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20. Randox Holdings

  • Managing director: Dr Peter FitzGerald
  • Pre-tax profit: £18m
  • Employment: 1,129
  • Pay bill: £30.4m

Randox is a global leader in healthcare diagnostics. More than 5% of the world’s population – receives medical diagnosis using Randox products each year.

Randox is the largest diagnostic company from the UK and exports over 95% of products worldwide. Randox has an extensive portfolio including food diagnostics, alcohol and drugs testing, and a comprehensive test menu of markers for disease diagnosis and risk.