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TMX Group Is Betting $800 Million That MEMX Can Crack U.S. Equity Markets Before the Window Closes
MEMX processed 77 million equity trades on Tuesday, August 5, representing 2.8% of consolidated U.S. volume. NYSE handled 1.1 billion. The scale gap is absurd on its face, which is why TMX Group's $800 million acquisition of a majority stake in the upstart exchange looks less like market dominance and more like infrastructure arbitrage, buying into a platform built by the firms that actually make U.S. equity markets run.
MEMX was founded in 2019 by Citadel Securities, Virtu Financial, and Charles Schwab, the three entities responsible for routing, executing, or facilitating the majority of retail equity flow in North America. They didn't build it to compete with the NYSE on prestige. They built it to undercut exchange fees and strip out the rent-seeking layers that accumulate when two operators control 70% of lit-market volume. TMX isn't buying market share. It's buying the blueprint.
The data business dressed as an exchange
TMX's prior U.S. move was VettaFi, the index and data provider it bought for $1.1 billion in early 2024. That deal signaled the pivot: trading volume generates low-margin revenue, but the data exhaust from that volume, tick data, analytics, benchmarking feeds, carries gross margins above 60%. MEMX gives TMX both. The exchange itself breaks even or slightly better. The real asset is the technology stack and the data licensing model that comes with it.
Global exchange operators figured this out a decade ago. London Stock Exchange Group now derives more revenue from data and analytics than from trading. Intercontinental Exchange, owner of the NYSE, makes more from fixed income data services than from equity listings. TMX was late to the realization, constrained by a domestic market where the TSX's dominance in Canadian equities left little competitive pressure to innovate. The resource-heavy composition of the TSX, energy, materials, financials, meant fewer high-frequency participants and less demand for low-latency infrastructure. MEMX solves that by dropping TMX into the center of the highest-velocity equity ecosystem on the planet.
Why the regulatory path matters
Cross-border ownership of U.S. exchange infrastructure requires SEC approval, and the agency has historically been skeptical of foreign control over critical market plumbing. TMX will argue that MEMX's original backers, market makers with global operations, remain invested, preserving alignment with U.S. market participants. The counterargument is that a Canadian entity controlling even a small percentage of U.S. equity flow creates a data sovereignty issue, particularly if TMX routes order data through non-U.S. servers or integrates MEMX's infrastructure with its Toronto operations.
The approval timeline will stretch into 2027. If the SEC imposes structural limits, say, capping TMX's ownership below 50%, or requiring that all MEMX data remain domiciled in the U.S., the deal's economics tilt. TMX is betting that regulators view MEMX as a competitive good, not a national asset, because its 2.8% share poses no systemic risk.
The options wedge
MEMX launched options trading in late 2022 and has since captured roughly 4% of U.S. options volume, a higher share than its equity business. Retail interest in options has exploded since 2020, driven by zero-commission brokerage apps and the gamification of short-dated contracts. The Options Clearing Corporation reported a record 11.2 billion contracts traded in 2025, up from 9.6 billion in 2023. MEMX's low-fee model appeals to the high-frequency retail flow that now dominates single-stock options.
TMX has no comparable product in Canada. The Montreal Exchange handles Canadian derivatives, but the notional volume is a fraction of U.S. levels. Acquiring a foothold in U.S. options gives TMX exposure to the fastest-growing segment of North American trading without building from scratch.
The consolidation endgame
TMX is aiming for more than half of its revenue to originate outside Canada by 2028. VettaFi and MEMX together represent about $1.9 billion in deployed capital, nearly double TMX's 2023 operating cash flow. The company is borrowing against the stability of its Canadian operations, steady TSX listings revenue, predictable clearing fees, to buy into higher-growth, lower-certainty U.S. businesses.
If MEMX's market share stagnates or the SEC forces structural concessions, TMX will own an expensive but subscale platform in the most competitive exchange market in the world. If MEMX holds its share and expands in options, TMX gets a data engine and a technology transfer it can monetize across its entire portfolio. The $800 million isn't the cost of the bet. It's the cost of not being left with only Canada.
