Mario Gabelli acquired 533 Thousand Pfizer shares worth $15 Million. That's 0.16% of their equity portfolio (160th largest holding). The first Pfizer trade was made in Q1 2001. Since then Mario Gabelli bought shares 28 more times and sold shares on 61 occasions. The stake costed the investor $11.2 Million, netting the investor a gain of 35% so far.