Fed's Record $37 Billion Single-Day Purchase Fails to Arrest US Treasury Selloff
Primary dealers stopped making markets in off-the-run Treasuries during the week of August 10 as reserve managers, mutual funds and hedge funds all sold simultaneously.
The Trump administration's surprise decision to increase buybacks of longer-dated US Treasuries briefly pushed bond prices higher, but the move reversed within a single session, leaving the 30-year yield still up 6 basis points from pre-intervention levels, Adam Tooze's Chartbook reported on August 22.2
The underlying conditions resisted the effort. During the week of August 10, primary dealers stopped making markets in off-the-run Treasuries as liquidity deteriorated across several consecutive sessions. The situation was serious enough that the Federal Reserve convened an emergency meeting on Sunday (2026-08-16). Chair Powell identified restoring Treasury market function as the central purpose of that meeting, according to reporting by Robin Wigglesworth.3
The selling pressure that prompted the emergency was simultaneous across major holder categories. Global reserve managers sold $290 billion in Treasuries, Wigglesworth reported. Mutual funds unloaded $270 billion. Hedge funds sold at least $180 billion, with the actual total likely higher given the difficulty of tracking leveraged positions in real time. One trader described conditions to Nick Timiraos as "absolutely one-way traffic, and everybody was a seller."3
The Fed's response escalated beyond its initial repo operations. Dallas Fed President Lorie Logan disclosed that the central bank purchased $37 billion in Treasuries on Friday (2026-08-21) alone — three times its prior single-day record, a mark that had stood since the acute phase following the 2008 financial crisis. Repo facilities had already been running before those outright purchases.3
Treasury Secretary Scott Bessent moved in parallel. Acting in what Foreign Policy described as a posture befitting the most economically interventionist US administration in half a century, Bessent announced an intention to increase buybacks of longer-dated bonds, a mechanism designed to reduce supply at the long end of the curve and support prices. Reserve managers, mutual funds and leveraged accounts selling simultaneously do not respond to changes in buyback volumes, as the one-session price reversal showed.1,2
The fiscal backdrop that has unsettled large holders is not abstract. US national debt topped $40 trillion during the week of August 17, Foreign Policy reported. The federal deficit for fiscal year 2026 stands at $1.8 trillion with several months still to run. Interest payments alone are running at roughly $1 trillion for the fiscal year to date. Total debt has risen by $4 trillion since President Trump took office last year.1
Interest rates across global bond markets have been rising as tens of trillions of dollars of fixed-interest securities reprice at lower prices, Tooze noted in Chartbook 469, published August 23. The US Treasury market is where that dynamic carries the most weight. It sets the reference rate for dollar-denominated borrowing globally and serves as the primary collateral for leveraged positions across asset classes. When dealers pull back from off-the-run paper, as they did during the week of August 10, the pressure extends well beyond government bonds.4,3
The Logan disclosures map an escalating intervention sequence: repo operations first, then $37 billion in outright purchases on Friday (2026-08-21), then the Bessent buyback announcement. None of those steps held the market for more than a day. The DXY dollar index stood at 98.84 as of August 23, and VIX was quoted at 15.13 as of the same date — neither level reflecting the disorderly conditions described in Logan's account. Bond desks will be watching whether that gap closes when markets reopen the week of August 24, and how far the Fed is prepared to push outright purchases before the scale of the intervention itself becomes the subject of scrutiny.3,2