Tim Cook is leaving Apple: 15 years, $4 trillion, and one big unanswered question

There are departures that surprise. And there are departures that the world has been waiting for so long that when they happen, no one raises an eyebrow. Tim Cook, the 65-year-old CEO of Apple, falls into the latter category. When Apple announced on Monday, April 20, 2026, that Cook would be handing over the reins of the company in September, the stock slipped 0.5 percent. So much for drama.

But behind this calm lies one of the biggest business stories of the last fifteen years. Cook took over Apple in 2011, when Steve Jobs was on his deathbed, and the company was worth some $350 billion. Today, Apple is worth more than 4 trillion dollars — making it one of only a handful of companies to ever reach that peak. Cook didn't do it with revolutionary visions of the future. He did it with operational genius, with supply chains, and with an ecosystem he honed over the years until it became invincible.

Supply chain as an art form

Steve Jobs was a visionary. Tim Cook was — and is — a supply chain engineer. That may sound like a slightly patronizing compliment, but it really isn’t. While Jobs demanded that every screw be perfect, Cook made sure it reached the customer on time and at the right price. Without Cook, Jobs' vision would just be a nice idea on a poster.

Under Cook's leadership, Apple built a global supplier network that became a model for business schools around the world. He expanded the store network to more than 200 new locations, transformed the Chinese market into Apple's second home, and created a service business — Apple Services — that now generates $100 million annually. $106 billion revenue. Apple Music, Apple TV+, iCloud, Apple Pay: these are all Cook's children, not Jobs'.

Apple's net profit for fiscal year 2025 was $112 billion — eight times more than in 2010. A 699 percent increase despite the pandemic, geopolitical tensions between the US and China, and ongoing pressure from regulators around the world. No matter how you look at Cook, you can't ignore these numbers.

“Cook’s greatest achievements are the company’s financial transformation, the integration of Apple silicon, and maintaining the iPhone’s dominance in the global market.” — analysts, BusinessToday

The Apple Watch is taking down the Swiss watch industry. Literally.

Cook is credited with two products that opened up entirely new categories for Apple: Apple Watch and AirPodsIt may sound frivolous, but look at the numbers. The Apple Watch sold 30.7 million units — while the entire Swiss watch industry sold only 21.1 million watches. In one fell swoop, Cook buried the watch as a fashion accessory and resurrected it as a medical device.

AirPods? These two wireless headphones have become more of a status symbol than many luxury brands. And that's in a category that didn't even exist as a mass product before Apple. Cook did these things with method, not inspiration. Which, in its own way, is equally impressive.

Under Cook's leadership, Apple reached a trillion-dollar valuation in 2018, two trillion in 2020, three in 2022 — and in October 2025, it became the third largest company in the world with a value of 4 trillion dollars, behind Nvidia and Microsoft. That was Cook at work.

Siri and artificial intelligence: an open wound

And here we move on to the topic that spoils Cook's glowing statement: artificial intelligence.

Apple Intelligence — Cook's assurance to the world that Apple knows what it's doing with artificial intelligence — was met with a mix of bewilderment, mockery, and mild embarrassment. The web quickly came up with a nickname: “Apple Ignorance”Announced features were delayed, promises were left unfulfilled, and Siri was inferior to voice assistants introduced by competitors years earlier.

Cook hired John Giannandro from Google in 2018 with great fanfare — he was supposed to be Apple’s AI chief who would write the future. He was quietly gone by 2025. In parallel, other senior AI researchers left Apple, including Ruoming Pang, who went to Meta. ChatGPT changed the rules of the game in November 2022, and Apple suddenly found itself three to four generations behind the competition. For a company with such a reputation — painful.

In January 2026, Apple announced a partnership with Google to integrate Gemini into Siri and Apple Intelligence for more advanced cloud-based tasks. Somewhere in Cupertino, someone typed words that Apple would never have imagined years ago: “We need Google.”

This was a clear signal that Apple — despite all its power — is currently lagging behind, not leading, in the artificial intelligence race.

And the hardware? Hardware is sacred.

But while Apple was putting the field of artificial intelligence on the back burner, what might be Cook's true legacy was quietly maturing in the background: Apple Silicon.

The move from Intel processors to its own M-series chips was one of the boldest engineering feats in the history of consumer electronics. M1, M2, M3, M4 — each one left the competition behind. The MacBook with these chips became a serious professional alternative for anyone who previously swore by Windows workstations.

Apple is not just a smartphone company these days. It is one of the best hardware providers on the planet — for phones, laptops and increasingly for computing on in the field of artificial intelligence. Apple's chips power machine learning models with extreme energy efficiency. When it comes to edge computing — processing data on a device instead of in the cloud — Apple has no equal. This will be Ternus' strongest point.

John Ternus: engineer, swimmer, successor

From September 1, 2026, Apple will lead John Ternus, a 51-year-old mechanical engineer at the University of Pennsylvania, a former competitive swimmer, and a man who spent 25 years at Apple. His hand has been on every iPhone, iPad, AirPods, and Apple Watch of the past decade. He was the face who introduced Apple Silicon to the world on stage.

Ternus has been with Apple since 2001. He started designing monitors. Today, he's taking over a $4 trillion company.

“He has the mind of an engineer, the soul of an innovator, and the heart to lead with integrity and honor.” — Tim Cook on Ternus, Apple Newsroom, April 2026

Ternus, at 51, mirrors Cook at his swearing-in. Experts describe him as someone who combines Jobs' obsession with the product with Cook's decision-making ability. Technical enough to understand every screw. Charismatic enough to assert yourself on the keynote stage. His task will be challenging: to make Apple a relevant company in the field of artificial intelligence — while maintaining the dominance in the hardware field, which is Cook's true legacy.

Also interesting: Apple continued its tradition of internal promotions in choosing Ternus. No outside star, no upcoming savior from Silicon Valley. Apple grows from within. That in itself says a lot about the company's culture.

Conclusion: The end of an era, but not the end of Apple

Tim Cook was not Steve Jobs. He never claimed to be. He was what Apple really needed after Jobs' death: a man who wouldn't cut a deal, but would fulfill it to the letter. Under him, Apple became the world's leading consumer hardware company, with an ecosystem that one and a half billion users find it difficult to leave.

Its weakness? Artificial intelligence. That much is clear and unvarnished. Apple lagged, improvised, and relied on partners as competitors built their own language models from scratch. But Apple has a weapon that others don’t: hardware. When the world realizes that AI is most effective on the device, not in the cloud — Apple will be there, with the best chips, the best integration, and the ecosystem that Cook spent 15 years building.

John Ternus takes the reins at one of the few companies in the world where “hardware is the future” doesn’t sound like nostalgia, but rather a strategic vision. Cook made Apple a vault. Ternus's job is to make it a laboratory of the future.

And Tim Cook? He'll probably leave Cupertino with a smile in September. He deserves it. Twice.