Nobody ever accused investors of loyalty. SAC Capital Advisors, the hedge fund headed by billionaire Steven A. Cohen and the center of federal probes of insider trading, is now facing a deadline on Monday for investors to submit second-quarter redemption notices. That means that those investors will potentially pull out billions of dollars. Roughly $6.75 billion of the firm's $15 billion is from outside investors, and estimates of $3.5 billion in redemptions would halve the amount of money outsiders have in the fund. It's not looking good.