Chuck Royce acquired 1.27 Million Mammoth Energy Services shares worth $4.78 Million. That's 0.04% of their equity portfolio (481st largest holding). The investor owns 2.66% of the outstanding Mammoth Energy Services stock. The first Mammoth Energy Services trade was made in Q1 2017. Since then Chuck Royce bought shares fourteen more times and sold shares on eight occasions. The stake costed the investor $4.1 Million, netting the investor a gain of 17% so far.