LONDON – Biotech billionaire Bob Duggan is taking a majority stake in Summit Therapeutics plc, as part of a proposed subscription and placing to raise $50 million. The scheme has to be voted through by shareholders, but assuming it is approved, Duggan will control approximately 73% of Summit’s enlarged share capital. Duggan previously invested $25 million in the company at the start of 2019, and already holds 49% of the stock.