Caesars Entertainment (CZR) tumbled 10% in after-hours trading Monday after it said it lost $3.65 a share in the fourth quarter, more than twice as much as it lost a year ago and far worse than the $2.04-a-share loss expected. Fourth-quarter revenue slid 4.3% to $2.17 billion, also missing Wall Street's target, largely because of Superstorm Sandy, which temporarily shuttered the company's Atlantic City casinos. While rivals have shifted their