When the United States borrows more, someone has to hold the extra bonds. This page asks who that someone is — the Federal Reserve, foreign investors, or everyone else — using named public series, not a vibe.
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“Debt held by the public” is the stock of Treasury securities that is not an IOU from one government account to another. It includes what the Federal Reserve holds. So a rise in that stock is not automatically “the market bought it,” and it is not automatically “the Fed printed.” We split the quarter-to-quarter change into three piles:
| pile | what it is | series |
|---|---|---|
| extra public debt | Change in debt held by the public (includes the Fed) | FYGFDPUN · $mn, plotted $bn |
| Fed | Change in Treasuries the Fed holds outright in its own portfolio | WSHOTSL · $mn Wednesday, plotted $bn |
| foreign | Change in holdings by foreign and international investors | FDHBFIN · $bn, arrives with a lag |
| leftover | Extra public debt minus Fed minus foreign. U.S. banks, money-market funds, pensions, households, state and local governments — plus foreign buying that has not printed yet. A bucket, not a person. | derived |
| overnight cash at the Fed | Not a holding of public debt. Money-market funds parking cash at the Fed overnight. When this falls, that cash often buys Treasury bills instead. Shown as a note, not in the sum. | RRPONTSYD · $bn |
The Fed reports on Wednesdays. The Treasury reports public debt at quarter-end. Foreign holdings arrive later. Leftover is labeled, not forced to zero. No filled-in guesses.
Dotted verticals: early 2018 (the last time the Fed hiked while fiscal conditions were already tight), December 2021 (the Fed signaled the end of easy money), March 2022 (first hike of that cycle).
| date | extra public $bn | Fed | foreign | leftover | Δ overnight at Fed |
|---|
2020 is the easy year. The tall cyan bars are the Fed buying Treasuries in size. Private holders even sold some of what they already owned to the Fed. When the government needed to borrow a great deal, the central bank took the paper.
2022 into mid-2023 is the opposite. Public debt still rose. The Fed’s Treasury holdings fell — it was shrinking the portfolio it had built up. Foreigners reduced their holdings a bit too. So the leftover is larger than the new debt: private buyers took the new bonds and the bonds officials were selling. That is arithmetic, not a glitch.
The most recent four quarters still say leftover is most of the flow. The Fed is a small buyer again, not 2020. Overnight cash parked at the Fed has fallen a long way from its peak; some of that cash likely bought bills, which would show up in leftover, not as Fed buying.
Two cautions. Leftover is a bucket. And the foreign series lags, so some of what looks domestic this quarter may be foreign next revision.
A buyback is a completed operation, not a speech. Treasury publishes each one: date, bucket, cap, and par accepted. Treasury Securities Buybacks. The long-end piece — nominal coupons in the 10-year-and-longer buckets — is one operation. Cash-management buybacks are a different operation: short coupons, one month to two years. Most of the dollars are there. An operation with no accepted par yet is announced, not done, and is left out of the sums.
Dotted line: 8 September 2026, the SMU speech (“I am the house now”). The sums that test the claim start that day, including it. The bars still show the April 2024 restart, so you can see what was already running before he said it. The 2000–2002 buybacks are in the cache and not on these plots.
How much of the existing debt comes due inside a year is the other half of the financing story. A larger short-term share means more of the book has to be refinanced soon, at whatever rate the market is offering. A forthcoming article covers a deliberate shift toward that short end.
The Sustainability Cube is the Treasury’s position: interest versus incoming cash, the gap between new borrowing rates and the rate already on the books, and debt versus the size of the economy. The Fiscal Dominance Cube asks when those same objects start to constrain the Fed. Reference data is the audit trail for every series on this page.