Top 100 Contractors in PSC 5845: Underwater Sound Equipment, FY2021

Name: Top 100 Contractors in PSC 5845: Underwater Sound Equipment, FY2021
Creator: GovTribe

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

The top 10 won 91% of FY2021 PSC 5845 contract dollars

Contract obligations: $569,862,351 Net of deobligations, by contracts coded PSC 5845
Contractors: 113 Parent companies with an obligation
Largest contractor: Erapsco $291 million, 50.6% 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	Erapsco Top agencies Navy (Department of the Navy)	$290,907,198	50.6%	Rank history: #1 in FY2022, #1 in FY2023, #44 in FY2024 and not on the FY2025 list; unchanged since FY2020.
2	Lockheed Martin Corporation 6 awardees, including Sikorsky Aircraft Corporation Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$71,367,992	12.4%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and #5 in FY2025; up 1 since FY2020.
3	L3Harris Technologies, Inc. 9 awardees, including L-3 Chesapeake Sciences Corporation, L-3 Communications Maripro, Inc. and L3 Technologies, Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior) DLA (Defense Logistics Agency)	$54,029,338	9.4%	Rank history: #2 in FY2022, #2 in FY2023, #12 in FY2024 and #2 in FY2025; up 2 since FY2020.
4	Leidos Holdings, Inc. 3 awardees, including Leidos, Inc. Top agencies Navy (Department of the Navy)	$33,418,194	5.8%	Rank history: #7 in FY2022, #6 in FY2023, #10 in FY2024 and #9 in FY2025; up 2 since FY2020.
5	Ultra Electronics Forensic Technology Inc 2 awardees, including Ultra Electronics Ocean Systems Inc. and Undersea Sensor Systems Inc. Top agencies Navy (Department of the Navy)	$22,164,881	3.9%	Rank history: #6 in FY2022, #4 in FY2023, #5 in FY2024 and #30 in FY2025; up 2 since FY2020.
6	RTX Corporation 6 awardees, including Raytheon Company, Goodrich Corporation and Rockwell Collins, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DLA (Defense Logistics Agency)	$16,703,420	2.9%	Rank history: #12 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
7	Kongsberg Gruppen ASA 2 awardees, including Kongsberg Discovery US, LLC and Kongsberg Maritime Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$12,016,146	2.1%	Rank history: #13 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
8	Sedna Digital Solutions, LLC Top agencies Navy (Department of the Navy)	$8,526,447	1.5%	Rank history: #8 in FY2022, #5 in FY2023, #7 in FY2024 and #6 in FY2025; up 3 since FY2020.
9	Government of Canada Through Canadian Commercial Corporation Top agencies Navy (Department of the Navy)	$7,795,754	1.4%	Rank history: not on the FY2022 list, #7 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
10	General Dynamics Mission Systems, Inc. Top agencies Navy (Department of the Navy)	$6,969,068	1.2%	Rank history: #11 in FY2022, #17 in FY2023, #20 in FY2024 and not on the FY2025 list; up 14 since FY2020.
11	Massa Products Corporation Top agencies Navy (Department of the Navy)	$6,900,779	1.2%	Rank history: #9 in FY2022, #10 in FY2023, #9 in FY2024 and #11 in FY2025; down 1 since FY2020.
12	Huntington Ingalls Industries, Inc. Through Huntington Ingalls Inc. Top agencies Navy (Department of the Navy)	$5,784,920	1.0%	Rank history: #4 in FY2022, #9 in FY2023, #8 in FY2024 and #4 in FY2025; new, not ranked in FY2020.
13	Syqwest LLC Top agencies Navy (Department of the Navy)	$3,703,160	0.6%	Rank history: #10 in FY2022, #11 in FY2023, #13 in FY2024 and #10 in FY2025; up 4 since FY2020.
14	Thales 2 awardees, including Thales Defense & Security Inc. and Thales Australia Limited Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$3,479,681	0.6%	Rank history: #14 in FY2022, #8 in FY2023, #40 in FY2024 and #19 in FY2025; down 12 since FY2020.
15	Northrop Grumman Corporation Through Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy)	$2,733,982	0.5%	Rank history: #18 in FY2022, #22 in FY2023, #14 in FY2024 and #8 in FY2025; down 3 since FY2020.
16	Leidos, Inc. Top agencies Navy (Department of the Navy)	$1,698,262	0.3%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
17	HII Unmanned Systems, Inc. Top agencies Navy (Department of the Navy)	$1,554,344	0.3%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
18	Advanced Telemetry Systems Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$1,395,124	0.2%	Rank history: #50 in FY2022, #23 in FY2023, #26 in FY2024 and #25 in FY2025; new, not ranked in FY2020.
19	Esco Technologies Inc. 2 awardees, including Globe Composite Solutions, LLC and Westland Technologies, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,353,915	0.2%	Rank history: #19 in FY2022, #27 in FY2023, #16 in FY2024 and #26 in FY2025; up 7 since FY2020.
