Bit Brother, a Chinese tea retailer that has branched out into cryptocurrency mining, is an unlikely candidate to top the trading leader boards in the vast US stock market.
But for the past two months an average of 572mn shares in the lossmaking firm, whose market value is less than $2mn, have changed hands each day. That is more than any of the biggest names in corporate America including Tesla, the $565bn behemoth whose stock is often frenetically traded.
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