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Prediction Market Sector Approaches $20 Billion Volume, With Polymarket US Increasing Market Share

The prediction market industry is reportedly nearing an overall trading volume of $20 billion, with Polymarket's US-focused platform demonstrating notable growth in its portion of this activity.

PredictionSites Newsroom · 29 September 2026

Reports indicate that the cumulative trading volume across the prediction market sector is approaching a significant milestone of $20 billion. This figure encompasses activity across various platforms where users can bet on the outcomes of future events, ranging from political elections to technological advancements and economic indicators. Such markets allow participants to express their views on potential future events by buying and selling shares that pay out based on accuracy.

Within this expanding landscape, Polymarket US is noted to be capturing a larger share of the overall market activity. Prediction markets, by their nature, allow for the aggregation of collective wisdom, with the price of an event's 'shares' often reflecting the market's perceived probability of that event occurring. For example, if shares predicting a 'yes' outcome trade at 70p, the market collectively assigns a 70% chance to that outcome.

Polymarket, like other platforms in the sector, offers markets on a diverse range of topics, enabling participants to speculate on real-world events. The increase in its market share suggests a growing user base and heightened engagement with its offerings, particularly within the US.

This trend of increasing volume and market specialisation highlights the ongoing development of the prediction market industry. As these platforms continue to mature, they attract more participants, potentially enhancing the efficiency and accuracy of the collective forecasts they generate.

Reported first by DeFi Rate — read the original report. This article was written by the PredictionSites newsroom from that report.