Burned by Robinhood not making the S&P 500? Here’s how you can make money the next time this happens. - MarketWatch
1. Robinhood was not added to the S&P 500 index despite speculation. 2. Historically, S&P 500 additions have a declining price impact on stocks. 3. Robinhood shares surged 53.8% before the announcement but fell 8% post-announcement. 4. Even if added, Robinhood would only have 0.13% weighting in the S&P 500. 5. Market reactions show investors overreacting to non-inclusion news.