JPMorgan Chase CEO Jamie Dimon plunked down $26.6 million of his own money on Thursday to buy his bank’s recently battered shares.The purchase, disclosed in a company filing, added 500,000 shares of JPMorgan Chase to his portfolio and various family trusts. It brings his total JPM holdings to 6.7 million shares, worth $358 million based on Thursday’s closing price.The purchase is somewhat unusual. The overwhelming majority of shares accumulated by ...