Tim Cook Steps Down as Apple CEO. John Ternus Takes Over Today.

Tim Cook’s tenure as Apple CEO is officially over. Effective today, September 1, 2026, John Ternus — Apple’s former senior vice president of hardware engineering — takes over as the company’s third chief executive. Cook moves into the newly created role of executive chairman of Apple’s board of directors.

The transition was not a surprise. Apple announced it in April, giving investors, employees, and the industry four months to prepare. But the moment itself is significant. This is only the second CEO transition in Apple’s modern history. And Ternus represents a genuinely different kind of leader from his predecessors.

Tim Cook’s 15-Year Record

When Tim Cook became CEO in August 2011 — following Steve Jobs’ resignation six weeks before his death — Apple’s market capitalisation was approximately $350 billion. Today, as he steps down, it has touched $5 trillion. Apple became the first publicly traded US company to reach $1 trillion in 2018, crossed $2 trillion in 2020, surpassed $3 trillion in 2022, and hit $4 trillion in October 2025. In July 2026, it briefly overtook Nvidia to become the world’s most valuable company.

Cook’s tenure produced products that reshaped entire industries. The Apple Watch created a new category of wearable computing. AirPods became one of the most profitable consumer electronics products ever made. Apple Silicon, the transition from Intel chips to Apple’s own ARM-based processors, was one of the most successful platform migrations in computing history, the Apple Pay changed how hundreds of millions of people think about transactions. Apple TV turned a hardware hobby into a prestige streaming platform.

What Cook didn’t do was invent things the way Jobs did. His genius was operational: supply chains, margins, services revenue, and the patient scaling of Apple’s ecosystem into the most profitable consumer technology business on earth. Revenue grew from $108 billion in his first year to more than $420 billion in fiscal 2025. The services division — App Store, iCloud, Apple Music, Apple TV, Apple Pay — grew from almost nothing to more than $100 billion per year in revenue.

Who Is John Ternus?

Ternus joined Apple’s product design team in 2001 — the same year the original iPod launched. He became vice president of hardware engineering in 2013 and was elevated to senior vice president in 2021. Over 25 years at Apple, he has overseen the engineering of essentially every major Apple hardware product: the iPhone, iPad, Mac, AirPods, Apple Watch, and Apple Silicon.

He is not a public figure in the way Cook became one. He has not done many media interviews. Ternus doesn’t have Cook’s polish on a stage or Cook’s ease in Washington policy conversations — which is part of why Cook’s executive chairman role specifically includes “engaging with policymakers around the world.” The division of labour is deliberate. Ternus builds things. Cook manages the external relationships Apple’s scale demands.

Cook has described Ternus as having “the mind of an engineer” and “the soul of an innovator” — and called him the “perfect person” to lead Apple into its next chapter. Apple chairman Arthur Levinson echoed the sentiment, noting Ternus’s deep product instincts and his ability to lead large, complex engineering organisations.

The read from inside Apple, from everyone who has spoken publicly about the transition, is consistently positive. The concern from outside — from investors and analysts — is whether a hardware engineer who has spent his entire career inside Apple can navigate the AI era, the regulatory environment, and the competitive dynamics of a market that has changed significantly in the past five years.

The Challenge Ternus Inherits

Apple enters the Ternus era with genuine strengths and genuine vulnerabilities.

The strengths are formidable: 1.5 billion active devices, the most profitable consumer hardware business in history, a services revenue line that throws off enormous cash, and Apple Silicon that now genuinely leads the PC market on performance-per-watt. The September 9 hardware event — Ternus’s first as CEO — is expected to reveal the iPhone 18 Pro, iPhone 18 Pro Max, and potentially Apple’s first foldable iPhone. His first product announcement sets the tone.

The vulnerabilities are real. Apple’s AI story has been the weakest of any major technology company. Siri fell so far behind ChatGPT and Gemini that Apple was forced to replace it with a Gemini-powered system for iOS 27 — and to open the platform to Claude and ChatGPT through the new Extensions framework. The AI gap isn’t closed; it’s been papered over with partnerships. Ternus, as a hardware engineer, will need to decide what Apple’s long-term AI strategy actually is — whether to continue building dependence on external AI providers, or to invest heavily in building competitive AI capability from within.

There is also a regulatory environment that is more hostile to Apple than at any point in Cook’s tenure. The EU’s Digital Markets Act has forced Apple to open the App Store, allow alternative app stores in Europe, and now open iOS to competing AI assistants. The US Department of Justice antitrust case against Apple is ongoing. Ternus has no obvious track record navigating these battles — which is precisely why Cook remains close at hand as executive chairman.

What Changes and What Doesn’t

In the near term: not much visible to consumers. Apple’s product roadmap was set long before today’s handover. The September 9 event proceeds as planned. The iPhone 18 launches as planned. The Mac lineup — including the M6 Mac mini launched last week — continues its trajectory.

What changes is the orientation at the top. Cook ran Apple as a services and operations company that happened to make exceptional hardware. Ternus is, at his core, a product engineer. The questions that matter most to him are: is this the right design, does this work the way it should, is this the best we can build? Those are different questions from the ones Cook prioritised.

Whether that shift produces a new category of Apple product — the kind of thing Jobs was famous for, the kind Cook never quite managed — is the central question of the Ternus era. He has the engineering team, the manufacturing relationships, and the financial resources to attempt it. He now has the title too. For the full context of Apple’s current hardware lineup, see our coverage of the Mac mini M6 launch and the iOS 27 Extensions announcement that defined Cook’s final months in charge.

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