According to the Toronto Stock Exchange, all trades on Wednesday, May 22, 2013, in the securities of AltaGas Ltd. that trade in U.S. dollars will be for special settlement on Tuesday, May 28, 2013. T-plus-four special settlement rules are being imposed for these securities to accommodate the U.S. banking holiday on Monday, May 27, 2013. Trading in the corresponding securities that trade in Canadian dollars (if applicable) will not be affected by these special settlement rules.