"We like to be long and short depending on what the models say is likely to happen to the market and we will trade it long and short just as happily and in as big a size as market liquidity lets you trade," he said. "We trade S&P futures all the way to sushi rice futures."
But Ellis said that just because Man Group deals in cryptocurrencies does not mean they were "an asset management product", in which funds "deliver value" by owning an asset for investors. He said cryptocurrencies were "things to trade because they go up and down a bunch".
Like many in the financial world, Ellis is a believer in the potential of the blockchain technology underpinning cryptocurrencies to increase the efficiency of payments systems. But he takes issue with the idea that tokens themselves will forever be "a limited-supply instrument".
"You can have an infinite number of different cryptocurrencies," he said. "Anyone can start another one any day."
For all his doubts about the value of cryptocurrencies, Ellis is empathetic when it comes to the motivation of investors who have turned to such assets — rightly or wrongly — as a potential hedge against inflation.
"The number one thing that clients are worried about is inflation," he said, adding that he expected such anxieties to persist.
"I think we stay in a world of very low rates until central banks lose control and when they lose control, it's not going to be fun," he said. "For some of the strategies we trade, we might do very well. But that doesn't mean it's a good thing."
Written by: Gary Silverman
© Financial Times