Cook will transition to executive chairman on September 1, 2026, closing a tenure that took Apple from roughly $350 billion to around $4 trillion in market value.

Tim Cook is stepping away from the CEO seat he has held for more than 15 years. Apple announced on April 20, 2026 that Cook will transition to executive chairman, with John Ternus, the company’s senior vice president of hardware engineering, set to take over as CEO on September 1, 2026. It is the most consequential leadership change at the world’s most valuable company since Steve Jobs resigned in August 2011.

The operator who became the steward

Cook joined Apple in March 1998 as senior vice president of worldwide operations. He was not known as the company’s lead product visionary. He was the operator who rebuilt its engine. He helped slash Apple’s inventory levels, streamlined manufacturing, and built one of the most efficient supply chains in consumer electronics.

When Jobs fell ill, Cook stepped in as interim CEO on three separate occasions before taking the permanent role on August 25, 2011.

The numbers he leaves behind

Under Cook, Apple became the first U.S. company to hit a $1 trillion valuation in 2018, then crossed $3 trillion in early 2022. By 2026, it had approached the $4 trillion mark.

Apple generated more than $390 billion in annual revenue in fiscal 2024. Cook also oversaw the launch of the Apple Watch in 2015, the transition to Apple silicon in 2020, and the introduction of the Apple Vision Pro in 2024.

Silicon Valley reacts

The tributes arrived fast. Sam Altman posted on X: “Tim Cook is a legend. I am very thankful for everything he has done and I am very thankful for Apple.” Palmer Luckey kept it characteristically blunt, writing simply: “RIP Tim Apple.” Cook himself framed the move as continuity, not departure. “This is not a goodbye,” he said in a note shared publicly.

Tributes arrived quickly across the tech world, with executives, founders, and investors acknowledging Cook’s impact on modern business and technology.

Cook framed the move as continuity, not departure. This is a transition, not an exit.

What to watch

Ternus, 50 years old is a hardware lifer and one of Apple’s most respected internal operators. Cook had previously told singer Dua Lipa two years ago on her podcast At Your Service – “I really want the person to come from within Apple”.

The question now is whether a hardware engineer can steer a company whose next phase of growth increasingly depends on services, software, and AI.

Cook will remain executive chairman, which means the boardroom still carries his fingerprints. But the corner office belongs to someone new.