Tim Cook stepped down as CEO of Apple on Monday, marking the end of his tenure at the helm of the company.

The leadership transition occurs just days before Apple's next product event on Sept. 9. This shift ensures the company has a settled executive lead before unveiling its latest hardware and software updates to the public.

John Ternus is scheduled to officially assume the role of CEO on Sept. 1 [1]. The transition follows a period of significant growth for the tech giant under Cook's leadership.

Cook served as the CEO of Apple for 15 years [2]. During his tenure, the company saw a massive increase in its market valuation. Apple was a $350 billion company when Cook inherited the position in 2011 [3]. By the time Ternus takes over, the company is valued at $4.6 trillion [4].

Cook shared a farewell with employees on his final day [5]. The transition marks the first time in over a decade that the company has changed its top executive.

Apple has not released further details regarding the internal restructuring that may accompany the change in leadership. However, the timing suggests a desire for stability and continuity as the company enters its next product cycle [6].

Tim Cook served as Apple CEO for 15 years

The transition from Tim Cook to John Ternus represents a pivotal shift for Apple, moving from a long-term era of massive scaling to a new leadership phase. By timing the handover immediately before the Sept. 9 event, Apple avoids the uncertainty of a leadership vacuum during its most critical marketing window of the year. The jump in valuation from $350 billion to $4.6 trillion under Cook sets a high benchmark for Ternus, who must now maintain growth in an increasingly competitive global tech market.