White-hot money transfer startup TransferWise is now worth $3.5 billion after raising $292 million in secondary funding. This will have involved early investors selling their stakes to bigger, richer investors. These kinds of trades are still unusual in the European tech ecosystem, which is younger than Silicon Valley, but is heating up fast. Experts agree the TransferWise deal is good news: it puts cash back into the ecosystem; gives TransferWise flexibility to go public when it chooses; and shows growing sophistication in the market. Existing institutional investors doubling down is also a bullish sign, experts said.