This stock can protect your portfolio without sacrificing upside potential.Analysts at the Bank of Montreal recently revealed a list of 28 stocks they believe are the market's highest-quality businesses. "While we continue to be relatively bullish on the outlook for U.S. stocks," the bank revealed, "we do believe that investors will be forced to contend with higher levels of volatility over the near term." By investing in high-quality businesses, these analysts believe investors can protect their portfolios ...