Polymarket Top Prediction Events: What Are the Funds Betting On?

Forecast markets experienced explosive growth in 2026. In the first quarter of 2026, on-chain prediction market trading volume reached $36 billion, surpassing traditional on-chain casino gambling for the first time. In April, Polymarket and Kalshi's combined monthly trading volume exceeded $25 billion. In June, data disclosed by a16z crypto showed that weekly trading volume in prediction markets hit an all-time high of $10.8 billion.

During this growth cycle, Polymarket, as the world's largest prediction market platform, has seen its event contract trading data become an important window into market sentiment and capital flows. From sports events to geopolitics, macroeconomics to technological competition, funds are pricing key future events with real money.

2026 World Cup Champion – Sports Bets in the $3 Billion Range

The 2026 US-Canada-Mexico World Cup is currently the largest single event contract on Polymarket. As of June, the trading volume of World Cup champion contracts on Polymarket has surpassed $3 billion. This figure is close to Polymarket’s largest historical event contract—the $3.69 billion in transactions for the 2024 US presidential election.

The tournament has expanded from 32 to 48 teams, with 40 more matches, which industry executives call an “unprecedented betting opportunity.” According to Macquarie, total bets related to the World Cup across major betting channels could exceed $50 billion this year. Bernstein reports that the World Cup could generate up to $10 billion in consumer trading volume in sports betting and prediction markets.

Regarding specific odds for the champion, Polymarket shows France’s winning probability at about 18%, Spain at about 13%, Argentina at about 13%, and England at about 10%. Notably, in terms of trading volume, Uzbekistan unexpectedly attracted over $59 million in trades—despite its championship probability being only about 0.01%. This mainly results from Polymarket’s liquidity incentives, where traders repeatedly buy and sell low-probability contracts to earn platform rewards rather than genuinely believing in the team’s chances.

Single matches during the World Cup also attracted huge sums. On June 16, a user bet $400k on Polymarket that Spain would not beat Cape Verde, ultimately earning $4.7 million in profit; another user bet over $1 million on Spain to win, but lost everything. Another user wagered $8.6 million on Belgium beating Egypt, which ended in a 1-1 draw, resulting in total loss. These cases reveal the high volatility of prediction markets—discrepancies between probability pricing and actual outcomes are the source of traders’ profits or losses.

Normalization of the Strait of Hormuz Shipping – Real-Time Pricing of Geopolitical Risks

The Strait of Hormuz is one of the world’s most critical oil transit routes, with its navigability directly linked to energy prices and global supply chains. A series of event contracts on Polymarket related to the Strait of Hormuz has become a core reference for geopolitical risk pricing.

As of June 24, 2026, the contract on Polymarket asking “Will the Strait of Hormuz traffic return to normal before July 15?” shows a 75.5% probability of “No” and 24.5% for “Yes,” with about $2.59 million in trading volume. Shorter-term contracts—such as “Will the Strait of Hormuz return to normal before June 30?”—show a “No” probability as high as 97.5%, with a trading volume of $33.06 million.

Multiple expiry date contracts have amassed significant trading volumes. The “Return to normal before June 30” contract has over $28 million in trades; the “Return to normal before July 31” contract has about $8.2 million. Bloomberg analysis indicates that the scale of abnormal trades in Iran-related bets on Polymarket has reached a total of $45 million.

These probability shifts reflect the market’s real assessment of Middle East developments. Iran has stated that the Strait of Hormuz “will never return to pre-war conditions,” and re-closed the strait last week. Meanwhile, the market is also pricing broader political tail risks—such as the “Iran regime collapse before June 30”—with the “No” probability reaching 99.75%, and about $63.71 million in trading volume.

2026 US Midterm Elections – The Traditional Arena for Political Forecasts

Political prediction markets continue to contribute increasingly to platform trading volume, even surpassing the traditional dominance of sports predictions. The 2026 US midterm elections are a core focus on Polymarket’s political category.

In the contract “Will the Democrats control the House after the 2026 midterms?”, a “smart money” trader invested $10.2k betting “Yes,” with an average buy-in probability of 79% and a current probability of 80.5%. This trader’s 25 settled trades in the political category have a win rate of 64%.

At the Senate level, four accounts combined invested $32.4k, betting on “Democratic control of both Senate and House.” Four active contracts related to Trump and Musk splits have a total of $1.87 million in bets. Among these, the Senate flip contract has over $1 million in trading volume, with a “Yes” probability of 55.5%.

