The Iran Conflict and Global Markets: What Investors Should Know

On February 28, the U.S. and Israel launched joint strikes on Iran targeting nuclear sites and senior leadership, including Supreme Leader Khamenei – a decapitation strategy aimed at fracturing the regime from within rather than mounting a ground invasion. Analysts expect the conflict to last one to three weeks, with an outer bound of two months, as Iran has lost control of its airspace and faces deep institutional penetration by U.S. and Israeli intelligence.

Iran’s counter-strategy centers on raising costs: disrupting the Strait of Hormuz (through which ~20% of global oil and liquid natural gas (LNG) flows), activating proxies (Hezbollah in Lebanon, the Houthis in Yemen, Shia militias in Iraq), and striking Gulf Cooperation Council (GCC) neighbors to regionalize the conflict. However, this approach may be backfiring – attacks on Gulf civilians risk pulling regional states toward the U.S. side rather than pressuring the U.S. to de-escalate.

The market impact is playing out across four interconnected threads. Oil surged to $82 before settling around $78, with Hormuz tanker traffic near-halted and ~150 ships stranded; Qatar has paused LNG production and Saudi Arabia closed its largest refinery after drone attacks. On inflation, the oil shock is layering onto already-hot price data (core Producer Price Index at 3.6% year-over-year), compounding price pressures that were already running above target. The Federal Reserve (Fed) is effectively frozen: the March Federal Open Market Committee is a lock for hold at 97%+ probability, and the odds of a second rate cut this year have fallen to roughly 50%. Notably, two-year Treasury yields rose 12 basis points on the day – an unusual move during a geopolitical crisis that signals bond markets see inflation keeping the Fed sidelined rather than a growth scare prompting easing. Politically, elevated gas prices directly threaten the affordability message the governing party needs heading into November midterms.

Past geopolitical conflicts offer some perspective on how markets may respond during periods of military escalation. In both prior Gulf Wars, oil prices fell sharply and equities rallied once military operations began. During Desert Storm (1991), oil dropped over 30% and the S&P 500 rose nearly 25% within three months. During the Iraq War (2003), oil fell over 10% while the S&P 500 gained over 20% in the same window. Desert Storm lasted four weeks, and the 2003 Iraq War lasted six weeks. However, the current setup differs in important ways: in both prior conflicts, oil had spiked and equities had sold off in the run-up to war, creating room for a relief rally. That said, U.S. oil production is now roughly double what it was during those conflicts, which caps some of the upside to oil prices from a short-term Middle East supply disruption.

These four elements – oil, inflation, the Fed, and midterm politics – create a self-reinforcing feedback loop that supports the thesis of a short war. High oil prices feed inflation, inflation constrains the Fed from cutting rates, higher rates and energy costs hurt consumers, consumer pain erodes political support, and political pressure pushes the administration toward a quicker resolution. The administration’s plan to guaranty the safety of tanker passage through the Straits of Hormuz has yet to be tested, both in terms of the willingness to trust in the U.S. ability to protect the tankers.  The most likely endgame is a truce, with Iran either agreeing to negotiate on U.S. terms or accepting a grudging status-quo ceasefire. Regime change becomes plausible if the war extends beyond two weeks, with a base case being a military-dominated moderate successor government.

From an asset allocation standpoint, the conflict has not shifted the broader positioning thesis. International equities remain more attractive than U.S. stocks on valuation and fundamentals, and while a short-term flight to safety could support the dollar and create a modest headwind for international markets, it should not be significant enough to shift the relative outlook.

The biggest risk to this entire thesis is miscalculation – a prolonged Hormuz closure, a simultaneous disruption of Bab el-Mandeb choking both Gulf and Red Sea trade routes, or direct strikes on regional energy infrastructure could push Brent past $100. At that point, the inflationary and political damage becomes much harder to contain within a midterm cycle, and the feedback loop that incentivizes a short war begins working against the administration.

Developments in the Middle East highlight how quickly global events can affect financial markets. While uncertainty may create short-term volatility, maintaining diversified portfolios and a disciplined investment process remains an important way to navigate changing conditions and stay focused on long-term objectives.