TMX Group Ltd, the owner of Canada's dominant stock exchange, said on Sunday it had not been removed from a major Canadian index run by S&P Global Inc despite what a spokesman said was an erroneous press release issued by S&P unit Capital IQ Inc that it had been removed.

S&P spokesman Soogyung Jordan confirmed TMX will remain in the S&P/TSX Composite Index.

"Earlier today, we were notified of an erroneous alert posted to the S&P Capital IQ platform regarding the continued inclusion of the TMX stock in the S&P/TSX composite. We have researched the issue, removed the alert from the platform and are in the process of notifying all clients who received the alert. TMX continues to be a constituent of the Composite," he wrote via email.