Infiniti Intelligence Hourly Briefing — Oct 16, 2026 · 12:39 AM ET

September volume reaches $20.1B

Prediction-market taker volume totaled $20.1B in September, up 1,079% year over year, according to Gambling Insider’s account of Macquarie’s Oct. 9 note.

Macquarie put Kalshi’s share of September taker volume at 67%. That places the platform at roughly two-thirds of the reported monthly total.

Sports dominate the reported activity

Sports contracts accounted for about $17B of September taker volume, according to the figures reported by Gambling Insider. Against the $20.1B total, that makes sports the dominant category in the monthly breakdown.

Macquarie also forecast U.S. taker volume of $186.8B for 2026. That is a full-year projection, distinct from the reported September activity.

What it means for prediction markets

• Platform concentration: Kalshi’s 67% share makes its activity central to understanding the September volume figures.
• Category concentration: With about $17B attributed to sports contracts, the headline total should not be treated as evidence of equally strong activity across other categories.
• Forecast versus results: The $186.8B U.S. estimate represents Macquarie’s outlook for 2026, not completed annual volume.

Alabama–Tennessee pricing narrows

Alabama’s spread moved to -7.5 at 50% on Polymarket, while the game total fell to 50.5, according to the supplied market update. The snapshot was published Oct 16, 2026 · 12:39 AM ET.

The summary describes the prices as a Thursday-afternoon update. It also reports no significant new platform headline during the preceding 15 minutes, leaving the pricing movement as the focus rather than a fresh news catalyst.

The update characterizes the spread as tightening and the total as declining, but provides neither earlier levels nor trading volume. That limits any assessment of the size or significance of either move.

There is also a source mismatch: the supplied excerpt from rockytopinsider.com concerns Tennessee basketball’s preseason loss to Xavier and its struggles in the final 20 minutes, rather than Alabama–Tennessee odds. It therefore does not independently substantiate the market figures in the headline.

What it means for prediction markets

• The 50% figure belongs to the Alabama -7.5 spread position. It should not be read as Alabama’s probability of winning outright.
• The total is now 50.5, but no probability for either side of that line is supplied.
• The evidence supports only a limited market read: the reported direction is a tighter spread and a lower total; earlier prices, volume and a supporting odds report are absent.