Hedge Fund Treasury Basis Trade Approaching Capacity Limits
Alina Collins
The basis trade — hedge funds' signature arbitrage in U.S. Treasuries — has shrunk by more than $200 billion to roughly $1 trillion, according to Morgan Stanley. The strategy is approaching its maximum capacity, raising questions about who will supply the liquidity it once anchored.
What is the basis trade, and why has it stalled?
The basis trade exploits tiny price gaps between Treasury futures and the underlying bonds, using heavy leverage to amplify slim margins. It has been hedge funds' dominant arbitrage play in the $31 trillion Treasury market.
The gap itself is narrowing. This means → the strategy hasn't broken; the market has closed the seam it relied on.
Morgan Stanley strategist Eli Carter put it bluntly: "Growth in basis-trade size has stalled, suggesting we are close to maximum capacity." Goldman Sachs added that some clients complain "the basis is dead."
Who closed the seam?
The biggest new competitor is Wall Street banks themselves. The Trump administration's deregulation push loosened the enhanced supplementary leverage ratio — eSLR, a rule capping how much risk banks can hold — letting banks load up on Treasuries.
Barclays derivatives-research head Amrut Nashikkar explained: banks hold Treasury longs while shorting futures to hedge, which "is economically equivalent to the basis trade." In plain terms = banks started doing the same job, squeezing out the profit margin hedge funds used to capture.
Bank net-long positions hit a record high earlier this year and remain well above last year's levels.
What other forces are compressing the spread?
Asset managers' demand for Treasury futures cooled during this year's bond sell-off. Fewer buyers means futures deviate less from cash bonds, leaving less to arbitrage.
The U.S. Treasury has shifted borrowing toward short-dated bills, reducing supply dislocations at the long end.
The Fed stopped shrinking its balance sheet, no longer pulling Treasuries out of the market. This reflects three forces — regulatory easing, Treasury issuance strategy, and central-bank policy — all pointing in one direction: a structural narrowing of arbitrage opportunity.
What does this mean for the $31 trillion Treasury market?
The strategy's main players include Millennium Management, ExodusPoint, Citadel, and Capula — large macro and multi-strategy funds that have become critical liquidity providers in recent years.
The March 2020 lesson still looms: hedge funds unwound basis trades en masse during the turmoil, amplifying the sell-off until the Fed stepped in. This means → the basis trade is both a liquidity provider and a potential amplifier of liquidity crises.
If the trade keeps shrinking, who fills the liquidity role it once played remains an open and unresolved question for regulators and markets alike.
Content is for reference only, not financial advice.