Who Is Actually Buying U.S. Debt Now
The composition of who buys U.S. government debt has shifted materially over the past decade. The GAO’s March 2026 federal debt management report (GAO-26-107529) maps those shifts in detail — and the pattern that emerges is not simply reassuring.
In fiscal year 2014, primary dealers — the 26 designated banks and securities firms required to bid at every Treasury auction — purchased 42 percent of notes, bonds, and similar coupon securities at auction. By fiscal year 2025 that share had fallen to 14 percent. The gap was filled by investment funds, which went from a minority position to majority control, now accounting for over 70 percent of note, bond, and TIPS auction awards.
Investment funds include domestic money market funds, mutual funds, hedge funds, money managers, and investment advisors. As of September 2025, they were the largest purchaser at auctions across every Treasury security type. Their share of bill auctions reached 47 percent. For TIPS and longer-duration instruments, the dominance was even more pronounced. As of February 2026, money market fund investments stood at an all-time high of $8.3 trillion, with more than 80 percent ($6.8 trillion) held in government-only funds investing primarily in Treasury securities and related collateral.
The 2016 SEC money market fund reforms accelerated this shift structurally. By exempting government money market funds from certain requirements applied to other fund types, the rules made government funds comparatively more attractive, pulling assets from other categories into Treasury-heavy vehicles. The GAO describes this as a structural change in investor demand — not a cyclical one.
The price sensitivity problem
The composition shift matters because investment funds, as the GAO and TBAC analysis both note, are generally more price sensitive than other categories of Treasury buyers. Foreign official investors — central banks managing reserve portfolios — tend to prioritize safety and liquidity over yield maximization. Pension funds and insurance companies have long time horizons and regulatory obligations that keep them anchored to Treasury holdings regardless of short-term yield movements.
Investment funds operate differently. They are responsive to relative value. If yields on Treasuries become unattractive relative to alternatives, fund managers adjust. As they now constitute the dominant buyer class at auction, their yield expectations increasingly set the clearing rate. If their bids require higher yields than a more price-insensitive buyer base would have accepted, Treasury’s borrowing costs rise.
Foreign demand: still present, but smaller
Foreign investors held about 33 percent of Treasury securities outstanding as of September 2025, down from 49 percent in September 2013. Their auction participation has been relatively stable in dollar terms but has declined as a share as domestic fund purchasing expanded. The top foreign holders as of January 2026 were Japan ($1.225 trillion), the United Kingdom ($895 billion), and China ($694 billion). Foreign private holdings surpassed foreign official holdings in 2023, meaning the more price-sensitive segment of foreign demand is now the larger one.
Hedge funds: the opacity problem
The GAO flags a data quality issue that has real analytical significance. The household sector in Federal Reserve holdings data is a residual category that inadvertently captures large amounts of foreign hedge fund holdings, particularly from funds domiciled in the Cayman Islands. Federal Reserve supplemental data estimate that domestic and foreign hedge funds combined held approximately $2.6 trillion of Treasury securities as of June 2025 — a substantial and increasingly important buyer class whose behavior under stress is volatile by design.
The investor base is broad. It is also more price-reactive than it used to be. That distinction will matter when the next shock arrives.