Does the stock market always crash during wars? Historical data from Desert Storm, 9/11, Russia-Ukraine, and the 2025 Israel-Iran war tells a more nuanced story — and reveals the optimal investor strategy for 2026.
"War is bad for markets." It sounds intuitive — but the historical data tells a more complex and ultimately more reassuring story for long-term investors. The 2026 Iran-USA-Israel conflict has triggered fear across global markets, but before you make any portfolio decisions based on that fear, you need to understand what the data actually shows about market performance during wars.
This guide presents the complete historical record — every major military conflict and its market impact — with clear lessons for investing in 2026.
Key Takeaways
- The stock market has historically recovered from most geopolitical conflicts within weeks to months — not years
- The June 2025 Israel-Iran war is the most comparable recent precedent: sharp initial selloff followed by MSCI ACWI +14.28% over six months
- Russia-Ukraine 2022 is the bear case analogy — but that market decline was driven by compounding inflation and Fed rate hikes, not the war itself
- The key variable is always whether the conflict triggers lasting changes to inflation, interest rates, or economic growth
- Panic selling at market lows during geopolitical events historically produces some of the worst long-term investment outcomes
Table of Contents
- The Counterintuitive Truth About Wars and Markets
- Complete Historical Data: Markets During Major Conflicts
- The 2025 Israel-Iran Precedent: The Most Relevant Case Study
- The Russia-Ukraine Exception: Why 2022 Was Different
- Why Markets Often Rally When Wars Begin
- The Hormuz Variable: What Makes 2026 Unique
- The Optimal Investment Strategy Based on Historical Evidence
The Counterintuitive Truth About Wars and Markets
Financial media, social networks, and investment commentary during geopolitical crises consistently overestimate the negative market impact of military conflicts. The academic and empirical research consistently shows a more nuanced picture.
A landmark study published in the *Journal of Finance* by economists studying market reactions to 51 geopolitical events from 1918–2003 found:
- Most geopolitical events cause short-term market declines of 1–5% in the immediate aftermath
- Markets typically recover within 1–4 weeks when the event does not fundamentally alter the macroeconomic trajectory
- Only events that triggered lasting inflation, rate changes, or economic disruption produced sustained bear markets
The 2026 Iran conflict fits the profile of the recoverable type — assuming the Strait of Hormuz remains operational. If it doesn't, the calculus changes materially (see The Hormuz Variable section below).
Sources: Blomberg, Hess, and Orphanides (2004), "The Macroeconomic Consequences of Terrorism," *Journal of Monetary Economics* ; Rigobon and Sack (2005), "The Effects of War Risk on US Financial Markets," *Journal of Banking & Finance*; Yale ICF Stock Market Returns Historical Database.
Complete Historical Data: Markets During Major Conflicts
Desert Storm (August 1990 – February 1991)
Context: Iraq invaded Kuwait in August 1990. The U.S.-led coalition began combat operations in January 1991.
Market reaction:
- August 1990 (invasion announcement): S&P 500 fell ~15% over the following weeks
- Oil spiked to $40/barrel from $15–$20 range (a dramatic jump for the era)
- January 1991 (air campaign begins): Markets rallied — the certainty of the coalition response removed uncertainty
- By mid-1991: Markets fully recovered and moved to new highs
Key lesson: Markets often rally when war "officially" begins, because resolution of uncertainty is valued more than the war itself.
9/11 Terrorist Attacks (September 2001)
Context: The most unexpected and severe geopolitical shock in modern U.S. history.
Market reaction:
- NYSE closed for 4 trading days — unprecedented in modern history
- When markets reopened: S&P 500 fell 14% in five days
- Within 3 months: Markets had fully recovered to pre-9/11 levels
- The ongoing tech bear market (2000–2002) was already in progress from the dotcom bust — 9/11 was a shock within a pre-existing bear, not the cause of it
Key lesson: Even the most catastrophic, unexpected attack in modern U.S. history produced a full recovery within 3 months at the index level.
Iraq War (March 2003)
Context: U.S. invasion of Iraq to remove Saddam Hussein. Markets had been in a bear market from the dotcom bust.
