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, value investing is easily one of the most popular ways to find great stocks in any market environment. 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.RBB Bancorp (RBB) is a stock many investors are watching right now. RBB is currently sporting a Zacks Rank of #2 (Buy) and an A for Value. The stock holds a P/E ratio of 6.46, while its industry has an average P/E of 9.62. Over the past 52 weeks, RBB's Forward P/E has been as high as 9.80 and as low as 5.93, with a median of 6.88.We should also highlight that RBB has a P/B ratio of 0.92. Investors use the P/B ratio to look at a stock's market value versus 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 1.49. Over the past year, RBB's P/B has been as high as 1.20 and as low as 0.83, with a median of 0.94.Value investors also use the P/S ratio. The P/S ratio is 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. RBB has a P/S ratio of 2.4. This compares to its industry's average P/S of 2.68.Finally, we should also recognize that RBB has a P/CF ratio of 5.69. This data point considers a firm's operating cash flow and is frequently used to find companies that are undervalued when considering their solid cash outlook. This company's current P/CF looks solid when compared to its industry's average P/CF of 9.07. Over the past year, RBB's P/CF has been as high as 8.29 and as low as 5.12, with a median of 5.98.Value investors will likely look at more than just these metrics, but the above data helps show that RBB Bancorp is likely undervalued currently. And when considering the strength of its earnings outlook, RBB sticks out at as one of the market's strongest value stocks. Zacks Names "Single Best Pick to Double" From thousands of stocks, 5 Zacks experts each have chosen their favorite to skyrocket +100% or more in months to come. From those 5, Director of Research Sheraz Mian hand-picks one to have the most explosive upside of all. It’s a little-known chemical company that’s up 65% over last year, yet still dirt cheap. With unrelenting demand, soaring 2022 earnings estimates, and $1.5 billion for repurchasing shares, retail investors could jump in at any time. This company could rival or surpass other recent Zacks’ Stocks Set to Double like Boston Beer Company which shot up +143.0% in little more than 9 months and NVIDIA which boomed +175.9% in one year.Free: See Our Top Stock and 4 Runners Up >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report RBB Bancorp (RBB): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research