Pfizer Inc. (PFE) shares are up 2.07% to $26.18 as of 3:58 pm on Monday, rising from the previous close of $25.65. The stock's upward movement comes amid a significant increase in institutional investment, as Qsemble Capital Management LP boosted its stake in Pfizer by 178.7% during the third quarter, now holding 185,882 shares valued at $5,379,000. This increase in holdings reflects growing confidence in Pfizer's potential, despite the recent FDA approval of BridgeBio Pharma's rival heart drug, Attruby, which could challenge Pfizer's Vyndaqel.