Boston Beer (NYSE: SAM) announced better-than-expected second-quarter 2017 results on Thursday after the market closed, highlighting a strong improvement in depletions trends, and increasing its full-year earnings guidance in the process. Shares of the craft brewer skyrocketed as much as 22% in early trading, and settled up around 15% as of 3:30 p.m. EDT as investors drank up the news.