Kulicke and Soffa (KLIC) could be a solid addition to your portfolio given a notable revision in the company's earnings estimates. While the stock has been gaining lately, the trend might continue since its earnings outlook is still improving.The rising trend in estimate revisions, which is a result of growing analyst optimism on the earnings prospects of this semiconductor equipment maker, 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. This insight is at the core of our stock rating tool -- the Zacks Rank.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 Kulicke and Soffa, 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 company is expected to earn $2.04 per share for the current quarter, which represents a year-over-year change of +603.45%.The Zacks Consensus Estimate for Kulicke and Soffa has increased 82.44% 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 $6.03 per share represents a change of +534.74% from the year-ago number.In terms of estimate revisions, the trend for the current year also appears quite encouraging for Kulicke and Soffa. Over the past month, three estimates have moved higher compared to no negative revisions, helping the consensus estimate increase 28.23%.Favorable Zacks RankThanks to promising estimate revisions, Kulicke and Soffa currently carries 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 LineInvestors have been betting on Kulicke and Soffa because of its solid estimate revisions, as evident from the stock's 22.4% gain over the past four weeks. As its earnings growth prospects might push the stock higher, you may consider adding it to your portfolio right away. Time to Invest in Legal Marijuana If you’re looking for big gains, there couldn’t be a better time to get in on a young industry primed to skyrocket from $17.7 billion back in 2019 to an expected $73.6 billion by 2027. After a clean sweep of 6 election referendums in 5 states, pot is now legal in 36 states plus D.C. Federal legalization is expected soon and that could be a still greater bonanza for investors. Even before the latest wave of legalization, Zacks Investment Research has recommended pot stocks that have shot up as high as +285.9%. You’re invited to check out Zacks’ Marijuana Moneymakers: An Investor’s Guide. It features a timely Watch List of pot stocks and ETFs with exceptional growth potential.Today, Download Marijuana Moneymakers FREE >>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 Kulicke and Soffa Industries, Inc. (KLIC): Free Stock Analysis Report To read this article on Zacks.com click here.