Asian Stocks Decline as Surging Yields and Oil Prices Curb Risk Appetite

Asian equities retreated on Tuesday as a surge in U.S. bond yields and elevated oil prices dampened investor sentiment and spurred a move away from riskier assets. The negative sentiment followed a modest decline on Wall Street, with technology stocks across the region facing significant pressure.

Macro Headwinds Pressure Equities

Investor risk appetite was hit by a sharp rise in U.S. borrowing costs. The benchmark 10-year U.S. Treasury yield climbed above 5.27% overnight, its highest level in 19 years. Higher yields increase the discount rate used to value corporate earnings, making stocks less attractive, and raise borrowing costs for companies and governments.

Adding to inflationary concerns, oil prices remained high, with Brent crude trading around $107 a barrel. The sustained price strength comes amid geopolitical tensions affecting key shipping routes, according to market reports. These macroeconomic pressures have led traders to price in a higher probability of further interest rate increases by the U.S. Federal Reserve.

Tech Sector Falters on AI Concerns

The technology sector was a notable underperformer, weighed down by concerns about the pace and cost of artificial intelligence development. Hong Kong's Hang Seng TECH sub-index fell 1.2%, while Japan's SoftBank Group, a major technology investor, saw its shares slide 2%.

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Sentiment was impacted by a Wall Street Journal report that OpenAI had canceled the release of its next-generation AI model, GPT-6.1 Astra, after it failed internal safety checks. This news, coupled with reports of a pause in training for other advanced models, has raised questions about the huge investments underpinning the sector. A Reuters report on Anthropic's IPO prospectus further highlighted the immense costs, showing a $42 billion net loss in 2025 despite soaring revenue, alongside warnings of potential "catastrophic or existential risks" from advanced AI.

Regional Markets and RBA Outlook

The sell-off was widespread across the region:

• Japan's Nikkei 225 dropped 1.3%, while the broader TOPIX index fell 1.5%.
• South Korea's KOSPI declined 0.8%.
• Hong Kong's Hang Seng index lost 0.8%, and mainland China's CSI 300 was down 0.2%.

In contrast, Australia's S&P/ASX 200 edged up 0.1% as traders focused on the upcoming Reserve Bank of Australia (RBA) interest rate decision. The central bank is widely expected to raise its cash rate by 25 basis points to 4.60%. Investors will be closely watching Governor Michele Bullock's forward guidance for signals on future policy moves.