A burst of volatility in European rates markets, unleashed by war in the Middle East, is reviving a discussion about the role hedge funds play in amplifying the swings.
By some measures, Monday saw some of the choppiest trading since the early days of the pandemic. A key euro interest-rate swap curve inverted, only for the move to reverse within hours. At one point, traders were pricing two European Central Bank hikes this year, while wagers on Bank of England policy flipped from cuts to hikes and back again.
At their root, the moves were triggered by the economic shock of soaring energy prices that forced a broad unwinding of popular investment strategies. While hedge funds aren’t the sole drivers of the volatility, brokers and fund managers interviewed by Bloomberg suggested that their reliance on borrowed cash to boost returns, as well as aggressive exit strategies during times of stress, had magnified the ructions seen this week.
"The expansion of the speculative community over the last few years could have contributed to pockets of concentrated risk,” said Tom Prickett, head of G10 rates trading for EMEA at Citigroup Inc. "Liquidation of positioning has definitely played a part — both in the outright move in front-end rates and the increase in volatility levels.”
Hedge funds are now behind more than half of electronic European government bond trading volumes on Tradeweb, according to analysis by the ECB last year — compared with about a quarter in 2018. Jefferies research estimating the activity of hedge funds show that positions in UK front-end rates are now flat, having been one of the most crowded trades before the Iran war. There was a similar rapid adjustment in European rates, Jefferies said.
While the swings ultimately didn’t pose a systemic risk, they were a reminder of how quickly markets can destabilise. Regulators are increasingly concerned about the growing role of leveraged hedge funds: A welcome source of liquidity in good times, the worry is they fuel financial instability by derisking in union when markets come under stress.
"The structure of modern hedge fund activity matters,” said Fraser Lundie, global head of fixed income at Aviva Investors. "Multi manager platforms run tightly risk controlled strategies with similar horizons, similar stop loss frameworks and similar reliance on short term funding.”
When volatility increases or the cost of funding jumps, "positions that appear diversified at the portfolio level can behave in a highly correlated way once risk limits are hit. That can amplify short term moves,” Lundie said.
Jillien Flores, chief advocacy officer at the Managed Funds Association, defended the role hedge funds play.
"Hedge funds foster deeper, more efficient sovereign debt markets that keep government borrowing costs low,” she said. "Policymakers should continue strengthening market infrastructure, including by encouraging central clearing, to ensure these markets remain resilient and attractive to global investors.”
In the run up to the war, volatility had been subdued, which can encourage investors to juice their returns by betting with borrowed money. Investors piled into bets on the differences between European short- and long-terms rates, according to a report last month by the Financial Stability Board. Wagers on duration, or how much bond prices move when interest rates change, were also popular.
But when the US-Israeli attack on Iran propelled oil prices past $100 a barrel, inflation fears spiraled. Traders were forced to think about central bank hikes — rather than cuts — and many of their trades suddenly looked like a bad idea.
Large hedge fund stop-outs — particular levels where a trade has to be unwound to curtail losses — hastened the sprint for the exits, according to RBC BlueBay.
"We see, especially in the hedge fund space, large capitulation trades,” said Kaspar Hense, a portfolio manager at RBC BlueBay. "It looks nasty for sure. We see a lot of stop-loss taking which indicates the market is not pricing in fundamentals any longer but has overshot in the rates space.”
Targeting a larger gap between 10- and 30-year rates on the European interest-rate swap curve was a consensus trade for much of the last year. On Monday, it suddenly inverted for the first time since May as hedge funds were stopped out of popular steepener positions — only for the move to entirely reverse later in the session.
There was similar upheaval in front-end euro area rates, with traders at one point fully pricing in two ECB hikes. The market-implied rates path appeared to move in lockstep with the moves in energy prices — even as many investors and economists remain skeptical ECB officials will be keen to hike amid an energy shock as it could derail economic growth.
Meanwhile, UK swap markets went from pricing no monetary tightening from the BoE in 2026 to almost a quarter percentage point of hikes, then flipped back again before Monday’s session was out. It marked a complete change of outlook: Before the war, traders were rushing to bet on two quarter-point cuts, with the first expected at next week’s meeting.
"We saw significant liquidation, with heavy flow in the some of the most crowded trades,” said Julian Baker, co-head of EMEA linear rates trading at JPMorgan. "Longs in front-end rates and 10/30 steepeners in both nominal and options formats were pared back meaningfully.”
To be sure, it’s not the first time in recent years that euro and sterling rates markets have gone from sedate to unruly.
The inflationary spiral that started in 2021 brought a surge in volatility. Traders accustomed to near- or sub-zero rates suddenly had to overhaul their portfolios. Russia’s invasion of Ukraine in 2022, former UK Prime Minister Liz Truss’s calamitous mini-budget, as well as various bank collapses also tested the market.
And while some of the world’s biggest hedge funds suffered millions of dollars of losses, there were no signs of broader risk to the financial system. Evidence of the mass deleveraging seen in bond futures and interest-rate swaps markets wasn’t apparent in the repo market — a key source of leverage — which remained orderly, according to traders familiar with the matter, who aren’t authorised to speak publicly.
Regardless of the impact from hedge funds’ activities, the violent moves show how easily price action can become unmoored when traders try to model the economic uncertainty of an energy-price shock, and central bankers’ potential response.
Mohit Kumar, chief economist and strategist for Europe at Jefferies International Limited, says the repricing has overshot and is advising clients to bet against the rise in UK and European swap rates.
"The rates repricing has been asymmetric and driven more by positioning rather than fundamentals.”