Ken Griffin acquired 40.7 Thousand American Tower Corp. shares worth $9.95 Million. That's 0.01% of their equity portfolio (1198th largest holding). The first American Tower Corp. trade was made in Q2 2013. Since then Ken Griffin bought shares 39 more times and sold shares on 39 occasions. The stake costed the investor $5.01 Million, netting the investor a gain of 99% so far.