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86. Keystone Holdings

  • Founder: Sean Coyle
  • Pre-tax profit: £5.6m
  • Employment: 485
  • Pay bill: £12m
  • Keystone Group is the UK’s largest steel lintel manufacturer and Europe’s fastest growing roof window manufacturer.

    The company says its has grown to its present position in the marketplace by establishing a reputation for reliable supply of quality specialist products.

    The company says that production facilities in South Derbyshire, Cwmbran, Cookstown and Poland provide an efficient working environment.