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Monday, July 13, 2026

Every position resets before sunrise on borrowed money.

Two Fed research teams published separate papers weeks apart. Both pointed to the same thing. Fifty hedge funds now sit at the center of the Treasury market. They borrow $1.8 trillion overnight to buy the bonds that traditional buyers stopped absorbing.

This is not a warning. It is a description of how the system works right now.

The first paper came from the Federal Reserve Board on June 22. It measured $830 billion in a single borrowed-money trade called the basis trade. The second came from the Dallas Fed on May 28. It found the borrowing behind these trades has grown large enough to shift the Fed's own rate benchmarks. The measured effect: 10 to 20 basis points.

Two different teams. Same structure. Same conclusion.

The Treasury market's marginal buyer is not a pension fund or a foreign central bank. It is a small group of hedge funds borrowing overnight at near-zero collateral. Their demand absorbs what traditional buyers left behind. The Fed's own research shows the borrowing is now so large it moves the rates the Fed itself targets.

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The U.S. government sells a lot of debt. Outstanding Treasury notes and bonds have grown roughly ninefold since 2000. The buyers who used to absorb that debt did not keep up.

Foreign reserve managers grew their holdings about sevenfold over the same period. Domestic funds like pensions and insurers grew theirs only fourfold. Every year, the gap between issuance and buyer capacity widened.

That gap accelerated recently. Foreign holders owned roughly half of all Treasuries a decade ago. By December 2025, that share had fallen to 31 percent. The two largest foreign holders led the pullback. China cut its holdings to $652 billion, an 18-year low. Japan sold $47 billion in a single month.

Someone had to fill the hole. Fifty hedge funds did. In 2014, they held about $600 billion in Treasuries. By the end of 2025, that figure reached $2.4 trillion. They now hold 8.5 percent of all outstanding Treasuries. About 90 percent of that sits in those fifty funds.

Observation: Foreign holders dropped from roughly half of all Treasuries to 31 percent while issuance grew ninefold since 2000.
Interpretation: The gap between government borrowing and traditional buyer capacity created a vacuum. Borrowed-money hedge funds filled it and became the marginal buyer the system depends on.

The trade at the center of this is called the basis trade. It works like a simple machine with three moving parts.

A hedge fund buys a Treasury bond and sells a futures contract on it at the same time. The futures price is usually slightly higher. The difference is the "basis." It is tiny. A few basis points at most.

To make that tiny spread worth anything, the fund borrows heavily in the repo market. Repo is short for repurchase agreement, an overnight loan where the bond itself serves as collateral. The fund rolls this loan every day.

The borrowing is extreme. The Fed's June paper found these repo loans carry low or zero haircuts. A haircut is the discount between the bond's value and the loan amount. Zero haircut means the fund borrows the full face value of the bond. The Atlantic Council reported in January that leverage ratios hit eight times net asset value. That was the highest since tracking began in 2013.

Think of it like a bridge built from borrowed scaffolding. Each piece is light. The structure holds because every piece stays in place. But none of it is bolted down. Every piece has to be re-borrowed by morning.

The Dallas Fed measured hedge fund repo borrowing at roughly $1.8 trillion by late 2025. The cash providers, mostly money market funds and banks, cannot expand lending fast enough. Money market funds face regulatory caps. Banks add repo capacity only when spreads stay high for a long time. Supply is tight. So $1.8 trillion in daily borrowing demand pushes up the cost of overnight money.

The Dallas Fed estimated this widened the gap between two key rates by 10 to 20 basis points. The secured rate is what borrowers pay when they post a bond as collateral. The unsecured rate is what they pay without collateral. The Fed targets the unsecured rate. Collateralized borrowing floods the overnight market at $1.8 trillion a day. That pushes the secured rate away from the Fed's target. The trade is not just filling a buyer gap. It is shifting the plumbing of monetary policy.

Observation: Hedge fund repo borrowing reached $1.8 trillion by late 2025.
Interpretation: The borrowing underneath the basis trade is now large enough to shift the spread between secured and unsecured rates by 10 to 20 basis points. The lenders funding it cannot expand fast enough to absorb the demand.

This structure has broken before. In March 2020, the COVID panic hit the Treasury market. Repo lenders pulled back. Funds that needed to roll their loans every morning could not get funded. They sold bonds to repay lenders. That selling drove prices down. Lower prices triggered margin calls on other funds in the same trade. The spiral fed itself. The Fed bought $1.6 trillion in Treasuries over several weeks to stop it.

The Fed's June paper noted the basis trade today is roughly double its early-2020 peak.

It cracked again in April 2025. Tariff announcements triggered a sharp jump in Treasury yields. A related borrowed-money position, the swap spread trade, unwound by $60 billion. Another $40 billion followed in May. The structure bent but held.

The trade itself is not the problem. The Fed's paper is clear on this. The basis trade keeps futures prices aligned with cash prices. It absorbs supply at bond auctions. The issue is scale, concentration in fifty funds, and overnight funding underneath all of it.

Observation: In March 2020, the basis trade unwound at roughly half its current size, and the Fed bought $1.6 trillion in Treasuries to stop the spiral.
Interpretation: When repo lenders pull back, funds cannot roll overnight loans. They sell bonds to cover. Falling prices trigger margin calls on other funds in the same trade. The spiral feeds itself until a buyer large enough steps in.

The signal to watch is the gap between secured and unsecured overnight rates. SOFR, the Secured Overnight Financing Rate, is the secured benchmark. It stood at 3.62 percent as of July 7. The Dallas Fed's 10 to 20 basis point finding reflects a structural shift, not a one-day event. Borrowing demand has outgrown the capacity of the lenders. That pressure is built into the current structure.

The concentration matters. Ninety percent of this exposure sits in fifty funds. The plumbing runs from their repo desks through money markets to the rates the Fed targets. March 2020 showed what happens when one link in that chain breaks. The chain is now twice the size it was then.

Two Fed research teams, weeks apart, mapped the same structure. Fifty funds borrow $1.8 trillion every night to hold the bonds the system depends on. That borrowing is large enough to move the rates every portfolio is built on. That is worth watching.

The Treasury market's marginal buyer is concentrated in fifty funds, funded overnight at near-zero collateral. Two Fed papers confirmed the scale and measured its effect on the rates the Fed controls. That is where the system stands.

Until next time,
The Navigator