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The Plessey Company plc was a British electronics, defence and telecommunications company. It originated in 1917, growing and diversifying into electronics. It expanded after World War II by acquisition of companies and formed overseas companies.

It was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index. In 1989, it was taken over by a consortium formed by GEC and Siemens which split the assets of the Plessey group.

The majority of Plessey"s defence assets were amalgamated into BAE Systems in 1999 when British Aerospace merged with the defence arm of GEC, Marconi Electronic Systems (MES). A small portion of the defence market, mostly embedded electronic systems and circuitcards remained with GE, formerly GE Fanuc and GE Intelligent Platforms (GE-IP) and now Abaco Systems based in Huntsville, Alabama, and in Towcester, Northamptonshire. The bulk of Plessey"s telecommunications assets were acquired by Ericsson through its 2005 acquisition of Marconi Communications, a successor company of GEC.

The Plessey company was founded in 1917 in Marylebone, central London. The original shareholders were Thomas Hurst Hodgson, C. H. Whitaker, Raymond Parker and his brother Plessey Parker.Ilford early in 1919.

An early customer of Plessey was a galvanising company called British Electro Chemists. One of that company"s shareholders was Byron G. Clark, an American, who was also a business associate of T. H. Hodgson, one of the founders of Plessey. The Clark family would eventually dominate the management of Plessey for most of its history. Byron"s son Allen George Clark joined the company in 1921, and went on to become a driving force behind the development of Plessey,John Allen Clark, and Michael William Clark,

During the 1920s Plessey began to diversify into electrical manufacturing. Important contracts included the manufacture of early radiosMarconi and the production of telephones for the General Post Office. In order to increase production, Plessey moved to Vicarage Lane, Ilford, in 1923.John Logie Baird had his first production televisions made by Plessey.

The manufacture of electrical components became an area of growth for Plessey. A vast array of components was manufactured, many under licence from overseas companies. Plessey became one of the largest manufacturers in this field as the radio and television industries grew. In 1936/7, turnover was more than £1 million and Plessey became a public company on 17 March 1937.

Aircraft components was another market into which the company diversified. In 1936, Plessey obtained a number of important manufacturing licences from American companies such as Breeze Corporation for aircraft multi-pin electrical connectors, Federal Laboratories for Coffman starters (an explosive cartridge device used to start aircraft engines), and Pump Engineering Services Corporation for the manufacture of Pesco fuel pumps. Plessey went on to produce large numbers of these fuel pumps for Rolls-Royce Merlin engines, and in 1940 the fuel pump for Britain"s first jet engine was also supplied by Plessey.

During World War II, Plessey produced a vast array of components and equipment for the war effort, including shell cases, aircraft parts, and radio equipment such as the R1155 (receiver), and T1154 (transmitter). In all, 161,500 pieces of wartime electronic equipment were produced.

To allow greater production, Plessey converted five miles of twin tunnel, built for a new extension to the London Underground Central line from Leytonstone to Newbury Park, into a factory.Swindon in Wiltshire, and opened several other shadow factories around the country to produce munitions. Caswell, Northamptonshire became the site of Plessey"s first dedicated research centre in 1940. The wartime workforce of Plessey grew to over 10,000.

In 1951, the Electronics Division was started by Michael Clark. By 1955, this had expanded to become the Electronics and Equipment Group with 5,000 staff. The following year the Roke Manor research facility was set up under the direction of H. J. Finden near Romsey, Hampshire. Plessey produced an early integrated circuit model in 1957, before the patents of Jack St. Clair Kilby of Texas Instruments and Robert Noyce of Fairchild.Havant, Hampshire) and Templecombe, Somerset.

In 1961 Plessey merged with Ericsson Telephones and Automatic Telephone Manufacturing Company of Liverpool, to become Britain"s largest manufacturer of telecommunications equipment, including the majority of the country"s crossbar switches.Christchurch, Dorset, which became the centre of the Plessey Defence Systems business. In 1979, a major subsidiary was set up, Plessey Electronic Systems, which incorporated the three businesses and by 1986 achieved sales of over £500 million and employed 15,000.

