By Charlie Conchie The boss of pharma firm Redx has scooped up hundreds of thousands of shares in the company after its share price collapsed on the news it would ditch its listing on the London Stock Exchange. According to filings on the London Stock Exchange, Lisa Anson, chief executive of Redx, has bought some 589,000 shares in the firm over the past two weeks, worth around £38,875. She now holds a stake of around 0.2 per cent in Redx, which has a market capitalisation of about £45m. Shares in Redx plunged 70 per cent at the start of April after the company revealed it would ditch its listi…