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In a separate announcement, the regulator also issued a warning on newly popular cryptocurrency derivatives. A number of platforms now offer contracts-for-difference based on digital currencies such as bitcoin.
CFDs track the price of an underlying asset and allow investors to leverage their bets, magnifying gains or losses. The FCA warned that the price volatility of the underlying cryptocurrencies - which in some cases have dropped by more than 30 per cent in a day - and the high leverage offered by some firms meant customers could suffer considerable losses.
In some cases, they could end up owing money to the firm, it said.