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Hedge funds play a bigger role in US debt. What drives their demand?
Information as of 22 October 2026. The latest analysis used was published on 16 October. Portfolio holdings refer to end-2025 and the basis-trade estimate to September 2025; these are not October 2026 readings.
Hedge funds have become more important participants in the US Treasury market in recent years. Their purchases often reflect debt-financed arbitrage rather than a conviction that yields must fall.
How large is their involvement?
The Office of Financial Research estimates that hedge funds held USD 2 trillion of cash Treasuries at end-2025 — almost three times the amount five years earlier. Their market share reached a record 7%. This estimates securities held, rather than total exposure including derivatives. Source: OFR, 19 August 2026.
Arbitrage rather than a simple rate bet
One important mechanism is the cash–futures basis trade: a fund buys a Treasury, finances it with a short-term repo loan secured by that security and simultaneously sells the corresponding futures contract. It seeks to profit from relative prices after financing and collateral costs. Thin margins encourage substantial leverage. A Fed study estimates this strategy at approximately USD 830 billion in September 2025, or 35% of the studied funds’ long Treasury exposure. Short futures positions therefore do not automatically indicate a bet on falling bond prices. Source: Fed, 22 June 2026.
Funds respond in part to demand from asset managers who prefer obtaining exposure through futures to buying the bonds themselves. They thus connect cash and futures markets and help align prices. Source: OFR, 19 August 2026.
More liquidity, but also vulnerability to shocks
The benefit is additional demand and liquidity. The risk is dependence on funding: difficulties rolling repo or rising collateral requirements can force rapid position reductions and bond sales. A safe issuer does not make a leveraged strategy safe. Source: Fed, 22 June 2026.
An important update: on 16 October, Dallas Fed reported that after strong growth the basis trade had plateaued and recently contracted slightly. It pointed to the strategy’s reduced relative appeal and the alternative of trading swap spreads against Treasuries. Continuous growth in this part of hedge-fund involvement should therefore not be assumed. Source: Dallas Fed, 16 October 2026.
WMA assessment: hedge funds’ larger role over several years means that US debt-market stability depends not only on who buys bonds, but also on how those purchases are financed.
Posts reflect the author’s personal views as of publication. They are not investment recommendations.