Top 100 Contractors in PSC 6605: Navigational Instruments, FY2021

Name: Top 100 Contractors in PSC 6605: Navigational Instruments, FY2021
Creator: GovTribe

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

The top 10 won 86% of FY2021 PSC 6605 contract dollars

Contract obligations: $387,490,324 Net of deobligations, by contracts coded PSC 6605
Contractors: 223 Parent companies with an obligation
Largest contractor: RTX Corporation $90.6 million, 22.6% 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 Raytheon Company, Rockwell Collins, Inc. and Cloud Cap Technology, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOT (Department of Transportation)	$90,645,890	22.6%	Rank history: #1 in FY2022, #1 in FY2023, #3 in FY2024 and #4 in FY2025; up 2 since FY2020.
2	Northrop Grumman Corporation 6 awardees, including Northrop Grumman Systems Corporation and Northrop Grumman Italia S.p.a Top agencies Navy (Department of the Navy) Army (Department of the Army) DHS (Department of Homeland Security)	$55,943,719	14.0%	Rank history: #5 in FY2022, #5 in FY2023, #7 in FY2024 and #5 in FY2025; unchanged since FY2020.
3	Flir Systems Inc. Through Teledyne Flir Unmanned Ground Systems, Inc. Top agencies Army (Department of the Army)	$53,380,640	13.3%	Rank history: #9 in FY2022, #7 in FY2023, #32 in FY2024 and not on the FY2025 list; up 3 since FY2020.
4	Honeywell International Inc. 5 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army) DLA (Defense Logistics Agency)	$48,576,381	12.1%	Rank history: #2 in FY2022, #2 in FY2023, #1 in FY2024 and #1 in FY2025; down 3 since FY2020.
5	Raytheon Company Top agencies USAF (Department of the Air Force)	$32,970,000	8.2%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
6	L3Harris Technologies, Inc. 4 awardees, including L3Harris Interstate Electronics Corporation and L3 Technologies, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$31,743,060	7.9%	Rank history: #4 in FY2022, #4 in FY2023, #5 in FY2024 and #3 in FY2025; up 2 since FY2020.
7	BAE Systems PLC 4 awardees, including BAE Systems Information and Electronic Systems Integration Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$12,951,801	3.2%	Rank history: #3 in FY2022, #3 in FY2023, #6 in FY2024 and not on the FY2025 list; up 16 since FY2020.
8	L3Harris Interstate Electronics Corporation Top agencies USAF (Department of the Air Force)	$7,524,022	1.9%	Rank history: #7 in FY2022 and not on the FY2023–FY2025 lists; up 22 since FY2020.
9	Applied Systems Engineering Incorporated Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$6,293,503	1.6%	Rank history: #12 in FY2022, #19 in FY2023, #12 in FY2024 and #19 in FY2025; down 2 since FY2020.
10	Mayflower Communications Company, Inc. Top agencies Army (Department of the Army)	$6,202,433	1.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
11	Qualcomm Technologies Inc. Top agencies Army (Department of the Army)	$5,499,056	1.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
12	The Bionetics Corp Top agencies DOT (Department of Transportation)	$5,222,842	1.3%	Rank history: #10 in FY2022, #9 in FY2023, #11 in FY2024 and #9 in FY2025; up 2 since FY2020.
13	Leonardo S.p.A. Through Leonardo US Cyber and Security Solutions, LLC Top agencies DOT (Department of Transportation) USAF (Department of the Air Force)	$3,684,205	0.9%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
14	Kinetx, LLC Top agencies NASA (National Aeronautics and Space Administration)	$1,987,494	0.5%	Rank history: #14 in FY2022, #14 in FY2023, #19 in FY2024 and #10 in FY2025; up 4 since FY2020.
15	Orolia USA Inc. Through Talen-X, Inc. Top agencies USAF (Department of the Air Force)	$1,788,010	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	Vectors, Inc. Top agencies DOI (Department of the Interior)	$1,723,946	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
17	Geodesicx, Inc. Top agencies Navy (Department of the Navy)	$1,431,788	0.4%	Rank history: not on the FY2022 list, #21 in FY2023, #17 in FY2024 and not on the FY2025 list; unchanged since FY2020.
18	Amphenol Corporation Through Charles Industries, LLC Top agencies DOT (Department of Transportation)	$1,203,899	0.3%	Rank history: not on the FY2022–FY2025 lists; up 130 since FY2020.
19	Teledyne Technologies Incorporated 4 awardees, including Teledyne Flir Unmanned Ground Systems, Inc., Teledyne Reson Inc. and Teledyne Instruments, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) Commerce (Department of Commerce)	$1,078,371	0.3%	Rank history: #28 in FY2022, not on the FY2023 list, #22 in FY2024 and not on the FY2025 list; up 31 since FY2020.
20	Cammenga & Associates LLC Top agencies DLA (Defense Logistics Agency)	$1,019,434	0.3%	Rank history: #22 in FY2022, #8 in FY2023, not on the FY2024 list and #54 in FY2025; down 10 since FY2020.