20	Teledyne Technologies Incorporated 4 awardees, including Teledyne Instruments, Inc. Top agencies Navy (Department of the Navy)	$1,317,783	0.2%	Rank history: #17 in FY2022, #18 in FY2023, #18 in FY2024 and not on the FY2025 list; down 5 since FY2020.
21	Heico Aerospace Corporat Through Seal Dynamics LLC Top agencies DLA (Defense Logistics Agency)	$1,229,958	0.2%	Rank history: #16 in FY2022, #19 in FY2023, #23 in FY2024 and #18 in FY2025; unchanged since FY2020.
22	Oceanworks International Inc. Through Hydroacoustics Incorporated Top agencies Navy (Department of the Navy)	$1,086,600	0.2%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
23	Hti-Vemco USA Inc. Top agencies DOI (Department of the Interior)	$990,644	0.2%	Rank history: #28 in FY2022, #42 in FY2023, #64 in FY2024 and not on the FY2025 list; up 8 since FY2020.
24	Leonardo S.p.A. Through Laurel Technologies Partnership Top agencies Navy (Department of the Navy)	$981,635	0.2%	Rank history: #5 in FY2022, #13 in FY2023, #19 in FY2024 and #43 in FY2025; new, not ranked in FY2020.
25	Sonardyne, Inc. Top agencies Navy (Department of the Navy)	$926,762	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	BAE Systems PLC Through BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy)	$880,166	0.2%	Rank history: #22 in FY2022, #21 in FY2023, #24 in FY2024 and #44 in FY2025; up 1 since FY2020.
27	Metocean Telematics, Inc. Top agencies DHS (Department of Homeland Security)	$850,500	0.1%	Rank history: #15 in FY2022, #24 in FY2023, #38 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
28	Maritime Surveillance Associates Inc. Top agencies Navy (Department of the Navy)	$632,184	0.1%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
29	Allard Nazarian Group, Inc. Top agencies Navy (Department of the Navy)	$587,763	0.1%	Rank history: not on the FY2022–FY2023 lists, #79 in FY2024 and not on the FY2025 list; up 4 since FY2020.
30	The Boeing Company 3 awardees, including Argon ST, Inc. Top agencies Navy (Department of the Navy)	$586,726	0.1%	Rank history: #34 in FY2022, #63 in FY2023, #11 in FY2024 and #22 in FY2025; up 8 since FY2020.
31	State of California Controllers Office Through University of California San Diego Top agencies Navy (Department of the Navy)	$486,055	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Seahorse Geomatics, Incorporated Top agencies DOI (Department of the Interior)	$462,745	0.1%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
33	Northwest Marine Technology, Inc. Top agencies DOI (Department of the Interior)	$344,534	0.1%	Rank history: #25 in FY2022, #15 in FY2023, #97 in FY2024 and not on the FY2025 list; down 5 since FY2020.
34	Gavial Holdings, Inc. Through Gavial Itc, LLC Top agencies Navy (Department of the Navy)	$330,816	0.1%	Rank history: #80 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2020.
35	TE Connectivity Corporation Through Brantner and Associates, Inc. Top agencies Navy (Department of the Navy)	$320,131	0.1%	Rank history: #46 in FY2022, #30 in FY2023, #27 in FY2024 and not on the FY2025 list; up 55 since FY2020.
36	Innovasea Marine Systems Canada Inc Top agencies DOI (Department of the Interior) Navy (Department of the Navy)	$305,591	0.1%	Rank history: #29 in FY2022, #36 in FY2023, #36 in FY2024 and #32 in FY2025; new, not ranked in FY2020.
37	W S Darley & Co Top agencies DOJ (Department of Justice)	$286,727	<0.1%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
38	Enjet Aero, LLC Through Enjet Aero Terre Haute LLC Top agencies Navy (Department of the Navy)	$272,892	<0.1%	Rank history: #36 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
39	Thales Defense & Security Inc. Top agencies Navy (Department of the Navy)	$251,136	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
40	Teledyne Instruments Inc. Top agencies Navy (Department of the Navy)	$245,603	<0.1%	Rank history: not on the FY2022–FY2024 lists and #13 in FY2025; new, not ranked in FY2020.
41	Donatini, Inc. Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$240,246	<0.1%	Rank history: #40 in FY2022, not on the FY2023–FY2024 lists and #77 in FY2025; up 26 since FY2020.
42	FBC Enterprises LLC Top agencies DLA (Defense Logistics Agency)	$233,693	<0.1%	Rank history: not on the FY2022 list, #45 in FY2023, #25 in FY2024 and #49 in FY2025; down 17 since FY2020.
43	Integrated Procurement Technologies Top agencies Navy (Department of the Navy)	$230,400	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	L-3 Communications Maripro, Inc. Top agencies Navy (Department of the Navy)	$212,702	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 36 since FY2020.
45	Mikel, Inc. Top agencies Navy (Department of the Navy)	$205,636	<0.1%	Rank history: not on the FY2022 list, #28 in FY2023, #34 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
