Mario Gabelli acquired 564k O`Reilly Automotive shares worth $49.4M. That's 0.45% of their equity portfolio (54th largest holding). The first O`Reilly Automotive trade was made in Q1 2011. Since then Mario Gabelli bought shares five more times and sold shares on 55 occasions. The stake costed the investor $2.82M, netting the investor a gain of 1654% so far.