MISSION BRIEF
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Between March 19 and May 18, the Bank of Japan liquidated an estimated $63 billion in U.S. Treasury securities — offloaded through its New York custodial accounts in three separate tranches, timed to coincide with interventions in the yen-dollar cross — while China's People's Bank, moving through its custodial chain at the Federal Reserve Bank of New York, brought its direct Treasury exposure down to $652.3 billion, the lowest level since September 2008. Both central banks were not rotating out of dollar assets because they wanted to. They were selling because they had to.
The forcing mechanism was oil. U.S. and Israeli strikes against Iran, launched February 28, produced what Iran's new Supreme Leader Mojtaba Khamenei immediately weaponized: a declared closure of the Strait of Hormuz, with Iranian Revolutionary Guard vessels and drone strikes disabling or deterring traffic through the 21-mile chokepoint that normally carries 27% of global seaborne crude. For Japan — which imports nearly all of its oil and routes the overwhelming share of it through the Gulf — this was not an energy inconvenience. It was a currency crisis arriving in real time.
The yen and other Asian currencies cratered as the region's import bills exploded, and central banks that had spent years accumulating dollar reserves as a buffer against exactly this kind of shock now found themselves burning those reserves to defend their exchange rates. Japan sold Treasuries to buy yen. The Bank of Korea sold Treasuries to support the won. India rotated part of its $680 billion reserve pile to manage the rupee. The selling was not coordinated — but it landed at the same address. Every dollar of intervention hit the U.S. long-bond market from the demand side.
The Treasury International Capital data released May 19 — covering March 2026 — showed total foreign holdings fell from $9.49 trillion to $9.25 trillion in a single month, a $240 billion drawdown in 30 days. Foreign official institutions — meaning central banks, not private funds — accounted for $46.1 billion of net selling in February alone, before the March data confirmed the acceleration. The last time foreign holdings contracted at this velocity was April 2020. The cause then was pandemic panic. The cause now is a war that is still not over.
Brent crude settled at $103.54 on Friday — down from a peak near $114 in March but still more than 30% above where it traded on February 27, the day before the first strikes. Talks between Washington and Tehran on reopening the strait are described by Secretary of State Rubio as showing "good signs." Iran is demanding reparations for destroyed power plants. The strait remains closed.
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THE OPERATION
Two converging fronts
The Treasury market absorbed this foreign selling the way a sponge absorbs water — right up until it couldn't. The May 12 auction of $42 billion in 10-year notes cleared at a yield of 4.468%, with a bid-to-cover ratio of 2.13 — the weakest since the auction series was upsized in early 2025, and down from 2.45 in March. The tail — the gap between where dealers expected to clear and where they actually did — came in at 5.5 basis points, nearly eight times the 0.7 basis point tail recorded in the same auction in March. Dealers absorbed the spread. Primary dealers always do. That is what they are there for. What it means is that the private market refused to pay what the government needed to receive, and the dealers ate the difference — and will reprice that risk into everything they touch for the next 90 days.
Meanwhile, the 30-year auction on May 13 — $25 billion priced at a high yield of 5.046% — cleared with a bid-to-cover below its six-month average and a tail above it. Rick Santelli graded it a C-minus. The Federal Reserve's own analysts, in the October 2025 report on Cayman-domiciled hedge funds, had already flagged that TIC data undercounts Treasury basis-trade exposure by roughly $1.4 trillion — positions that are long the physical bond and short the futures contract, financed with overnight repo, and violently sensitive to any spike in funding costs or sudden need to liquidate. Those positions are still on.
China's direct holdings have now fallen 42% from their November 2013 peak of $1.32 trillion. The pace has accelerated since the war started.
The 10-year yield has repriced from 4.217% in March to 4.468% in May — a 25-basis-point move in 60 days — while the Treasury simultaneously increased auction size from $39 billion to $42 billion to cover a deficit that the Hormuz-driven oil shock is actively inflating. Energy imports cost more. Import prices pass through to CPI. CPI printed at 3.8% year-over-year in April. The Fed cannot cut into that number. The Fed cannot cut while the 30-year is at 5%. And the Treasury cannot stop issuing because the math does not allow it.
Foreign official institutions have been net sellers of U.S. Treasuries in four of the last five months of available TIC data. The total foreign share of marketable Treasury debt outstanding has declined from a peak of roughly 50% in 2008 to approximately 28–30% today — meaning the domestic market, already carrying the Fed's post-QE runoff, is being asked to absorb more supply with less foreign help, at the precise moment that inflation prevents the Fed from re-entering as buyer of last resort.
The UK added $29.6 billion to its holdings in March, bucking the trend — London dealer-custody flows absorbing what Tokyo and Beijing were putting down. One buyer stepping into a gap that used to be filled by two of the largest creditors on the planet.
RULES OF ENGAGEMENT
Your exposure
The national average for a gallon of regular gasoline stood at $4.56 as of May 21, according to AAA — the highest Memorial Day price in four years, up $1.38 from this time last year, and nearly double the $2.81 national average recorded in January when the Strait was still open. Every state in the country recorded double-digit percentage increases over the past twelve months. California hit $6.16. Oklahoma, the cheapest state in the union, crossed $3.98. The EIA's weekly series for regular unleaded, updated May 19, confirmed the national average at $4.49 — with gasoline inventories down for fourteen consecutive weeks as refineries run near capacity on Strategic Petroleum Reserve feedstock and shift yield toward diesel and jet fuel to prevent outright shortages in commercial transport.
The mortgage rate channel is now open. The 10-year Treasury yield is the anchor for the 30-year fixed mortgage rate, and every 25-basis-point move in the 10-year adds roughly 25 basis points to what a buyer pays to finance a home. The 10-year has moved 25 basis points in 60 days — against a backdrop of deteriorating auction demand, rising deficit issuance, and a Fed that cannot provide cover. The 30-year fixed rate, which ended 2025 near 6.8%, has not retreated. The housing market, which needed rate relief to unlock inventory, is not getting it. The lock-in effect is locked in.
The April CPI print of 3.8% year-over-year — up from 0.6% month-over-month after a 0.9% print in March — means the inflation shock from the Hormuz closure is still arriving at the consumer level. Energy and food import prices move with a lag. The worst of the March oil spike has not yet fully shown up in the grocery aisle.
You are paying $4.56 a gallon to drive to work because a central bank in Tokyo sold Treasuries to defend its currency, because Iranian drones shut a strait that carries more than a quarter of the world's seaborne oil, which pushed the import bill so high for energy-dependent Asian economies that their central banks had no choice but to liquidate the very bonds that anchor your mortgage rate — and the bid-to-cover on those bonds just hit its weakest reading in over a year, which means the market is demanding more yield to absorb the supply, which means your cost of borrowing is going up, at the same time your cost of driving already did. The anchor is dragging. The TV said it was seasonal factors.
