Westpac's interim profit fell short of market expectations, leading to a 3% decrease in its share price to $32.45. This underperformance also impacted other major banks, with Commonwealth Bank and National Australia Bank seeing declines of 1.6% and 1.8% respectively.

The energy sector was also affected, as Brent crude oil prices fell below $US60 a barrel following an announcement from OPEC+ about increased output. This led to declines in shares of companies like Woodside Petroleum and Santos, which dropped 3.6% and 4% respectively.

Market analysts suggest that these developments highlight the importance of closely monitoring corporate earnings reports and global commodity prices, as they can have significant impacts on market performance. Investors are encouraged to stay informed and consider diversifying their portfolios to mitigate potential risks associated with such market fluctuations.