Strait of Hormuz Ceasefire Collapse: How Markets Reacted to the Worst Oil Supply Disruption in History

Global markets slid sharply after the U.S.-Iran ceasefire collapsed on July 8, 2026, when fresh attacks on commercial tankers near the Strait of Hormuz prompted U.S. retaliatory strikes and President Trump declared the truce "over." The breakdown reignited the worst oil supply disruption in history, sent crude prices surging, hammered stock indices across Europe and Asia, shifted Fed rate hike expectations, and drew a stark warning from the World Bank that the conflict was driving global growth to its lowest since COVID-19.

Collapse of the Ceasefire

The ceasefire — initially agreed on April 8, 2026 — had held with difficulty before breaking down completely on July 8 . On that day, three commercial tankers were attacked near the Strait of Hormuz; U.S. forces struck Iranian targets in response, and Trump declared the ceasefire "over" . Brent crude rose about 5.6% toward $78 a barrel, and U.S. crude surged near $74.55 — the biggest one-day jump since early June . The Dow Jones Industrial Average fell around 600 points, and Seoul's KOSPI index dropped 5.35%, as chip and consumer stocks slid on renewed war fears .

Historic Oil Price Whiplash

The Strait of Hormuz crisis produced the "greatest oil supply disruption in history" and "the most dramatic price increase and collapse ever recorded in such a short period" . Brent crude hit $144.42 on April 7 (just before the initial ceasefire) and collapsed to $69.35 by July 3 . After the ceasefire broke, Brent spiked again. As of August 10, 2026, oil was climbing further — Brent rose more than 1% on August 10 alone — as Iran's demands for major concessions clouded any resolution . The World Bank projected Brent crude to average $94 per barrel in 2026, about 36% above 2025 levels .

European and Asian Stock Indices

Europe: The FTSE 100 tumbled 1.7% on July 8 as oil spiked . Germany's DAX and France's CAC had earlier surged on the initial April ceasefire (DAX +5%, CAC +4.7%), only to give back gains when tensions flared again . European stocks dropped sharply in late April after the U.S. seized an Iranian vessel, and the pattern repeated through each ceasefire setback .

Asia: Asian indices were highly sensitive to Hormuz news. On the initial April 8 ceasefire, Japan's Nikkei 225 surged 5.5% and South Korea's Kospi jumped as much as 5.7% . On news of a framework deal in mid-June, Asia-Pacific markets soared again . Conversely, renewed hostilities triggered broad declines across the region . As of July 8, Seoul's index dropped 5.35% .

U.S. Jobs Data and Fed Rate Hike Expectations

The U.S. economy unexpectedly shed 23,000 jobs in July 2026, against economists' forecasts of an 83,000 gain . May and June payrolls were revised down by a combined 103,000 jobs . The unemployment rate edged lower to 4.1%, but largely because more people left the labor force .

Fed impact: Before the weak July report, several Fed officials had made the case for raising rates in September . The jobs data drove markets to sharply downgrade those expectations: money markets priced in only a 56% chance of a rate hold in September (i.e., a roughly 44% chance of a hike), down from stronger odds of a hike previously . The bond market rallied, and the dollar fell against the yen and euro .

World Bank: Slowest Growth Since COVID-19

The World Bank described the closure of the Strait of Hormuz — which cut roughly 95% of ship transits through the chokepoint — as causing "unprecedented disruptions to global commodity supplies" . In its June 2026 Global Economic Prospects report, it cut the global growth forecast for 2026 to 2.5% from 2.9%, the slowest since the COVID-19 pandemic, citing higher energy prices, steeper inflation, and increased borrowing costs . The burden was described as falling disproportionately on energy-dependent developing countries .