Investor who called last two major market crashes says bitcoin is a bubble By: CNBC.com News January 04, 2018 at 12:51 PM EST Noted investor Jeremy Grantham, who called the last two major market bubbles, said bitcoin is a bubble that may crash soon. Read More >> Related Stocks: Amazon.com Bitcoin (Bitstamp) Bitcoin Composite CBOE Global Markets Inc CME Group Emrg Mkts Ishares MSCI ETF