Here at Zacks, we focus on our proven ranking system, which places an emphasis on earnings estimates and estimate revisions, to find winning stocks. But we also understand that investors develop their own strategies, so we are constantly looking at the latest trends in value, growth, and momentum to find strong companies for our readers.

Looking at the history of these trends, perhaps none is more beloved than value investing. This strategy simply looks to identify companies that are being undervalued by the broader market. Value investors use tried-and-true metrics and fundamental analysis to find companies that they believe are undervalued at their current share price levels.

On top of the Zacks Rank, investors can also look at our innovative Style Scores system to find stocks with specific traits. For example, value investors will want to focus on the "Value" category. Stocks with high Zacks Ranks and "A" grades for Value will be some of the highest-quality value stocks on the market today.

One company value investors might notice is Perrigo (PRGO Quick QuotePRGO - Free Report) . PRGO is currently holding a Zacks Rank #2 (Buy) and a Value grade of A. The stock is trading with a P/E ratio of 7.18, which compares to its industry's average of 21.41. Over the last 12 months, PRGO's Forward P/E has been as high as 10.15 and as low as 7.18, with a median of 8.59.

Value investors also use the P/S ratio. The P/S ratio is calculated as price divided by sales. Some people prefer this metric because sales are harder to manipulate on an income statement. This means it could be a truer performance indicator. PRGO has a P/S ratio of 0.72. This compares to its industry's average P/S of 1.43.

These are just a handful of the figures considered in Perrigo's great Value grade. Still, they help show that the stock is likely being undervalued at the moment. Add this to the strength of its earnings outlook, and we can clearly see that PRGO is an impressive value stock right now.