Ultra Electronics
A British defence and security electronics company supplying aerospace, maritime, communications, cyber, and mission systems.
Last updated October 14, 2026
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Overview
Ultra Electronics is a British defence and security electronics company whose activities have developed from consumer audio and radio equipment into specialised systems for aerospace, maritime defence, secure communications, cyber operations, and mission-critical applications. The business began in 1920 as Edward E. Rosen & Co., founded by wireless specialist Teddy Rosen to manufacture headphones and loudspeakers. The Ultra name was adopted commercially during the 1920s, and the company broadened its portfolio into domestic radios, television receivers, aircraft components, and electronic control systems. During the 1930s, Ultra produced a range of household radio receivers and supplied components to the aviation industry. The Second World War marked a major change in the company's industrial profile. Ultra manufactured aerostructures and aircraft components, including tails and bomb doors for the Short Stirling bomber, and subsequently supplied equipment for a variety of aircraft. After the war, it maintained an aviation and military presence while returning to civilian markets. Its post-war engineering work included temperature regulators, fuel-flow valves, throttle controls, and other systems used in aircraft engines and propulsion platforms. Ultra entered television manufacturing in 1953 and acquired Pilot Radio & Television in 1959. In 1961, its consumer-electronics interests were transferred to Thorn Electrical Industries, leaving the continuing business focused more heavily on industrial, aerospace, and defence electronics. Among the products associated with this period were Jezebel and Mini-Jezebel sonobuoys, while the company also developed the SARAH search-and-rescue and homing radio beacon. Ultra technologies were incorporated into several Concorde subsystems, including droop-nose controls and engine-control systems. The company was acquired by the Dowty Group in 1977 and operated within Dowty's electronics division. Its capabilities expanded in maritime systems, stealth-related engineering, anti-submarine programmes, and aerospace electronics. A management buyout in 1993 restored Ultra Electronics as an independent company. It floated on the London Stock Exchange in 1996 and then pursued a broad acquisition strategy, adding businesses in communications, aerospace electronics, cyber-security, fuel-cell technology, forensic identification, electronic warfare, and radio-frequency systems. Its products included active noise-control and vibration-damping technologies marketed for aircraft cabins, with adoption by aerospace manufacturers including Bombardier Aerospace and Airbus. The acquisition-led model increased the company's geographical reach, particularly in the United States, but also created a decentralised and complex operating structure. In 2017, a profit warning led to a sharp share-price decline and the resignation of chief executive Rakesh Sharma. Reporting at the time identified acquisition quality, delayed or cancelled defence spending, revenue-recognition concerns, and underinvestment as contributing issues. In 2018, the Serious Fraud Office opened an investigation into suspected corruption at the company. A subsequent management programme described as “focus, fix and grow” concentrated investment on core underwater-defence capabilities and expansion in the US market. Cobham agreed to acquire Ultra Electronics in 2021 for approximately £2.6 billion. Because Ultra was a significant UK defence contractor and Cobham was owned by the US-based investment firm Advent International, the transaction underwent a UK national-security review. The UK government approved it in 2022 subject to undertakings. Ultra subsequently operated within Cobham's portfolio, with activities organised around maritime defence, information and communications systems, tactical communications, cyber and mission software, and corporate venture investments. The company is therefore best understood today as a defence-technology busine…
History
Ultra Electronics originated in London in 1920 as Edward E. Rosen & Co., a manufacturer of headphones and loudspeakers established by wireless specialist Teddy Rosen. The business moved premises as it expanded, and Ultra Electric Ltd. was formed in 1925. The Ultra name had already been used for an early commercial moving-iron loudspeaker. During the 1930s, the company entered the domestic-radio market, launching all-electric and mains-powered receivers and selling models such as the Blue Fox, Lynx, Panther, and Tiger. It also began receiving aviation orders and moved to larger production facilities. In 1939, Ultra presented a television receiver for the BBC's high-definition service. The Second World War redirected the company toward aviation production. It supplied tails, bomb doors, and other aerostructures, with the Short Stirling among