Mario Gabelli acquired 5.28 Thousand AMGEN shares worth $1.4 Million. That's 0.01% of their equity portfolio (505th largest holding). The first AMGEN trade was made in Q1 2001. Since then Mario Gabelli bought shares 37 more times and sold shares on 45 occasions. The stake costed the investor $341 Thousand, netting the investor a gain of 312% so far.