UFC Champion Odds: Who Holds Every Belt On December 31?

The Quick Answer

Kalshi lists a "who holds the belt on December 31" market for all eight men's UFC divisions, and the three deepest boards say the year mostly ends the way it sits today. Justin Gaethje trades at 81 to 82 cents (roughly an 81.5% implied probability) to still be lightweight champion, Carlos Ulberg trades at 89 to 90 cents at light heavyweight, and heavyweight is the only genuine coin flip among the deep boards: Tom Aspinall around 46% and Ciryl Gane around 43.5% ahead of a unification rematch both men have agreed to but the UFC has not yet officially booked. One scope note up front: Kalshi lists the eight men's belts only, so the Mackenzie Dern vs. Gillian Robertson women's strawweight title fight on that same UFC 330 card this Saturday has no board of its own. Every price in this article is a live Kalshi quote pulled on August 13, 2026. The full eight-belt board, the strangest 3-cent price in MMA, and how a DFS player should read all of it are below.

What these UFC champion odds are actually testing is not striking differentials or takedown defense. The three biggest belt markets on Kalshi are calendar bets. Two of those champions are effectively off the calendar, one recovering from ACL surgery and one saying he will not fight again this year, so their contracts price the odds that nothing happens, not the odds that they win a fight. Only one of those three divisions has a live title-fight path between now and New Year's, and that is where all the genuine handicapping lives. If you play MMA DFS, this is a familiar skill: before you evaluate anyone's skills, you confirm who is actually competing. The same first-check habit that keeps a scratched fighter out of your lineups is the entire edge on this board. Keep that frame; every strange number below makes sense once you have it.

Lightweight: Gaethje's 81% Is A Calendar Read

The lightweight title market is the most-traded UFC board on Kalshi at roughly 607,000 contracts of reported volume (a soft number on that exchange, so treat the 1-cent bid-ask spread on Gaethje as the better depth signal), and it prices Justin Gaethje as a heavy favorite to be the champion standing on December 31.

The row that explains the whole table is Gaethje's. He took the belt from Ilia Topuria in June at the White House card via a corner-stoppage TKO after the fourth round, one of the biggest upsets the sport has produced, and he came out of it with a medical suspension that can run as long as 180 days. Even the full term expires around December 11, so what the 81 cents is really pricing is his own public timeline: he has said he does not expect to fight again in 2026. No defense means no way to lose it in the cage, which is why a champion who won as a big underdog in his last fight trades north of 80 cents here. Oliveira and Tsarukyan at 5 to 7 cents are not really bets on those fighters winning anything; they are bets on chaos, a stripped or vacated belt plus a booked-and-won title fight inside four and a half months. That is a parlay of administrative events, and the market prices it like one.

Light Heavyweight: An ACL Sets The Price

The lightweight logic gets even cleaner up at 205, because at light heavyweight the calendar is not a choice, it is an injury report. Carlos Ulberg knocked out Jiří Procházka in the first round at UFC 327 in April to win the belt, tore his ACL in that same fight, and had surgery days later. He is expected to miss the rest of 2026.

At 89 to 90 cents, Ulberg is the purest holder-by-default price on the board. The interesting row is Magomed Ankalaev at 7 to 8 cents. For that contract to pay, the recognized belt has to change hands by New Year's, which with Ulberg unable to fight means a stripped or vacated title and Ankalaev claiming the gold that counts. The UFC has openly floated an interim title fight, but an interim strap alone does not obviously satisfy a market written on the division's title holder, so read the contract rules before treating 8 cents as simple interim-fight odds. Alex Pereira sits on both this board and the heavyweight one because he vacated this belt in February to move up in weight, which is how Ulberg and Procházka ended up fighting for the vacant title in April; at 1 to 3 cents on each board, neither contract prices him as a live path back to gold this year. And one caution before you touch the cheap seats: Khalil Rountree Jr. shows a 0-cent bid against a 6-cent ask. That is a displayed market, not a real quote with a bid behind it, and on books this thin the honest read is the bid-ask range, not the last trade.

Heavyweight: The Only Real Fight On The Board

Heavyweight is the one division where you are handicapping an actual fight rather than a calendar. Aspinall holds the undisputed belt, Gane won the interim title at the June White House card, and Aspinall has accepted a unification rematch targeted for the UFC's September return to Paris, though the booking is not yet official. Their first meeting in October 2025 ended in a no contest on an eye poke, so the market is pricing a rematch with real residual uncertainty.

Aspinall and Gane combine for close to 90 cents of mid-price, which says traders are near-certain the belt ends the year on one of these two men, but the fight-probability signal hides in Gane's side alone. Gane can only be the holder on December 31 by fighting Aspinall and winning, so his 43.5 cents is a joint price on the rematch happening and him taking it; if you make that fight anything close to a coin flip, the number only works if the fight itself is nearly certain to land before New Year's. And then there is the strangest price on the board: Josh Hokit at a 2-cent bid and 4-cent ask, ahead of Jon Jones. There is no fight-logic story here, just a few points of longshot order flow propping up a displayed price on a thin tail. The Rountree read applies again: the book behind a number decides how seriously the number deserves to be taken.

