SECTOR COMMENTARYThe energy sector was the worst performing subsector during the broader market retreat today as investors moved off to the sidelines or took gains after a strong run in the markets and sector over the past six-weeks that has taken the S&P 500 near record highs.WTI crude futures gained $1.31 or 1.37% to end the volatile day of trading at $97.03, while Brent crude fell back roughly 0.5%, narrowing the spread between the higher-priced Brent futures and their U.S. counterparts after the spread had widened considerably last week.  Meanwhile, ...