Despite having called Bitcoin BTC +0.59% an "immature asset class" that is inappropriate for long-term investors, Vanguard Group has become the largest shareholder in Strategy, according to a report from Bloomberg. Through its funds, the $10-trillion money manager owns 20 million Strategy shares or 8% of the outstanding common stock, according to a Bloomberg chart. Vanguard most likely passed Capital Group Cos. to become the top shareholder of Strategy shares during the fourth quarter, the report said. Strategy (ticker MSTR), formerly known as MicroStrategy, has become a proxy bet for Bitcoin as the company's chief business proposition has been acquiring...