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Kalshi and Polymarket capture nearly all tracked event contract volume

VIP-Grinders' October 2026 prediction markets report, built on Artemis data across 11 platforms, says Kalshi and Polymarket together now account for 97.7 percent of event contract volume, up from 63.0 percent in December. The same report put October volume at a record 121.28 billion dollars, with Kalshi and Polymarket the only platforms tracked in its category and fee analysis because of that combined share.

Kalshi and Polymarket’s combined share of event contract volume reached 97.7 percent in October 2026, compared with 63.0 percent in December, according to VIP-Grinders’ October 2026 prediction markets report.

The report draws on Artemis data covering 11 platforms. Its findings show activity becoming more concentrated in the two leading venues as total volume reached a new high.

Record volume, narrower analytical coverage

October volume totaled a record 121.28 billion dollars, according to VIP-Grinders. That figure accompanies a substantial shift in the distribution of trading across the platforms covered by the report.

VIP-Grinders limited its category and fee analysis to Kalshi and Polymarket because of their combined 97.7 percent share. That narrower analytical scope is distinct from the 11-platform dataset underpinning the report.

What it means for prediction markets

  • Concentration is the central development: Kalshi and Polymarket’s combined share rose from 63.0 percent in December to 97.7 percent in October 2026.
  • Record activity does not imply broad participation across venues: October’s 121.28 billion dollars in volume coincided with nearly all tracked activity being concentrated on two platforms.
  • Scope matters when interpreting the findings: The report’s category and fee analysis covers only Kalshi and Polymarket, rather than all 11 platforms in the Artemis dataset.
KalshiPolymarketInfiniti MarketsInfiniti Signals

Sources & attribution

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    VIP-Grinders
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  2. Source 2
    Artemis data via VIP-Grinders
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