London Stock Exchange Group PLC LSEG shares inched up 0.93% to £114.35 Wednesday, on what proved to be an all-around grim trading session for the stock market, with the FTSE 100 Index UKX falling 0.28% to 8,335.81.

The chief executive of Britain’s most valuable fintech start-up has taken a swipe at the UK stock market saying it is “not rational” to float in London.

Nik Storonsky has reiterated his preference to go public in the U.S., declaring that it’s “just not rational” to list in London under the current conditions.

Shares of London Stock Exchange Group PLC LSEG inched up 0.35% to £113.30 Tuesday, on what proved to be an all-around great trading session for the stock market, with the FTSE 100 Index UKX rising 0.56% to 8,