Steve Cohen

John Gapper

There are various ways for prosecutors to put pressure on people, and one is to let them know they are being investigated – and then wait.

Steve Cohen of SAC Capital, the embattled hedge fund, is finding out how tough Preet Bharara, federal attorney for the southern district of New York, can play. Mr Bharara is taking his time in assembling a case against SAC for alleged insider trading

After six years of scrutiny, and repeated legal action against those around him, Steve Cohen remains a free man. His $15bn hedge fund SAC Capital is still in business and he still firmly maintains his innocence, despite the evident disbelief of regulators and prosecutors. It is time to prosecute him.