Europe's financial regulator has declared that two of the world's largest prediction market platforms, Polymarket and Kalshi, do not hold the required authorization to operate within the European Union. In a risk report published on September 10, 2026, the European Securities and Markets Authority (ESMA) classified event contracts offered by these platforms as financial derivative products, subjecting them to mandatory authorization that neither currently possesses.

Why Is Europe Targeting These Prediction Market Giants?

ESMA's action comes as prediction markets have experienced explosive growth since the 2024 U.S. presidential election. The two platforms combined generated $20.8 billion in trading volume over the fourth quarter of 2025 alone, with Polymarket recording $12 billion and Kalshi $8.8 billion. This acceleration has caught the attention of European regulators concerned about both consumer protection and systemic financial risk.

The regulatory challenge stems from a fundamental structural difference between the two platforms. Kalshi operates as a centralized platform regulated in the United States by the Commodity Futures Trading Commission (CFTC), while Polymarket combines blockchain-based trading and settlement with centralized governance, directly linking prediction markets to cryptocurrency, decentralized finance (DeFi), and smart contracts. This architectural distinction means they face different regulatory pathways in Europe.

What Are the Three Possible Legal Regimes for Prediction Markets in Europe?

ESMA has identified three distinct regulatory scenarios that could apply to prediction market contracts, depending on their underlying assets, technology, and the user's country of residence:

• Binary Options Classification: When a contract is based on a financial variable, it may be classified as a binary option, a product that has been prohibited from sale to retail investors in the EU for several years due to massive consumer losses.
• MiCA Regulation: When a contract relies on blockchain technology without constituting a financial instrument, it may fall under the Markets in Crypto-Assets (MiCA) regulation, which governs crypto-assets within the European Union.
• National Gambling Laws: In all other cases, national legislation on gambling applies, meaning rules vary significantly from country to country across Europe.

This fragmented approach creates a critical problem: the same prediction market contract can change legal status based on its underlying asset, its technology infrastructure, and which European country a user resides in. There is currently no single regulatory passport that automatically covers political, sports, economic, and crypto betting across the EU.

The regulatory tightening is not new to these platforms. Eight European countries already block Polymarket and Kalshi, including France, which ordered internet providers to block Polymarket in July 2026. Spain temporarily targeted both platforms starting in May for lacking gambling licenses, while Switzerland, Poland, Belgium, and Portugal have also implemented restrictions.

How Do Polymarket and Kalshi Differ in Their User Base and Risk Profile?

The composition of trading volumes on each platform reveals distinct clienteles and regulatory risks. On Kalshi, sports betting accounts for 73 percent of identified activity, while on Polymarket, political contracts represent 29 percent of volume, followed by sports at 19 percent and crypto-asset-linked contracts at 15 percent. This difference matters because each category carries different regulatory implications and consumer protection concerns.

ESMA's concern extends beyond prediction markets themselves. The regulator has linked the growth of prediction markets to a broader vulnerability in global financial markets. ESMA warns that massive spending by technology giants in artificial intelligence, funded on credit, is inflating stock market valuations and raising the risk of a significant bubble. A correction in equity markets could push large investors to sell their most liquid assets, including cryptocurrencies, to raise cash.

The numbers already illustrate this vulnerability. Bitcoin's price dropped 35 percent in the first half of 2026, while some smaller tokens lost up to 61 percent of their value. U.S. Bitcoin exchange-traded funds (ETFs) recorded over $5.5 billion in outflows, compared to nearly $2 billion in losses for Ethereum ETFs.

Can Europe's Fragmented Approach Actually Slow an Institutionalizing Sector?

European regulatory tightening arrives precisely as prediction markets are entering traditional finance. Intercontinental Exchange (ICE) has committed to investing up to $2 billion in Polymarket and distributing its event data. In June 2026, Cboe launched products linked to the closing level of the S&P 500, while Nasdaq received approval from the Securities and Exchange Commission (SEC) for predictive options on the Nasdaq-100. Galaxy Digital has also offered over-the-counter transactions for institutions on contracts referenced to Polymarket and Kalshi since June.

Despite these institutional developments, ESMA has requested that each event contract be qualified before marketing, rather than treating the entire prediction market as a homogeneous category. The challenge for Polymarket and Kalshi now extends beyond a few national blockages. They will need to demonstrate that their licenses, identity verification procedures, operation monitoring, and geographic restrictions genuinely correspond to each country they serve.

Meanwhile, Polymarket itself is making strategic moves to strengthen its position. The platform appointed its first Chief Financial Officer, Warren Jenson, who previously held senior financial positions at media research company Nielsen and marketing firm LiveRamp. Jenson officially joined Polymarket this week as the company seeks a new round of investment to regain growth momentum in competition with Kalshi.

The prediction market sector is projected to be worth $1 trillion by 2030, according to industry estimates cited in ESMA's report. However, the path to that valuation now runs through a complex patchwork of European national regulations, U.S. federal oversight, and institutional adoption. For Polymarket and Kalshi, the stakes are clear: either they adapt to Europe's fragmented regulatory framework, or the growth of prediction markets may continue outside the continent entirely.