Diploma plc

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Public (LSEDPLM)
Industry Technical products and services
Founded 1931
Headquarters London, United Kingdom
Key people
John Rennocks, Chairman
Bruce Thompson, Group Managing Director
Revenue £382.6 million (2016)[1]
£55.4 million (2016)[1]
£39.1 million (2016)[1]
Website www.diplomaplc.com

Diploma is a leading British-based business supplying specialised technical products and services. It is a constituent of the FTSE 250 Index.


The company, which was founded in 1931, was first listed on the London Stock Exchange in 1960 and until the 1980s was a market leader in electronic component distribution, building products and special steels.[2] The electronic component distribution business (SEI Macro) was sold in 1999,[3] the building products business (Robert Lee) was sold in 2000[4] and the special steels business (Henry Whitham) was sold in 2001.[5]


The company now has operations organised as follows:[6]

  • Life sciences
  • Seals
  • Controls


  1. ^ a b c "Annual Report 2016" (PDF). Diploma. Retrieved 18 April 2017. 
  2. ^ Diploma: Company History
  3. ^ SEI Macro sold to Avnet in £37.5m deal Electronics Weekly, 3 September 1999
  4. ^ "About Robert Lee Distribution". rlee.co.uk. Archived from the original on 15 June 2012. Retrieved 28 March 2015. 
  5. ^ Diploma sells Henry Whitham for 11.1 mln stg AFX UK Focus, 20 March 2001
  6. ^ "At a glance". Diploma plc. Retrieved 3 April 2016. 

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