S&P index error may have sparked turbulence in Morgan Stanley, Pfizer shares, traders say

An error by S&P Dow Jones Indices may have contributed to volatility in shares of Morgan Stanley, Pfizer, PNC Financial Services Group and other stocks in recent days, traders said. At issue was a list of pending changes to the Dow Jones U.S. Dividend 100 Index that S&P Dow Jones Indices released late on March 1, naming 10 companies slated for addition to the index and two for deletion. A S&P spokeperson said an unspecified error led to the wrong names being provided to clients.