US Treasury basis trade shrinks to its smallest size in over two years

One of Wall Street’s favorite money machines is running low on fuel. The US Treasury basis trade, a leveraged strategy that has generated enormous returns for hedge funds in recent years, has contracted to its smallest size in over two years, according to Bloomberg.

The numbers tell a clear story. The notional value of the trade fell from $1.26 trillion at the start of 2026 to approximately $900 billion by September of the same year, based on data from Morgan Stanley. That is a drawdown of more than $300 billion in under a year.

What the basis trade actually is

Think of the basis trade like arbitrage at a farmers market. If apples sell for $1 at one stall and apple futures contracts imply a price of $1.02, a savvy trader can pocket the difference by buying the physical apple and simultaneously selling the future. The Treasury basis trade works on the same principle, exploiting tiny price gaps between physical US government bonds and the futures contracts tied to them.

The catch is that those gaps are genuinely tiny, measured in fractions of a percentage point. To generate meaningful returns, funds borrow heavily to amplify their positions, sometimes by a factor of dozens to one.

Firms like Millennium Management, Citadel, ExodusPoint, and Capula Investment Management have all been active participants in this strategy. At its peak during mid-2026, the collective size of these positions approached $1 trillion.

Hedge funds have now unwound more than $200 billion in leveraged positions over a relatively short window.

Why the trade is shrinking

The contraction does not appear to be a story of panic or distress. Citigroup strategist Jason Williams framed the retreat more soberly, describing declining basis trade positions as a sign of tighter opportunity sets rather than market dysfunction.

What this means for the Treasury market

For bond market participants, the basis trade contraction carries implications that extend beyond hedge fund profit-and-loss statements. Basis traders are significant buyers of physical Treasuries, so a reduction in their activity removes a consistent source of demand from the market.

The Federal Reserve and Treasury Department have both kept a close eye on this trade since the March 2020 episode, when a chaotic unwind of basis positions contributed to severe dysfunction in Treasury markets and ultimately required emergency central bank intervention.

The trajectory from $1.26 trillion to $900 billion in a single year also serves as a reminder of how rapidly the fixed-income landscape can shift when a crowded strategy begins to unravel. Basis trade positions had grown from roughly $830 billion in September 2025 to their early-2026 peak before reversing course.

Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.