The consensus on foreign central bank Treasury holdings tends to focus on the headline number: sovereign buyers are retreating. That read is accurate as far as it goes, but it stops precisely where the more consequential story begins. According to US Treasury Department TIC data, foreign official holdings dropped to $3.77 trillion in July, roughly where they stood in 2012, even as the total stock of marketable Treasury securities has roughly tripled over that period. Their share has collapsed from 34% in 2012 to 12.8% in July, the lowest since 1993. What the sovereign-retreat narrative conveniently glosses over is who moved in behind them.
Foreign Central Bank Treasury Holdings: The Sovereign Exit in Numbers
The retreat is not uniformly distributed. Japan shed $13 billion in July alone, and between February and July reduced its Treasury holdings by $135 billion, largely to fund yen-support interventions in currency markets. The mechanics are worth understanding: Japan sold Treasuries to obtain dollars, sold those dollars to buy yen, and because many of the sold securities were near maturity and therefore close to face value, the dollar-term losses from higher yields were limited. In yen terms, the trades were highly profitable, given the yen’s substantial depreciation since the original purchases were made.
Mainland China and Hong Kong, taken together, have been on a consistent selling programme since 2015. July brought another $13 billion reduction, taking the 12-month total to $67 billion and the cumulative decline since the 2015 peak to $587 billion. Their combined share of marketable Treasuries outstanding now sits at 3.0%, a level that can fairly be described as inconsequential in systemic terms.
Other country-level moves are harder to interpret cleanly. Canada’s holdings swung by $33 billion in a single month, largely reversing a spike from the month prior. France saw a $42 billion decline from record levels, to $348 billion. The volatility in some of these series raises legitimate questions about whether the data reflects genuine portfolio decisions or noise in cross-border attribution.
The Cayman Islands Problem Is Larger Than the Consensus Appreciates
While sovereign holdings contract, the slack is being taken up by entities that are foreign in registration only. The seven largest financial centres combined held $3.28 trillion in Treasuries, representing roughly 35% of all foreign holdings. The Cayman Islands alone accounted for $460 billion in the TIC data, a figure that almost certainly understates the true exposure of US-domiciled hedge funds running the Treasury basis trade.
According to a Federal Reserve FEDS Notes analysis, Cayman-domiciled hedge funds purchased, on net, $1.2 trillion of Treasury securities between January 2022 and December 2024, bringing their estimated holdings to $1.85 trillion by end of 2024. The same analysis found that the gap between the TIC-reported Cayman figure and the estimate derived from Form PF data had widened to nearly $1.4 trillion by end of 2024. In plain terms: a substantial portion of what TIC counts as foreign private holdings is, in economic substance, the highly leveraged positions of US-based funds operating through offshore vehicles.
The basis trade itself involves buying Treasuries and selling Treasury futures against them, capturing the price differential. The strategy is sensitive to funding conditions and was at the centre of the March 2020 Treasury market dislocation, when forced deleveraging caused a near-seizure in what is supposed to be the world’s deepest and most liquid market. The exposure is now materially larger than it was in 2020.
The concern extends beyond the Fed’s internal research. Yahoo Finance has reported that hedge funds doubled their presence in the Treasury market over the past four years, a development that has raised specific concern among US officials. The concentration of leveraged, potentially correlated positions in a single instrument class is precisely the kind of second-order risk that does not show up in the top-line foreign holdings figure.
Norway’s Government Pension Fund Global, which holds $2.3 trillion in assets under management, is a reminder that not all foreign private holders are basis traders: its fund manager has proposed reducing bond holdings generally, with cuts to Treasury positions potentially reaching $80 billion. That is a deliberate, disclosed, long-only allocation shift. It sits in the same “foreign private” bucket as the Cayman leverage, a conflation the TIC data does nothing to resolve.
The share of total foreign holdings as a proportion of all marketable Treasuries outstanding fell to 31.9% in July, matching near-record lows touched briefly in 2020. The sovereign retreat is real. The replacement buyers are more fragile, more leveraged, and structurally harder to see clearly. That is where the consensus is currently under-invested in scrutiny.
