Complete Prediction Markets & Event Contract Trading Guide for May 2026

Market Share of Kalshi

89%

Kalshi holds approximately 89% of the U.S. market share for prediction markets.

Polymarket Trade Volume

$3.7 billion

Polymarket processed over $3.7 billion in trades during the 2024 presidential election.

Legal Status of Prediction Markets

50 states

Prediction markets are now considered legal across all 50 U.S. states under CFTC oversight.

§ 01 Executive Snapshot

What: The rise and regulation of prediction markets as a mainstream financial product.
Who: Key platforms include Kalshi, Polymarket, Robinhood Predictions, and others.
Why it matters: This evolution reflects a significant shift in how individuals engage with financial forecasting, offering a new avenue for speculation and investment.

Prediction markets are now considered legal across all 50 U.S. states under CFTC oversight, although several states are challenging this in court.
Kalshi holds approximately 89% of the U.S. market share for prediction markets, while Polymarket dominates on a global scale.
Polymarket processed over $3.7 billion in trades during the 2024 presidential election, marking a pivotal moment for the industry.

The modern prediction market concept dates back to the University of Iowa's Electronic Markets in 1988, evolving from niche betting to a regulated industry.
The 2024 presidential election served as a crucial inflection point, transitioning prediction markets into a recognized financial product with significant trading volumes.

The immediate consequence is the increased competition among platforms, pushing for better liquidity and user experience.
Long-term, the regulatory landscape will shape how these markets evolve, impacting user trust and market participation.

Legal challenges in various states pose significant risks, potentially affecting the operations of prediction market platforms.
Competition from traditional betting and emerging platforms could dilute market share and trading volumes for established players.

Upcoming legal rulings in states challenging the legality of prediction markets will be critical in determining future operational capabilities.
Monitoring the rollout and performance of new prediction market products from major players like FanDuel and DraftKings will indicate market trends and user adoption.