21	Gyro Systems Co Inc. Top agencies DHS (Department of Homeland Security)	$738,690	0.2%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
22	Trimble Inc. 2 awardees Top agencies USDA (Department of Agriculture) DOI (Department of the Interior) Army (Department of the Army)	$689,070	0.2%	Rank history: #20 in FY2022, #27 in FY2023, #31 in FY2024 and #12 in FY2025; up 10 since FY2020.
23	Northrop Grumman Systems Corporation 2 awardees Top agencies Navy (Department of the Navy)	$630,213	0.2%	Rank history: not on the FY2022–FY2023 lists, #4 in FY2024 and not on the FY2025 list; down 4 since FY2020.
24	Creative Map Corporation Top agencies DHS (Department of Homeland Security)	$620,880	0.2%	Rank history: #24 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
25	BAE Systems Information and Electronic Systems Integration Inc. Top agencies USAF (Department of the Air Force)	$551,185	0.1%	Rank history: #6 in FY2022, not on the FY2023 list, #2 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
26	Duncan-Parnell Inc. Top agencies VA (Department of Veterans Affairs)	$530,855	0.1%	Rank history: #83 in FY2022, not on the FY2023–FY2024 lists and #94 in FY2025; down 5 since FY2020.
27	Outland Technology Inc. Top agencies Navy (Department of the Navy)	$499,992	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Thales 2 awardees, including Thales Usa, Inc. and Thales Avionics, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$491,448	0.1%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
29	Vector Controls Inc. Top agencies DHS (Department of Homeland Security)	$401,668	0.1%	Rank history: #31 in FY2022, #30 in FY2023, #81 in FY2024 and not on the FY2025 list; down 2 since FY2020.
30	The Boeing Company 4 awardees, including Jeppesen Foreflight, Inc. and Liquid Robotics, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Commerce (Department of Commerce)	$400,943	0.1%	Rank history: #26 in FY2022, #11 in FY2023, #52 in FY2024 and #72 in FY2025; up 69 since FY2020.
31	Ontic Engineering & Manufacturing, Inc. Through Firstmark Aerospace Corp Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$324,513	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
32	Theodor Wille Intertrade GMBH Through Atlantic Diving Supply, Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$291,574	0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
33	KVH Industries Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$287,940	0.1%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; up 26 since FY2020.
34	Vaisala OYJ Through Vaisala Inc. Top agencies Navy (Department of the Navy) DOT (Department of Transportation)	$285,171	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	C Speed LLC Top agencies DOT (Department of Transportation)	$284,128	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Aevex Aerospace, LLC Through Geodetics, Inc. Top agencies Navy (Department of the Navy)	$283,500	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	Valkyrie Enterprises, LLC Top agencies DHS (Department of Homeland Security)	$279,143	0.1%	Rank history: not on the FY2022 list, #90 in FY2023, not on the FY2024 list and #46 in FY2025; up 20 since FY2020.
38	Navigation Electronics, Inc. Top agencies USDA (Department of Agriculture)	$271,823	0.1%	Rank history: not on the FY2022–FY2024 lists and #99 in FY2025; down 4 since FY2020.
39	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency)	$268,596	0.1%	Rank history: #64 in FY2022, #67 in FY2023, not on the FY2024 list and #57 in FY2025; up 65 since FY2020.
40	IXCORE Through Exail Defense Systems, Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$261,741	0.1%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
41	Beier Radio, L.L.C. Top agencies Commerce (Department of Commerce)	$256,000	0.1%	Rank history: not on the FY2022 list, #26 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
42	The Dewey Electronics Corporation Top agencies Navy (Department of the Navy)	$253,432	0.1%	Rank history: #17 in FY2022, #20 in FY2023, #16 in FY2024 and #13 in FY2025; down 17 since FY2020.
43	High TECH Inc. Top agencies Navy (Department of the Navy)	$236,200	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	Rosenthal, Brock Top agencies Navy (Department of the Navy)	$235,200	0.1%	Rank history: not on the FY2022–FY2025 lists; up 48 since FY2020.
45	Barney A Cagle Top agencies DHS (Department of Homeland Security)	$230,200	0.1%	Rank history: not on the FY2022 list, #87 in FY2023, #88 in FY2024 and not on the FY2025 list; up 80 since FY2020.
46	Atlas Instrument Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$229,875	0.1%	Rank history: #84 in FY2022, #73 in FY2023, #57 in FY2024 and #52 in FY2025; up 110 since FY2020.
47	General Dynamics Satcom Technologies Inc. Through CPI Satcom & Antenna Technologies Inc. Top agencies DLA (Defense Logistics Agency)	$222,722	0.1%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
