Treasury market fragility flagged

The market for United States government debt is absorbing more borrowing, with officials and outside analysts warning that its plumbing could seize up in a fast selloff. (imf.org) (brookings.edu) United States Treasuries are the bonds and bills Washington sells to fund deficits, and they set borrowing costs across mortgages, corporate debt and global finance. Brookings said in February 2026 that debt held by the public was near 100 percent of gross domestic product, while the Congressional Budget Office projects 120 percent by 2036. (brookings.edu) (cbo.gov) The International Monetary Fund said in its April 2025 Global Financial Stability Report that highly leveraged nonbank firms can amplify losses and impair market functioning. The report was discussed by the International Monetary Fund board on April 11, 2025 and published on April 22, 2025. (imf.org 1) (imf.org 2) One pressure point is the cash-futures basis trade, a spread trade in which hedge funds buy Treasury securities, short Treasury futures and finance the position in the repurchase agreement market. Federal Reserve researchers estimated in March 2024 that hedge funds had built at least $317 billion of Treasury holdings tied to that trade since early 2022. (federalreserve.gov) Federal Reserve researchers also said rapid unwinding of basis trades contributed to Treasury market stress in March 2020. In an earlier note, they said hedge fund repo borrowing in the sponsored segment rose by $120 billion between October 4, 2022 and May 9, 2023, while short futures positions in 2-year, 5-year and 10-year contracts rose by $411 billion. (federalreserve.gov 1) (federalreserve.gov 2) Another pressure point is the government’s debt mix. The Treasury Borrowing Advisory Committee said on November 5, 2025 that a higher share of Treasury bills had reduced expected borrowing costs but increased volatility. (home.treasury.gov) Bills mature in a year or less, so they have to be rolled over more often than longer-term notes and bonds. That leaves the Treasury more exposed to swings in short-term funding conditions and investor demand at each auction. (home.treasury.gov) (brookings.edu) Regulators have spent the past few years trying to reinforce the market’s pipes rather than cap borrowing. The Securities and Exchange Commission adopted Treasury clearing rules in 2023 and, in February 2025, pushed the compliance dates to December 31, 2026 for eligible cash trades and June 30, 2027 for eligible repo trades. (sec.gov 1) (sec.gov 2) Central clearing works like a middleman that stands between buyers and sellers, allowing trades to be netted and lowering the amount of balance sheet dealers must use. Brookings estimated in February 2026 that full clearing of primary dealers’ Treasury repo books could free up as much as $1.3 trillion of additional balance-sheet capacity. (brookings.edu) The Inter-Agency Working Group on Treasury Market Surveillance, which includes the Treasury Department, Federal Reserve, Securities and Exchange Commission and Commodity Futures Trading Commission, said in its 2024 staff report that it is pursuing reforms on data, intermediation, trading venue oversight, clearing and leverage. Brookings said those steps can improve resilience, but not replace slower debt growth. (home.treasury.gov) (brookings.edu) The warning is not that Treasuries are suddenly unsafe. It is that the world’s benchmark bond market is being asked to absorb record financing needs with a structure that still depends on dealer balance sheets, repo funding and leveraged buyers staying in the trade. (imf.org) (brookings.edu)