Groupon's 15min chart shows Bollinger Bands Narrowing and Bearish Marubozu signal.

Based on the 15-minute chart of Groupon, the recent trading activity has triggered a narrowing of Bollinger Bands and a bearish Marubozu pattern. This indicates a decrease in the magnitude of stock price fluctuations, suggesting that sellers are currently in control of the market. As a result, it is likely that bearish momentum will continue in the near future.