Ken Griffin's position in Abiomed is currently worth $5.45 Million. That's 0.01% of their equity portfolio (1841st largest holding). The investor owns Inf% of the outstanding Abiomed stock. The first Abiomed trade was made in Q2 2013. Since then Ken Griffin bought shares 45 more times and sold shares on 39 occasions. The stake costed the investor $4.43 Million, netting the investor a gain of 23% so far.