Hedge funds have quietly become central players in Treasurys. By the close of 2025, they were sitting on $2 trillion of cash Treasury securities, nearly triple what they held half a decade earlier, according to the U.S. Treasury's Office of Financial Research. With marketable Treasury debt at $28.9 trillion, that put their share at a record 7%.
Why the lane change now? Some long-haul investors have been exploring other opportunities, and that opens room for different buyers to step in as Washington's borrowing needs keep rising. The timing has been spicy too: on Monday the 10-year yield hit its highest point since 2007, and on Tuesday the 30-year reached marks not seen since 2002.
Fresh figures from the Federal Reserve show hedge funds kept accumulating Treasurys during the first half of 2026. Domestic funds added a net $26.4 billion in the first quarter and $60.6 billion in the second, totaling about $87 billion for the period.
Much of that activity is tied to relative-value trades, especially the cash-futures basis: buying a Treasury in the cash market while shorting the matching futures contract to capture tiny price gaps between the two. Because those discrepancies are slim, funds often juice returns with substantial borrowing, frequently through repo markets where Treasurys are pledged as collateral so positions can be scaled many times over the underlying capital.
As rates sold off, there were signs of caution. Morgan Stanley estimates that leveraged Treasury basis positions have retreated by roughly one fifth this year to about $1.2 trillion. That does not automatically mean broad selling of bonds, since the Fed's numbers still show net buying through the second quarter. It does underscore how quickly leveraged exposures can be dialed up or down when conditions change, and how that speed can raise the odds of messy position exits if stress hits.
"Hedge funds apply relatively aggressive leverages as compared to other types of investors and therefore may magnify systematic risk," said Ricky Siao of Union Bancaire Privée. "When forced deleveraging happens due to extreme situations or crisis scenarios, it may result in broader liquidity and financial stability event."
Officials are watching. In its May Financial Stability Report, the Federal Reserve noted that hedge fund leverage remained close to historic peaks and was concentrated among larger players, with those leveraged strategies anchoring sizable Treasury and other positions. "High leverage can lead to spillovers if the fund suddenly loses access to funding," the Fed said. The Bank for International Settlements went a step further earlier this year, warning that hedge funds' growing role as core intermediaries in government bonds had created "new financial stability vulnerabilities," citing heavy use of leverage and short-term repo funding that can amplify sudden deleveraging and market hiccups.
Don Steinbrugge, founder and CEO of Agecroft Partners, flagged the basis trade as the focal hazard. "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," he said. "These trades have thin margins and can often be levered 20 times, if not higher." He recalled that "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 volatility spike can force funds to post more cash or exit trades, pushing prices down, deepening losses, and pressuring others to follow.
Not everyone sees only risk. Ken Heinz, president of Hedge Fund Research, noted that funds willing to trade rather than hold to maturity can provide liquidity on both sides during rallies and selloffs, potentially smoothing rate moves and tamping down volatility. As Steinbrugge put it, "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," adding that their growing role is "both necessary for liquidity and a potential source of systemic risk."
Pension funds historically loaded up on long-dated Treasurys to match far-off liabilities. But the OECD says structural shifts - notably the move from defined-benefit to defined-contribution plans - are cooling their appetite for long government paper. At the same time, some pensions are tilting toward higher-yield, less liquid bets like private credit. According to Mercer, institutional investors directed nearly $300 billion to private credit vehicles in 2025.
Layer on the recent pop in yields and you have a new mix of Treasury buyers. Hedge funds, with performance targets and shorter time horizons, are filling in where some long-term holders have stepped back. As Noah Hamman of AdvisorShares put it: "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."
For everyday investors, the takeaway is simple to track: who owns Treasurys affects how bumpy the ride can get. If volatility flares, leveraged trades are the pressure points that can intensify price swings. That matters whether you hold bonds directly, through a fund, or just rely on them as the steady part of your portfolio.
