Valueworks LLC decreased its position in Mammoth Energy Services, Inc. (NASDAQ:TUSK – Free Report) by 0.3% in the 3rd quarter, Holdings Channel reports. The fund owned 3,374,263 shares of the energy company’s stock after selling 9,200 shares during the period. Mammoth Energy Services accounts for 5.7% of Valueworks LLC’s holdings, making the stock its 6th […]