Robert Nickelsberg | Getty Images. SunEdison shares plummeted amid a report that it is preparing to file for bankruptcy.

SunEdison (NYSE: SUNE) shares plummeted more than 50 percent in after-hours trading Friday amid a report that the troubled energy company could file for bankruptcy.

The company is preparing to file in the coming weeks, The Wall Street Journal reported, citing sources. It is working with creditors on bankruptcy financing, according to the outlet.

The report dealt another blow to SunEdison, which has seen its stock plunge this year amid questions about its financial reporting. Shares have shed 90 percent of their value this year.



OppenheimerFunds, David Einhorn's Greenlight Capital and Vanguard Group are among the largest SunEdison shareholders.

SunEdison did not immediately respond to CNBC's request for comment.

Read the full Wall Street Journal report here.





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