Dozens of stocks more than doubled in the first half of this year. Most of them won't repeat the feat through the final six months of 2023, and many of them might surrender some of their sizable year-to-date gains. Let's single out a few names that could double again in the second half. 

Carnival Corp. (NYSE: CCL), Royal Caribbean (NYSE: RCL), and Duolingo (NASDAQ: DUOL) have delivered wealth-altering gains so far this year. They have all more than doubled, but the upticks don't have to end there. Let's take a closer look. 

They say that first impressions matter, but sometimes Wall Street holds out for a second opinion. Carnival stock tumbled 8% last Monday after posting seemingly reasonable quarterly results that morning. The stock would go on to soar 29% during the final four trading days of the week after investors began to appreciate the blowout performance. 

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Source Fool.com