48	Savit Corporation Top agencies Army (Department of the Army)	$218,169	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	BAE Systems Land & Armaments L.P. 2 awardees, including BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy)	$210,866	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Donatini, Inc. Top agencies DHS (Department of Homeland Security) Commerce (Department of Commerce) DLA (Defense Logistics Agency)	$203,861	0.1%	Rank history: #47 in FY2022, #60 in FY2023, #49 in FY2024 and #34 in FY2025; up 104 since FY2020.
51	Heico Aerospace Corporat Through Radiant Power Corp Top agencies DLA (Defense Logistics Agency)	$202,500	0.1%	Rank history: #79 in FY2022, #39 in FY2023, #23 in FY2024 and #20 in FY2025; up 87 since FY2020.
52	Gtaa LLC Top agencies DLA (Defense Logistics Agency)	$198,584	<0.1%	Rank history: #27 in FY2022, #66 in FY2023, #69 in FY2024 and #37 in FY2025; up 23 since FY2020.
53	Dresser-Argus, Inc. Top agencies DLA (Defense Logistics Agency)	$158,008	<0.1%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
54	Continental Tide Defense Systems, Inc. Top agencies Navy (Department of the Navy)	$157,356	<0.1%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
55	Spirent Communications PLC Through Spirent Federal Systems Inc. Top agencies USAF (Department of the Air Force)	$149,000	<0.1%	Rank history: not on the FY2022 list, #24 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
56	Mackay Communications, Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$145,412	<0.1%	Rank history: not on the FY2022–FY2023 lists, #82 in FY2024 and #47 in FY2025; new, not ranked in FY2020.
57	Aantilia LLC Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$142,082	<0.1%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
58	Safran Defense & Space, Inc. Top agencies DHS (Department of Homeland Security)	$137,710	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
59	Qual-TEC Management Corp Through Carp Industries Corp Top agencies DLA (Defense Logistics Agency)	$135,908	<0.1%	Rank history: #43 in FY2022, #31 in FY2023, #99 in FY2024 and not on the FY2025 list; up 76 since FY2020.
60	Vectronic Aerospace Inc. Top agencies USDA (Department of Agriculture)	$131,823	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Ahlers Aerospace, Inc. Through Executive Instruments, Inc. Top agencies DLA (Defense Logistics Agency)	$120,774	<0.1%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; up 53 since FY2020.
62	Nagano Keiki Co. Ltd. Through Ashcroft Inc. Top agencies Navy (Department of the Navy)	$120,135	<0.1%	Rank history: #87 in FY2022, #57 in FY2023, not on the FY2024 list and #14 in FY2025; up 9 since FY2020.
63	Worthington Products, LLC Top agencies Army (Department of the Army)	$119,159	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$113,655	<0.1%	Rank history: #89 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
65	Wideband Systems Inc. Top agencies USAF (Department of the Air Force)	$109,750	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Edgeone LLC Top agencies Navy (Department of the Navy) Commerce (Department of Commerce)	$108,570	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
67	Integrated Security Solutions Inc. Top agencies DHS (Department of Homeland Security)	$107,800	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 41 since FY2020.
68	Allied Defense Industries Inc. Through Aero International, LLC Top agencies DLA (Defense Logistics Agency)	$106,253	<0.1%	Rank history: #33 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
69	Everbridge, Inc. Top agencies HHS (Department of Health and Human Services)	$104,000	<0.1%	Rank history: #66 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
70	Seiler Instrument and Manufacturing Company, Incorporated Top agencies Army (Department of the Army)	$96,837	<0.1%	Rank history: not on the FY2022 list, #33 in FY2023 and not on the FY2024–FY2025 lists; down 41 since FY2020.
71	Newton Research Labs, Inc. Top agencies Navy (Department of the Navy)	$90,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Lockheed Martin Corporation 3 awardees, including Sikorsky Aircraft Corporation Top agencies DLA (Defense Logistics Agency)	$89,873	<0.1%	Rank history: #18 in FY2022, #6 in FY2023, #25 in FY2024 and #18 in FY2025; down 25 since FY2020.
73	Elbit Systems Ltd Through Elbitamerica, Inc. Top agencies Navy (Department of the Navy)	$89,699	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Moog Inc. Top agencies DLA (Defense Logistics Agency)	$88,800	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Sigma TECH Enterprises, Inc. Top agencies DLA (Defense Logistics Agency)	$88,437	<0.1%	Rank history: #69 in FY2022, #96 in FY2023, #62 in FY2024 and #44 in FY2025; up 7 since FY2020.
