Smaller companies have also told the BBC that being listed on UK markets is just not worth it.
Biotech company E-therapeutics was listed in London for 17 years – until last week. Boss Ali Mortazavi is also looking at the US and said the London market is now broken and closed.
“Has it reached a crisis point? Unequivocally yes”, he said.
“In fact, I think that’s a bit of an understatement. I would call it existential risk.”
The UK’s biggest company Shell has repeatedly warned that it would look at “all options” to narrow the 30% discount that Shell is valued at compared to its US rivals. Shell’s chief executive Wael Sawan told the BBC last year that US markets had rolled out the red carpet.
“I extend my real appreciation to the folks at the New York Stock Exchange. The welcome we had there was exemplary.”
Asked about a potential move to New York, he said: “It would be irresponsible to rule anything out.”