This Birmingham-based manufacturer supplies 35m tests a year to diagnose and monitor blood cancers and immune system disorders. It has also developed a Covid-19 antibody test in collaboration with the city’s university. The company has a direct presence in more than 25 countries and 3,000 customers in over 100 countries. More than 90% of sales are generated overseas and exports reached £139.1m in the year to September 2020. The business is led by chief executive Charles de Rohan, 59, and owned by private equity firm Nordic Capital.