Nasdaq-listed Microstrategy has bought 14,620 more bitcoin for approximately $ 615.7 million. The latest purchase raised the company’s cryptocurrency holdings to 189,150 bitcoin, acquired for about $ 5.9 billion at an average price of $ 31,168 per coin. Microstrategy’s executive chairman, Michael Saylor, believes that spot bitcoin exchange-traded funds (ETFs) “may be …