By Steve Eder The Wall Street Journal November 15, 2011 In the months before hedge fund manager David Einhorn took a bat to Green Mountain Coffee Roasters, high-profile investors, including some prominent hedge fund managers, were busy locking in profits and trading in and out of the then high-flying stock. Chief among them was Steven Cohen’s SAC Capital. SAC sold off about 400,000 shares of Green Mountain during the third quarter, slashing its holdings by 42%, according to a regulatory filing on Monday. Cohen has reduced its shares over the past two quarters, ending the first quarter with 1.8 million shares, before reducing the total to 1 million at end of the second quarter, and 630,000 at close of the third quarter. Green Mountain was among the best performing stocks of the year through the first three quarters, with its shares more than doubling. But on Oct. 17, Einhorn, famous for his clash with Lehman Brothers before its collapse, took the stage at the Value...