Aena soars 20% as investors pile into blowout €4bn IPO

Shares in Aena, the largest airport operator in the world by transit numbers, shot up 20.6% on Wednesday when they began trading in Madrid, as investors, many of them dissatisfied with their shrunken IPO allocations, scrambled for shares in the aftermarket. The shares climbed another 5% on Thursday morning, before sliding back to close at the same level as Wednesday night.