Toronto Stock Exchange, TSX Venture Exchange, Montreal Exchange, TMX Select and Alpha will be closed on Monday, May 20, 2013 for the Victoria Day holiday, TMX Group Ltd. said Monday.

Natural Gas Exchange will remain open for regular trading.

The exchanges will re-open for regular trading on Tuesday, May 21.

TMX Group’s (TSX:X) key subsidiaries operate cash and derivative markets and clearinghouses for multiple asset classes including equities, fixed income and energy.