Mario Gabelli acquired 280 Thousand Otter Tail shares worth $23.9 Million. That's 0.26% of their equity portfolio (102nd largest holding). The first Otter Tail trade was made in Q2 2002. Since then Mario Gabelli bought shares 31 more times and sold shares on 31 occasions. The stake costed the investor $7.6 Million, netting the investor a gain of 215% so far.