SunEdison Inc. sune stock, which has been plunging amid an investigation by the Securities and Exchange Commission, was cut in half in late trading Friday after a report that the company is preparing to declare bankruptcy. The Wall Street Journal reported Friday afternoon that SunEdison plans to to file for bankruptcy in the coming weeks, and is in talks with creditor groups about bankruptcy financing. The report follows the solar-power company's announcement earlier this week of an SEC investigation into its public disclosures about the amount of cash it had available. Shares fell more than 50% in after-hours action following the report, hitting 22 cents after closing with a 14.9% decrease at 46 cents. Before the late decline, SunEdison stock had declined 91% so far this year and more than 98% in the past 52 weeks.