While the proven Zacks Rank places an emphasis on earnings estimates and estimate revisions to find strong stocks, we also know that investors tend to develop their own individual strategies. With this in mind, we are always looking at value, growth, and momentum trends to discover great companies.

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.

Zacks has developed the innovative Style Scores system to highlight stocks with specific traits. For example, value investors will be interested in stocks with great grades in the "Value" category. When paired with a high Zacks Rank, "A" grades in the Value category are among the strongest value stocks on the market today.

One stock to keep an eye on is PLYMOUTH IND RE (PLYM Quick QuotePLYM - Free Report) . PLYM is currently holding a Zacks Rank of #1 (Strong Buy) and a Value grade of A. The stock holds a P/E ratio of 6.37, while its industry has an average P/E of 16.63. PLYM's Forward P/E has been as high as 15.65 and as low as 6.12, with a median of 10.06, all within the past year.

Finally, investors should note that PLYM has a P/CF ratio of 8.86. This metric takes into account a company's operating cash flow and can be used to find stocks that are undervalued based on their solid cash outlook. This stock's P/CF looks attractive against its industry's average P/CF of 16.15. Over the past 52 weeks, PLYM's P/CF has been as high as 10.29 and as low as 6.65, with a median of 8.87.

These figures are just a handful of the metrics value investors tend to look at, but they help show that PLYMOUTH IND RE is likely being undervalued right now. Considering this, as well as the strength of its earnings outlook, PLYM feels like a great value stock at the moment.