GlaxoSmithKline has agreed to buy US cancer specialist Tesaro for $5.1 billion, marking a major biotech investment by Chief Executive Emma Walmsley as she seeks to rebuild the group's pharmaceuticals business.
GSK has lagged rivals in recent years in producing multibillion-dollar blockbusters and it largely sat out a spate of dealmaking by rival drugmakers under previous CEO Andrew Witty. That is a situation Walmsley now wants to change.
Britain's biggest drugmaker is paying $75 a share for the business, an 110 percent premium to the 30-day average price. It is also taking on Tesaro's debt. News of the lofty valuation