Tim Cook, the long-serving chief executive of Apple Inc., has announced plans to step down from his role, signaling a major leadership transition for one of the world’s most influential technology companies.

The transition, set to take effect in September 2026, will see Cook move into the position of executive chairman, while John Ternus currently Apple’s head of hardware engineering will assume the role of chief executive officer.

Cook’s departure concludes a tenure that began in 2011, when he succeeded Steve Jobs. Over the past decade and a half, he has overseen a period of extraordinary growth, transforming Apple into one of the most valuable companies globally, with its market valuation rising from hundreds of billions to several trillion dollars.

Under his leadership, Apple expanded beyond its flagship iPhone business into new product categories and services. The company introduced widely successful products such as the Apple Watch and AirPods, while also building a robust ecosystem of digital services, including streaming, cloud storage, and app-based revenues.

Despite these achievements, the leadership transition comes at a time when Apple faces increasing pressure to innovate in emerging technologies, particularly artificial intelligence. Analysts suggest that the incoming CEO will be tasked with accelerating the company’s strategy in this area to remain competitive with other global tech firms.

Market reactions to the announcement have been cautious, reflecting the significance of Cook’s leadership and the uncertainty that often accompanies such transitions. Apple’s shares experienced slight fluctuations as investors assessed the implications of the change.

Cook is expected to remain closely involved in Apple’s strategic direction as executive chairman, focusing on global policy engagement and long-term initiatives. His continued presence is seen as a stabilizing factor during the transition, particularly given his experience navigating complex geopolitical and regulatory environments.

The appointment of John Ternus reflects Apple’s preference for internal leadership continuity. Having spent more than two decades at the company, Ternus has played a key role in hardware development and is widely regarded as a trusted figure within Apple’s executive team.

As Apple prepares for this leadership shift, the move marks not only the end of Cook’s era but also the beginning of a new chapter that will likely define the company’s direction in the evolving global technology landscape.