This firm’s Siltuximab drug was given regulatory approval in America in July for a phase three clinical trial treating patients with Covid-19, after seeing success in improving patient survival rates. The company has already had direct orders for the drug from the governments of Belgium and Belarus. It was founded by chief executive Lee Morley, 50, and chief financial officer Emma Johnson, 39, who spun the firm out of Jazz Pharmaceuticals in 2015. Sales grew to £92.6m in 2019, thanks to the success of a number of drugs the firm has acquired, including those that treat cancers in children, which Eusa Pharma has been able to make available in more countries.