Appaloosa Management LP, run by billionaire David Tepper, dumped its holdings in Walt Disney Co. DIS, -0.77% , Netflix Inc. NFLX, +3.15% and Micron Technology Inc. MU, -1.18% , according to a Securities and Exchange Commission filing late Monday. In the filing, Appaloosa no longer listed shares of Disney or Netflix, which it reported having a 50,000-share stake in each in August, or Micron, which it listed as having 575,000 shares previously.