Canada’s TMX Group will take control of a combined exchange entity following a merger between MEMX LLC and BOX [1, 2].
This transaction signals a significant shift in the North American trading landscape by consolidating two U.S.-based platforms under Canadian leadership. The move expands the global footprint of TMX Group while integrating equity and options market capabilities into a single operation.
MEMX LLC is an exchange operator backed by financial institutions including Jane Street and Morgan Stanley [1, 2]. Under the terms of the deal announced on July 31, 2026, MEMX will combine with the equity-options market BOX [1, 2]. The resulting merged exchange will be controlled by TMX Group, which serves as Canada’s leading stock exchange group [1, 2].
The merger is designed to create a larger, integrated exchange platform [1, 2]. By combining the assets and infrastructures of MEMX and BOX, the new entity aims to increase its competitive scale within the U.S. markets. The transition allows TMX Group to leverage its existing operational expertise to manage the combined U.S. entity, a strategic expansion of its market reach [1, 2].
Details regarding the specific financial terms of the transfer of control were not provided in the initial announcement. However, the structural change places the combined U.S. operations under the umbrella of the Canadian group [1, 2].
“The merger creates a larger, integrated exchange platform”
The acquisition of control over MEMX and BOX allows TMX Group to diversify its revenue streams and reduce its reliance on the Canadian domestic market. By controlling a merged US entity that combines equity and options trading, TMX Group positions itself as a major cross-border player in the high-frequency trading and institutional exchange space.