Plessey were partners in the development of the Atlas Computer in 1962 and in the development of digital telephone systems, including System X, from the late 1970s.GEC Plessey Telecommunications. Plessey Naval Systems was formed in 1986 by the merger of Plessey Marine with Plessey Displays, which had been part of Plessey Radar.

Plessey were among the first firms to use computers. Their Training Department developed an interactive management game (PITDEX) using TeleType printer/keyboards to link to LEASCO computers in the United States via standard telephones and acoustic couplers.

Plessey also pioneered the gathering and consolidation of accounting information from around the world using in-house software. Each of their 140 management reporting entities used HP125s with DIVAT (data input, validation and transmission) software. Nearly 450 validation rules ensured accuracy within and between various reports. The data were then transmitted to Ilford where a HP 3000 ran Fortran software for consolidation and reporting—also on HP125s.

During the 1970s and early 1980s, Plessey manufactured a series of computer systems and peripherals compatible with Digital Equipment Corporation"s PDP-11. By 1972, Plessey designed the first industrial capability-based security computer, a fault-tolerant multiprocessor system called Plessey System 250. Plessey was also the lead contractor for the Ptarmigan communications system supplied to the British Army, which adopted the System 250 architecture.

In 1959 AT&E, later Plessey, became the prime contractor for a new UK air defence system, known by the company under the name Plan Ahead and, from 1961, as Project Linesman.

The South African roots of Plessey can be traced to the acquisition of AT&E and Ericsson in 1963, and a Cape Town based company, the Instrument Manufacturing Company (IMC), acquired in 1964.

South African insurance and investment company Sanlam bought 26% of Plessey South Africa in 1974, with first right of refusal to purchase more of the company.

In December 1985, GEC launched a takeover bid for the Plessey Company, valuing the group at £1.2 billion. Both Plessey and the Ministry of Defence were against the merger, since GEC and Plessey were the two largest suppliers to the MoD and in many tenders the only competitors. In January 1986, the bid was referred to the Monopolies & Mergers Commission (MMC), whose report published in August advised against the merger. The government concurred and blocked GEC"s bid.

In 1988, Plessey and GEC merged their telecom units to form GEC Plessey Telecommunications (GPT), at the time the UK"s leading telecommunications manufacturer.

In 1988, GEC and Siemens set up a joint holding company, GEC Siemens, to launch a hostile takeover of Plessey. Their initial offer was made on 23 December 1988, valuing Plessey at £1.7 billion. Again, Plessey rejected the offer and again it was referred to the MMC. The original proposal envisaged joint ownership of all of Plessey"s defence businesses, with GPT and Plessey"s North American businesses split in the ratios 60:40 and 51:49 respectively. The level of GEC"s involvement in the Plessey defence businesses was not likely to meet with regulatory approval and in February 1989, GEC Siemens announced a new organisation. The takeover was completed in September 1989.

Plessey Semiconductors factory at Cheney Manor, Swindon in 1982. The factory housed both bipolar and MOS lines. A small part of the canteen facilities (which had five grades of service) for all Plessey employees is visible on the right of the image, since demolished around 2010

GEC Plessey Semiconductors (GPS) was purchased by Mitel Semiconductors of Canada in 1998.silicon on sapphire operation at Lincoln, Lincolnshire by Dynex Semiconductor in 2000, the company renamed itself Zarlink Semiconductor in 2001.Plymouth was acquired by Xfab.

After the sale of the Roborough site in Plymouth to Xfab, the original Plessey Semiconductors site at Cheney Manor, Swindon continued to operate under the Zarlink Semiconductor name until it was sold to MHS Industries in early 2008. In February 2009, the UK business was forced into receivership following the collapse of the parent MHS Electronics business in France. After a subsequent management buyout the company traded as Plus-Semi Ltd.

The Roborough site ( 8" and 6" lines) was re-acquired from Xfab on 1 January 2010 and the company renamed as Plessey Semiconductors Ltd. The new company transferred its Bipolar processes on Silicon & SOI into the 8" Plymouth facility during 2010, exploiting the combined technology base in the development of new processes and products in a number of markets. The Swindon site on the Cheney Manor Industrial estate in the west of the town was demolished in July 2012. In 2011/2, Plessey acquired the rights to disruptive GaN on Silicon technology by acquisition of CamGaN, a startup company, from Cambridge Enterprises.

