Prediction market trading volume hit $5 billion in the final week of 2025 and again in the first week of 2026. Kalshi led with 38.2%, followed by Opinion (30.3%) and Polymarket (28.6%). Kalshi signed deals with top media firms, while Polymarket secured a $2 billion investment from ICE. Transaction volume and platform activity continue to rise as competition intensifies.

In the final week of 2025, weekly prediction market notional volume cleared $5.3 billion, and the opening week of 2