The Other Five Belts On Kalshi

The board does not stop at three divisions. Kalshi prices all eight men's UFC belts, roughly 1.9 million contracts of reported volume in total, with nearly 1.2 million concentrated in the three markets above. Note the scope: Kalshi's belt markets cover the eight men's divisions only, with no women's title markets listed. The rest of the UFC title odds picture, by current market leader:

Every leader in that table is the sitting champion, which makes the prices themselves the story. Welterweight is the near-term one to watch: Makhachev defends against Ian Machado Garry at UFC 330 in Philadelphia on August 15, so that 75-cent price gets its biggest test within days. Flyweight and featherweight are the live coin flips, incumbents priced within a point or two of even: Van already has his rematch with Pantoja booked for September, and Evloev's 40-cent contract carries nearly as much weight as Volkanovski's. The difference between those coin flips and Ulberg's 90 cents is not fighter quality, it is that these belts will actually be contested before year-end. And featherweight carries the best thin-book lesson on the entire board: Youssef Zalal's contract shows a last trade of 91 cents sitting on a 0-cent bid and 1-cent ask. The last print is a fossil; the book is the truth.

From Contract Price To Implied Probability: A Worked Example

Everything above leans on one conversion, so here it is in full. Each lightweight contract settles on Kalshi's own rule language: if the fighter "is the UFC Lightweight Title Holder on Dec 31, 2026 at 12:00 PM ET," the market resolves Yes, and the other divisions' rules carry the same December 31 snapshot. Noon Eastern on New Year's Eve, not midnight, is the cutoff. A Kalshi contract pays $1 when it resolves Yes, so the price in cents is the market's implied probability: Gaethje at 82 cents on the ask means buyers are paying an 82% chance. Take Ulberg as the worked case. Buy 100 contracts at 90 cents and you risk $90 to win $10, a payout profile that only makes sense if his true hold probability clears 90% once you account for trading fees. Fees shift your effective odds the same way rake shifts a DFS contest, a comparison we priced out in Kalshi fees vs DFS rake. One eligibility note: Kalshi is a CFTC-regulated exchange open to US traders 18 and older. Also note the sum of the asks across a division runs over 100%, from a couple of points on the tight boards to nearly ten at light heavyweight once thin tail asks like Rountree's 6 cents pile up. That overround is the market's spread, and it is why we quote bid and ask rather than pretending one number is fair, the same discipline we use turning Kalshi prices into projections.

The MMA DFS Bridge: A Belt Market Is A Chain Of Fights

For anyone who builds MMA DFS lineups, the fee math is the familiar part, and the rest of the board rewards a decomposition you already know. Stokastic MMA Sims price one fight at a time to a fair moneyline; a belt market is a chain of those fights plus a schedule. Walk Ankalaev's 7 cents through the chain: a title bout has to exist before New Year's, which is a scheduling event; Ankalaev has to be the man booked into it, which is matchmaking; and he has to win it, which is the only link a fight model can actually price. Three gates, one fight. Seven cents is not a claim that Ankalaev is 7% to beat anyone; the calendar is doing most of the work, the same decomposition we apply when we read NBA championship odds against the Sims. We are not quoting Sims numbers on the belt markets themselves because we have not run them at this horizon; when our AI model panel weighs in on these boards, those verdicts land in a future refresh of this page, and every call gets graded in public on the Sims vs Kalshi ledger, our public scoreboard for exactly these markets.

The portfolio logic, though, transfers today. Ulberg at 89 cents is cash-game chalk, a high win probability with tiny upside and a brutal downside if the ACL timeline moves, while the single-digit challengers are GPP darts that need every gate in their chain to open, the exact ceiling-versus-floor trade-off you weigh in tournaments. Anyone playing the darts should size them in fractions of a unit and treat the wide-book tails as unplayable. On the fight-to-fight layer where the Sims actually live, UFC DFS strategy starts with the UFC DFS projections, ownership and stacks in the Stokastic DataHub, and you can try the Sims free to see the fair-moneyline layer these season-long markets chain together.

So the answer to the title question is mostly the boring one: as MMA prediction markets go, this board is priced for inertia. My own read is that nothing on the shelved boards pays you for information the calendar has not already priced, and the interesting homework all lives at heavyweight and featherweight. The champions who hold the belts today are priced to hold them on December 31, because two of the three deep markets are betting on a calendar with no title fights on it. What would reprice this board is not a training-camp rumor. It is an interim belt getting announced at light heavyweight, the Paris unification becoming official, or Gaethje's timeline moving. Watch the schedule, not the tape, and check the rest of our sports prediction markets coverage as the first domino falls at UFC 330 in Philadelphia on August 15.