Hillsdale Investment Management Inc. lessened its position in shares of Perma-Fix Environmental Services, Inc. (NASDAQ:PESI – Free Report) by 26.9% in the 4th quarter, HoldingsChannel reports. The institutional investor owned 9,251 shares of the industrial products company’s stock after selling 3,400 shares during the period. Hillsdale Investment Management Inc.’s holdings in Perma-Fix Environmental Services were […]