Recent polls show Trump’s approval rating has fallen to 37%, with Democrats leading Republicans 50% to 39% in congressional races. Silver Bulletin describes this as “the bluest election cycle.” These fundamental data points align with Polymarket’s probability pricing, forming the basis of market consensus.

AI Model Race and Tech Giants’ Market Capitalization – Emerging Categories on the Rise

Beyond sports and geopolitics, tech prediction markets are among the fastest-growing categories on Polymarket.

“Which company will have the strongest AI model by the end of June?” is one of the most actively traded tech prediction markets, with nearly $10 million in volume. The market currently favors Anthropic, and any major model release could trigger significant price swings.

In terms of listed company market cap rankings, the contract “Will Apple become the second-largest publicly traded company by June 30?” attracted three “smart money” accounts investing $7,500. The “Third-largest company” contract has over $10 million in trading volume, with current prices strongly favoring Apple maintaining its third-place position.

While these tech contracts’ trading volumes are still below those of World Cup or geopolitical events, their rapid growth and attention reflect a trend of prediction markets expanding from traditional sports and politics into broader fields.

Summary

Based on Polymarket’s contract trading data, current capital flows exhibit the following features:

First, sports events are the largest single pool of funds. The World Cup champion contract surpassing $3 billion in volume suggests it may overtake the 2024 US election (with $400k) as Polymarket’s largest event contract. Frequent million-dollar bets in individual matches reflect high liquidity and participation in sports prediction markets.

Second, geopolitical risks are the most capital-dense area. The cumulative trading volume of Strait of Hormuz-related contracts exceeds $45 million, and the probability of normalization dropping from over 75% in late May to about 27% in early June illustrates active pricing of Middle East uncertainties.

Third, political elections remain the core. Multiple contracts related to the US midterms attract from thousands to millions of dollars, with political prediction markets contributing more to platform volume than sports.

Fourth, tech contracts are rising. AI model competitions and tech giant market cap rankings, though still smaller than traditional categories, are growing rapidly, indicating future expansion directions for prediction markets.

The essence of prediction markets is “voting with money”—each transaction aggregates dispersed information into a quantifiable probability. When $3 billion flows into World Cup contracts, or when the probability of normalization for the Strait of Hormuz drops 9 percentage points within 24 hours, behind these numbers are the collective judgments of thousands of market participants about the future. For observers, understanding these capital flows is understanding how markets are pricing the future.

FAQ

Q1: What is the current event with the largest trading volume on Polymarket?

The 2026 FIFA World Cup champion contract is currently the largest single event on Polymarket, with trading volume surpassing $3 billion as of June. It is expected to surpass the 2024 US election (with $3.69 billion) to become the platform’s largest event contract.

Q2: How large is the trading volume related to the Strait of Hormuz prediction market?

Multiple expiry contracts related to the Strait of Hormuz have amassed significant volume. The “Return to normal before June 30” contract exceeds $28 million, and the “Return to normal before July 31” contract is about $8.2 million. Bloomberg analysis indicates abnormal trades related to Iran have totaled $45 million.

Q3: How has the probability of the US-Iran peace agreement changed on Polymarket?

The probability of “The US and Iran reaching a permanent peace agreement before June 30” plummeted from over 75% in late May to about 27% in early June. As of mid-June, two “smart money” traders invested a total of $133.4k betting on the agreement’s success.

Q4: How is the US midterm election participation on Polymarket?

The “Control of the House” contract attracted “smart money” of $10.2k; four accounts in the Senate-related contracts invested a total of $32.4k; and four contracts related to Trump and Musk splits have a combined bet of $1.87 million.

Q5: How are tech prediction markets performing on Polymarket?

“Which company will have the strongest AI model by the end of June?” has nearly $10 million in trading volume. The “Third-largest listed company” contract has over $10 million in volume. Tech prediction markets are among the fastest-growing categories on Polymarket.

Q6: How large is the overall prediction market?

In Q1 2026, on-chain prediction market trading volume reached $36 billion. In April, Polymarket and Kalshi’s combined monthly volume exceeded $25 billion. In June, weekly trading volume hit $10.8 billion for the first time. Bernstein forecasts the market will reach approximately $1 trillion by 2030.