Here at Zacks, our focus is on the proven Zacks Rank system, which emphasizes earnings estimates and estimate revisions to find great stocks. Nevertheless, we are always paying attention to the latest value, growth, and momentum trends to underscore strong picks.

Of these, value investing is easily one of the most popular ways to find great stocks in any market environment. 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 company to watch right now is ATN International (ATNI Quick QuoteATNI - Free Report) . ATNI is currently sporting a Zacks Rank #2 (Buy) and an A for Value.

Value investors also use the P/S ratio. The P/S ratio is calculated as price divided by sales. This is a popular metric because sales are harder to manipulate on an income statement, so they are often considered a better performance indicator. ATNI has a P/S ratio of 0.59. This compares to its industry's average P/S of 1.43.

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