Global stocks, bonds, and gold face a triple sell-off: "This is the worst situation; investors have nowhere to hide."

The energy shock triggered by the Iran war is pushing global financial markets into a rare, synchronized collapse across multiple asset classes. Stocks, bonds, and gold all fell in March at the same time. Defensive tools in traditional investment portfolios are proving to be nearly entirely ineffective, leaving investors facing the most severe safe-haven dilemma in recent years.

According to the Financial Times, the MSCI Global Index, which tracks stocks in developed and emerging markets, is down about 9% in March. In the U.S., the S&P 500 fell for a fifth straight week, marking its longest losing streak since 2022. The Nasdaq 100 dropped into a correction range over the week.

At the same time, a composite measure of global government bonds and corporate bonds fell by more than 3%. The traditional “60-40” stocks-and-bonds portfolio is on track for its worst single-month performance since September 2022. Gold also slumped this month by 15%. Under liquidity pressure, investors have been forced to close out long positions that had previously delivered substantial gains.

The market’s core fear is the risk of stagflation. After the outbreak of the Middle East war, the sharp surge in energy prices has raised concerns that the global economy could slide into a stagflationary mix of slowing growth and rising inflation. This has forced central banks, which had been planning a rate-cut path, to reconsider the possibility of rate hikes—ultimately dealing a blow to all three major mainstream asset classes: stocks, bonds, and gold.

“Nothing is effective”: Three major assets under simultaneous pressure

What’s rare about this selloff is that stocks, bonds, and gold are all declining at the same time, leaving multi-asset diversification strategies nearly ineffective.

In the stock market, the MSCI Global Index for stocks in developed and emerging markets is already down about 9% in March. In the U.S., the S&P 500 fell for a fifth straight week, setting the longest losing streak since 2022. The Nasdaq 100 slid into a correction range over the week.

In the bond market, the yield on the 10-year U.S. Treasury rose at one point to 4.48%, its highest level since July, while the 30-year yield also neared 5%. European bond yields similarly hit their highest levels since the outbreak of the conflict. The bond selloff is not merely reflecting rising inflation expectations; it more clearly signals the market is repricing the policy paths of the world’s major central banks.

The collapse in gold has surprised the market even more. Gold surged strongly over the past two years, reaching a peak in January this year, but it has already fallen 15% this month. Sophie Huynh, multi-asset portfolio manager at BNP Paribas Asset Management, said that because investors have “nowhere to hide,” they are “monetizing high-yield assets like gold” to meet liquidity needs.

Tikehau Capital’s head of capital markets strategy, Raphaël Thuin, said bluntly: “What works for investors? Nothing does. This really is one of the worst scenarios you can think of. Managing investment portfolios over the past few weeks has been extremely difficult.”

Trump’s comments fail to stop the bleeding, and market trust fractures

Trump extended the final deadline for attacks on Iran’s energy infrastructure, but that statement failed to calm investors’ sentiment. The S&P 500 fell another 1.7% on Friday, extending the decline from the prior trading day (the worst single day since the outbreak of the conflict). Over two days, the cumulative drop was the largest since last year’s tariff turmoil.

Jordan Rochester, head of fixed income strategy at Mizuho, said the extension “did not solve the Houthi crisis at the Strait of Hormuz that has been building up day after day,” adding that the market “may start reducing attention to verbal pressure from the White House, focusing instead on the reality of on-the-ground energy shortages.”

U.S. Secretary of State Marco Rubio predicted the war would end in “weeks, not months,” but the market barely reacted. Larry Weiss, head of equity trading at Instinet, said:

“Weeks ago, news like that would have driven markets sharply higher, but today there’s zero reaction. No one knows what happens next, and there is inherent distrust on both the U.S. government and Iran sides regarding statements.”

Federated Hermes’ deputy chief investment officer for equities, Steve Chiavarone, also noted: “In the past, Trump used his words to steady the oil market and the bond market, and markets had been waiting for the conflict to end. But today, the market is no longer responding to that.”

Defensive tools fail, and the case for diversification faces a challenge

This crisis is not only a market pullback; it is also a deep interrogation of the multi-asset diversification investment framework from the past several decades.

Michael Purves, founder of Tallbacken Capital Advisors, explained in a report to clients: “An investor who had perfect foresight on February 27 (the day before the outbreak of the conflict), and who bought bonds, gold, VIX call options, and S&P 500 protective options in advance, is now in a loss position across nearly all holdings.”

Research by Bloomberg Intelligence ETF analyst Athanasios Psarofagis shows that this year, on trading days when stocks fell, the probability that bonds and gold rose at the same time was only about 43%. The probability for bitcoin was even lower, at around 25%—far below the level of more than 60% seen a decade ago.

Christian Mueller-Glissmann, head of asset allocation strategy at Goldman Sachs, said that in the early stage of the inflation shock, “the only tool that can work” is derivatives that bet on rising inflation or rising commodity prices. After the conflict broke out, the team shifted to over-allocating to cash.

The latest Bank of America survey of fund managers shows that in March, investors moved into cash at the fastest pace since the COVID-19 pandemic.

Even though the current situation is grim, some market participants believe the persistence of this pattern depends on how the conflict unfolds.

Michael Arone, chief investment strategist at State Street Investment Management, said the failure of the diversification function of fixed income may be temporary. His team has recently reduced equity exposure, increased bond holdings, and expects that once tensions between the U.S. and Iran start to ease and inflation risks subside, the bond market will return to a rate-cut logic.

However, Schroders’ Mina Krishnan warned that the market environment has undergone a deeper structural shift: “The world has moved from a demand-side shock to a supply-side shock, and the old investment script needs to be rewritten.” Her team had already bought protection via credit default swaps before the outbreak of the Middle East conflict and has continued to hold them.

Raphaël Thuin at Tikehau Capital goes directly to the core contradiction: “The traditional concept of safe-haven assets is increasingly being challenged. The evolving dynamics of the global economy and financial markets have made this narrative more complicated.”