The Toronto Stock Exchange - or TSX - is one of the largest stock exchanges in the world. With Canada housing extensive natural resources, the TSX is the single most important exchange for a natural resource focused companies engaged in energy or other commodity markets. This duty is not mandatory. The main directors' duties under Canadian corporate law is the duty of care, and then avoiding conflicts of interest, which include primarily of engaging in undisclosed self-dealing, taking unauthorized corporate opportunities, competing with the company, and being enriched in a takeover bid.