Mario Gabelli acquired 6.9k Costco Wholesale shares worth $6.61M. That's 0.06% of their equity portfolio (307th largest holding). The first Costco Wholesale trade was made in Q3 2004. Since then Mario Gabelli bought shares 34 more times and sold shares on 49 occasions. The stake costed the investor $398k, netting the investor a gain of 1559% so far.