76	Seahorse Geomatics, Incorporated Top agencies Army (Department of the Army)	$88,225	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
77	Intific Inc Through Cubic Defense Applications, Inc. Top agencies Navy (Department of the Navy)	$85,598	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Myhre's Exploration Products, Inc. Top agencies DLA (Defense Logistics Agency)	$83,177	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 79 since FY2020.
79	Tel-Instrument Electronics Corp Top agencies Navy (Department of the Navy)	$81,800	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Woodward Governor Company Through Woodward, Inc. Top agencies DLA (Defense Logistics Agency)	$77,823	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 65 since FY2020.
81	Warfighter Focused Logistics Inc. Top agencies DLA (Defense Logistics Agency)	$77,160	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 50 since FY2020.
82	Stealth Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$71,989	<0.1%	Rank history: not on the FY2022–FY2023 lists, #53 in FY2024 and #36 in FY2025; up 45 since FY2020.
83	Intergraph Corporation Through Leica Geosystems Inc. Top agencies DOI (Department of the Interior)	$71,213	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	SAFRAN Through Safran Defense & Space, Inc. Top agencies DHS (Department of Homeland Security)	$68,885	<0.1%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; down 29 since FY2020.
85	Offshore Service Vessels, L.L.C. Through International Marine Systems, L.l.c Top agencies DHS (Department of Homeland Security)	$65,795	<0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 18 since FY2020.
86	H C Merchandisers, Inc. Top agencies DLA (Defense Logistics Agency)	$63,835	<0.1%	Rank history: #23 in FY2022, not on the FY2023–FY2024 lists and #29 in FY2025; new, not ranked in FY2020.
87	Ruta Supplies Inc. Top agencies DLA (Defense Logistics Agency)	$63,000	<0.1%	Rank history: #21 in FY2022, #16 in FY2023, #15 in FY2024 and #21 in FY2025; down 52 since FY2020.
88	Dutch Valley Supply Co. Top agencies DLA (Defense Logistics Agency)	$62,376	<0.1%	Rank history: #78 in FY2022, #70 in FY2023, #72 in FY2024 and #70 in FY2025; up 67 since FY2020.
89	H.l. Dalis, Inc. Top agencies USDA (Department of Agriculture)	$61,611	<0.1%	Rank history: not on the FY2022 list, #46 in FY2023, #34 in FY2024 and #88 in FY2025; down 9 since FY2020.
90	Olympus America Inc Top agencies USAF (Department of the Air Force)	$59,186	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Headwall Photonics Inc. Top agencies USDA (Department of Agriculture)	$59,091	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Caron East, Inc. Top agencies GSA (General Services Administration) Commerce (Department of Commerce)	$58,324	<0.1%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; down 68 since FY2020.
93	Subsea Technologies, Inc. Top agencies Navy (Department of the Navy)	$57,550	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Ah Systems Inc. Top agencies DOJ (Department of Justice)	$54,040	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	MLO Aviator Products Top agencies DLA (Defense Logistics Agency)	$50,993	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
96	Sealite Usa, LLC Top agencies DHS (Department of Homeland Security)	$50,384	<0.1%	Rank history: not on the FY2022 list, #68 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
97	Sonardyne Group Ltd Through Sonardyne, Inc. Top agencies Navy (Department of the Navy)	$50,287	<0.1%	Rank history: not on the FY2022 list, #74 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
98	Rockwell Collins-ESA Vision Systems Limited Liability Compan Through Collins Elbit Vision Systems, LLC Top agencies USAF (Department of the Air Force)	$46,003	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Logos Imaging LLC Top agencies DHS (Department of Homeland Security)	$43,912	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Riegl Usa, Inc. Top agencies Army (Department of the Army)	$43,393	<0.1%	Rank history: #91 in FY2022, not on the FY2023–FY2024 lists and #93 in FY2025; new, not ranked in FY2020.

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100 of 223 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 $400 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 6605 contractors in FY2021?

1. RTX Corporation ($90.6M), 2. Northrop Grumman Corporation ($55.9M), 3. Flir Systems Inc. ($53.4M), 4. Honeywell International Inc. ($48.6M), 5. Raytheon Company ($33M), 6. L3Harris Technologies, Inc. ($31.7M), 7. BAE Systems PLC ($13M), 8. L3Harris Interstate Electronics Corporation ($7.52M), 9. Applied Systems Engineering Incorporated ($6.29M), 10. Mayflower Communications Company, Inc. ($6.2M).

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