Tim Cook took Apple to $4 trillion, now it’s John Ternus’ turn

When John Ternus takes over as CEO of Apple on September 1, he will be inheriting one of the most successful corporate legacies in modern tech, built over 15 years by Tim Cook.

Cook didn’t just steady Apple after Steve Jobs. He expanded it into a $4 trillion company. When he became CEO in fiscal year 2011, Apple’s market capitalisation stood at around $350 billion. Today, it has grown more than tenfold, while annual revenue has nearly quadrupled to over $416 billion in FY25.

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That growth came alongside a massive expansion of Apple’s ecosystem. The company now operates in more than 200 countries and territories, runs over 500 retail stores, and has built an installed base of more than 2.5 billion active devices. Under Cook, Apple also pushed aggressively into services, turning it into a $100 billion-plus business spanning iCloud, Apple Pay, Apple Music and Apple TV.

He also oversaw the launch of entirely new product categories, including Apple Watch, AirPods and Apple Vision Pro, while doubling down on Apple’s core lines like the iPhone and Mac. Crucially, Cook led Apple’s transition to its in-house silicon — the M series chips now used in the Mac and the iPad lineup — giving the company tighter control over performance and efficiency across devices.

Beyond products and profits, Cook reshaped Apple’s identity. He made privacy a core selling point, pushed accessibility, and cut the company’s carbon footprint by more than 60% since 2015 while the revenues surged.

A company in strong shape, but at a turning point

By most measures, Ternus is stepping into a business that is stable, profitable and and deeply embedded in its users' everyday lives.

Apple’s installed base remains vast, its ecosystem loyalty strong, and its dominance in the premium smartphone market intact, according to IDC. The iPhone, still the company’s biggest revenue driver, continues to anchor that ecosystem, despite the upgrade cycles stretching out.

Investors, too, see continuity in the transition. Apple shares dipped less than 1% after the announcement, with some initial surprise on Wall Street. But analysts broadly expect stability, especially with Cook staying on as executive chairman.

“Tim Cook did an amazing job… I hate to see him leave the CEO spot,” Rick Meckler of Cherry Lane Investments, told Reuters, adding that Cook is likely to remain involved in broader strategy. Others pointed out that the timing — just ahead of earnings — signals confidence in the company’s near-term performance.

Jacob Bourne of eMarketer noted that the transition “should provide some degree of reassurance,” even as it comes during a turbulent period marked by supply chain pressures, tariffs and rapid technological shifts.

According to analyst Ming-Chi Kuo, Ternus’ elevation suggests the board is looking beyond the iPhone-led playbook that has defined Apple for nearly two decades. Notably, Ternus does not come from the iPhone side of the business — an indication that Apple is prioritising broader platform experience over its most visible product line.

Also Read: Tim Cook to step down as Apple CEO: Read his memo to employees

The AI question looming over Apple

But the real test for Ternus isn’t the business Apple is today. It’s what comes next.

While Microsoft and Google are spending aggressively to push artificial intelligence across their ecosystems, Apple has taken a more measured approach.

The company has faced delays in rolling out a revamped Siri, with some AI features pushed back amid technical challenges and testing issues. At the same time, it has leaned on partners like Google for underlying AI capabilities, raising questions about how much of the stack Apple truly owns.

Even now, Apple is still playing catch-up internally, with reports suggesting it is ramping up efforts to strengthen its AI capabilities ahead of upcoming launches.

That hasn’t hit iPhone sales yet, but the risk is longer-term.

Advances in AI could reshape how people interact with technology altogether, potentially reducing the centrality of the smartphone. Competitors like Samsung, OpenAI and Meta are already betting on that shift, pushing into AI-first products and new form factors like smart glasses.

Ternus’ own philosophy doesn’t exactly chase the hype.

“We never think about shipping a technology… we always think about how we can leverage technology to ship amazing products,” he said in a recent interview with tech website Tom's Guide, underscoring a product-first mindset.

That approach aligns with Apple’s DNA, but could also be tested in an AI-driven era. Advances in AI, experts say, could reshape how people interact with technology, potentially challenging the central role of the smartphone. Competitors like Samsung, OpenAI and Meta are already pushing into new form factors, from AI assistants to smart glasses.

“The question is whether he has the appetite for the kind of bold, occasionally uncomfortable decisions that defining a new platform requires,” said Francisco Jeronimo, Vice President, Client Devices at IDC.

Because building great hardware, he notes, is a “well-defined problem.” Building an AI platform that developers and users actually adopt is something else entirely.

And this is where Ternus’ track record could matter.

Kuo points to the Mac’s transition from Intel to Apple Silicon as Ternus’ most important achievement—a full-stack shift across hardware, software and the developer ecosystem. Pulling that off, and turning it into a commercial success, required deep cross-functional coordination and system-level thinking.

In many ways, it was a “brain transplant” for the Mac.

That kind of experience—managing a platform-level transition—is exactly what Apple now needs as it moves toward on-device AI.

The insider bet

If there’s one thing working in Ternus’ favour, it’s familiarity.

He's been at Apple for over 20 years and is widely seen as a steady, detail-oriented leader with deep expertise in hardware. “Everyone loves him at Apple,” Reuters quoted Creative Strategies analyst Ben Bajarin as saying.

His track record reflects that reputation. Ternus has overseen major products from iPad to AirPods, and more recently led efforts behind the iPhone lineup and newer Macs. He also played a key role in Apple’s shift to its own silicon — one of the company’s most consequential bets in recent years.

That shows up in how he works. There’s the often-cited anecdote about him arguing over the exact number of grooves on a screw, something most users would never notice, but something he insisted had to meet Apple’s standards.

It’s a small story, but it captures the broader point that Ternus is a product perfectionist.

And that’s exactly why Apple picked him.

IDC sees his appointment as a deliberate move toward continuity, prioritising execution over disruption. In the short term, that makes sense. Apple’s core business is solid, its pipeline is steady, and its ecosystem isn’t going anywhere.

Also Read: Apple at 50: Beyond the iPhone, a new growth playbook takes shape

The supply chain and geopolitical layer

Ternus is also stepping into a company shaped heavily by Cook’s operational playbook.

Cook built one of the most efficient global supply chains in the industry, and that baseline is expected to hold. But Kuo notes that the next phase could require deeper technical engagement with suppliers—especially as Apple prepares for more complex, AI-driven hardware.

There are early signals of movement here as well. Apple’s key assembly partner Foxconn recently named a new rotating CEO for its iPhone business, seen by some as a move to strengthen ties with Apple during the transition.

At the same time, Cook’s role may not fully recede. He remains one of the few tech leaders with working relationships across both US and Chinese governments — something Apple is likely to continue relying on, particularly as geopolitical tensions and supply chain risks persist.The bigger question

The harder part is what comes next.

The iPhone has driven Apple’s growth for nearly two decades, but that cycle is maturing. The next wave of computing — whether it’s AI assistants, wearables, or something else entirely — is still taking shape.

That’s where the pressure on Ternus will be highest.

Cook leaves behind a company in strong financial health, with scale, loyalty and an unmatched hardware-software ecosystem. What Ternus has to figure out is how to extend that into the next era.

The products, most analysts agree, will be fine.

The platform question is the one that will define him.