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, 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 use a variety of methods, including tried-and-true valuation metrics, to find these stocks.

Luckily, Zacks has developed its own Style Scores system in an effort to find stocks with specific traits. Value investors will be interested in the system's "Value" category. Stocks with both "A" grades in the Value category and high Zacks Ranks are among the strongest value stocks on the market right now.

One stock to keep an eye on is ENGIE - Sponsored ADR (ENGIY Quick QuoteENGIY - Free Report) . ENGIY is currently sporting a Zacks Rank #2 (Buy) and an A for Value. The stock holds a P/E ratio of 9.66, while its industry has an average P/E of 16.74. ENGIY's Forward P/E has been as high as 11.37 and as low as 6.67, with a median of 9.61, all within the past year.

Another valuation metric that we should highlight is ENGIY's P/B ratio of 1.14. The P/B ratio pits a stock's market value against its book value, which is defined as total assets minus total liabilities. This stock's P/B looks attractive against its industry's average P/B of 2.87. Over the past 12 months, ENGIY's P/B has been as high as 1.28 and as low as 0.86, with a median of 1.05.

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