SHANGHAI, CHINA - 2025/11/08: The Pfizer logo is presented at the 8th China International Import Expo. (Photo by Sheldon Cooper/SOPA Images/LightRocket via Getty Images)SOPA Images/LightRocket via Getty ImagesPfizer (PFE) is encountering threats. Even the most prominent names aren't immune. Stocks can decline sharply without any warning – erasing months or years of gains in just a few weeks. History indicates that unexpected market fluctuations can affect any company, regardless of its dominance.Pfizer’s sh ...