the first aircraft to incorporate its products. After 1945, Ultra returned to civilian manufacturing while retaining important military and aerospace capabilities. It produced components for aircraft engines such as the Armstrong Siddeley Mamba and Rolls-Royce Avon, including regulators, valves, and throttle-control equipment. Television manufacturing began in 1953, followed by the opening of a Gosport factory for radio and television production. Ultra acquired Pilot Radio & Television in 1959 and reorganised in 1960 into consumer and industrial/electronic activities. The consumer business passed to Thorn Electrical Industries in 1961, while the remaining company continued as Ultra Electronics Ltd. The post-transfer business developed defence products including Jezebel sonobuoys and the SARAH search-and-rescue beacon. Ultra also supplied systems for Concorde, including controls associated with its droop nose and engines. Dowty Group acquired Ultra in 1977 and incorporated it into its electronics division. During the 1980s and early 1990s, the business grew in aerospace and maritime engineering, including stealth and anti-submarine work. In 1993, Julian Blogh led a management buyout of seven companies from Dowty's Electronic Systems Division, returning Ultra Electronics to independent ownership. The company won a major US government export order in 1995 and was floated on the London Stock Exchange in 1996. From 2000 onward, Ultra expanded through acquisitions. It purchased Datel Ferranti Group, Audiopack Technologies, Adaptive Materials, Extec Integrated Systems, cyber-security companies, Forensic Technology, and the Electronic Products Division of Kratos Defense & Security Solutions. This broadened its portfolio into communications, fuel cells, forensic identification, electronic warfare, and radio-frequency products. The company also promoted UltraQuiet active noise-control and aircraft vibration-damping technologies, which were incorporated into aircraft by manufacturers including Bombardier Aerospace and Airbus. The acquisition programme and decentralised structure later attracted criticism. A 2017 profit warning was followed by a share-price decline and the departure of chief executive Rakesh Sharma. In 2018, the Serious Fraud Office opened an investigation into suspected corruption. Management subsequently pursued a “focus, fix and grow” programme centred on reinvestment in underwater defence and expansion in the United States. Cobham agreed to acquire Ultra Electronics in 2021. The transaction was reviewed under UK national-security procedures because Ultra supplied sensitive defence capabilities and Cobham was owned by Advent International. Approval was granted in 2022 subject to undertakings. Ultra thereafter operated as part of Cobham's defence-technology group, with capabilities spanning maritime and underwater systems, secure communications, cyber and mission software, tactical communications, and related aerospace technologies. Later portfolio changes described in the supplied reference material require independent verification before being treated as established historical facts.
- 2022
UK national-security approval
[1]The UK government approved the Cobham transaction subject to undertakings.
- 2021
Cobham announces acquisition
[1]Cobham agreed to acquire Ultra Electronics for approximately £2.6 billion.
- 2017
Profit warning and leadership change
[1]A profit warning led to a major share-price fall and the resignation of chief executive Rakesh Sharma.
- 1996
Listed on the London Stock Exchange
[1]Ultra Electronics became a publicly traded company.
- 1993
Management buyout restores independence
[1]A buyout led by Julian Blogh separated seven businesses from Dowty's Electronic Systems Division.
- 1977
Acquired by Dowty Group
[1]Ultra became part of Dowty's Electronics Division.
- 1961
Consumer-electronics activities transferred to Thorn
[1]The consumer radio and television interests became part of Thorn Electrical Industries, leaving Ultra's continuing business more industrial and defence oriented.
- 1953
Television manufacturing begins
[1]Ultra added television sets to its post-war consumer-electronics activities.
- 1940
Expansion into wartime aircraft production
[1]Ultra supplied aerostructures and aircraft components, including tails and bomb doors for the Short Stirling.
- 1939
Television receiver demonstrated for BBC service
[1]The company presented a receiver for the BBC's 405-line high-definition television service.
Products and positioning
A specialist, engineering-led defence and aerospace supplier focused on mission-critical electronics, underwater warfare, secure communications, and high-reliability systems.
Consumer electronics · 1930
Domestic radio receivers
Ultra produced a broad range of domestic radio receivers during the 1930s, including the Blue Fox, Lynx, Panther, and Tiger models. The range included all-electric and mains-powered sets and established the company's early reputation in wireless equipment before its later shift toward aviation and defence electronics.
