As of April 20, 2026, global financial markets entered the new week in a state of both tension and caution. Oil prices surged, the U.S. dollar rebounded from recent lows, U.S. Treasury yields edged higher, and global equities traded in mixed territory. The real focal point was no longer just diplomatic rhetoric, but one very concrete variable: whether shipping traffic through the Strait of Hormuz would continue.

How Did Markets React?

The first trading session of the week showed a moderate but clear risk-off reaction. Reuters reported that Brent crude rose as much as 6% to around $96 per barrel during Asian trading, while WTI climbed to roughly $90.38 per barrel. At the same time, S&P 500 futures fell about 0.7%, Australia’s ASX 200 dropped 0.5%, while Japan’s Nikkei rose 0.7%. The euro slipped around 0.1% to $1.1735, the yen weakened to around 159 per dollar, and the yield on the 10-year U.S. Treasury note rebounded to 4.276% after falling sharply in the previous session.

What stands out is that the equity sell-off remained relatively contained. This is an important detail. If markets truly believed the conflict was entering a more dangerous and uncontrollable phase, the reaction in equities could have been far more severe. Instead, investors still appear to be leaving room for the possibility that the current escalation is only a short-term setback before both sides return to negotiations. Reuters quoted strategist Damien Boey as saying that while the headlines look troubling, markets still believe both sides ultimately have an incentive to reach some form of agreement.

Why Did Oil Prices Rebound So Sharply?

The answer lies in how quickly market expectations reversed. Just days earlier, markets had breathed a sigh of relief when Iran announced that the Strait of Hormuz had reopened during the ceasefire period. That triggered a roughly 9% drop in oil prices on April 17 and helped lift the S&P 500 and Nasdaq to fresh record highs.

But by April 20, the situation had turned again. Reuters reported that tensions escalated after the United States seized an Iranian cargo ship, Tehran vowed retaliation, and Iran rejected a new round of peace talks. As a result, expectations of de-escalation were rapidly pulled back, causing oil prices to rebound by more than 6%.

The Associated Press reported the same pattern: oil prices jumped sharply again after renewed U.S.-Iran tensions in the Strait of Hormuz disrupted tanker traffic, with Brent rising to around $95.64 per barrel and U.S. crude climbing to about $87.90 per barrel. Although the ceasefire technically remained in place, the risk of collapse was enough for markets to immediately reprice supply concerns.

Why Is the Strait of Hormuz So Important?

The Strait of Hormuz is not merely a geopolitical flashpoint. It is a critical pressure valve for the global energy market. According to the U.S. Energy Information Administration (EIA), an average of around 20 million barrels of oil per day passed through the strait in 2024, equivalent to roughly 20% of global petroleum liquids consumption. The EIA also notes that flows through Hormuz account for more than a quarter of the world’s seaborne oil trade, while around one-fifth of global LNG trade also passes through the route.

The International Energy Agency (IEA) has further highlighted Asia’s dependency on the chokepoint. Around 20 million barrels per day, nearly 25% of global seaborne oil trade, move through Hormuz, and roughly 80% of that volume is destined for Asia. While alternative pipeline routes do exist through Saudi Arabia and the UAE, their combined spare capacity is estimated at only around 3.5 to 5.5 million barrels per day, which is nowhere near enough to fully replace Hormuz in the event of a major disruption.

In simple terms, the world does have side roads, but none of them are wide enough to replace the main highway. Global energy architecture, in its usual brilliant fragility, is built on the assumption that this narrow waterway keeps functioning.

What Is the Market Really Watching?

Reuters quoted Bob Savage of BNY as saying that the most important barometer of geopolitical risk has now been distilled into a single data point: the number of ships transiting the Strait of Hormuz.

That observation is especially important because it shows that markets have moved beyond reacting to political statements and are now focusing on real-world operating data. In other words, investors are no longer just listening to what officials say. They are watching whether goods are actually moving.

Reuters noted that Kpler data showed more than 20 vessels carrying oil products, gas, metals, and fertilizer passed through Hormuz on Saturday, the busiest day for the chokepoint since March 1. However, the presence of vessel traffic does not mean markets are comfortable again. Reuters also cited commentary from MST Marquee, which noted that shipowners are likely to remain highly cautious and will be reluctant to return to normal operations without credible proof that freedom of navigation has truly been restored.

That is precisely why oil prices rose sharply even though traffic had not come to a complete standstill. As long as supply risks remain, the geopolitical risk premium stays embedded in prices.

Why Haven’t Stocks Fallen More Sharply?

Part of the answer is that investors still believe the conflict may ultimately be contained. Reuters reported that Wall Street had just ended the previous week at record highs, supported by expectations for strong first-quarter corporate earnings, with most key reports due this week.

That means equities are being pulled in two opposing directions. On one side, there is geopolitical tension and rising oil prices. On the other, there is still solid support from corporate earnings expectations.

Markets are also watching inflation closely. If higher oil prices persist, they could reignite inflationary pressure and complicate the outlook for monetary policy easing. The IEA has stressed that restoring stable flows through Hormuz is the most important factor in reducing pressure on energy supplies, prices, and the broader global economy.

In its April 2026 oil market report, the IEA noted that at the time of writing, flows through Hormuz in early April were running at only around 3.8 million barrels per day, far below the more than 20 million barrels per day seen before the crisis. That suggests that even with a ceasefire in place, the energy market has not yet returned to anything resembling normal conditions.

What Should Investors Watch Next?

First, the number of ships continuing to pass through Hormuz. If traffic improves steadily, oil prices could cool just as quickly as they fell when news of the strait’s reopening emerged on April 17. On the other hand, if shipping remains minimal or further maritime incidents occur, oil is likely to retain a substantial geopolitical premium.

Second, the direction of U.S.-Iran diplomacy. Reuters reported that Iran rejected a new round of talks, while the United States continued to signal a willingness to increase pressure. That makes Tuesday’s ceasefire deadline an extremely sensitive milestone. A complete breakdown of the ceasefire would not only affect oil, but also the U.S. dollar, bond yields, shipping costs, and global inflation expectations.

Third, the week’s macroeconomic data. Reuters noted that markets are also awaiting UK inflation data, U.S. retail sales, and European PMI figures. With energy now at the center of market attention, these releases will be scrutinized for any sign that the current oil shock is beginning to threaten growth expectations and interest-rate policy.

Source: Reuters, AP