Ternus Takes Apple’s Helm With an AI Test Cook Couldn’t Finish

Ternus Takes Apple’s Helm With an AI Test Cook Couldn’t Finish
Tim Cook’s supporters see a disciplined builder who made Apple richer and more durable; critics see an unresolved AI gamble. John Ternus now has to protect that machine while proving it can still surprise consumers.

2011–2026: Cook took over in August 2011 and turned Apple from a company tied tightly to device cycles into a services-and-subscriptions powerhouse. By the eve of his departure, its market value had risen from $347 billion to $4.7 trillion, while the stock had climbed 2,272%, according to one accounting of his tenure. The company said it had more than 1.5 billion paid subscriptions across its platforms, a measure of the recurring business Cook built around the iPhone.

Cook’s final day: In a farewell note to staff, Cook argued that Apple’s culture — rather than any individual executive — had made the company. “This place is proof that culture triumphs over everything,” he wrote, while stressing that he was not leaving Apple and calling Ternus “brilliant and wonderful and capable.” Aravind Srinivas, the Perplexity CEO, echoed the praise on X, saying Cook had shipped “at that scale without letting the bar for excellence slip.”

Tuesday’s handoff: Ternus became chief executive after Cook’s 15-year run, with Cook remaining executive chair. The transition was expected to be smooth, but the incoming CEO faces leadership churn, a fight to retain talent amid competition from firms such as OpenAI, and pressure to distinguish his own leadership from Cook’s. A foldable iPhone expected at Apple’s hardware event could give Ternus an early chance to signal that the company’s hardware imagination has not dimmed.

The unfinished test: Apple’s AI strategy is the sharper risk. The company’s privacy-focused Apple Intelligence plan suffered delays, and its revamped Siri arrived only after Apple relied on Google models. That restraint may look savvy if frontier models become commodities; it may look costly if an AI rival turns its software into the next dominant hardware platform. Ternus inherits Cook’s financial discipline — and the burden of showing it can still produce the next big thing.

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