Steve Cohen just got into a stock that has been nailing hedge funds this summer

Billionaire investor Steve Cohen's family office, Point 72 Asset Management, has taken a 5.1% stake in SunEdison, a solar energy manufacturer, according to government filings.

The stock popped briefly in after-hours trading when the news broke on Monday, but has since reversed course. It is now down 47% since the beginning of the year.

SunEdison started plunging in July, blowing a hole in portfolios across Wall Street.

Greenlight Capital's David Einhorn wrote that it was his fund's "biggest loss" in a Q2 letter to investors.

And on the company's conference call last month Omega Advisors' Leon Cooperman asked if SunEdison executives would buy back stock to support the share price.

Their answer was no.

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