And as institutional investors rushed to get a slice of the fintech company's, its shares closed up 10.4 per cent at 265p per share, giving it a market cap of £5.28bn on its first day of trading.
Companies are clamouring to list on the London Stock Exchange in the wake of the General Election in May, when a business-friendly Conservative government won a majority. Share registrar Equiniti priced its initial public offering today, while retirement housebuilder McCarthy & Stone finally announced its intention to float.
But how does this compare to some of the biggest London listings so far this year?
Second-hand car sales website Auto Trader ended its first day of trading with a market cap of £2.65bn, meanwhile cyber security giant Sophos also scraped into billion-pound valuation territory with £1.09bn.