Apple's market capitalization has surpassed $4 trillion for the first time, making it the third major tech company to achieve this milestone. The surge is attributed to robust demand for its latest iPhone, which has alleviated concerns about Apple's slower progress in the AI sector. Since the iPhone's release on September 9th, Apple's stock has climbed approximately 13%, marking its first positive return this year. Chris Zaccarelli of Northlight Asset Management highlighted the iPhone's significant contribution to Apple's profits and revenue, emphasizing its role in expanding Apple's ecosystem. In related news, OpenAI has completed its restructuring, boosting Microsoft's market capitalization back to $4 trillion, a level it first reached in late July.