UK-listed gambling operator GVC Holdings saw its share price fall on Monday following a report into its Ladbrokes brand’s efforts to hide misdoings from UK regulators.

On Monday, the Guardian reported that Ladbrokes paid nearly £1m to five individuals whose money was stolen by a Ladbrokes’ VIP customer who then lost the stolen sums gambling with Ladbrokes. As a condition of this payment, Ladbrokes required the five recipients to “agree not to bring any complaint or make any report to any regulator in relation to the claim.”

A spokesperson for the UK Gambling Commission (UKGC) told the Guardian that the regulator was “enquiring into this matter to ascertain the full circumstances.” The spokesperson added that it expected its licensees to “to work with us in an open and cooperative way including the need to disclose to us anything which we would reasonably expect to know.”

The Guardian also reported seeing text messages and other evidence indicating that Ladbrokes lavished the VIP customer with perks, including four-figure credits to his gambling account, air travel to attend high-profile sports events and luxury hampers as Christmas gifts.