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Oil prices jumped in early trading as the US announced further attacks for a ninth consecutive night. Iran has responded to the strikes by targeting US allies across the Middle East.
Brent crude, the international benchmark, rose 3.2% to $90.95 per barrel, while US benchmark crude climbed 2.8% to $84.04 per barrel.
“The US and Iran continue to exchange strikes, which are proving to be deadly for both sides,” ING commodities strategists Warren Patterson and Ewa Manthey wrote in a commentary on Monday.
“If this escalation goes unchecked, we could return to an environment of widespread attacks across the Persian Gulf,” they added.
Tanker traffic through the Strait of Hormuz, a crucial waterway for global oil transport, has nearly ground to a halt, adding to pressure on supplies, they noted.
Elsewhere, AI-related shares including chipmaking stocks declined on Friday, pulling world markets lower. Pledges of huge spending on AI are fuelling worries the sector may be in a bubble, and many investors have opted to sell to lock in profits from recent big gains.
“The return to war in the Strait of Hormuz may start to weigh more heavily on financial markets before too long, especially if even strong tech earnings reports continue to be met with scepticism,” Jonas Goltermann, chief markets economist at Capital Economics wrote in a note Monday.
Markets were also shaken by the rollout of another powerful Chinese AI model, this time by Beijing-based Moonshot AI.
The impact of the new Kimi K3 open-source AI model was similar to when China’s “ DeepSeek moment” rattled world markets in early 2025. It was viewed as another sign of how lower-cost, capable Chinese AI models are increasingly challenging rivals like Anthropic’s Claude and OpenAI’s GPT.
Additional sources • AP