Cayman Islands Tops U.S. Treasury Holdings as Fed Exposes $1.4 Trillion Data Gap

TLDR:

• The Cayman Islands officially holds $427 billion in U.S. Treasuries, but Fed research puts the true figure far higher.
  
• Fed researchers identified a $1.4 trillion undercount, making the Cayman Islands the largest foreign Treasury holder.
  
• Hedge funds domiciled in the Cayman Islands absorbed 37% of all net Treasury issuance between 2022 and 2024.
  
• Unlike central banks, hedge funds can exit Treasury positions rapidly, posing a risk to U.S. debt market stability.

The Cayman Islands, a Caribbean territory with just 90,000 residents, holds more U.S. Treasuries than Japan or China.

Federal Reserve researchers have found that official data undercounts the island’s actual holdings by $1.4 trillion. This discovery reshapes long-held assumptions about who finances American debt.

For decades, analysts pointed to Asian economic giants as the backbone of Treasury demand. The real picture, however, tells a different story entirely.

Hedge Funds Drive Cayman Islands’ Treasury Holdings Beyond Official Figures

Official records place Cayman Islands holdings at $427 billion, ranking it sixth among foreign holders. Japan leads on paper at $1.22 trillion, followed closely by China.

However, Fed researchers determined the official count misses over $1.4 trillion in actual Cayman-linked purchases.

The reason behind this gap is structural. The Cayman Islands serves as the legal domicile for roughly three-quarters of the world’s offshore hedge funds.

When those funds buy Treasuries, the purchases register under the Cayman Islands, regardless of where the fund managers actually operate.

Between 2022 and 2024, hedge funds domiciled there purchased $1.2 trillion in Treasury securities. That figure absorbed 37% of all net issuance during that period. As @BullTheoryio noted, that is nearly equal to what all other foreign investors combined purchased.

After the Fed’s adjustment, the Cayman Islands surpasses Japan, China, and the United Kingdom combined. This makes a nine-square-mile island the single largest foreign financier of U.S. government debt today.

Treasury Market Stability Faces Questions as Hedge Fund Exposure Grows

Central banks and sovereign wealth funds tend to hold Treasuries as long-term reserve assets. They rarely exit positions abruptly, even during periods of market stress. Hedge funds operate under an entirely different framework.

These funds carry leveraged positions and answer to performance mandates, not policy goals. They have no obligation to remain invested when market conditions shift against them. That difference matters greatly when the largest buyer controls such a large share of demand.

In April 2025, a sudden tariff announcement triggered simultaneous unwinding across multiple funds. That coordinated exit added pressure across the entire Treasury market at once. The event exposed just how quickly this pool of demand can reverse.

The Fed’s own paper concluded with a direct warning directed at analysts and policymakers. Researchers wrote that “data users should be aware that this major gap exists.” That single line carries weight given the scale of the miscounting involved.

The Cayman Islands’ GDP stands at $7 billion, yet funds registered there finance positions worth many times that figure overnight.

The concentration of leveraged, short-term capital in one jurisdiction now sits at the center of U.S. debt market dynamics.

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