On the 28th (local time), during morning trading on the Nasdaq, both Apple and Microsoft witnessed a surge in their stock prices, marking the first-ever simultaneous crossing of the US$4 trillion market cap threshold. This development has created a 'Big Three' scenario in the global capital market, joining NVIDIA, which boasts a market cap exceeding US$4.6 trillion.

On that day, Microsoft's stock price surged by over 3%, buoyed by reports that its partner, OpenAI, had successfully concluded a capital structure reorganization. As a result, Microsoft will now possess roughly 27% of the shares in OpenAI Group PBC, with its total investment surpassing US$13 billion.

Since the unveiling of its latest iPhone on September 9, Apple's stock price has amassed an approximate 13% increase. This marks the first instance of positive growth for the company this year, effectively easing external apprehensions regarding its perceived lag in artificial intelligence development. JPMorgan analysts have consequently raised Apple's target price to US$290 per share.