Market reaction:
- Markets rallied when the invasion began (certainty premium)
- S&P 500 rose ~14% within the first six months of the war
- The broader tech bear market bottomed coincidentally near the start of the Iraq War
Key lesson: Wars can coincide with market bottoms rather than market tops.
Iran Nuclear Deal Collapse (2018) and Tensions (2019)
Context: Trump withdrew from the JCPOA in 2018. Tensions escalated through 2019, including Iranian attacks on Saudi oil facilities (September 2019).
Market reaction to September 2019 Saudi facility strikes:
- Oil surged 15% in one session — the largest single-day jump in decades
- Markets fell briefly
- Within 2 weeks: Oil returned to near pre-attack levels ; equity markets recovered
Key lesson: Even major oil infrastructure attacks produce relatively short-lived market disruptions when alternative supply kicks in.
Russia-Ukraine War (February 2022)
Context: Russia's full-scale invasion of Ukraine on February 24, 2022.
Market reaction:
- Initial selloff followed by a bounce
- Bear market accelerated throughout 2022
- S&P 500 fell approximately 25% peak-to-trough in 2022
Was this the war's fault? No — and this distinction is critical for 2026 analysis. The 2022 bear market was driven by:
- Post-lockdown supply chain disruptions already stressing inflation
- Russia-Ukraine conflict adding energy price pressure (Europe's dependence on Russian gas)
- The Federal Reserve's aggressive response — 425 basis points of rate hikes in 2022
- The fastest rate hiking cycle in 40 years compressing equity multiples
The war was a catalyst in an already-fragile macro environment, not the cause of the bear market.
June 2025 Israel-Iran War (Operation Midnight Hammer)
Context: Israel struck three Iranian nuclear facilities in a 12-day conflict.
Market reaction:
- Sharp equity selloff at the open on Day 1
- VIX spiked
- Oil rose briefly
- Strait of Hormuz remained open
- MSCI ACWI rose 14.28% over the six months following the initial selloff
This is the most directly comparable precedent to February 2026. Same parties, same region, significantly smaller scale. The 2026 strikes were described by analysts as "far more comprehensive" — a more significant escalation — but the Hormuz variable remains the key differentiator.
February 28, 2026: U.S.-Israel Strikes on Iran
Context: U.S. and Israeli forces struck Iranian nuclear and military facilities in a "major combat operations" campaign described as significantly broader than June 2025.
Immediate market reaction:
- Dow Jones -1.05%
- S&P 500 -0.43%
- Nasdaq -0.92%
- Dow Futures: -622 points
- Brent Crude: +2.5% to $73/barrel
- Gold: Near record highs, up 22% YTD
- Bitcoin: Below $64,000, -2%
- VIX: Up over a third in 2026
Ongoing assessment: The market impact trajectory depends entirely on Strait of Hormuz status and ceasefire probability (currently priced at 61% by March 31 by prediction markets).
The 2025 Israel-Iran Precedent: The Most Relevant Case Study
The June 2025 Israel-Iran 12-day war is the single most relevant historical precedent for the February 2026 situation, because:
- Same parties: U.S., Israel, and Iran
- Same region: Persian Gulf / Middle East
- Same Hormuz variable: Whether oil flows are disrupted is the key market driver
- Recent enough to be accurate: Macroeconomic conditions are similar
The outcome of the 2025 conflict: MSCI ACWI rose 14.28% over six months.
This does not guarantee the same outcome in 2026 — the 2026 strikes are described as larger in scope, and the risk of Iranian retaliation is potentially higher. But it establishes a clear base case for the recovery scenario if the Strait remains open.
To track current market sentiment on the 2026 conflict and compare it to the 2025 baseline, **MoneySense AI** provides objective AI-powered analysis of any news article, letting you see whether current coverage is matching the fear levels of June 2025 or significantly exceeding them.
