London-based startup TransferWise has boosted its valuation to $5 billion after concluding a $319 million secondary share sale. New investor D1 Capital Partners and existing shareholder Lone Pine Capital bought into the firm while existing shareholders Baillie Gifford, Fidelity Investments and LocalGlobe expanded their holdings in the fintech. "We're very happy to not have to raise every two to three years to keep the business alive," Matt Briers, TransferWise CFO told Business Insider in an interview.