MEMX processed 77 million equity trades on Tuesday, August 5, representing 2.8% of consolidated U.S. volume. NYSE handled 1.1 billion. The scale gap is absurd on its face, which is why TMX Group's $800 million acquisition of a majority stake in the upstart exchange looks less like market dominance and more like infrastructure arbitrage, buying into a platform built by the firms that actually make U.S. equity markets run.
MEMX was founded in 2019 by Citadel Securities, Virtu Financial, and Charles Schwab, the three entities responsible for routing, executing, or facilitating the majority of retail equity flow in North America. They didn't build it to compete with the NYSE on prestige. They built it to undercut exchange fees and strip out the rent-seeking layers that accumulate when two operators control 70% of lit-market volume. TMX isn't buying market share. It's buying the blueprint.
The data business dressed as an exchange
TMX's prior U.S. move was VettaFi, the index and data provider it bought for $1.1 billion in early 2024. That deal signaled the pivot: trading volume generates low-margin revenue, but the data exhaust from that volume, tick data, analytics, benchmarking feeds, carries gross margins above 60%. MEMX gives TMX both. The exchange itself breaks even or slightly better. The real asset is the technology stack and the data licensing model that comes with it.
Global exchange operators figured this out a decade ago. London Stock Exchange Group now derives more revenue from data and analytics than from trading. Intercontinental Exchange, owner of the NYSE, makes more from fixed income data services than from equity listings. TMX was late to the realization, constrained by a domestic market where the TSX's dominance in Canadian equities left little competitive pressure to innovate. The resource-heavy composition of the TSX, energy, materials, financials, meant fewer high-frequency participants and less demand for low-latency infrastructure. MEMX solves that by dropping TMX into the center of the highest-velocity equity ecosystem on the planet.
Why the regulatory path matters
Cross-border ownership of U.S. exchange infrastructure requires SEC approval, and the agency has historically been skeptical of foreign control over critical market plumbing. TMX will argue that MEMX's original backers, market makers with global operations, remain invested, preserving alignment with U.S. market participants. The counterargument is that a Canadian entity controlling even a small percentage of U.S. equity flow creates a data sovereignty issue, particularly if TMX routes order data through non-U.S. servers or integrates MEMX's infrastructure with its Toronto operations.
The approval timeline will stretch into 2027. If the SEC imposes structural limits, say, capping TMX's ownership below 50%, or requiring that all MEMX data remain domiciled in the U.S., the deal's economics tilt. TMX is betting that regulators view MEMX as a competitive good, not a national asset, because its 2.8% share poses no systemic risk.
The options wedge
MEMX launched options trading in late 2022 and has since captured roughly 4% of U.S. options volume, a higher share than its equity business. Retail interest in options has exploded since 2020, driven by zero-commission brokerage apps and the gamification of short-dated contracts. The Options Clearing Corporation reported a record 11.2 billion contracts traded in 2025, up from 9.6 billion in 2023. MEMX's low-fee model appeals to the high-frequency retail flow that now dominates single-stock options.
TMX has no comparable product in Canada. The Montreal Exchange handles Canadian derivatives, but the notional volume is a fraction of U.S. levels. Acquiring a foothold in U.S. options gives TMX exposure to the fastest-growing segment of North American trading without building from scratch.
The consolidation endgame
TMX is aiming for more than half of its revenue to originate outside Canada by 2028. VettaFi and MEMX together represent about $1.9 billion in deployed capital, nearly double TMX's 2023 operating cash flow. The company is borrowing against the stability of its Canadian operations, steady TSX listings revenue, predictable clearing fees, to buy into higher-growth, lower-certainty U.S. businesses.
If MEMX's market share stagnates or the SEC forces structural concessions, TMX will own an expensive but subscale platform in the most competitive exchange market in the world. If MEMX holds its share and expands in options, TMX gets a data engine and a technology transfer it can monetize across its entire portfolio. The $800 million isn't the cost of the bet. It's the cost of not being left with only Canada.
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