Portfolio Manager A was the coy description of Steven Cohen used by the Securities and Exchange Commission as it this week made its allegations in the largest case of insider trading in US history.
But there is no doubt that the mystery manager is the founder of SAC Capital, the $14bn hedge fund at the heart of the alleged scheme.
Away from his beloved trading desk, the 56-year-old Mr Cohen, balding with eyes that betray decades of early mornings, is a direct but unimposing presence. At the desk, however, he is a snarling and aggressive trader, one revered and feared across Wall Street.
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