Ken Griffin acquired 41.8 Thousand Perma-Fix Environmental Services shares worth $471 Thousand. That's 0.00% of their equity portfolio (3447th largest holding). The first Perma-Fix Environmental Services trade was made in Q1 2017. Since then Ken Griffin bought shares five more times and sold shares on five occasions. The stake costed the investor $328 Thousand, netting the investor a gain of 44% so far.