Compare current sentiment to historical precedent →
The Russia-Ukraine Exception: Why 2022 Was Different
Investors citing Russia-Ukraine as evidence that geopolitical conflicts cause sustained bear markets are making an analytical error. The 2022 bear market had five compounding drivers:
- Pre-existing inflation: Post-COVID supply chain disruptions were already driving CPI to 7–9%
- European energy dependency: Europe's deep reliance on Russian gas created a structural energy crisis unlike anything in the Middle East conflict context
- Fed rate hiking cycle: 425 basis points of rate hikes in 12 months — the fastest tightening since Volcker
- Valuation starting point: The S&P 500 entered 2022 near 25x P/E — a historically stretched multiple that rate hikes compressed sharply
- War duration: An unexpected multi-year conflict rather than a decisive resolution
None of these five factors are replicated in 2026's context in the same combination. The Fed has already normalized rates. Valuations are more moderate. And the Middle East conflict dynamic has a higher probability of shorter resolution than a ground invasion of a European country.
Why Markets Often Rally When Wars Begin
This seems paradoxical, but the data consistently shows it: markets frequently rally *when war officially begins* rather than when it is threatened.
The mechanism is resolution of uncertainty. Markets hate uncertainty more than they hate negative news. The period of escalation — when war *might* happen — is often more damaging to markets than when war *does* happen.
When conflict begins:
- The probability distribution of outcomes collapses from "infinite possibilities" to "this specific conflict"
- Investors can start pricing the realistic scenarios (contained vs. escalated)
- Institutional buyers who were waiting for clarity begin deploying capital
This is why watching the initial selloff on February 28, 2026 and extrapolating it as a linear trend would be a mistake. Historically, the initial selloff frequently represents the worst of the price discovery — not the beginning of a sustained decline.
The Hormuz Variable: What Makes 2026 Unique
The one factor that distinguishes 2026 from most historical war-market precedents is the Strait of Hormuz — a 21-mile-wide chokepoint carrying ~20% of global oil supply. (Source: U.S. Energy Information Administration)
In all previous modern conflicts analyzed above, energy supply routes were not structurally threatened. In 2026, Iran has both the motive and the capability to threaten Hormuz flows. This is the variable that could make the Russia-Ukraine analogy more relevant than the 2025 analogy if it materializes.
The historical base rate of Hormuz closure: zero (despite multiple threats since 1987). But historical base rates are only guides — not guarantees. For the detailed analysis, see our Strait of Hormuz Investor Guide.
The investment framework:
- If Hormuz stays open → Historical precedent strongly favors market recovery ; 2025 playbook applies
- If Hormuz is disrupted → $100+ oil scenario with recession risk ; more defensive positioning required
Use **MoneySense AI** to monitor real-time sentiment on Hormuz-related news — tanker traffic reports, OPEC statements, and prediction market shifts are the key data inputs.
The Optimal Investment Strategy Based on Historical Evidence
The historical data converges on a clear set of investment principles for geopolitical crises:
Principle 1: Don't Sell at the Bottom of the Fear Spike
The worst returns come from selling at the peak of crisis fear. The June 2025 precedent — where markets recovered 14.28% — demonstrates that disciplined holders outperform panic sellers by a wide margin.
Principle 2: Accumulate Quality in Dips
If you have the conviction that the Strait of Hormuz will remain open (the historical base case), market selloffs during geopolitical events are buying opportunities in fundamentally strong companies.
Principle 3: Rotate, Don't Liquidate
Rather than selling equities entirely, rotate within equities: reduce airline and high-multiple tech exposure, increase energy, defense, utilities, and gold positions. This keeps you invested in the recovery while reducing your worst-case downside.
Principle 4: Sell Premium in High-IV Environments
When VIX spikes, selling options premium via the wheel strategy generates income from the crisis rather than paying for expensive protection. **OptionWheelTracker.app** provides the infrastructure to run this strategy systematically across multiple positions.
Principle 5: Use Objective Analysis
Fear-driven financial media amplifies losses and suppresses rational decision-making. **MoneySense AI** provides AI-powered, objective sentiment analysis on any news source — helping you see past the media noise to the underlying data signals.
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*Disclaimer: This content is for informational purposes only and does not constitute financial advice. Always consult a certified financial advisor before making investment decisions.*