Mario Gabelli acquired 44.3 Thousand O`Reilly Automotive shares worth $46.7 Million. That's 0.50% of their equity portfolio (49th 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 1369% so far.