Nvidia briefly became the most valuable listed company, surpassing Apple, driven by the demand for AI systems.Nvidia's market capitalisation reached $3.53tn, slightly above Apple's $3.53tn.Nvidia has benefited from its position as the dominant supplier of AI accelerator chips for data centres.Nvidia's stock surged 18% in October, fueled by a $6.6bn funding round for OpenAI and strong demand for AI chips.