Florida Republicans pick a nominee for governor on August 18, 2026, and the Florida Governor Republican Primary 2026 board has priced the result as close to settled. Byron Donalds, endorsed by Donald Trump in February 2025 and sitting on a $103M war chest, is the chalk against a certified ballot of eleven Republicans. Roughly $49.8M in cumulative volume has moved across Kalshi and Polymarket, up nearly six-fold since late June. The live board above carries the current price on every contract.
Florida Republicans settle their nominee for governor on Tuesday, August 18, 2026, and the Florida Governor Republican Primary 2026 board has spent the closing weeks pricing the result as a formality. Byron Donalds trades in the high 90s on both Kalshi and Polymarket, and no other name on the board has printed above a cent. The board now carries roughly $49.8M in cumulative volume, close to six times the $8.5M it held in late June, and $7.8M of that changed hands in the past day. The live board above ranks every contract. What follows is why the price sits where it does, who the real challengers are, and how the market settles.
Donalds is the chalk and the gap is structural. Trump endorsed the congressman from Florida's 19th District in February 2025, before Donalds had formally declared, and no rival ever pried that endorsement loose. The money followed. Donalds cleared $103M raised as of July 17, 2026, with more than $92M of it sitting in the Friends of Byron Donalds political committee and the balance in the campaign account. Ken Griffin wrote a single $10M check in late July, the largest contribution recorded in the race, and Jeff Yass added $7.5M in March. The Associated Press calls the financial advantage over the rest of the field overwhelming, and the board has agreed all summer.
The number that actually explains the price is not a poll. It is a rule. Florida abolished the runoff primary in 2005, when Jeb Bush signed the repeal, and a 2026 bill to bring second primaries back was pulled before its first House hearing. Whoever gets the most votes on Tuesday is the nominee, majority or not. That is how Donalds sits in the high 90s while Decision Desk HQ's polling average has him at 37%. In a runoff state, 37% against a field that consolidates behind one alternative is a live race. In Florida, it is a 19-point lead over the nearest rival and a nomination.
What remains uncertain is the winning share, not the winner. That is where the real trading question lives, and it has its own board: the FL Republican Governor Primary vote-percent market carries $4.9M of its own volume on how far above or below 50% Donalds finishes.
Decision Desk HQ's polling average puts investor James Fishback at 18%, Lt. Gov. Jay Collins at 17%, and former state House Speaker Paul Renner at 8%. The underlying surveys disagree sharply with each other. Four recent polls put Donalds near 50%, two put him in the low 30s, and the Public Sentinel Institute had the race at 31% to 28% over Fishback. The winner board resolved that disagreement in one direction weeks ago and has not moved since.
Fishback, who founded the investment firm Azoria, is the reason this primary produced litigation instead of a debate. Collins sued to strike him from the ballot, arguing that a 2020 vote cast in Washington and a 2021 apartment purchase there broke the seven-year residency requirement in Florida's constitution. Leon County Circuit Judge David Frank denied the challenge on July 27, 2026, finding that Collins had not overcome the state's presumptions favoring continued residency and ballot access, and ordering that Fishback "shall remain qualified." Fishback's contract has since become the most heavily traded name on the entire board at roughly $29.9M in lifetime volume, more than Donalds and Collins combined, because the disqualification storyline gave traders a binary the horse race never offered.
Collins is the DeSantis-lane candidate without the DeSantis endorsement. The governor appointed him lieutenant governor in 2025 and has been openly critical of Donalds, yet he never endorsed his own second-in-command. That missing endorsement is the cleanest explanation for why the establishment alternative never climbed out of the high teens. Renner runs fourth in the same lane on the same problem.
The bottom of the board deserves a note, because several names on it never appeared on the certified ballot. Casey DeSantis never entered the race; Ron DeSantis put her interest at "zero" and she never filed. Wilton Simpson filed for a second term as Agriculture Commissioner instead. Jimmy Patronis went to Congress after winning the Florida 1st District special election. Matt Gaetz never ran. Their contracts remain listed on Kalshi and still print 0c, which is the market doing exactly what it should: eleven Republicans qualified for Tuesday's ballot, and the names parked at the bottom of the board are not among them.
The market resolves with Florida's Republican gubernatorial primary on August 18, 2026. Polls close at 7 p.m. local time, which is 7 p.m. ET across most of the state and 8 p.m. ET in the Central-time Panhandle counties. Florida holds no runoff, so the candidate with the most votes becomes the nominee whether or not the share clears 50%. Settlement is to the candidate certified as the Republican nominee, taken from the first official announcement of results, with the Florida Division of Elections returns serving as the public record. Each candidate contract pays $1 per share if that candidate wins the nomination; every other contract settles at $0.
The winner contract is the least uncertain thing on the Florida board, which makes the neighbors more interesting than the headline. Traders pricing how convincing the win is can work the Florida Republican Governor Primary margin of victory, and anyone looking past Tuesday can trade whether Republicans hold the Florida governorship in 2026, where David Jolly and Jerry Demings on the Democratic side turn an open seat into a real November contest. For the other marquee open-seat governor race of the cycle, the 2026 California Governor race odds carry even more volume than Florida. The full slate of 2026 races, candidates, and resolution dates lives on the politics prediction markets hub.
Resolves to the candidate certified as the Republican nominee in Florida’s gubernatorial primary on August 18, 2026. Polls close at 7 p.m. local time, 7 p.m. ET in most of the state and 8 p.m. ET in the Central-time Panhandle counties. Florida holds no runoff primary, so the candidate receiving the most votes becomes the nominee whether or not that share reaches 50%. The source of truth is the first official announcement of results, with certified Florida Division of Elections returns as the public record, though an overwhelming consensus of credible reporting may suffice. Each candidate contract pays $1 per share if that candidate wins the nomination; all other contracts settle at $0. If no 2026 Florida Republican gubernatorial primary is held, the market resolves to "Other" under platform-specific rules.
Byron Donalds trades in the high 90s on both Kalshi and Polymarket, with every other Republican in the low single digits or at zero. The board carries roughly $49.8M in cumulative volume and traded $7.8M in the past 24 hours, and the live board above shows the current price on all nine listed contracts.
It resolves with Florida’s Republican gubernatorial primary on Tuesday, August 18, 2026. Polls close at 7 p.m. ET across most of the state and 8 p.m. ET in the Central-time Panhandle counties, and settlement follows the first official certification of the nominee.
Both exchanges list the race. Kalshi runs it under the KXGOVFLNOMR series and Polymarket lists per-candidate contracts under its Republican Nominee for Florida Governor event, so the live board above pairs the same names across both books.
As of August 17, 2026, Byron Donalds is the favorite at 99c on both Kalshi and Polymarket, with James Fishback next at 1c and the rest of the field at 0c. Donalds has held Trump’s endorsement since February 2025 and raised more than $103M through his campaign and allied political committee.
Watch August turnout and whether Donalds clears 50%, since Florida has no runoff and the winning share is the only genuinely open question left. Decision Desk HQ’s average has him at 37% while several individual polls put him near 50%, and that gap is what the vote-percent and margin markets are actually pricing.