TMX and the LSE said that the competition watchdog, Melanie Aitken, has issued a letter to confirm she will not challenge the merger.
The issuance of the no action letter satisfies a condition of the merger agreement, dated 9 February 2011 that Competition Act (Canada) clearance be obtained.
However, the merger agreement still faces a bigger regulatory review by Industry Canada under the Investment Canada Act, which must determine whether the merger would be of net benefit to Canada.
After the deal completes, LSE is expected to take 55% of the enlarged company.
Earlier last month, TMX also received a rival $3.6bn takeover bid from Maple Group Acquisition, a consortium of nine Canadian pension funds and banks.
