Ken Griffin acquired 56.6 Thousand Repligen shares worth $9.38 Million. That's 0.01% of their equity portfolio (1155th largest holding). The first Repligen trade was made in Q2 2013. Since then Ken Griffin bought shares 48 more times and sold shares on 47 occasions. The stake costed the investor $9.24 Million, netting the investor a gain of 1.4% so far.