Hedge funds have more than tripled in size over the past decade and now occupy a significantly larger role in global financial markets, according to the International Monetary Fund. The expansion is strengthening their influence over trading, liquidity and risk transfers, while also raising concerns that leverage and limited transparency could amplify instability during periods of market stress.

Hedge Funds Have Become a Larger Market Force

Hedge fund assets reached approximately $13 trillion in early 2026, compared with around $4 trillion in 2013, according to findings released by the IMF ahead of its full Global Financial Stability Report. The increase reflects a substantial expansion in the sector and a growing role in financial markets.

The IMF said hedge funds are increasingly important participants in trading, liquidity provision and risk transfers. Their greater presence can improve market efficiency by adding liquidity and helping distribute risk among investors. However, the same scale can become a source of vulnerability when market conditions deteriorate, particularly if multiple funds respond to losses or funding pressures at the same time.

Leverage Is Driving Much of the Expansion

The IMF found that hedge fund growth has been driven primarily by leverage, including synthetic leverage created through derivatives. This allows funds to build market exposures that can be substantially larger than the capital they directly deploy, increasing both potential returns and the speed at which losses can accumulate.

Leverage becomes particularly important during periods of market volatility. Falling asset prices can trigger margin requirements, portfolio adjustments or forced deleveraging, potentially increasing selling pressure across markets. The IMF therefore views the sector’s expanding use of leverage as an important consideration for financial stability, even where individual funds may appear capable of managing their own risks.

Hedge Funds Expand Their Role in Treasury Markets

The sector’s growing influence is especially visible in sovereign debt markets. Hedge funds now account for approximately 9% of the U.S. Treasury market, compared with 4% in 2022, demonstrating how quickly their footprint has expanded in one of the world’s most important financial markets.

A larger hedge fund presence can contribute to liquidity and more efficient pricing of government securities. At the same time, concentrated activity by leveraged investors can potentially increase market sensitivity during periods of stress. Developments in Treasury markets therefore have implications beyond individual funds because changes in liquidity and pricing can affect borrowing costs and financial conditions more broadly.

IMF Calls for Better Visibility Into Risks

The IMF warned that hedge funds remain inherently opaque, making it difficult for policymakers and other market participants to assess their full exposures and interconnected risks. The combination of limited transparency, leverage and a growing market footprint creates challenges for authorities seeking to identify vulnerabilities before they become systemic.

The IMF is calling for policymakers to close data gaps and strengthen monitoring of the sector. For global investors, the key issue will be whether regulatory and reporting frameworks can keep pace with the rapid expansion of hedge fund activity. As the funds become more deeply embedded in Treasury and other major markets, their behavior during periods of volatility will remain an important indicator of broader financial-system resilience.