46	Undersea Systems International, Inc. Top agencies Navy (Department of the Navy) USSOCOM (United States Special Operations Command)	$189,317	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy)	$183,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
48	Ducommun Labarge Technologies, Inc. Top agencies Navy (Department of the Navy)	$178,028	<0.1%	Rank history: not on the FY2022–FY2023 lists, #55 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
49	Seafloor Systems, Inc. Top agencies DOI (Department of the Interior)	$162,443	<0.1%	Rank history: #61 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
50	Thyssenkrupp Elevator Corporation Through Tkms Atlas North America LLC Top agencies DHS (Department of Homeland Security)	$159,411	<0.1%	Rank history: #27 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
51	High TECH Inc. Top agencies Navy (Department of the Navy)	$146,800	<0.1%	Rank history: #77 in FY2022, #49 in FY2023, #63 in FY2024 and not on the FY2025 list; up 20 since FY2020.
52	New Directions Technologies, Inc. Top agencies Navy (Department of the Navy)	$135,000	<0.1%	Rank history: #20 in FY2022, not on the FY2023 list, #37 in FY2024 and #37 in FY2025; new, not ranked in FY2020.
53	Danaher Corporation Through Sea-Bird Electronics, Inc. Top agencies Navy (Department of the Navy)	$115,000	<0.1%	Rank history: not on the FY2022 list, #37 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
54	Ruta Supplies Inc. Top agencies DLA (Defense Logistics Agency)	$113,920	<0.1%	Rank history: #59 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
55	Mac Aerospace Corp Top agencies Navy (Department of the Navy)	$107,838	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Barney A Cagle Top agencies Navy (Department of the Navy)	$100,875	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Management Services Group, Inc. Top agencies Navy (Department of the Navy)	$100,666	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Mercury Computer Systems Inc. Through Mercury Systems - Trusted Mission Solutions Inc. Top agencies Navy (Department of the Navy)	$95,302	<0.1%	Rank history: not on the FY2022–FY2023 lists, #76 in FY2024 and #40 in FY2025; down 12 since FY2020.
59	Ocean Instruments NZ Limited Top agencies Commerce (Department of Commerce)	$84,645	<0.1%	Rank history: not on the FY2022 list, #65 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
60	Edgeone LLC Top agencies Navy (Department of the Navy)	$75,754	<0.1%	Rank history: #33 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; down 19 since FY2020.
61	Govage, Inc. Top agencies DOI (Department of the Interior)	$74,135	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Cubic Digital Intelligence Inc. Through Cubic Defense Applications, Inc. Top agencies Navy (Department of the Navy)	$72,000	<0.1%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
63	Ideal Instrument Co, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$66,787	<0.1%	Rank history: #51 in FY2022, #56 in FY2023, not on the FY2024 list and #55 in FY2025; new, not ranked in FY2020.
64	BAE Systems Land & Armaments L.P. Through BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy)	$66,715	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Westcoast Oceanography Inc Through ASL Environmental Sciences Inc. Top agencies Commerce (Department of Commerce)	$64,360	<0.1%	Rank history: not on the FY2022–FY2023 lists, #72 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
66	Merck & Co. Inc. Through Biomark LLC Top agencies Army (Department of the Army)	$60,620	<0.1%	Rank history: #60 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
67	Idex Corporation Through Ads LLC Top agencies DOI (Department of the Interior)	$59,545	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Tkms Atlas North America LLC Top agencies DHS (Department of Homeland Security)	$53,920	<0.1%	Rank history: not on the FY2022–FY2023 lists, #31 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
69	Caterpillar Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$48,245	<0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
70	Deep Trekker Inc. Top agencies Navy (Department of the Navy)	$45,957	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
71	Par Defense Industries, LLC Top agencies DLA (Defense Logistics Agency)	$44,830	<0.1%	Rank history: #49 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
72	Oceanweather, Inc. Top agencies Army (Department of the Army)	$36,920	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Spectris PLC 2 awardees, including Bruel & Kjaer North America Inc. and Hottinger Bruel & Kjaer Inc. Top agencies DOE (Department of Energy)	$35,904	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	DC Precision LLC Top agencies DLA (Defense Logistics Agency)	$33,450	<0.1%	Rank history: not on the FY2022–FY2023 lists, #60 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
