It's being called the worst IPO in London's history. Shares in the food delivery app Deliveroo closed 26% down on the day of its public listings debut, wiping £2 billion (US$2.75 billion) from its £7.6 billion ($10.5 billion) opening market capitalization. Much of the blame was being laid at the feet of a disastrous roadshow, where its Goldman Sachs and JP Morgan advisors refused to name the three "anchor investors" who were based outside the UK. British fund managers also were spooked by a dual-class share structure which gave its CEO Will Shu outsized voting rights 20 times those of other investors. But the structure also meant Deliveroo didn't debut into the FTSE 100 index, meaning passive tracker funds buying shares in the index would pass over Deliveroo.