The Hidden Risk in the U.S. Treasury Bond Market: Hedge Funds, Leverage, and Basis Trades

The foundation of the global financial system is U.S. Treasury bonds, which are supposedly the safest investment on the planet. But a growing share of these bonds is now held by offshore hedge funds running enormous, highly leveraged, daily-rolled bets that only work if nothing goes wrong. This video explains the mechanics of the problem, piece by piece.

The Shift in Who Buys U.S. Debt

For decades, foreign central banks bought U.S. Treasury bonds and held them long-term because the U.S. was stable, predictable, and always paid its debts. That is changing. With U.S. debt exceeding $36 trillion and increasingly erratic policy decisions, foreign central banks are backing away. They are selling their holdings and looking elsewhere.

So who is picking up the slack? In mid-October, the Federal Reserve discovered a massive undercounting of Treasury bonds held by hedge funds domiciled in the Cayman Islands. The estimate had been around $600 billion. The actual number: $1.8 trillion. These funds constitute 67% of the $29 trillion Treasuries market and absorbed 37% of new Treasuries issued between 2022 and 2024. They are now the largest foreign holder of U.S. debt, ahead of China and Japan.

How the Leveraged Basis Trade Works

These hedge funds are running something called a leveraged basis trade. Here is the simplified version:

1. A hedge fund puts down $2 million of its own money and borrows $98 million from a bank to buy $100 million in Treasuries. That is 98% leverage, which is now average for these trades.
2. The fund posts the bonds as collateral for the $98 million loan, paying roughly 5% interest.
3. The fund sells a futures contract to deliver that bond at a fixed price in about three months. The futures price is typically slightly higher than the current price because bonds yield interest.
4. The spread between borrowing cost (5%) and futures yield (5.15%) gives a profit of 0.15%, or $150,000 on a $100 million position.

That profit is tiny, which is why these funds need massive amounts of capital and constant rolling of positions. They do it every day, over and over.

What Could Go Wrong

The 2020 COVID crisis showed what happens when this unwinds. Everyone rushed for cash. Banks stopped lending overnight. Hedge funds running these exact basis trades were forced to dump Treasury holdings to pay back their loans. The selling became a stampede, prices crashed, and the Federal Reserve had to buy over $1 trillion in bonds to stop the cascade.

The current situation is worse: two times the amount of borrowed money versus directly invested capital, and three times the Treasury volume tied up in basis trades compared to 2020.

The Standing Repo Facility Warning Sign

After the 2020 crisis, the Fed created the Standing Repo Facility (SRF) as a lender of last resort for banks needing overnight loans when normal lending markets dry up. It was created in 2021 and saw virtually no usage until recently.

Since September, the SRF has seen activity almost every day. On Halloween, banks borrowed $50 billion in a single day, a record. They are borrowing from a facility with higher interest rates than the open market supposedly offers, which suggests normal lending channels are either unwilling or unable to handle the demand.

What to Watch For

Several catalysts could tip this into a selling spiral:

• A major hedge fund, private lender, or bank failing
• A continued spike in overnight lending rates
• A sharp, unexpected move in bond prices triggered by new government data
• A poor debt auction after a government shutdown
• Contagion from another market (stocks, the AI bubble, crypto, or commercial real estate) that forces funds to liquidate

If a wave of forced selling hits, the cascade through the Treasury market would be severe.

Key Takeaways

• Offshore hedge funds in the Cayman Islands hold $1.8 trillion in U.S. Treasuries, far more than previously estimated
• These funds run leveraged basis trades at 98% borrowing, making tiny profits that require massive scale and daily rolling
• The Fed's Standing Repo Facility is seeing record usage, suggesting stress in overnight lending markets
• Current leverage levels are significantly higher than during the 2020 crisis, when the Fed had to buy over $1 trillion in bonds to prevent collapse