New York (CNN Business) White Claw is America's top-selling hard seltzer, but industry analysts expect rival spiked seltzer brands will soon chip away at its dominance.

One to watch is Truly, which is Boston Beer's version of White Claw. Analysts at Guggenheim forecast sales of the alcoholic drink to grow three-fold over the next two years, according to a new report released Monday.

Truly sales will help bolster Boston Beer's bottom line so much that the analysts have raised its earnings estimates for the next three years. That's welcome news for investors: Guggenheim analysts said its beer brands, such as Samuel Adams and Dogfish Head, are "performing below what we expected."

Boston Beer's SAM stock rose 4% Monday and is now up nearly 50% for the year. Guggenheim raised its share price target to $462 from $449 per share.

White Claw is the industry leader, commanding 58% of spiked seltzer sales, according to Guggenheim. The brand has been the drink of the summer, sparking memes, social media affection and even a shortage because of its distribution practices.

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