NEW YORK—The hedge fund strategy that turned small pricing gaps between Treasury futures and cash bonds into a trillion-dollar enterprise is running out of room. Morgan Stanley estimates the amount of capital locked in leveraged basis trades has declined by more than $200 billion, falling to $1 trillion in recent months—a drop that marks the first sustained contraction in a trade that became one of the defining structural features of the $31 trillion U.S. government bond market.
The basis trade works by exploiting the price difference between a Treasury futures contract and the underlying cash bond. Because those gaps are tiny—measured in fractions of a cent—funds use heavy leverage, typically borrowed through repurchase agreements, to scale the bet into meaningful returns. The trade requires both an active futures market and persistent pricing dislocations between the two instruments to generate yield. Right now, both conditions are deteriorating simultaneously.
"The stalled growth rate in the size of the basis trade suggests that we've almost reached max capacity," said Eli Carter, a U.S. rates strategist at Morgan Stanley. Carter's assessment is backed by two concurrent data signals: a pullback in repo funding activity—the short-term borrowing market hedge funds use to obtain leverage—and a decline in their short futures positions, which are the other leg of the trade.
Chris Horvatin, a managing director at Goldman Sachs who oversees the bank's U.S. repurchase agreement business, described a client base losing conviction. Some of his clients were "bemoaning that the basis is 'dead' and not really offering that much of an attractive opportunity," Horvatin said. A Goldman managing director running the repo desk calling a trade dead is not a routine remark—repo desks profit when those trades are active.
Four structural factors are converging to compress the spreads that make the basis trade viable. First, Wall Street banks have rebuilt their Treasury holdings after years of keeping balance sheets lean, absorbing supply that previously required hedge fund intermediation. Second, demand for Treasury futures from asset managers has cooled during this year's bond selloff, reducing the premium embedded in futures contracts that hedge funds exploit on the short side. Third, the U.S. government has tilted its borrowing toward short-term bills rather than longer-dated notes and bonds, shifting the composition of supply in ways that reduce long-end dislocations. Fourth, the Federal Reserve has stopped shrinking its balance sheet, removing a source of scarcity in the cash bond market that widened basis spreads.
The strategy's most prominent players have historically included large macro funds and multi-strategy platforms—Millennium Management, ExodusPoint Capital Management, Citadel and Capula Investment Management among them. Representatives for all four firms declined to comment. Their reticence is consistent with the opacity these funds maintain around book composition, but the aggregate repo and futures data Carter cited at Morgan Stanley captures the footprint of the trade even without individual fund disclosures.
The scale of the pullback carries real consequences for Treasury market function. Hedge funds running basis trades have served as the primary liquidity providers in the cash-futures nexus, standing ready to buy cash bonds and short futures—or vice versa—whenever pricing drifts out of line. That role kept arbitrage tight and execution costs low for every other participant in the $31 trillion market. As that capital base shrinks, the shock-absorber capacity shrinks with it.
Regulators flagged this dependency repeatedly over the past five years. Their warnings proved prescient in March 2020, when hedge funds furiously unwound basis trades in the face of COVID-driven market turmoil. The unwind amplified the selloff rather than dampening it, forcing the Federal Reserve to intervene directly as a backstop buyer. The episode became the textbook case for why a market structure built around leveraged arbitrage creates fragility rather than resilience.
The current slowdown is structurally different from a forced unwind. Funds are not blowing out of positions under duress—they are choosing not to add new ones because the return profile no longer justifies the capital cost and the operational complexity of maintaining repo lines. That distinction matters: a gradual capacity ceiling is far less disruptive than a sudden exit. But it leaves an open question about who provides the cash-futures arbitrage function at scale if basis traders step back.
Wall Street banks rebuilding their Treasury portfolios may partially fill the gap. Banks operate under different capital rules than hedge funds and do not rely on repo leverage in the same way, which makes their presence in the market more stable but also more passive—they buy and hold rather than continuously arbitrage. That shift in the marginal buyer's identity changes how quickly dislocations get corrected when they appear.
Duration risk across the Treasury curve remains elevated. The long end of the market has faced consistent selling pressure, driven by inflation concerns and skepticism about fiscal sustainability, making the cash bond leg of the basis trade more volatile and harder to hold. Higher volatility on the cash side increases the margin requirements on the futures leg and compresses the window in which the trade is profitable—a dynamic that directly explains the declining short futures positions Carter's team tracked at Morgan Stanley.
The $1 trillion still deployed in basis trades is not trivial. At that scale, the strategy remains a significant source of market liquidity. But in a market where momentum determines how much structural support exists at any given moment, a declining trajectory from a $200 billion peak-to-trough drawdown in trade size is the number that matters.
