--- title: "Mazzei's Narrow 0.6% Runoff Win Wipes Out High-Margin Bets in OK Gov Market" date: 2026-08-26T12:39:35.273276+00:00 category: Elections event_ticker: KXPRIMARYMOVD-GOVOKNOMR26MMAZ direction: drop change_pct: -67 price_before: 68.0% price_after: 1.0% anomaly_date: 2026-08-26 last_updated: 2026-08-26T12:39:35.273Z --- # Mazzei's Narrow 0.6% Runoff Win Wipes Out High-Margin Bets in OK Gov Market ## TL;DR The implied probability of Mike Mazzei winning the Oklahoma Republican gubernatorial runoff by a significant margin has collapsed, repricing expectations for the August 25, 2026 contest. Specifically, the implied probability of Mazzei winning by at least 6 percentage points fell by 67 percentage points, from 68% to 1%, after the narrow results were reported. This repricing was a direct consequence of the certified election results, which indicated Mazzei's victory margin was only 0.6 percentage points. **Key Market Signals** - **Widespread Repricing:** The implied probability for all five listed outcomes where Mike Mazzei secures a victory margin of 3% or more uniformly declined to 1%, indicating a market consensus that his actual margin was well below this range. - **Largest Repricing:** The implied probability of Mike Mazzei achieving a victory margin of 6% or more saw the sharpest decline, falling by 67 pp from 68% to a current 1% probability. - **Catalyst Identified:** The primary driver for the market shift was the official certification of Mike Mazzei's 0.6 pp victory margin, which invalidated all pre-election implied probabilities for margins of 3% or greater. --- The results of Oklahoma's Republican gubernatorial runoff on Tuesday, August 25, 2026, sent a decisive shock through prediction markets, as Mike Mazzei's razor-thin victory margin fell far short of traders' expectations. Contracts on the Kalshi exchange pricing a comfortable Mazzei win of 6% or more plunged from 68 cents to 1 cent in the session ending August 26, a 67-percentage-point drop. The sharp repricing occurred after news outlets reported Mazzei defeated Attorney General Gentner Drummond by just 2,047 votes, a margin of approximately 0.6 percentage points, an outcome that ensures contracts for larger victory margins will resolve to "No." The market move reflects a widespread collapse in expectations for a decisive Mazzei victory, which had been priced as the most likely scenario before polls closed. Every contract tracking a significant margin of victory for Mazzei saw its value plummet to the market floor of 1%, indicating traders now see virtually no chance of those outcomes having occurred. The shift aligns the market with the reality of a hard-fought contest that was ultimately decided by one of the narrowest margins in a recent statewide Oklahoma runoff. ## Distribution Analysis | Outcome | Current Prob | Change | Volume | | :--- | :--- | :--- | :--- | | Mike Mazzei, ≥3% | 1% | **-62.0pp** | 4,830 | | Mike Mazzei, ≥6% | 1% | **-67.0pp** | 3,059 | | Mike Mazzei, ≥9% | 1% | -25.0pp | 2,379 | | Mike Mazzei, ≥12% | 1% | -13.0pp | 844 | | Mike Mazzei, ≥15% | 1% | -1.0pp | 1,413 | **Net: 5 of 5 listed contracts declined on over 12,500 in total volume, as the market priced in a victory margin well below the 3% minimum threshold available for trading.** ## What's Driving the Shift The repricing was a direct and immediate reaction to the certified election results. - **Razor-Thin Victory Margin:** The primary driver was the official vote tally. Mike Mazzei secured the nomination with [186,678 votes (50.3%) to Gentner Drummond's 184,631 (49.7%)](https://nondoc.com/2026/08/25/edge-of-your-seats-trump-support-propels-mike-mazzei-past-gentner-drummond/). This corresponds to a victory margin of approximately 0.6 percentage points. As this result is well below the lowest available contract threshold of "≥3%", all listed contracts are on track to resolve to "No," justifying the price collapse to near zero. - **Pre-Election Polling and Endorsements:** The high pre-election odds for a large Mazzei victory were likely influenced by several factors, including a [key endorsement from President Donald Trump](https://www.nbcnews.com/politics/2026-election/mike-mazzei-winner-oklahoma-republican-governor-primary-trump-rcna593583). Historically, Trump-backed candidates have performed strongly in Republican primaries, which may have led traders to anticipate a more comfortable win than what materialized. The stark contrast between these expectations and the final narrow result created the conditions for the dramatic market correction. - **High Runoff Turnout:** The 2026 runoff saw robust participation, with 371,309 Republicans casting ballots. This marked only an 8% decrease from the June primary, a significantly smaller drop-off than the 33% decline seen in the [2018 Republican gubernatorial runoff](https://nondoc.com/2026/08/25/edge-of-your-seats-trump-support-propels-mike-mazzei-past-gentner-drummond/). While turnout was high, the electorate was almost evenly split, preventing the blowout victory some traders had priced in. ## Market Context The pre-election pricing, with the "≥6%" contract at 68%, suggests traders may have been anchored to historical precedents. For example, the 2018 GOP gubernatorial runoff saw Kevin Stitt defeat Mick Cornett by a commanding [margin of 9.2 percentage points (54.6% to 45.4%)](https://ballotpedia.org/Oklahoma_gubernatorial_election,_2018_(August_28_Republican_primary_runoff)). The combination of that recent history and the weight of the Trump endorsement likely led to an overestimation of Mazzei's potential margin. The post-election price action is typical for binary political markets where results are definitive. Once the vote count became clear, uncertainty was eliminated, and prices rapidly converged to either 100% or 0% probability. In this case, the entire slate of high-margin outcomes was invalidated simultaneously, resulting in a coordinated sell-off across multiple contracts. ## What to Watch With the runoff decided, Mike Mazzei will now face Democratic nominee Cyndi Munson in the November general election. The market contracts will officially settle based on the final, certified results from the Oklahoma State Election Board. Although the outcome is now known, the contracts will remain open for trading until the market's close date in 2027, but are expected to remain at their current levels. ## Related Analysis - [Read the complete market report for Oklahoma Republican Governor runoff margin of victory? (Mike Mazzei)](/markets/elections/primaries/oklahoma-republican-governor-runoff-margin-of-victory-mike-mazzei/) ### Relevant Answer Library - [What does market manipulation look like in prediction markets, and how can I spot it?](/answers/what-does-market-manipulation-look-like-in-prediction-markets-and-how-can-i-spot-it) - [Best prediction market platforms for investors in 2026](/answers/best-prediction-market-platforms-for-investors) - [How do you monitor prediction market moves automatically?](/answers/how-do-you-monitor-prediction-market-moves-automatically) - [Browse all Answer Library topics](/answers/)