Highlights

• Brent crude briefly rose above US$107 a barrel after Houthi forces attacked Saudi Aramco facilities in the Red Sea.
• Oil fell back to around US$104 on reports that the US and Iran were still discussing a deal to reopen the Strait of Hormuz, but the dip did not last.
• The 30-year US Treasury yield reached 5.5%, its highest since 2004, and the 10-year yield touched 5.2%, its highest since 2007.

Introduction

Global markets came under fresh pressure in the most recent session, according to reports on 25 September 2026. Rising Middle East tensions pushed oil prices sharply higher and added to a sell-off in US government bonds. The combination of supply risk and higher borrowing costs adds to the inflation concerns already hanging over markets.

Red Sea Attacks Drive Oil Higher

Crude jumped above US$107 a barrel after the Houthis, a group aligned with Iran, attacked Saudi Aramco facilities in the Red Sea. The attacks raised new fears about supply from one of the world's largest oil producers, as energy routes in the region are already disrupted.

Adding to the pressure, a senior Iranian military official warned that Tehran could extend the conflict beyond the Persian Gulf in response to further US or Israeli strikes. That warning raised the risk of disruption across a wider stretch of global shipping and energy infrastructure.

Hormuz Talks Offer Only Brief Relief

Prices eased to about US$104 a barrel after reports that Washington and Tehran were still exploring an agreement to reopen the Strait of Hormuz. The strait is one of the world's most important routes for oil shipments, so any sign of progress tends to calm supply fears. This time, though, the relief was short-lived and prices soon climbed again. Traders appear to see the risks as still weighted towards further disruption.

US Bond Yields Climb to Two-Decade Highs

The oil spike deepened an existing sell-off in US Treasuries. Higher energy prices can feed into inflation and make it harder for central banks to cut interest rates. The 30-year Treasury yield rose 0.1 percentage point to 5.5%, its highest level since 2004. The 10-year yield touched 5.2%, a level last seen in 2007.

Higher long-term yields raise borrowing costs for governments, companies and households. They also tend to weigh on share valuations, especially for growth companies whose value depends on earnings far in the future.

What It Could Mean for Australian Investors

Moves in global oil prices and US bond yields often flow through to Australian markets. Energy producers can benefit from higher crude prices. Transport companies, fuel-heavy industries and consumer-facing businesses may face higher costs. Rising US yields can also put upward pressure on Australian bond yields and affect sectors sensitive to interest rates, such as property and technology.

Outlook

Markets are likely to stay volatile while the situation in the Middle East remains unresolved. Investors will watch for progress in the US–Iran talks on the Strait of Hormuz, any further attacks on energy infrastructure, and whether the bond sell-off continues. A lasting agreement could ease oil prices and yields. Further escalation could keep both elevated for longer.

Note- All data presented is based on information available at the time of writing.

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