Why adding Twitter to the S&P 500 could be a ‘sell’ signal for the stock By: MarketWatch June 05, 2018 at 15:52 PM EDT Stocks deleted from an index tend to outperform stocks that replace them, writes Mark Hulbert. Read More >> Related Stocks: Alcoa Corp Bank of America Goldman Sachs Group HP Inc International Business Machines Monsanto Co Nike Inc Schwab U.S. Broad Market ETF Total Stock Market ETF Vanguard Twitter, Inc. Visa