Tim Cook's final day as Apple CEO marks the end of a 15-year era that transformed the world's most valuable technology company from an iPhone-led hardware giant into a sprawling ecosystem spanning devices, software, subscriptions and financial services.
Cook took charge as Apple CEO in August 2011, succeeding co-founder Steve Jobs. On September 1, he will step down as chief executive and become Apple's Executive Chairman, handing over the top job to John Ternus.
Under Cook's leadership, Apple's market value surged from around $350 billion to more than $4.3 trillion, representing a roughly 13.3-fold increase. Apple shares have gained around 2,400% during his tenure, reflecting the extraordinary expansion in the company's earnings, ecosystem and investor valuation.
The Cook Era: From iPhone To Ecosystem
While the iPhone remained Apple's most important product throughout Cook's tenure, the company significantly broadened its product portfolio. Apple launched the Apple Watch in 2015, followed by AirPods in 2016 and the Vision Pro mixed-reality headset in 2024. These products helped Apple create new categories while strengthening the connectivity between its devices.
More than 3 billion iPhones have been sold under Cook, cementing the smartphone as the centre of Apple's ecosystem.
One of Cook's biggest strategic shifts was also largely invisible to consumers: Apple's transition away from Intel processors towards its own Apple Silicon chips. The move gave Apple greater control over the performance and architecture of its Mac computers while strengthening its vertical integration.
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At the same time, Apple's Services business expanded dramatically. Services, which accounted for only a single-digit share of revenue in the early part of Cook's tenure, now contribute roughly a quarter of the company's revenue. Subscriptions, payments, cloud services, advertising and other digital offerings have created a growing stream of recurring revenue and reduced Apple's dependence on hardware upgrade cycles.
Cook also expanded Apple's global footprint. The company opened its first official retail stores in India in 2023, marking another important step in its push into one of the world's largest and fastest-growing consumer markets.
What John Ternus Inherits
John Ternus will become Apple CEO on September 1, taking charge of a company that is vastly larger and more complex than the one Cook inherited in 2011. Ternus has led Apple's hardware engineering organisation since 2021 and has played a key role in the development of several of the company's major products.
His immediate challenge will be to sustain Apple's product momentum while navigating a rapidly changing technology landscape. The first major test could come quickly, with Apple's next major event scheduled for September 9.
A potential foldable iPhone could represent the next major product cycle for Apple, potentially opening a new premium category and giving the company another catalyst for growth.
However, artificial intelligence remains the biggest strategic challenge facing the new CEO. Apple has lagged rivals in rolling out consumer-facing generative AI capabilities, putting pressure on Ternus to accelerate the company's AI strategy without compromising its reputation for privacy, integration and product reliability.
As Cook moves into the Executive Chairman role, his legacy will be defined not simply by Apple's extraordinary rise in market value, but by how successfully he transformed the company into an ecosystem with multiple engines of growth. For Ternus, the challenge is no longer to build Apple into a global technology giant. It is to keep that giant growing.
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