Shares of Coinbase Global Inc. COIN said Thursday that it repurchased $64.5 million worth of 0.50% convertible senior notes, in privately negotiated deals that represent about 29% discounts to par value. After the repurchases close, which is expected to occur on June 20, about $1.373 billion principal amount of the notes will remain outstanding. Shares of the cryptocurrency exchange dropped 4.6% in premarket trading. Prices of Coinbase’s bonds have been selling off after the U.S. Securities and Exchange Commission filed charges against the company as part of a broader crackdown of the crypto industry. “As we stated in…