Joel Greenblatt acquired 193 Thousand Microsoft shares worth $81.5 Million. That's 1.25% of their equity portfolio (6th largest holding). The first Microsoft trade was made in Q4 2010. Since then Joel Greenblatt bought shares 23 more times and sold shares on 28 occasions. The stake costed the investor $20.8 Million, netting the investor a gain of 291% so far.