Money Warren Buffett’s Berkshire Hathaway bought $4 bil. worth of J.P. Morgan stock last quarter November 14, 2018Thomas Franck, CNBCComments Off on Warren Buffett’s Berkshire Hathaway bought $4 bil. worth of J.P. Morgan stock last quarter Warren Buffett's Berkshire Hathaway boosted its bet on big U.S. banks with the purchase of more than 35 million shares of J.P. Morgan, filings show.