Ken Griffin's position in Penumbra is currently worth $218 Million. That's 0.22% of their equity portfolio (91st largest holding). The investor owns 1.90% of the outstanding Penumbra stock. The first Penumbra trade was made in Q3 2015. Since then Ken Griffin bought shares 49 more times and sold shares on 39 occasions. The stake costed the investor $144 Million, netting the investor a gain of 51% so far.