Of these, perhaps no stock market trend is more popular than value investing, which is a strategy that has proven to be successful in all sorts of market environments. Value investors rely on traditional forms of analysis on key valuation metrics to find stocks that they believe are undervalued, leaving room for profits. One company value investors might notice is United Airlines (UAL) . UAL is currently sporting a Zacks Rank of #2 (Buy), as well as an A grade for Value. Value investors also use the P/S rat ...