Three senior executives at Steven Cohen’s SAC Capital Advisors LP received subpoenas as part of the U.S. multi-year probe into insider trading at the hedge fund, Bloomberg News reported yesterday. Subpoenas were sent to Tom Conheeney, president of SAC; Steve Kessler, head of compliance; and Phillipp Villhauer, head trader. Cohen, SAC’s billionaire founder, was sent a subpoena last week to appear before a federal grand jury. After Cohen was summoned, SAC Capital told clients in a May 17 letter that it was no longer cooperating unconditionally with the government and it would no longer be updating clients on the matter.