Shares in betting companies such as GVC and William Hill fell sharply on Monday after a report by a cross-party group of MPs called for measures to overhaul online gambling and protect vulnerable people.
The MPs have called for a limit on the maximum stakes on online slot machines, similar to the £2 limit brought in for fixed-odds betting terminals (FOBTs).
They are also seeking a ban on the use of credit cards to gamble online.
Laura Foll, fund manager at Janus Henderson Investors, told BBC Radio 5 Live’s Wake Up To Money that she did not own such gambling shares in her fund.
“I find this regulation hard to predict. The direction has to be that regulation is going up,” she said.