S&P index error caused volatility in Morgan Stanley, Pfizer shares

From Yahoo Finance:

An error by S&P Dow Jones Indices caused volatility in shares of companies like Morgan Stanley, Pfizer, and PNC Financial Services Group. The error involved changes to the Dow Jones U.S. Dividend 100 Index, affecting 23 stocks. A replacement list was issued, leading to fluctuations in stock prices. Trading volumes for affected companies were significantly higher this week. Traders scrambled to correct trades made in anticipation of the incorrect changes, highlighting the importance of accurate index information. The Dow Jones U.S. Dividend 100 Index is used by investors and index funds for building portfolios.



Read more at Yahoo Finance: S&P index error may have sparked turbulence in Morgan Stanley, Pfizer shares, traders say