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Global Markets Respond to US-Iran Conflict and Strait of Hormuz Disruptions

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US-Iran Conflict (2026): Global Markets and Geopolitical Fallout

The US-Iran military conflict, which commenced in March 2026, has significantly disrupted global financial markets and energy supplies, primarily through the effective closure of the Strait of Hormuz.

Market volatility has been driven by a series of diplomatic statements, military actions, and ceasefire negotiations, with investor sentiment swinging between optimism about a resolution and concern over prolonged instability. The S&P 500 index initially fell approximately 10% from its January record before recovering to surpass it, while oil prices surged from under $70 per barrel to a peak of $119 before settling at lower levels following ceasefire agreements.

Geopolitical Developments and Diplomatic Timeline

Initiation and Early Escalation

  • The US and Israel initiated a military campaign against Iran in early 2026.
  • The Strait of Hormuz, a critical passage for approximately 20% of the world's oil and oil derivatives, was effectively closed by Iran.
  • Iran permitted passage for some oil tankers from allied nations, reportedly collecting yuan-denominated tolls.
  • The US deployed approximately 10,000 additional Marines and airborne troops to the Middle East.

Negotiation Attempts and Ultimatums

  • President Trump issued a 48-hour ultimatum to Iran to reopen the strait, which was subsequently extended to five days and then to 10 days.
  • Trump stated that progress was being made in negotiations; Iranian officials denied that such negotiations occurred.
  • Reports indicated that Trump and his aides assessed that a military operation to fully reopen the Strait of Hormuz would extend conflict beyond a preferred four-to-six-week timeline.

Ceasefire and Peace Agreements

  • A ceasefire agreement was reached in April, leading to a temporary reopening of the Strait of Hormuz and a 15% decline in oil prices.
  • The ceasefire was tested by subsequent military actions, including Israeli strikes on Hezbollah and Iranian halting of shipping through the strait.
  • A tentative 60-day ceasefire extension was reportedly agreed upon, pending finalization of documents.
  • Pakistan's army chief met with Iran's parliament speaker regarding ceasefire discussions.
  • On June 2, 2026, President Trump announced a peace deal including an immediate ceasefire and the reopening of the Strait of Hormuz, with a signing ceremony scheduled in Switzerland.

Ongoing Tensions

  • Iran stated it would skip further ceasefire talks while the US blockade remained in place.
  • Iran declared the strait open on April 18, but it was closed again after Trump stated the US blockade would remain.
  • The US fired on and seized an Iranian ship on April 20.
  • Iran's paramilitary Revolutionary Guard attacked three ships in the Strait of Hormuz on April 23.
  • US President Trump extended a ceasefire but maintained a blockade of Iranian ports.
  • Trump rejected Iran's response to a US peace proposal as "totally unacceptable."
  • The US conducted a fresh round of strikes against targets in Iran, with Trump stating, "We're going to be attacking them, attacking them very hard."

Impact on Global Financial Markets

United States Equity Markets

  • The S&P 500 index fell approximately 7.7% from the start of the conflict to its low in late March.
  • The technology-focused Nasdaq index dropped over 10% from the start of the conflict, meeting the definition of a "correction."
  • By late April 2026, the S&P 500 had recovered more than 10% from its low to reach a new record high of 7,022.95.
  • By early May, the S&P 500 rose to 7,041.28, marking its 11th gain in 12 trading sessions.
  • The Dow Jones Industrial Average increased to 48,578.72, and the Nasdaq composite gained to 24,102.70.
  • Following the ceasefire announcement, the S&P 500 rose 1.7%, the Dow Jones Industrial Average gained 0.9% to a record, and the Nasdaq composite jumped 3.1%.
  • The S&P 500 recorded a 0.6% gain to an all-time high of 7,519.12, while the Nasdaq composite reached a record 26,656.18.

Australian Equity Markets

  • The S&P/ASX 200 index declined approximately 7.4% from the conflict's start.
  • On March 31, 2026, the ASX 200 rose 0.3% to 8,481.80 after a report indicated Trump's willingness to end the conflict even if the Strait remained closed.
  • The index later rose 0.5% to 8,970.80 following statements from Trump expressing optimism about a potential agreement with Iran.
  • Following the ceasefire, the ASX jumped 2.8% and later gained 1.3% on the day after the peace deal was announced.
  • After the peace deal announcement, the ASX 200 gained 1.4% to 8,923.20.

Bond Markets

  • US bond yields increased significantly since the conflict began:
    • Two-year yield: 63 basis points above pre-conflict levels
    • Ten-year yield: 49 basis points higher
    • Thirty-year yield: 36 basis points higher
  • The 10-year US Treasury yield rose to 4.31% from pre-war levels of 3.97%.
  • The yield on the 10-year Treasury later rose to 4.47% and the 30-year yield reached 5.12%, the highest since mid-2007.
  • Global bond yields rose sharply, with the UK 30-year yield reaching 5.85%, the highest since 1998.

Currency Markets

  • The Australian dollar traded in a range between US68.49¢ and US72.25¢ during the conflict.

