The stock’s relative attractiveness doesn't justify paying more than double for the same coin, Kerrisdale said. MicroStrategy's (MSTR) shares fell as much as 14% on Thursday after a prominent short seller, Kerrisdale Capital, said in a report that it is short-selling the stock while betting long on bitcoin {{BTC}}. “Shares of MicroStrategy have soared amid a recent rise in the price of bitcoin, but as is often the case with crypto, things have gotten carried away,” the short seller wrote.