Hedge funds now command a record 7% of the $30 trillion U.S. Treasury market, holding $2 trillion in debt by end-2025—a threefold increase in five years. While this influx provides vital liquidity, regulators and experts warn that hedge funds’ aggressive leverage and popular basis trades could amplify market turmoil and create systemic financial instability, especially during periods of stress. The rising interest comes as traditional long-term investors like pension funds shift away, raising questions about the stability of the world’s largest bond market.
Hedge funds are rapidly transforming into a dominant force within the colossal $30 trillion U.S. Treasury market. Their surge comes at a pivotal moment, as some traditional long-term investors seek alternative avenues, making hedge funds crucial buyers for the government's ever-expanding debt.
However, this shift, while aiding government financing, is simultaneously raising alarms among experts who warn it could render the world's largest bond market significantly more vulnerable.
By the end of 2025, hedge funds' cash Treasury holdings soared to an unprecedented $2 trillion, a near threefold increase over just five years, as reported by the U.S. Treasury's Office of Financial Research. This constitutes a record 7% share of the $28.9 trillion marketable Treasury debt. Federal Reserve data further indicates sustained buying, with domestic hedge funds accumulating a net $87 billion in Treasurys during the first half of 2026.
This heightened involvement coincides with a period of intense volatility for the Treasury market, with the 10-year yield recently hitting its highest since 2007 and the 30-year yield surging to levels not seen since 2002.
Ricky Siao, a hedge fund specialist at Union Bancaire Privée, articulated the core concern: "Hedge funds apply relatively aggressive leverages as compared to other types of investors and therefore may magnify systematic risk. When forced deleveraging happens due to extreme situations or crisis scenarios, it may result in broader liquidity and financial stability event."
The Evolving Landscape of Treasury Buyers
Historically, pension funds were the bedrock of demand for long-dated government bonds, aligning their extensive investment horizons with long-term liabilities. However, structural changes, including the migration from defined-benefit to defined-contribution plans, are diminishing pension funds' appetite for such bonds, as noted by the OECD. Many are now redirecting capital towards higher-yielding, less-liquid assets like private credit, with institutional investors pouring close to $300 billion into private credit vehicles in 2025.
Regulators have been quick to highlight the associated risks. The Federal Reserve's May financial stability report underscored that hedge-fund leverage remains near record highs, concentrated among large funds employing leveraged strategies in Treasurys. The Fed warned, "High leverage can lead to spillovers if the fund suddenly loses access to funding." The Bank for International Settlements (BIS) echoed these concerns, stating that hedge funds' rise as core intermediaries in government bond markets has created "new financial stability vulnerabilities" due to their reliance on leverage and short-term repo financing.
Noah Hamman, founder of AdvisorShares, emphasizes the distinct motivations: "They are very different, most pension and insurers have very long term time horizons and focus on liability matching. Hedge funds are about performance, typically shorter term focused on high watermarks and benchmark-beating returns."
Stress Test for Basis Trades
A significant portion of hedge fund activity revolves around relative-value strategies, particularly the Treasury cash-futures basis trade. This involves buying cash Treasurys and simultaneously selling corresponding futures, aiming to profit from minute price differentials. Given these tiny margins, funds employ substantial leverage, often 20 times or higher, facilitated by repo financing against Treasury collateral.
However, cracks are appearing. Leveraged Treasury basis-trade positions have reportedly declined by approximately 20% this year to $1.2 trillion, according to Morgan Stanley estimates. While this doesn't signify a wholesale dumping of Treasurys, it underscores the fragility of leveraged positions in shifting market conditions.
Don Steinbrugge, founder and CEO of Agecroft Partners, elaborated on the inherent dangers: "The biggest risk is the basis trade, where a hedge fund simultaneously buys Treasury notes and sells the futures contract that the notes are eligible to settle against... As we saw in March 2020, when Treasury market liquidity deteriorated sharply, leveraged funds can be forced to unwind positions quickly. This can create a vicious cycle of margin calls, forced selling, and further market volatility." A spike in market volatility can trigger margin calls, forcing funds to sell, which in turn drives prices down, exacerbates losses, and compels other funds to exit.
Despite these critical warnings, experts also acknowledge the beneficial role hedge funds play. Ken Heinz, president of Hedge Fund Research, argues that hedge funds' active trading provides crucial two-sided liquidity, both during market rallies and sell-offs. This liquidity can ultimately stabilize interest rate movements and reduce overall volatility.
The central dilemma for regulators, therefore, is balancing these opposing forces. Steinbrugge concluded, "Regulators should be concerned about the potential for a disorderly unwind while weighing the benefits of market liquidity that hedge funds provide when making policy decisions. Hedge funds' growing role in the Treasury market is both necessary for liquidity and a potential source of systemic risk."
