IndustryTechnical products and services
HeadquartersLondon, United Kingdom

Key people

John Nicholas, Executive Chairman
RevenueDecrease £538.4 million (2020)[1]
Decrease £69.8 million (2020)[1]
Decrease £49.8 million (2020)[1]

Diploma is a 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 was a market leader in electronic component distribution, building products and special steels until the late 1980s.[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]

It was announced in August 2018 that CEO Richard Ingram will be stepping down after four months in charge, with John Nicholas acting as executive chairman in interim charge.[6]


The company has operations in North America, Europe, Australia, New Zealand, New Caledonia, and China and is organised as follows:[7]

  • Life sciences
  • Seals
  • Controls


  1. ^ a b c Annual Report 2020 (PDF). Diploma. Retrieved 28 February 2021.
  2. ^ Diploma plc sees expansion in CAD/CAM, memory chip markets. CBR online. 17 May 1989.
  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. ^ Editorial, Reuters. UPDATE 1-Diploma CEO steps down after four months in charge. U.S. Retrieved 2018-10-24.
  7. ^ Miller, Cameron M. (2018-04-09). Diploma Plc - Enough To Seal The Deal?. Seeking Alpha. Retrieved 2019-04-23.

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