Wintermute, the London-based algorithmic trading firm and OTC desk, officially confirmed on May 29, 2026, that it has begun providing two-sided liquidity across leading prediction market venues. The institutional move coincides with a massive surge in the sector, where event-contract trading volume has already surpassed $60 billion during 2026. By quoting continuous bid and offer prices, Wintermute aims to reduce spreads and support larger trade sizes on platforms like Polymarket and Kalshi.
The firm, which maintains an annual trading volume of over $3.5 trillion, is extending its institutional-grade infrastructure into the space to improve the reliability of market-implied probabilities. Jake Ostrovskis, Head of OTC Trading at Wintermute, noted that these markets currently possess the demand profile of a major asset class but the liquidity profile of an early-stage one. Providing sustained liquidity is intended to improve the “signal” embedded in market prices by allowing the sector to price real-world uncertainty directly.
Wintermute’s entry follows similar moves by Jump Trading and Galaxy Digital, signaling that professional market makers now view event contracts as a serious derivatives frontier. The firm brings significant technical expertise to the table, having already processed a cumulative trading volume exceeding $5 trillion across more than 50 venues in the digital asset space. This transition reflects a broader trend where shifting investor sentiment is driving capital toward sophisticated alternative trading venues.
Rapid growth in event contract trading volume
The scale of prediction markets has expanded rapidly over the last several months, fueled by high-profile global events. According to a Pew Research Center analysis, combined monthly global trading volume on Kalshi and Polymarket rose from less than $5 billion in September 2025 to about $24 billion in April 2026. As of April 2026, the combined cumulative historical trading volume for these two platforms stood at over $150 billion.
Specialization has emerged between the two market leaders. Sports events have driven 80% of volume on Kalshi since July 2024, while Polymarket’s volume mix is more balanced, with 32% attributed to politics and 20% to crypto. These figures suggest that users are increasingly comfortable using these platforms to hedge against specific outcomes, much like they might manage risk when crypto liquidations rise in volatile periods.
The influx of participants is equally sharp. Monthly unique wallets nearly tripled in the six months leading up to February 2026, reaching 840,000. Institutional interest was further evidenced by a record-breaking Super Bowl, which saw more than $6 billion in total prediction market volume. Kalshi reported its Super Bowl LX volume exceeded $1 billion, representing a 2,700% increase from the prior year’s championship game.
Regulatory shifts and institutional integration
As trading volumes soar, the industry is facing intensified global scrutiny. Spain ordered ISP-level blocks on both Polymarket and Kalshi on May 26, 2026, citing unlicensed-gambling concerns. This follows similar actions taken in 2026 by Brazil, Indonesia, India, and Portugal. Such localized crackdowns continue despite the sector’s efforts to align with financial standards, such as when legislative progress in other digital asset sectors provides a roadmap for compliance.
In the United States, the Commodity Futures Trading Commission (CFTC) cleared Kalshi to offer Bitcoin perpetual futures, a move that pushes the platform into traditional derivatives territory. However, a New York Times investigation reported that certain CFTC officials who raised internal concerns about prediction markets were suspended and removed from the agency. This internal friction highlights the ongoing debate over the regulatory classification of event contracts.
Partnerships are also expanding the types of events being traded. Polymarket recently established a partnership with Nasdaq Private Market to open contracts on private-company valuations. For market makers like Wintermute, the math remains compelling as long as volumes continue to compound. By operating across more than 70 exchanges, the firm aims to leverage its execution and risk control expertise to stabilize these evolving forecasting engines.