(Barron’s) Denver-based managed futures specialist Equinox Fund Management must repay investors about $6 million to settle an investigation that found it overcharged investors and deviated from its valuation methodology for derivatives, the Securities and Exchange Commission said on Monday.Equinox has agreed to refund investors $5.4 million in excessive management fees plus some $600,000 in prejudgment interest; the firm also agreed to pay a $400,000 penalty.