HomeAURising Oil Costs Drive ASX to Its Biggest Weekly Decline in Years

Rising Oil Costs Drive ASX to Its Biggest Weekly Decline in Years

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The S&P/ASX 200 Index was down 111.10 points, or by 1.2 per cent to 8829.50, taking total losses for the week to about 4 per cent.

The current week is on track to record its steepest decline since May 2022 when the Reserve Bank initiated its series of interest rate hikes.

AFR: Generics: ASX Ticker, Martin Place ASX, stock markets, stocks, Australian stock exchange, financial markets, company stocks, indices, stock ticker. Friday 23, January 2026 photo: Oscar Colman
The S&P/ASX 200 Index was down 111.10 points, or by 1.2 per cent to 8829.50. (Oscar Colman)

Oil prices surged following a US-Israel offensive against Iran, which led Iran’s Revolutionary Guard to attempt a blockade of the Strait of Hormuz earlier this week.

This strategic strait, positioned just south of Iran, serves as a critical passageway for transporting crude oil from major producers like Saudi Arabia and Kuwait to global markets.

Geopolitical tensions in the Gulf have rapidly impacted the global energy landscape, as the strait’s closure precipitates significant disruptions in oil production and distribution.

The Australian dollar experienced a one percent decline, briefly falling below 70 US cents, and as of 11 am (AEDT), it has marginally risen to just over 70 US cents against the US dollar.

The Australian dollar also dipped by one per cent, and at one point dipped under 70 US cents. As of 11am (AEDT), it is buying a tick over 70 cents against the Greenback.

A 1.5 per cent plunge would mark the dollar’s biggest drop since October last year.

FILE - Fishermen work in front of oil tankers south of the Strait of Hormuz Jan. 19, 2012, offshore the town of Ras Al Khaimah in United Arab Emirates. (AP Photo/Kamran Jebreili, File)
Iran’s Revolutionary Guard moved to close the Strait of Hormuz earlier this week. (AP)

Head of FX strategy at National Australia Bank Ray Attrill told the Australian Financial Review the scale of the fall is “relatively modest”.

“The Aussie is showing a degree of resilience,” he said.

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