According to @StockMKTNewz, the S&P 500 will rebalance with SanDisk (SNDK) replacing Interpublic Group (IPG) effective before the U.S. market opens on November 28. According to S&P Dow Jones Indices methodology, if this change is confirmed, index-tracking funds would be required to buy SNDK and sell IPG at the effective time, creating mechanically driven order flow around the implementation window. According to Western Digital’s 2016 acquisition disclosures, SanDisk was acquired and the SNDK ticker was retired, so traders should verify an official notice from S&P Dow Jones Indices before acting on this report.