We recently published 10 Stocks Struggling to Shine Ahead of Christmas. Ambev SA (NYSE:ABEV) is one of the worst performers on Monday. Ambev dropped its share prices by 7.63 percent to close at $2.30 apiece amid the lack of catalysts to boost buying appetite and what appeared to be an early window-dressing. The practice is common among institutional investors, where they tweak portfolios before the reporting periods, typically quarterly and annually, by loading up on well-performing stocks and trimming ...