Hedge funds have amassed roughly $4.0 trillion of gross US Treasury exposure, including $2.4 trillion of long positions and $1.6 trillion of short positions. They finance those positions with $3.0 trillion in repo borrowing.
The cash-futures basis trade accounts for an estimated approximately $830 billion of that activity, though published estimates range from $350 billion to $1.5 trillion. The trade captures a spread that is often only a few basis points for each unit of capital.
That narrow return has made leverage central to the strategy. The basis trade is levered as much as 50 to 70 times today, below earlier peaks of 175 times on five-year contracts and 120 times on ten-year contracts before post-pandemic margin-requirement tightening.
At 50 times leverage and with a haircut of roughly 1 to 2 percent, a 1 basis point move in yields is worth roughly $500 of profit and loss for every $1 million of face value.
The funding system underneath those positions is vast. The repo market has grown to more than $13.5 trillion in outstanding agreements each day, with about 70% secured by Treasury securities. Financial institutions use it to lend to and borrow from one another, mostly overnight and sometimes for periods such as one week.
Dealers stand between repo lenders and borrowers. Hedge funds also lend cash in the repo market to borrow Treasury securities needed to meet margin requirements on other trades.
Hedge funds' cash Treasury holdings are estimated at $2.0 trillion, about 7% of the roughly $28.9 trillion US Treasury market. They reportedly hold more Treasuries than the combined officially registered holdings of Japanese, Chinese and Saudi Arabian investors.
Foreign official holders, including China, Japan and Gulf sovereign funds, have reduced or held flat their Treasury participation. Foreign Treasury holdings have slipped to about 30 percent, close to the 29 percent low of 2023.
Market conditions have also tightened. On 19 August, thirty-year Treasury yields rose above 5.3 percent, their highest level since 2007. Top-of-book depth has fallen to roughly $1 million, the lowest reading in the series, while the first fixed-income outflows in 24 weeks have begun.
As yields rose, hedge funds cut positions in basis trades involving Treasury securities.
Past exits show the scale of the possible selling. The Commodity Futures Trading Commission estimated that Treasury sales tied to basis-trade exits reached $35–173 billion in March 2020, when hedge-fund futures shorts were reduced by $62 billion. Swap-spread arbitrage unwound approximately $100 billion in April–May 2025.
The trade's central dependency is therefore straightforward: repo borrowing must remain available as positions are rolled over. Whether funding conditions deteriorate far enough to force a wider unwind remains the key question for a Treasury market in which hedge funds have become major holders.
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