Using the GaN on Silicon technology and semiconductor expertise, Plessey Semiconductors Ltd manufactured solid state lighting, horticultural lighting and medical sensing products. Their GaN on Silicon i2LED high power LEDs and Stellar Orion Beam Forming modules, launched in autumn 2016, which enabled new form factors of lighting products and remove critical design constraints for lighting product designers. In horticulture, the Plessey Attis Growlight was at the forefront of an engineering approach to LED based plant grow lights which was then developed into a new brand, Hyperion Grow Lights.

In 2017, Plessey pivoted the focus of the business to the R&D and manufacturing of microLEDs (micro light-emitting diodes) as a market disrupting display technology for a wide range of applications, including: Augmented Reality, Mixed Reality, smartphones, televisions, smartwatches, head-up displays, head-mounted displays and more.

In March 2019, Plessey used their GaN on Silicon technology, which natively emits Blue, to innovatively engineer the early layers within the process to emit native Green,

In South Africa, following the successful GEC/Siemens takeover, after protracted negotiations in 1991, Plessey South Africa became a wholly owned subsidiary of Sankorp under the new name of Plessey Tellumat South Africa Limited (PTSA). The addition of the name Tellumat had a double symbolism, firstly for the company"s commitment to exports, as it is the name of its UK-based export subsidiary. Secondly, the name derives from the Tellurometer, South Africa"s world first electronic surveying development—and by implication, a commitment to ongoing electronic research and development.

1995 was a landmark year in the history of the business in South Africa. The merger of PTSA and Tek Electronics, the consumer electronics audio and video products, manufacturer and distributor, (also wholly owned by Sankorp) took the business full circle back to its consumer electronics roots.Plessey South Africa Limited. The full acquisition of AWA-Plessey Communications, which Plessey jointly owned in Australia with Amalgamated Wireless (Australasia) Ltd (AWA) and had a similar product portfolio, resulted in penetration into the Pacific Rim market. The culmination of this growth was the company"s listing on the Johannesburg Stock Exchange (JSE) as the Plessey Corporation in the same year. Trading started off at R4.80 a share.Cape Town causing huge damage to stock, instruments, plant and work in progress. No one was injured, but work was disrupted for several weeks. Large sections of the factory had to be rebuilt.

In August 1998, Plessey Corporation was bought by Dimension Data Holdings and Worldwide African Investment Holdings for R1.6 billion. The new owners retained BSW Data, Plessey Solutions and Communications Systems. The remaining divisions, notably with a product development and manufacturing focus, were bought back by a combined management buyout supported by Rand Merchant Bank. The corporate name was changed to Tellumat Pty Ltd.defence, telecommunications and contract manufacturing markets.

The name is also used to refer to a barcode symbology developed by Plessey, which is still used in some libraries and for shelf tags in retail stores, in part as a solution to their internal requirement for stock control. The system was first used in the early 1970s by J.Sainsbury to identify all of its products on supermarket shelves for its product restocking system. The chief advantages are the relative ease of printing using the dot-matrix printers, which were popular at the time of the code"s introduction, and its somewhat higher density than the more common 2 of 5 and 3 of 9 codes.

Plessey barcodes use two bar widths. Whitespace between bars is not significant. The start element is a wide bar, and the stop element is two narrow bars. In between, the bars are in groups of four. High order bars appear leftmost. Narrow bars are 0 and wide bars are 1.

"PLESSEY SEMICONDUCTORS LTD - Overview". beta.companieshouse.gov.uk. Archived from the original on 3 September 2019. Retrieved 3 September 2019→(free company information from Companies House)link)

"Plessey"s Micro LED Displays Receives a CES 2019 Innovation Award". www.ledinside.com. Archived from the original on 3 September 2019. Retrieved 3 September 2019.

Bush, Steve (5 April 2019). "Why has Plessey developed a native green led microdisplay?". Electronics Weekly. Archived from the original on 16 August 2019. Retrieved 3 September 2019.