A Goldman Sachs senior manager in London has resigned after making millions from cryptocurrency.

The now ex-managing director and head of emerging market sales, Aziz McMahon, quit after making millions of pounds from a bet on the digital currency ether, three former employees at the investment bank told CNBC.

McMahon is believed to have cashed in at least $14 million of cryptocurrency, the sources said.

Earlier reports had said McMahon left Goldman after making money from dogecoin, which it is possible he may have had some holdings there, too.

According to CNBC, “When approached by CNBC, Goldman Sachs confirmed McMahon’s departure but declined to comment any further. McMahon was not immediately available for comment when contacted by CNBC via LinkedIn.”

Ether is the second-largest cryptocurrency by market value after bitcoin.

Investor Kevin O’Leary told CNBC, “Bitcoin will always be the ‘gold.’ Ethereum will always be the ‘silver.’”

Dogecoin, the cryptocurrency created by software engineers Billy Markus and Jackson Palmer as a joke, is now the fourth-largest crypto by market value on CoinMarketCap, worth more than $68 billion.

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