Sable Offshore, briefly buoyed by a Trump administration push to boost oil production off the California coast, lost roughly half its market value after it turned to equity and bond investors to repay debt owed to Exxon Mobil. The stock of the Houston-based oil driller plunged as much as 55 percent on Tuesday, to an all-time low of $3.15 per share, after the company said it would raise $400 million through stock and convertible note offerings, therefore diluting existing investors.