Consumer electronics · 1953
Television receivers
Ultra entered television manufacturing in the post-war period and produced receivers for the British market. Its television activities were later transferred to Thorn Electrical Industries in 1961, which continued to use the Ultra brand for a period.
Underwater defence · 1961
Jezebel and Mini-Jezebel sonobuoys
Jezebel and Mini-Jezebel were sonobuoy products associated with Ultra's post-war defence-electronics business. Sonobuoys support the detection and monitoring of underwater activity and became part of the company's broader maritime and anti-submarine technology portfolio.
Search and rescue · 1962
SARAH beacon
The Search and Rescue and Homing, or SARAH, radio beacon was developed by Ultra in 1962. It was designed to assist the location of people or craft in distress and was subsequently used internationally.
Aerospace electronics
Aircraft control systems
Ultra developed electronic and electromechanical control equipment for aircraft and engines, including temperature regulators, fuel-flow valves, throttle controls, and systems associated with Concorde's droop nose and engine control. These products illustrate the company's long-running role as a specialist aerospace supplier.
Aircraft cabin systems · 1990
UltraQuiet noise-control systems
UltraQuiet was a family of active noise-control and vibration-damping technologies developed to reduce aircraft cabin noise. The systems were promoted particularly for turboprop aircraft, where cabin noise was a competitive disadvantage relative to jet aircraft, and related technologies included noise-reduction seating.
Defence electronics · 2015
Electronic warfare and radio-frequency systems
Through acquisitions including the Electronic Products Division of Kratos Defense & Security Solutions, Ultra expanded its capabilities in electronic warfare, radio-frequency electronics, and associated defence applications. These products complemented its existing communications and aerospace businesses.
Controversies
2018
Serious Fraud Office investigation
The Serious Fraud Office announced a criminal investigation into suspected corruption at Ultra Electronics. The announcement contributed to a further fall in the company's share price. The supplied reference does not establish a final legal outcome and should not be supplemented without an authoritative source.
Marketing campaigns
- 2020Ultra Electronics brand relaunch
International
Ultra Electronics introduced new corporate branding as part of its modernisation and positioning as a global defence and security technology group.
Outcome. The relaunch preceded the company's acquisition by Cobham and its integration into Cobham's wider portfolio.
Brand decisions
2021
Cobham acquisition agreementM&ABackground
Ultra was a strategically important UK defence contractor, while Cobham was owned by US-based Advent International, creating national-security concerns.
Action taken
Cobham agreed to acquire Ultra Electronics for approximately £2.6 billion.
Aftermath
The transaction received UK government approval in 2022 subject to undertakings, and Ultra became part of Cobham.
Proposed acquisition value. £2.6 billion (2021)
2017
Focus, fix and grow turnaroundStrategyBackground
A profit warning and criticism of acquisition quality, operating complexity, and underinvestment prompted a strategic reassessment.
Action taken
Management concentrated resources on core underwater-defence capabilities and sought greater growth in the United States.
Aftermath
The company's share price recovered strongly during 2019 and 2020 according to the supplied reference material.
1993
Management buyout from DowtyM&ABackground
Following Dowty's acquisition and subsequent corporate restructuring, seven businesses in the Electronic Systems Division were separated from the group.
Action taken
Julian Blogh led a management buyout that re-established Ultra Electronics as an independent company.
Aftermath
Ultra later floated on the London Stock Exchange and pursued an acquisition-led expansion strategy.
Recent events
- 2022
UK approves Cobham acquisition subject to undertakings[1]
M&A · Regulation
The UK government approved Cobham's acquisition of Ultra Electronics after reviewing national-security implications and imposing undertakings.
- 2021
Cobham agrees to acquire Ultra Electronics[1]
M&A · Regulation
Cobham proposed a purchase of Ultra Electronics for approximately £2.6 billion, beginning a transaction that required UK national-security scrutiny.
- 2017
Ultra Electronics reports profit warning and chief executive resignation[1]
Leadership change · Other
A profit warning was followed by a substantial fall in the company's share price and the resignation of chief executive Rakesh Sharma. Coverage linked the difficulties to acquisition quality, defence-spending delays, and concerns about investment and revenue recognition.
Sources1 sources
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