How Geopolitical Risk Moves Stock Markets: A Trader's Guide to Volatility

Oil had a messy session on 26 October. Brent crude dropped by more than $2 a barrel earlier in the day after talks opened in Tehran, and traders hoped the Middle East conflict might ease. Then the attacks on Saudi Arabia carried on. Oil closed lower but stayed close to its six-month high. The next day it slid another $1.93 to settle at $113.88.

That is geopolitical risk in practice. A strike, a sanctions package or a closed shipping lane shifts what traders expect for oil, inflation, interest rates, and company profits. Prices move before anyone knows the full story.

Getting from a headline to a share price takes more steps than you might think, and the route isn't always the one you'd expect. Take the week to 23 October. Conflict dominated the news, yet gold slipped to a three-month low.

This guide follows that chain step by step, using the Middle East conflict as the worked example.

What geopolitical risk is and how it is measured

Geopolitical risk is the threat that wars, terrorism or tensions between states will disrupt economies and markets.

Economists Dario Caldara and Matteo Iacoviello built the Geopolitical Risk index, which counts how much newspaper coverage focuses on geopolitical tension. It spikes around events such as the Cuban Missile Crisis and the 11 September attacks.

Traders tend to watch prices instead. The Cboe Volatility Index (VIX) shows the expected 30-day volatility of the S&P 500. Cboe also publishes an oil volatility index, the OVX.

Volatility says nothing about direction. It measures how far and how fast prices move, whether up or down.

How geopolitical risk reaches stock markets

Conflict rarely hits shares directly. It usually works through four channels.

• Energy and commodity prices - Conflict near supply routes can hold up oil and gas deliveries. Fuel then costs more to buy. Companies feel that in their running costs, and households feel it on the bill.
• Inflation and interest rates - If energy gets pricier, inflation can follow it up. Central banks have to weigh that when they set interest rates, and share valuations move with their decisions.
• Risk appetite - Government bonds, the US dollar and gold tend to pick up buyers when uncertainty rises, as investors cut their exposure to shares.
• Sectors and regions - The impact isn't even. Energy producers and refiners can come out ahead. At the same time, transport and import-heavy businesses face higher costs. Between countries, energy importers take more strain than exporters.

What the Middle East conflict shows

The US-Israeli war with Iran began on 28 February, 2026, and it gives us a live example. Reuters reports that October has been the worst month for attacks on commercial shipping around the Strait of Hormuz, based on data from the Washington Institute for Near East Policy.

The market reaction shows several of the channels at work:

• Oil swings on headlines - Brent crude fell by more than $2 at one point on 26 October on hopes of talks in Tehran. It still closed lower but stayed near six-month highs, with attacks on Saudi Arabia continuing. A day later, on 27 October, Brent settled at $113.88 after a $1.93 fall.
• Oil volatility outruns equity volatility - Cboe's oil volatility index stood at 59% in mid-September. The VIX stood at 15.8%.
• Sectors diverge - BlackRock's weekly market commentary of 26 October has refiner shares up about 160% this year and tanker operators up about 120%. Major oil and gas producers are up about 40%. Over the week to 23 October, the Nasdaq fell nearly 1% and the S&P 500 fell less than 1%.
• Regions diverge - The same report puts the energy shock's hit to economic output at about 0.5% in Europe and 0.1% in the US. European gas storage sits at its lowest for the time of year since records began in 2011.
• Oil feeds into inflation - Higher fuel costs are starting to feed into some core inflation categories, the report says. That follows a hotter-than-expected US inflation report for September.

Why safe havens do not always hold

The textbook says investors buy government bonds, the dollar and gold when fear rises. That same week showed the pattern isn't fixed.

US Treasuries rallied as investors sold technology shares, and the 10-year yield slipped below 5%. Gold didn't follow. A commodities market note published on 23 October said gold came under pressure as traders focused on what higher oil prices mean for inflation and interest rates. It traded near a three-month low around $4,000 an ounce.

Currencies react unevenly too, depending on a country's energy and trade exposure. ThinkMarkets covers this in their guide on how geopolitical events affect forex markets.

How traders prepare for volatile markets

Nobody can time a headline, and the first move can reverse within hours. Preparing for volatility is usually more useful than trying to predict it.

These risk management techniques are common:

• Size positions for the conditions - Bigger swings mean a position can win or lose more in less time. Some traders cut size when volatility picks up.
• Know what stop orders cannot do - A price can jump straight past your stop level, particularly on overnight or weekend headlines. You may then be filled at a worse price than you expected.
• Watch spreads and liquidity - Around major events, spreads can widen and volume can spike, so trading costs rise.
• Respect leverage - Gains and losses both get magnified. In a fast market, a small price move can hit an account hard.
• Plan around scheduled events - Central bank decisions, inflation data and elections all appear on an economic calendar in advance. The US midterm elections on 3 November are one example.
• Separate the headline from the price - Check that prices actually back up the story. On 26 October, a single day carried hope of talks and fresh attacks at the same time.

None of these techniques removes the risk of loss. Fast markets can move against a position within minutes, and leveraged products can lose money rapidly.

Read the headline, then read the price

Geopolitical risk doesn't move every market the same way. Oil, rates, currencies and shares each respond to a different part of the story. On the same day, they can head in different directions.

Before the next headline lands, work out how the channels apply to you. Ask what it means for energy, inflation and policy. Then ask how your own exposure would respond.

Conditions in the Middle East can change quickly, and the figures above will not stay current. All market information is correct as at 28 October, 2026.