Joel Greenblatt acquired 8.65 Thousand Proto Labs shares worth $272 Thousand. That's 0.00% of their equity portfolio (1124th largest holding). The first Proto Labs trade was made in Q4 2013. Since then Joel Greenblatt bought shares six more times and sold shares on five occasions. The stake costed the investor $259 Thousand, netting the investor a gain of 5.1% so far.