Hedge funds borrow against Treasury securities through repurchase agreements, or repos, to finance bond positions. In a common Treasury cash-futures basis trade, a fund buys a Treasury bond, finances much of it with repo, and shorts a related Treasury futures contract. The goal is to earn a relative-price spread as the two prices converge—not simply to bet that Treasury prices will rise. Leverage can make a small spread worthwhile, but it also makes the position vulnerable to a widening spread, higher margin demands, or disrupted funding.
How does Treasury repo financing work?
The secured loan behind the bond position
A repo is a secured financing arrangement. The fund receives cash and provides Treasury securities as collateral under an agreement to repurchase them later. In the basis trade, the fund uses that cash to pay for much of its Treasury bond position. The bond serves as collateral for the financing; repo is not itself a bet on the bond’s price.
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What the haircut means
The repo lender generally advances less cash than the collateral’s market value. The difference is the haircut, a cushion against a fall in collateral value or other risks. A lower haircut means the fund must contribute less of its own cash to finance the bond, which can increase leverage. A haircut is not the same as the futures margin: the repo haircut applies to the financed bond, while futures margin is cash or eligible collateral posted to support the futures position.
What is the Treasury cash-futures basis trade?
The two positions
The trade combines a long position in a cash Treasury security with a short position in a related Treasury futures contract. The bond is financed through repo; the futures position requires margin. The relevant futures contract must allow delivery of the bond, or of a bond with similar delivery economics, under the contract’s terms.
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As Federal Reserve Board researcher Phillip J. Monin put it in Quantifying Treasury Cash-Futures Basis Trades (March 8, 2024): “The Treasury cash-futures basis trade is a convergence trade that profits off the spread between the price of Treasury futures contracts and the Treasury securities that can be delivered into those futures.”
Where the potential return comes from
The fund is seeking to earn the difference between cash and futures pricing after accounting for the bond’s carry and repo financing costs. If the futures contract is relatively expensive compared with the deliverable cash bond, a short-futures, long-bond position may have a positive expected basis return. The return is not guaranteed: the spread can move against the fund before the prices converge, and financing or other costs can reduce or erase the expected gain.
The calculation is more involved than subtracting two quoted prices. Federal Reserve analysis accounts for the futures invoice price, the cheapest-to-deliver bond, delivery options embedded in the futures contract, accrued interest, bond-specific repo rates, and assumed delivery timing. Those details matter because a futures contract can be delivered against using eligible bonds with different economics.
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Why do hedge funds borrow money to buy Treasury bonds?
To put a small relative-value spread to work at scale
Repo financing lets a fund hold a larger cash Treasury position than it could buy using only its own capital. The short futures leg helps offset some of the position’s exposure to broad interest-rate moves, leaving the fund focused on the relative pricing between the cash bond and futures contract. That hedge is not perfect protection: the basis itself can change, and the two legs have different funding and margin requirements.
When the expected spread is small, financing and futures margin can make the trade attractive to a fund able to manage a large position. A low repo haircut reduces the cash needed to support the bond, while futures margin is small relative to the contract’s notional exposure. Both features can magnify returns on the fund’s capital—and losses if the trade moves adversely.
Why the trade matters beyond the fund
Futures markets can attract investors seeking duration or benchmark exposure. In normal conditions, arbitrage between futures and cash Treasuries connects those markets: basis traders may take the other side in futures while buying and holding the cash bonds. The Federal Reserve and U.S. Treasury have described these activities as potentially supporting Treasury demand, liquidity, market integration, and price discovery. Those benefits depend on stable market and funding conditions; the same leverage that supports a large position can make an unwind disruptive.
How large are these positions?
The figures below come from public-sector estimates with different dates and scopes. The Federal Reserve’s June 22, 2026 note estimates hedge-fund exposures and repo borrowing as of September 2025; its basis-trade estimate is model-based, not a ledger of confirmed individual trades.
