Organigram Holdings Inc. OGI, -2.75% said Monday that Chief Executive Greg Engel is stepping down from his role effective today and will act as special adviser to the board through a transition period. The Moncton, New Brunswick-based cannabis company said Peter Amirault, currently chairman of the board, will act as executive chair on an interim basis until a new permanent CEO has been appointed. Shares were down 0.9% premarket but have gained 99.6% in the year to date, while the Cannabis ETF THCX, -0.81% has gained 47% and the S&P 500 SPX, -0.72% has gained 11%.