2026 F1 Drivers' Champion

The 2026 drivers' title is close to decided and three separate venues say so with almost eerie precision: Kimi Antonelli at 74.2% on Polymarket, 74% on Kalshi, 73.9% on Manifold. Three-tenths of a point across a real-money book, a second real-money book and a play-money book.

Nobody is trading him. Antonelli took $1,891 of Polymarket's $78,470 and $1,729 of Kalshi's $17,781. Polymarket's deepest leg of the day is Oscar Piastri at 0.2%, which took $25,760—a third of the entire book. Kalshi prices Piastri at 1% and he took nothing at all.

Kalshi's standing money tells a third story. Its three largest open-interest positions are Lewis Hamilton at 13% with $685,443, Max Verstappen at 2% with $644,998, and Antonelli at 74% with $622,760. Roughly equal capital sits behind a 13% shot, a 2% shot and the champion-elect.

Where the venues genuinely disagree is Hamilton: 13% on Kalshi, 11.6% on Polymarket, 9.9% on Manifold. A three-point spread, and the widest gap in the field.

ProphetX certified Formula 1 futures contracts with the CFTC this week, which would make a fourth US venue listing this championship before the season closes.

The drivers' championship on both real-money venues. Polymarket's twenty-two legs sum to 98%; Kalshi's twenty-two sum to 118%. Read Kalshi's non-favorites as inflated by that overround before comparing them across.

The champion-elect's leg on each venue. 74.2% against 74%. Between them these two contracts took $3,620 in twenty-four hours—less than a seventh of what a single 0.2% leg took on Polymarket alone.

The two contracts absorbing the day's money. Piastri at 0.2% on Polymarket took $25,760, 33% of that venue's flow. Hamilton at 13% on Kalshi took $7,086, 40% of that venue's flow—and holds the largest open-interest position in the book at $685,443. Neither is the favorite.

The constructors' championship, where the pattern repeats exactly. Mercedes is 84% on Polymarket and 82% on Kalshi, and on both venues the deepest leg of the day is Ferrari at 15.3% and 14%—$4,277 and $1,656, more than Mercedes took on either.

Kalshi's constructor open interest is spread differently again: Ferrari $304,883, Red Bull $229,747 at 2%, Mercedes $204,162 at 82%.

Manifold's independent read and the widest disagreement in the field. Manifold has Antonelli at 73.9%—inside a point of both real-money venues—but Hamilton at 9.9% against Kalshi's 13%.

• A 74% favorite that three venues agree on and nobody trades is a solved market with an unsolved tail. All the interesting pricing in this championship is now in the 26% that is not Antonelli.
• $25,760 on a 0.2% Piastri leg is the single strangest number on this page. Kalshi prices the same driver at 1% and saw no volume at all. Either Polymarket's tail is being farmed or someone is paying up for a lottery ticket the other venue will not sell.
• Verstappen at 2% holding $644,998 of Kalshi open interest is a legacy position, not a live view. It is the second-largest in the book and it is on a driver the market has written off.
• Hamilton is the real disagreement: 13% / 11.6% / 9.9%. Three points across three venues on the only driver with a plausible path. If the gap closes, it will close toward whichever venue has the deeper book—which is Polymarket, at four times Kalshi's volume.
• ProphetX's F1 filing means a fourth venue. More venues on the same championship usually tightens the cross-exchange spread; watch whether Hamilton's three-point gap survives it.
• Ferrari takes the constructors' flow on both venues while Mercedes holds 82–84%. Same tail-heavy signature as the drivers' book, two markets down.