Nobody saw February ending the way it did.
For most of early 2026, global financial markets were humming along with the usual concerns. Investors were debating artificial intelligence spending. A few traders were keeping half an eye on US-EU tensions over Greenland. Oil was sitting comfortably between $60 and $70 a barrel. Then, at the end of February, the United States and Israel launched large-scale airstrikes on Iran, and everything changed almost overnight.
What followed was one of the most disorienting stretches of market volatility in recent memory. Oil surged past $120 a barrel. The S&P 500 had its worst quarterly performance since 2022. Bond markets seized up. Gold, which had been on a record run throughout 2025, plunged sharply. And hedge funds, many of which had just posted their best annual gains in 16 years, watched months of carefully constructed positions unravel in days.
This article breaks down exactly what happened, why it hit so hard, and what it means for traders and investors trying to make sense of markets that have become genuinely difficult to read.
What Happened: The Iran War Shock Explained
Late February 2026 brought a dramatic turning point. The US and Israel carried out widespread airstrikes on Iran, killing Iran's supreme leader Ayatollah Ali Khamenei and setting off a new wave of retaliatory missile strikes. The strikes sent global markets reeling, with stocks, bonds, and commodities swinging violently after every White House update.
The immediate economic consequence was what analysts quickly began calling the largest oil supply disruption in modern history. The closure of the Strait of Hormuz on March 4 stranded oil and LNG exports, causing Brent crude to surge past $120 a barrel and forcing QatarEnergy to declare force majeure on all exports. The International Energy Agency characterized it as the largest supply disruption in the history of the global oil market, with echoes of the 1970s energy crisis rippling through inflation data, currency markets, and recession forecasts.
As February came to a close, drivers across much of the US were paying under $3 for a gallon of gasoline. Within weeks, the nationwide average had topped $4 for the first time since 2022. Diesel jumped even more sharply, climbing from roughly $3.76 a gallon before the war to $5.45. For ordinary households, the war was not an abstraction. It showed up at the pump every single day.
How Hedge Funds Got Caught Off Guard
The hedge fund industry came into 2026 riding extraordinary momentum. Hedge funds had landed their biggest annual gain in 16 years in 2025, with equity strategies and thematic macroeconomic funds leading the charge. Confidence was high. Positions were large. And then the war hit.
Global hedge funds faced their worst monthly drawdowns in more than four years in March 2026, according to several top Wall Street prime brokerages. Funds responded to the volatility by pulling back, selling global equities for a fourth straight month and at the fastest pace in 13 years, according to Goldman Sachs research. The S&P 500 slid 4.63% during the quarter while the Nasdaq 100 declined 4.87%.
What made this particularly painful was not just the size of the losses. It was how quickly they arrived and how few defenses worked. The selloff marked a rare moment when traditional diversification within the hedge fund universe offered little protection. Strategies that normally move in different directions all moved the same way at the same time, and downward.
The Names That Got Hit Hardest
The losses were not abstract industry statistics. They landed on some of the most well-known and well-resourced funds in the world.
Tech-focused Coatue fell 3.8% during the week after the strikes, leaving it down 2.4% for the year through early March. Citadel's flagship Wellington strategy declined about 2%, with losses partly driven by its macro trading unit. ExodusPoint Capital Management surrendered its entire year-to-date gains during the same week, while Millennium Management is estimated to have lost roughly $1.5 billion, leaving it up just about 0.75% for the year.
Tiger Global Management's main hedge fund tumbled 7.3% in March alone. Brevan Howard's Master and Alpha Strategies funds were down 2.4% and 1.7% respectively through the first week of March. Diego Megia's Taula Capital, managing $7 billion, was down more than 3%. PIMCO's Commodity Alpha Fund was down more than 20% to start the year after significant losses in March.
Balyasny cut a pair of senior energy portfolio managers and lost 3.5% through the first week of March. For an industry built on the premise of sophisticated risk management, the losses were a humbling reminder that no model fully accounts for geopolitical shock.
Why Bond and Currency Markets Took the Hardest Hits
Most people assume that when geopolitical conflict strikes, stocks fall and everything else holds together reasonably well. What happened in March 2026 was considerably more complicated and in some ways more alarming.
The war in Iran sparked chaos across financial markets, leaving some investors and market makers reluctant to take on risk at all, making trading harder and more costly across asset classes. In the gold market, which is highly sensitive to interest rates, there were days when market makers were absent altogether, indicating a complete unwillingness to transact.
The bond market dysfunction was particularly striking. Hedge funds now make up over 50% of trading volumes in Britain's and Eurozone government bond markets. While their presence provides liquidity in good times, many had piled into the same trades, and those trades quickly proved loss-making. Hedge funds took steep losses betting the Bank of England would cut rates. They also took hits on trades that bet on steeper European yield curves and on trades assuming the gap between Italian and German bond yields would stay narrow.
When everyone tries to exit the same trade at the same moment, the result is a liquidity crisis. As hedge funds all de-risked at the same time, it pushed bond dealers to widen bid-ask spreads significantly, exacerbating volatility further. The very mechanism designed to manage risk became the source of amplified losses.
Oil's Role: The Engine of the Entire Disruption
To understand why markets became so unpredictable, you have to understand what oil does to everything else. It is not simply a commodity. It is an input cost embedded in nearly every product and service in the global economy, a driver of inflation expectations, and a signal that central banks watch constantly when setting interest rate policy.
The key economic risk from the Iran war was always its duration. Sustained higher oil prices could broaden into other costs and raise the odds of higher rates for longer, while weighing on economic activity across the board.
The conflict echoed the 1970s energy crisis through acute supply shortages, currency volatility, inflation and heightened risks of stagflation and recession. Interest rate reductions that had been expected were suddenly postponed or even reversed, given higher inflation caused by supply shortages and speculation.
