Shares of Carvana plummeted by more than 40% during trading Wednesday after the embattled online used car retailer's largest creditors signed a deal binding them to act together in negotiations with the company. The pact, as first reported by Bloomberg, includes creditors such as Apollo Global Management and Pacific Investment Management that hold around $4 billion of Carvana's unsecured debt, or about 70% of the total outstanding. The agreement will last at least three months. Such creditor agreements are viewed as a way to streamline negotiations around new financing or a debt restructuring.