Energy Markets and Commodities

Oil Prices

  • Oil prices rose from approximately $70 per barrel (Brent crude) before the conflict.
  • Brent crude peaked at $119 per barrel during the conflict.
  • Following reports of potential de-escalation, oil prices stabilized:
    • West Texas Intermediate (WTI): approximately $103 per barrel
    • Brent crude: approximately $107 per barrel
  • After the ceasefire announcement, Brent crude fell 4.8% to $83.17 per barrel.
  • Following the peace deal, Brent crude fell 4.1% to $83.74 per barrel.
  • Oil prices later dropped below $89.50 per barrel on hopes for reopening the Strait of Hormuz.
  • Oil prices fluctuated significantly throughout the conflict, remaining well above pre-war levels.

Broader Commodity Impacts

  • Gold prices decreased approximately 15% from the start of the US-Israeli operation.
  • Iron ore negotiations between BHP and China were reported to be progressing.

Sector and Company Performance

Energy Sector

  • Energy stocks generally rose when oil prices increased and fell when oil prices moderated.
  • Woodside, Santos, Ampol, Viva Energy, Yancoal, and Whitehaven Coal were among the stocks affected.

Materials Sector

  • Gold miners (Northern Star, Evolution Mining, Newmont) traded higher when gold prices increased.
  • Iron ore giants (BHP, Rio Tinto, Fortescue) showed mixed results.

Financial Sector

  • Major Australian banks (CBA, Westpac, NAB, ANZ) showed varied performance, generally supporting market gains.

Consumer and Industrial Sectors

  • Airlines (Qantas, Virgin Australia) and travel agencies (Flight Centre) gained on reports of potential conflict resolution.
  • Travel stocks declined on concerns about travel disruptions and rising fuel costs.
  • Qantas revised its fuel cost outlook upward, citing increased jet fuel prices.

Technology Sector

  • Australian tech stocks (WiseTech, Xero, Technology One) experienced gains.
  • US tech stocks showed significant volatility, with the Nasdaq declining over 10% before recovering.

Economic Implications

Inflation Concerns

  • The conflict contributed to rising global inflation, with US gasoline prices increasing from $2.92 to over $4 per gallon.
  • US inflation reached 3.8% (consumer) and 6% (wholesale), partly attributed to tariffs and war-related energy costs.
  • The Federal Reserve's preferred inflation gauge, the PCE price index, rose 4.1% in May from a year earlier, the largest annual increase since April 2023.

Interest Rate Expectations

  • Prior to the conflict, the bond market anticipated at least two US Federal Reserve rate cuts in 2026.
  • After the conflict, expectations shifted to one cut projected for late in the year.
  • Markets showed over a 30% probability of a rate increase.

Economic Growth Concerns

  • Economists warned of potential stagflation (persistent inflation combined with stagnant growth).
  • Concerns were raised about supply chain disruptions affecting crude oil, diesel, jet fuel, fertilizers, and aluminum.
  • The International Energy Agency described the situation as "the largest energy security threat in history."
  • US economic data showed:
    • First-quarter GDP growth revised to 2.1% annual pace
    • Consumer spending fell sharply compared to the fourth quarter of 2025
    • US employers added 115,000 more jobs than they cut in April
    • US retail sales fell more than expected in April

Global Economy

  • Europe faced an energy crisis similar to the one following the Russia-Ukraine conflict, with reduced fiscal capacity to respond.
  • Asian economies were significantly affected by increased oil and gas prices.
  • China reported 5% economic growth for the January-March quarter, though economists noted its export sector could face challenges from slower global growth.

Key Statements and Reports

Trump Administration Positions

  • Trump stated he would not be in Iran "too much longer" and expected US action to end within two to three weeks.
  • Trump indicated willingness to end the conflict even if the Strait of Hormuz remained largely closed.
  • Trump described Iran's response to the US peace proposal as "totally unacceptable."
  • Trump stated in a social media post that Iran had requested a ceasefire; the Iranian regime denied this.
  • Trump suggested the US would not seek to reopen the Strait of Hormuz and advised European allies to secure their own oil.

Iranian Positions

  • Iran denied negotiations occurred with the US.
  • Iran stated it would skip further ceasefire talks while the US blockade remained in place.
  • Iran offered to reopen the strait if the US ends its blockade.
  • Iran's state news agency reported that President Masoud Pezeshkian informed the European Council's president of Iran's readiness to end the war, conditional on guarantees preventing its recurrence.

Central Bank Statements

  • Federal Reserve Chair Jerome Powell stated the Fed aimed for a 2% inflation target but noted limited control over supply shocks like rising energy prices.
  • Fed Governor Christopher Waller said the US economy is at risk of a "COVID-style inflation shock" from the war.
  • The Reserve Bank of Australia indicated challenges in confidently predicting future policy direction after two interest rate hikes.

Expert Analysis

  • ING Bank strategists noted that a breakdown in peace talks between the US and Iran represents a key market risk.
  • Capital Economics stated that global financial markets require evidence that the conflict is "winding down."
  • Deutsche Bank developed a "Trump pressure index" tracking changes in approval ratings, market performance, and inflation expectations.