For traders, this created a scenario with no clean narrative. Were central banks going to cut rates to support a slowing economy? Or raise them to fight oil-driven inflation? The honest answer was that nobody knew, and uncertainty of that kind is the most dangerous environment of all for leveraged positions.
The Few Who Navigated It Well
In a market dominated by losses, the exceptions are worth studying closely because they reveal something important about what actually worked.
Legendary commodities investor Pierre Andurand was up 6% to start March, one of the standout performers of the chaos. D.E. Shaw's macro-oriented Oculus fund was up 2.2% during the worst week for most of its peers.
In Asia, most funds managed out of the region were in the red in March, but they held up better than global peers, having stayed out of the worst-hit wagers on European rates. With the ceasefire, Asian stock-picking hedge funds tracked by Goldman Sachs rebounded 8.9% through April 9, erasing much of the March fall and delivering on average a 15% return for the year.
The common thread among those who avoided the worst losses was straightforward in hindsight, though extremely difficult in practice. They either positioned specifically for the commodity shock, like Andurand, or they simply were not exposed to the European rates trades and crowded multi-strategy positions that became the epicenter of the destruction.
What This Means for Regular Investors and Traders
The Iran war shock of 2026 carries several lessons that extend well beyond hedge funds and institutional trading desks.
The first lesson is about concentration risk. When too many sophisticated market participants hold the same positions, those positions become fragile in ways that pure risk models cannot capture. Global markets went through an "awfully painful pattern where risk-on and risk-off trades turned very wrong within hours as news of war escalation or ceasefire negotiations changed constantly," as one fund described it to investors. No individual trader, retail or institutional, can time these reversals. The only real protection is not being overexposed to any single thesis.
The second lesson concerns the real-world cost of geopolitical events on consumer finances. Americans were spending hundreds of millions of dollars more on gasoline every day after the war began. The S&P 500 had its worst quarterly performance since 2022. This is not just a statistic. For anyone holding a retirement account, a brokerage account, or any investment tied to market performance, a single geopolitical event rewrote the outlook within weeks.
The third lesson is about the limits of safe-haven assumptions. Gold, long considered the ultimate refuge during conflict, did not behave as expected. The price of normally safe-haven gold plunged after a record rally in 2025, a move that surprised even seasoned market participants. In an environment of extreme uncertainty, correlations break down and assets that normally move independently move together.
The Broader Economic Picture Heading Forward
Rising defense outlays could widen deficits and push long-term Treasury yields higher, raising borrowing costs and weighing on rate-sensitive markets. In a 2026 midterm election year, pump prices have become a central voter concern, with supply-boosting proposals from the White House likely to have only limited impact given US rig counts are significantly down from previous years.
Much now depends on how long the conflict and the oil disruption lasts. If tensions ease and shipping routes normalize, markets could stabilize and losses may prove temporary. But if the situation drags on, higher energy prices could start to weigh more heavily on the global economy, hurting consumers, slowing growth, and keeping markets under pressure.
For traders specifically, the uncertainty is likely to persist in one form or another. If geopolitical risks continue, it is likely that redemptions could pick up as some investors seek safety, which would put further pressure on fund managers to reduce risk and potentially create additional volatility across asset classes.
Conclusion: The Market Is Reminding Everyone It Cannot Be Tamed
What happened to global markets in the weeks following the Iran strikes was a forceful reminder of something investors always know intellectually but periodically forget in practice. The market does not care about your models. It does not care about your track record. It does not care how good your year was going up until the moment everything changed.
The funds that got hit hardest were not run by careless people. They were run by some of the most sophisticated investors in the world, with access to information and technology that most traders could only dream of. And they still lost billions in a matter of days because the world changed in a way their models did not anticipate.
For anyone trading or investing in this environment, the appropriate response is not panic and it is not paralysis. It is humility. Smaller positions. Wider diversification. Less leverage. More respect for the possibility that something you did not expect will happen.
The market will always find new ways to be unpredictable. The traders who survive the long run are the ones who accept that reality and build it into everything they do.
Frequently Asked Questions (FAQ)
Q1. Which hedge funds suffered the biggest losses from the Iran war?
Among the hardest hit were Tiger Global, which fell 7.3% in March alone, Coatue Management, which dropped 3.8% in a single week, and Balyasny, which lost 3.5% through early March. Millennium Management lost an estimated $1.5 billion in one week, though it remained marginally positive for the year.
Q2. Why did oil prices rise so sharply after the Iran conflict began?
Iran's geographic position gives it significant control over the Strait of Hormuz, through which roughly 20% of the world's oil supply passes. The closure of this strait in early March 2026 created the largest oil supply disruption in recorded history, sending Brent crude above $120 a barrel.
Q3. Did any hedge funds actually profit from the Iran war chaos?
Yes. Commodities trader Pierre Andurand gained 6% during the most turbulent weeks of March 2026, having positioned for a commodity shock. D.E. Shaw's Oculus fund also posted positive returns. Funds that either avoided crowded European rates trades or specifically positioned for energy market disruption generally fared better.
Q4. How did the Iran war affect everyday investors and retirement accounts
The S&P 500 fell 4.63% in the first quarter of 2026, its worst quarterly performance since 2022. For anyone with a retirement account or stock portfolio, that represented a meaningful reduction in paper value. Higher gasoline and diesel prices also reduced household purchasing power significantly.
Q5. What should traders do differently to protect themselves from geopolitical shocks
The most important steps are reducing leverage, avoiding overcrowded trades, maintaining wider portfolio diversification, and not concentrating too heavily in any single thesis. No model can reliably predict geopolitical events, so the best protection is ensuring that no single unexpected event can cause catastrophic damage to your portfolio.