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.

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 fundamental analysis and traditional valuation metrics to find stocks that they believe are being undervalued by the market at large.

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 Invesco (IVZ Quick QuoteIVZ - Free Report) . IVZ is currently holding a Zacks Rank #2 (Buy) and a Value grade of A. The stock is trading with a P/E ratio of 10.45, which compares to its industry's average of 15.53. IVZ's Forward P/E has been as high as 11.12 and as low as 6.39, with a median of 9.43, all within the past year.

Value investors also frequently use the P/S ratio. This metric is found by dividing a stock's price with the company's revenue. Some people prefer this metric because sales are harder to manipulate on an income statement. This means it could be a truer performance indicator. IVZ has a P/S ratio of 1.65. This compares to its industry's average P/S of 3.18.

These are only a few of the key metrics included in Invesco's strong Value grade, but they help show that the stock is likely undervalued right now. When factoring in the strength of its earnings outlook, IVZ looks like an impressive value stock at the moment.