The figures below come directly from iGaming Ontario's official quarterly market reports, aggregated from April 2022 through January 2026. All figures are in Canadian dollars. The full monthly dataset is available on the iGaming Ontario Market Reports page.

These are cumulative figures across the entire life of the market. Month to month, the sports betting share fluctuates meaningfully, typically between 18% and 28% depending on the sports calendar. The casino share is far more stable, rarely moving outside a 70-80% range. The hold rate analysis explains why sports betting GGR fluctuates while casino stays consistent.

Casino dominance in Ontario is not a quirk or an anomaly. It reflects fundamental differences between the two product types in terms of frequency, margin, and player psychology.

Frequency advantage

A slot machine spin takes three seconds. An NFL point spread resolves in about three hours. The frequency difference means casino products generate hundreds of revenue events per hour per player, while sports betting generates a handful. Even if a bettor spends the same amount of time on each product, casino generates dramatically more GGR per session.

Variance management

Slot RTPs (return-to-player rates) are certified by AGCO. A slot set to 94% RTP will, over millions of spins, return exactly 94% to players and keep 6% as the house edge. Sports betting has no equivalent certainty. If enough underdogs win in a month, the book's hold rate drops sharply. Casino revenue is predictable at scale. Sports betting revenue is not.

Player session length

Casino players, on average, play for longer uninterrupted sessions than sports bettors. Live casino tables in particular generate extended playtime. Sports betting is often episodic: place a bet before the game, check the result after. This session length difference amplifies the frequency advantage significantly.

Ontario sports betting generates roughly $2.45B in cumulative GGR since launch, which is a substantial number by any measure. It is the second-largest vertical and its share is growing. But its most important function in the market may be as an acquisition channel rather than a primary revenue driver.

Most Ontario bettors who sign up with a book first deposit to bet on sports. The NFL, NHL, NBA, and MLB create predictable, high-attention acquisition windows where books can market heavily and convert large numbers of new accounts. Once those accounts are registered, operators have the opportunity to cross-sell casino products, live dealer, and poker.

This is why all major Ontario books invest so heavily in sports betting product quality, NFL parlay promotions, and NHL in-play betting, even though those products generate less direct GGR than casino. The sports product is the front door. Casino is the living room.

The market share analysis explores how this dynamic affects which operators lead Ontario's overall revenue rankings. And you can explore which Ontario books offer the best sports betting experience at the Ontario sports betting hub.

The sports betting vertical's share of monthly GGR follows the sports calendar closely. Average wager volumes from the iGO dataset show a clear seasonal pattern:

During peak sports months (October through January), the sports betting share of GGR rises to roughly 25-28%. During the summer low (April through August), it drops to 18-20%. Casino GGR, by contrast, is notably more consistent month to month, declining only modestly in summer. This is why casino-strong operators have more predictable revenue than sports-first books.