Mario Gabelli acquired 44.3 Thousand O`Reilly Automotive shares worth $48.4 Million. That's 0.51% of their equity portfolio (47th largest holding). The first O`Reilly Automotive trade was made in Q1 2011. Since then Mario Gabelli bought shares four more times and sold shares on 47 occasions. The stake costed the investor $3.18 Million, netting the investor a gain of 1422% so far.