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|---|---|---|
| Large hedge funds’ gross Treasury exposures | $4.0 trillion: $2.4 trillion long and $1.6 trillion short | September 2025; Federal Reserve Board estimate in its June 22, 2026 note. The note says the measures had more than doubled since the beginning of 2023, and the 50 largest funds accounted for about 90% of gross Treasury exposures. |
| Hedge-fund repo cash borrowing | $3.0 trillion | September 2025; Federal Reserve Board estimate in its June 22, 2026 note. |
| Cash-futures basis positions | Approximately $830 billion | September 2025; Federal Reserve Board model-based estimate in its June 22, 2026 note. About double the prior early-2020 peak and equal to 35% of hedge funds’ long Treasury exposures. |
| Treasury-collateralized hedge-fund repo borrowing | $553 billion borrowing supported by $9.88 billion in hedge-fund capital; estimated aggregate leverage of 56-to-1 | As of December 2022; historical Federal Reserve estimate, not a current leverage figure. |
| Total hedge-fund borrowing | $5.1 trillion | Second quarter of 2024; Financial Stability Oversight Council estimate, 54% above the third quarter of 2022. This includes borrowing beyond Treasury repo. |
The Federal Reserve notes that Form PF does not report trade-level positions. Its September 2025 basis estimate is therefore an approximation consistent with reported data, not direct confirmation of each fund’s trade. The scale figures describe exposure and borrowing, not a count of identical strategies.
What happens if repo funding dries up?
Pressure on a leveraged position
Stress can arrive through several channels at once. The basis may widen, reducing the value of the relative-value position. Futures margin requirements may rise, forcing the fund to post cash quickly. Repo lenders may charge more, demand additional collateral, or become less willing to lend. A fund that cannot meet those demands may have to shrink or close positions.
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How an unwind can reach the Treasury market
Closing the futures short means buying futures contracts back; reducing the cash leg can mean selling Treasury securities. Those sales can put direct pressure on the cash Treasury market, particularly if many leveraged funds try to deleverage at once. The Federal Reserve has identified basis widening, futures margin increases, and repo disruptions as vulnerabilities. Treasury remarks and the Financial Stability Oversight Council’s 2024 annual report describe the trade’s potential market-functioning benefits in stable conditions while warning that excessive leverage and a rapid unwind can pose financial-stability risks.
What historical haircut data do—and do not—show
In the Federal Reserve’s analysis of qualifying hedge-fund repo borrowing as of December 2022, 73.8% of borrowing volume was reported at zero or negative haircuts. That finding belongs to that historical dataset and methodology; it should not be read as a current estimate of repo haircuts. The same analysis’s borrowing and capital figures are likewise historical, not a current measure of leverage.
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How is a basis trade different from other Treasury strategies?
Hedge funds use repo and Treasury instruments for strategies besides the cash-futures basis trade. The instruments paired and the source of return differ, so repo borrowing or a short Treasury futures position alone does not establish that a fund is running a basis trade.
| Strategy | Paired positions | Main source of return | Key distinction |
|---|---|---|---|
| Cash-futures basis trade | Long cash Treasury, typically financed with repo; short related Treasury futures | Convergence of relative cash and futures pricing after financing and carry | Exposed to basis changes, repo conditions, and futures margin. |
| Swap-spread arbitrage | Repo-financed Treasuries paired with interest-rate swaps | Relative pricing between Treasury yields and swap rates | Uses swaps rather than Treasury futures as the offsetting instrument. |
| Maturity-matched Treasury trades | Offsetting positions in Treasury securities with similar duration, such as on-the-run and off-the-run bonds | Relative pricing between similar-duration Treasury instruments | Does not rely on the cash-bond-versus-futures pairing. |
For September 2025, Federal Reserve researchers estimated approximately $305 billion in swap-spread arbitrage positions, $395 billion in maturity-matched Treasury trades, and $375 billion in steepener-like positions. These are approximate estimates of distinct strategies, not additions to the cash-futures basis estimate.
Why estimates of basis trading are not exact counts
Short Treasury futures positions held by leveraged funds are sometimes used as a proxy for basis trading, but funds may short futures for other reasons, so that proxy can overstate basis positions. Federal Reserve researchers have also used SEC Form PF holdings and repo activity to estimate exposures, and FINRA TRACE cash Treasury transactions marked as part of a series involving a futures leg for a near-real-time proxy. These approaches capture different parts of the activity; none makes every fund exposure a confirmed basis trade.
That is why it is important to distinguish reported fund exposures, estimated strategy positions, and observed transactions. A headline figure for repo borrowing or Treasury futures shorts cannot, by itself, answer how much capital is in the basis trade.
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