Bearproof stocks: These stocks have a history of holding up when the market struggles

* Screened S&P 500's worst days for resilient stocks * Kroger, Southern Company, Cboe Global Markets show consistent gains * All three stocks have at least 5% upside per analysts Despite market turbulence, three stocks rose when the S&P 500 fell sharply. Kroger gained nearly 70% of the time, Southern Company 63%, and Cboe Global Markets 75%. Analysts see at least 5% upside for each: Kroger (+26%), Southern (+10%), and Cboe (+6%).