineering Development Co. Top agencies Navy (Department of the Navy)	$48,444	<0.1%	Rank history: #29 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
68	Ruotanen Associates Inc. Top agencies DLA (Defense Logistics Agency)	$45,536	<0.1%	Rank history: not on the FY2022 list, #41 in FY2023, not on the FY2024 list and #31 in FY2025; up 10 since FY2020.
69	Millennium Aerospace and Defense Top agencies DLA (Defense Logistics Agency)	$43,719	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
70	Global Logistics Strategies Inc. Top agencies DLA (Defense Logistics Agency)	$41,779	<0.1%	Rank history: not on the FY2022–FY2023 lists, #60 in FY2024 and not on the FY2025 list; down 17 since FY2020.
71	Bradley-Thompson Tool Company Top agencies DLA (Defense Logistics Agency)	$41,250	<0.1%	Rank history: not on the FY2022–FY2023 lists, #37 in FY2024 and #43 in FY2025; up 96 since FY2020.
72	Heico Aerospace Corporat 2 awardees, including Aerospace & Commercial Technologies, LLC and Seal Dynamics LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$41,128	<0.1%	Rank history: #75 in FY2022, not on the FY2023–FY2024 lists and #89 in FY2025; up 28 since FY2020.
73	Polytronix, Inc. Top agencies DLA (Defense Logistics Agency)	$37,650	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Govparts LLC Top agencies DLA (Defense Logistics Agency)	$37,284	<0.1%	Rank history: not on the FY2022 list, #84 in FY2023, not on the FY2024 list and #73 in FY2025; down 23 since FY2020.
75	Transdigm Group Incorporated 2 awardees, including Kirkhill, Inc. Top agencies DLA (Defense Logistics Agency)	$36,641	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 61 since FY2020.
76	Freehold Manufacturing Assembly Company, Inc. Top agencies DLA (Defense Logistics Agency)	$36,170	<0.1%	Rank history: #76 in FY2022, #82 in FY2023, #79 in FY2024 and #58 in FY2025; up 33 since FY2020.
77	G.s.e. Dynamics, Inc. Top agencies DLA (Defense Logistics Agency)	$35,700	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Lektron Inc. Top agencies DLA (Defense Logistics Agency)	$35,093	<0.1%	Rank history: #3 in FY2022, #6 in FY2023, #9 in FY2024 and #6 in FY2025; new, not ranked in FY2020.
79	J & N Metal Products, LLC Top agencies DLA (Defense Logistics Agency)	$34,909	<0.1%	Rank history: #81 in FY2022, not on the FY2023–FY2024 lists and #85 in FY2025; new, not ranked in FY2020.
80	Shield Technologies Corp Top agencies DLA (Defense Logistics Agency)	$34,213	<0.1%	Rank history: #20 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
81	Projects Unlimited Inc. Top agencies DLA (Defense Logistics Agency)	$33,283	<0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 80 since FY2020.
82	Michigan CNC Tool, Inc. Top agencies DLA (Defense Logistics Agency)	$32,871	<0.1%	Rank history: #77 in FY2022, #63 in FY2023, #77 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
83	Promochrom Technologies Ltd Top agencies EPA (Environmental Protection Agency)	$32,500	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Stag Enterprise, Inc. Top agencies DLA (Defense Logistics Agency)	$32,053	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	General Dynamics Corporation Through Electric Boat Corporation Top agencies DLA (Defense Logistics Agency)	$29,048	<0.1%	Rank history: #27 in FY2022, #42 in FY2023, #36 in FY2024 and not on the FY2025 list; up 25 since FY2020.
86	Adirondack Electronics Inc. Top agencies Navy (Department of the Navy)	$28,824	<0.1%	Rank history: not on the FY2022 list, #36 in FY2023, #45 in FY2024 and #81 in FY2025; down 11 since FY2020.
87	Solo Enterprise Corp. Top agencies DLA (Defense Logistics Agency)	$28,227	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Howe Machine & Tool Corp. Top agencies DLA (Defense Logistics Agency)	$27,320	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Advanced Electro Dynamics Inc. Top agencies DLA (Defense Logistics Agency)	$27,178	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$27,121	<0.1%	Rank history: not on the FY2022 list, #51 in FY2023, #34 in FY2024 and #38 in FY2025; down 24 since FY2020.
91	General Reliance Corp Top agencies DLA (Defense Logistics Agency)	$26,068	<0.1%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; down 58 since FY2020.
92	Shiloh Industries Inc. Top agencies DLA (Defense Logistics Agency)	$25,796	<0.1%	Rank history: not on the FY2022–FY2024 lists and #79 in FY2025; down 7 since FY2020.
93	Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$24,882	<0.1%	Rank history: #71 in FY2022, #44 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
94	Regal Air, Inc. Top agencies DLA (Defense Logistics Agency)	$24,570	<0.1%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 72 since FY2020.
95	Mccay Tool and Engineering Company Top agencies DLA (Defense Logistics Agency)	$24,561	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Larkos Packing and Distribution Inc. Top agencies DLA (Defense Logistics Agency)	$23,870	<0.1%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; up 77 since FY2020.
97	CEN TEX Defense Industries LLC Top agencies DLA (Defense Logistics Agency)	$22,960	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Alamo Aircraft Supply Inc. Through Alamo Aircraft, Ltd. Top agencies DLA (Defense Logistics Agency)	$22,862	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
99	Empire Avionics Corp. Top agencies DLA (Defense Logistics Agency)	$22,600	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 25 since FY2020.
100	Coordinated Defense Supply Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$21,845	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 206 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 $729 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 336415 contractors in FY2021?

1. Lockheed Martin Corporation ($329M), 2. Northrop Grumman Corporation ($201M), 3. The Boeing Company ($145M), 4. Kratos Space & Missile Defense Systems, Inc. ($15.7M), 5. Special Aerospace Services, LLC ($6.47M), 6. SGL Carbon SE ($3.42M), 7. Moog Inc. ($3.37M), 8. Aerojet Rocketdyne Holdings, Inc. ($3.01M), 9. RTX Corporation ($2.7M), 10. IBC Materials and Technologies, LLC ($1.76M).

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