MEMX, an exchange operator and market technology provider, has announced a definitive agreement for TMX Group, a global provider of data, listing services, trading markets, and clearing facilities, to make a strategic investment in MEMX. BOX, a US equity options market, will be combined with MEMX, concurrent with this transaction, and TMX Group will have an approximately 59 percent ownership interest in the combined business. Under the terms of the agreement, this transaction will create a consolidated US exchange group with an enterprise value of approximately US$2.3 billion. TMX Group and minority equity holders are to be granted call and put rights respectively, starting three years post close. John McKenzie, CEO of TMX Group, adds: "Today we are pleased to announce a significant increase in our stake with the investment in MEMX.