The world’s safest asset is increasingly supported by one of finance’s most leveraged trades. Washington is running deficits near $2 trillion, Treasury auctions need new capital, and hedge funds are becoming a bigger part of the system keeping government debt moving. The Treasury market is not about to break, but its stability increasingly depends on investors who can retreat quickly when financing costs rise.
A Flood of Debt Needs New Buyers
The Congressional Budget Office’s February 2026 outlook projects a $1.9 trillion federal deficit for fiscal year 2026 and expects debt held by the public to reach 101 percent of gross domestic product. The Treasury Department’s latest published financing estimate calls for $671 billion of privately held net marketable borrowing during the July through September quarter. The CBO projects another $26 trillion of public borrowing between the end of 2025 and 2036.
The buyer base has changed. CBO estimates that domestic entities held roughly 70 percent of publicly held federal debt in September 2025, while foreign investors held about 30 percent. The Federal Reserve and mutual funds were the largest domestic holders. Foreign governments and central banks remain important, but the United States cannot assume official buyers will absorb every additional auction without demanding higher yields.
Hedge Funds Fill the Gap
A Federal Reserve analysis published in June found that large hedge funds’ gross Treasury exposure doubled between 2023 and September 2025, reaching $4 trillion. Their Treasury holdings increased from about 4.5 percent to 8.5 percent of outstanding securities. Repo borrowing climbed to $3 trillion, while the 50 largest funds controlled approximately 90 percent of hedge-fund Treasury exposure. The Fed’s assessment was blunt: “The scale of this expansion is striking.”
Much of that growth comes from the cash-futures basis trade. A fund buys a Treasury security, finances it in the repo market, and sells a related futures contract. The profit comes from a small pricing difference that should converge. Because the spread is tiny, funds use huge leverage. The Fed estimates that the trade reached approximately $830 billion by September 2025, nearly twice its early-2020 peak.
This arrangement benefits Washington. Hedge funds create demand, connect prices between cash and futures markets, and help dealers distribute the growing government debt. Earlier Federal Reserve research estimated that hedge funds purchased $428 billion of Treasuries during the 2017 to 2019 period of quantitative tightening, with likely basis traders accounting for 91 percent.
Liquidity Can Vanish Under Pressure
Leveraged liquidity is conditional. Hedge funds maintain positions only while financing remains available and the trade is profitable. A jump in repo rates, higher futures margins, or sudden volatility can force funds to sell Treasuries at the worst moment.
That happened in March 2020. Federal Reserve researchers estimate that hedge funds sold a net $173 billion of Treasury securities during the turmoil, with basis traders responsible for most of it. The unwind intensified pressure on dealers and contributed to dysfunction in the foundation of global finance. The Fed eventually pledged to purchase securities in the “amounts needed to support smooth market functioning.”
Hedge funds did not cause the entire crisis. Foreign investors, mutual funds, and other institutions were also selling. The warning is that a buyer providing liquidity during normal times can turn into an aggressive seller during stress. As hedge-fund participation grows, that reversal becomes more dangerous.
Reform Helps, but the Backstop Question Remains
Regulators are pushing more Treasury transactions into central clearing. The Securities and Exchange Commission set deadlines of December 31, 2026, for eligible cash trades and June 30, 2027, for eligible repo transactions. Clearing should improve transparency and reduce some counterparty risk. It will not eliminate leverage or guarantee that funds stay invested during a shock.
The Office of Financial Research estimates that about 75 percent of hedge funds’ Treasury repo activity is still not centrally cleared. Stronger infrastructure helps, but it does not change the situation: hedge funds provide balance-sheet capacity because the trade is profitable, not because they have a public obligation to finance the United States.
America’s borrowing needs are colliding with a Treasury market whose marginal buyers are increasingly leveraged and sensitive to funding costs. This can work well for years. Then one volatile week can reveal the weakness.
That dependence deserves more attention than any single auction’s headline demand statistics.
Washington is not just issuing more debt. It is quietly increasing the odds that the Federal Reserve will again be asked to protect the market when private arbitrage stops carrying the load.
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