The article directly mentions OpGen (OPGN) experiencing a decrease in stock price following a recent surge. This pullback is a common market reaction after a significant price movement, indicating a short-term negative impact on the stock. The high relevance score is due to the article focusing solely on OpGen, while the importance score reflects the significance of stock price movements to investors. The confidence level is high due to the clear cause-and-effect relationship between the recent surge and the pullback.