How Geopolitical Risk Affects Stocks: What Three Real Crises Show

When a war breaks out or a shipping lane closes, the first question most investors ask is "is this bad for my stocks?" The honest answer is that it depends on the route the shock takes, and on whether the market has ever priced that kind of event before. This article walks through how geopolitical risk reaches a portfolio, using three real crises that DELAX GEO-RISK (also written GeoRisk) tracks: the 2026 Strait of Hormuz war, a possible Taiwan blockade, and the Red Sea shipping reroute.

What is geopolitical risk, for an investor?

Geopolitical risk is the chance that a conflict, sanction, blockade or political shock changes the prices your investments depend on. For an investor it is not about the headline itself. It is about the routes a shock travels before it reaches a company's earnings:

• Oil: a closed strait or a damaged field raises fuel costs for airlines, chemicals and transport, and lifts oil producers.
• Shipping and freight: rerouted ships take longer and cost more, which feeds into retailers and manufacturers.
• Inflation: higher energy and freight costs push up prices, which moves interest-rate expectations.
• Growth (GDP): a large shock slows the world economy, which weighs on most stocks at once.
• Defense: governments spend more, which reaches defense contractors.
• Food: fertiliser and grain routes can be cut off.
• Currencies: emerging-market currencies tend to weaken when risk rises.

Two portfolios can face the same crisis and have completely different exposure, because they sit on different routes. A book heavy in airlines and a book heavy in oil producers point in opposite directions under the same oil shock.

Lesson 1: the Strait of Hormuz war, a shock the market did price

On 28 February 2026 an air war against Iran began, and Iran closed the Strait of Hormuz. Brent crude ran from $70.9 to $138.2 a barrel at its peak on 7 April. A ceasefire was reached on 8 April 2026. The war reached ceasefire; the crisis has not. Traffic through the strait is still far below normal, and the platform models the current state as an armed truce.

Because this event really happened, we could measure how each sector actually moved, and fit our model to it. The most useful finding was a correction. Our earlier model had been built from the 2022 Ukraine invasion, and it was two to three times too harsh. Oil stress was almost the same in both events (Brent peaked at $133 in 2022 and $138 in 2026), yet sectors moved less than half as much in 2026. Energy producers beat the market by 46.1% after Ukraine, but by 19.4% during the Hormuz war.

What it means for you: a past crisis is a guide, not a template. The same oil price can produce very different stock moves depending on what else is happening (in 2026, the AI cycle and the interest-rate cycle). Any tool that applies one war's numbers to another without saying so is overclaiming.

Lesson 2: Taiwan, a risk the market has never priced

Taiwan has never been blockaded, so there is no real event to measure. We tested five past scare episodes to see whether markets had ever priced this risk. They had not. During the December 2025 Chinese military escalation, the most serious in decades, chipmaker shares rose 20.6% relative to the market. The AI boom did not just drown out the fear. It reversed it.

So the figures for Taiwan are reasoned estimates, anchored to published research: Bloomberg Economics (February 2026) puts a year-long blockade at a 5.0% hit to world GDP, and a war at 9.6%, roughly $10.6 trillion in the first year.

What it means for you: "the market isn't worried" is not the same as "the risk is small". When a risk has never been priced, the exposure in a portfolio can be large even while prices look calm. On DELAX this crisis carries the trust label UNPRICED (an estimate), so you always know the numbers are reasoned, not measured.

Lesson 3: the Red Sea, a shock that happened but shares ignored

From December 2023, after attacks on ships, container lines stopped using the Bab el-Mandeb strait and sailed round the Cape of Good Hope. About 19 container ships a day used the strait before the attacks, and 4 to 7 a day in every month since (IMF PortWatch). Container freight rates, measured from Drewry's weekly index, rose 122.7% over the reroute.

But the shares of the container lines did not follow the route in any way that survives a change of start date or a second company. The real economy moved; the listed shipping stocks did not track it. We also corrected ourselves in public here: a widely reported "return to Suez" in early 2026 never showed up in actual ship traffic, and we withdrew the claim on 3 October 2026.

What it means for you: the most obvious stock is not always where the exposure lands. Freight costs reached retailers and importers in some regions. The shipping shares themselves were a poor guide.

How to measure geopolitical risk in your own portfolio

Three questions work for any crisis:

1. Which routes does this crisis travel? Oil, freight, inflation, growth, defense, food, currencies.
2. Which of my holdings sit on those routes, and in which direction? Some holdings are exposed, some are resilient, some benefit.
3. How sure is the estimate? Was it measured on a real event, or reasoned for one that has never happened?

The DELAX Workspace does this for a portfolio you enter: it scores every holding under each crisis and each scenario, shows which crisis reaches your book hardest, and puts a trust label on every number. You don't need an account to try it.

Is there a geopolitical risk index?

Several exist. Academic indexes count conflict-related words in newspapers. The DELAX Global Strain Index (DGSI) takes a different approach. It combines five measured inputs (oil, consumer prices, food prices, the dollar and conflict attention in the news) into one number that says whether background pressure is tighter than usual. Zero means normal; +2 or beyond is pressure seen only a handful of times in a generation. It updates on a schedule, never by hand. How the DGSI is measured.

What to watch next

• Hormuz: whether daily Brent rises above the armed-truce peak the model uses, and whether traffic through the strait recovers.
• Taiwan: any escalation that finally moves chip stocks down relative to the market. That would be the first sign the market is pricing the risk.
• Red Sea: whether container traffic through Bab el-Mandeb actually returns, measured in ships rather than announcements.

The platform watches these signals and opens a review of its own figures when one of them changes.

The short version to say it all.

Geopolitical risk reaches stocks through specific routes, not through headlines. One measured war, one never-priced risk and one ignored shock all point to the same habit: ask which route a crisis travels, which of your holdings sit on it, and how sure the estimate is.

DELAX GEO-RISK describes exposure. It does not tell anyone what to buy or sell, and nothing here is financial advice. For the full method, including everything we got wrong first, read the methodology.