75	C and S Machine Inc. Top agencies Navy (Department of the Navy)	$31,968	<0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
76	Meggitt PLC Through Oeco, LLC Top agencies Navy (Department of the Navy)	$30,155	<0.1%	Rank history: #48 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
77	Russell' S Tube Forming Inc. Top agencies Navy (Department of the Navy)	$28,831	<0.1%	Rank history: not on the FY2022 list, #60 in FY2023, not on the FY2024 list and #59 in FY2025; new, not ranked in FY2020.
78	Trimble Inc. Through Applanix Corp Top agencies Army (Department of the Army)	$26,733	<0.1%	Rank history: #38 in FY2022, #34 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
79	MPS Manufacturing Company, LLC Top agencies Navy (Department of the Navy)	$23,940	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Intific Inc Through Cubic Defense Applications, Inc. Top agencies Navy (Department of the Navy)	$22,285	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
81	In-Situ, Inc. Top agencies Commerce (Department of Commerce)	$20,865	<0.1%	Rank history: #72 in FY2022, not on the FY2023 list, #86 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
82	Woods Hole Oceanographic Institution Top agencies Navy (Department of the Navy)	$19,665	<0.1%	Rank history: #43 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
83	Imagenex Technology Corp Top agencies DOI (Department of the Interior)	$19,597	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
84	Electro Mechanical Specialists, LLC Top agencies Navy (Department of the Navy)	$19,200	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Aero Engineering & Manufacturing Company of California, LLC Top agencies DLA (Defense Logistics Agency)	$18,575	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Survey Equipment Services, Inc. Top agencies DOI (Department of the Interior)	$17,450	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Airmar Technology Corp Top agencies Commerce (Department of Commerce)	$16,600	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Senso-Metrics, Inc. Top agencies DLA (Defense Logistics Agency)	$15,800	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Regents of the University of Michigan Top agencies Commerce (Department of Commerce)	$14,935	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Comperipherals Incorporated Top agencies DLA (Defense Logistics Agency)	$13,190	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Nvision Solutions Inc. Top agencies Navy (Department of the Navy)	$12,670	<0.1%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
92	Ocean Marine Industries, Inc. Top agencies Commerce (Department of Commerce)	$11,910	<0.1%	Rank history: #53 in FY2022, not on the FY2023 list, #41 in FY2024 and #50 in FY2025; down 43 since FY2020.
93	SAI Systems International, Inc. Top agencies Navy (Department of the Navy)	$11,775	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Geodesicx, Inc. Top agencies DHS (Department of Homeland Security)	$10,243	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Theodor Wille Intertrade GMBH Through Atlantic Diving Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$9,750	<0.1%	Rank history: #30 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
96	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$9,637	<0.1%	Rank history: not on the FY2022–FY2024 lists and #93 in FY2025; new, not ranked in FY2020.
97	West Electronics Inc. Top agencies DLA (Defense Logistics Agency)	$7,088	<0.1%	Rank history: #86 in FY2022, #84 in FY2023, #84 in FY2024 and #83 in FY2025; down 3 since FY2020.
98	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$6,752	<0.1%	Rank history: not on the FY2022 list, #89 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
99	Sechan Electronics Inc. Top agencies Navy (Department of the Navy)	$6,000	<0.1%	Rank history: not on the FY2022 list, #26 in FY2023, #15 in FY2024 and #34 in FY2025; new, not ranked in FY2020.
100	Martin Military Inc. Top agencies DLA (Defense Logistics Agency)	$4,960	<0.1%	Rank history: #84 in FY2022, not on the FY2023 list, #87 in FY2024 and not on the FY2025 list; down 9 since FY2020.

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100 of 113 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 $575 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 5845 contractors in FY2021?

1. Erapsco ($291M), 2. Lockheed Martin Corporation ($71.4M), 3. L3Harris Technologies, Inc. ($54M), 4. Leidos Holdings, Inc. ($33.4M), 5. Ultra Electronics Forensic Technology Inc ($22.2M), 6. RTX Corporation ($16.7M), 7. Kongsberg Gruppen ASA ($12M), 8. Sedna Digital Solutions, LLC ($8.53M), 9. Government of Canada ($7.8M), 10. General Dynamics Mission Systems, Inc. ($6.97M).

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