Mario Gabelli acquired 134 Thousand Microsoft shares worth $56.6 Million. That's 0.58% of their equity portfolio (37th largest holding). The first Microsoft trade was made in Q1 2001. Since then Mario Gabelli bought shares 29 more times and sold shares on 59 occasions. The stake costed the investor $3.88 Million, netting the investor a gain of 1357% so far.