Popular (BPOP) appears an attractive pick given a noticeable improvement in the company's earnings outlook. The stock has been a strong performer lately, and the momentum might continue with analysts still raising their earnings estimates for the company.The upward trend in estimate revisions for this company that runs Banco Popular and other banks in Puerto Rico and the U.S. Reflects growing optimism of analysts on its earnings prospects, which should get reflected in its stock price. After all, empirical research shows a strong correlation between trends in earnings estimate revisions and near-term stock price movements. Our stock rating tool -- the Zacks Rank -- has this insight at its core.The five-grade Zacks Rank system, which ranges from a Zacks Rank #1 (Strong Buy) to a Zacks Rank #5 (Strong Sell), has an impressive externally-audited track record of outperformance, with Zacks #1 Ranked stocks generating an average annual return of +25% since 2008.For Popular, there has been strong agreement among the covering analysts in raising earnings estimates, which has helped push consensus estimates considerably higher for the next quarter and full year.The chart below shows the evolution of forward 12-month Zacks Consensus EPS estimate:12 Month EPSCurrent-Quarter Estimate RevisionsThe earnings estimate of $1.78 per share for the current quarter represents a change of +3.49% from the number reported a year ago.The Zacks Consensus Estimate for Popular has increased 44.72% over the last 30 days, as one estimate has gone higher compared to no negative revisions.Current-Year Estimate RevisionsFor the full year, the earnings estimate of $5.65 per share represents a change of -17.88% from the year-ago number.In terms of estimate revisions, the trend for the current year also appears quite encouraging for Popular. Over the past month, one estimate has moved higher compared to no negative revisions, helping the consensus estimate increase 34.85%.Favorable Zacks RankThe promising estimate revisions have helped Popular earn a Zacks Rank #1 (Strong Buy). The Zacks Rank is a tried-and-tested rating tool that helps investors effectively harness the power of earnings estimate revisions and make the right investment decision. You can see the complete list of today's Zacks #1 Rank (Strong Buy) stocks here.Our research shows that stocks with Zacks Rank #1 (Strong Buy) and 2 (Buy) significantly outperform the S&P 500.Bottom LinePopular shares have added 11.1% over the past four weeks, suggesting that investors are betting on its impressive estimate revisions. So, you may consider adding it to your portfolio right away to benefit from its earnings growth prospects.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 Popular, Inc. (BPOP): Free Stock Analysis Report To read this article on Zacks.com click here.