Tim Cook’s 65th birthday is on the horizon (Nov. 1, to be exact), and with the Apple CEO’s special day looming, talks have allegedly been building within the company regarding his potential successor. To be clear, Cook has made no official public mention of retirement or stepping down. But according to Bloomberg’s Mark Gurman, the tech giant is working behind the scenes to ensure a seamless transition when the time comes.

Cook replaced Steve Jobs in 2011, and after a period of uncertainty, Cook ushered Apple into its most profitable era. Stock-watching website Stocktwits reports that the company’s stock increased about 1,800% since Cook took over leading the company.

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Jobs may have introduced devices like the iPhone into everyday use that changed how we interact with technology, but Cook expanded on the Apple experience. Under his guidance, the company built upon Apple’s smartphone by introducing subscription services and more mobile products, including earbuds and wearables.

He introduced Apple Pay, Beats headphones became part of the company’s ecosystem, the Apple Watch launched 10 years ago, and Apple even entered the entertainment business, producing original Oscar-winning movies and Emmy-winning TV shows through Apple TV Plus.

When Cook steps down, whoever is handed the keys has some big shoes to fill.

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We should reiterate that the notion of Cook stepping down is pure speculation at this point. We don’t know what Apple’s CEO is currently planning or what his thoughts about retirement may be. That said, there are a handful of contenders who have reportedly been part of the succession conversation. 

Potential Apple CEO replacements

John Ternus, Apple’s current vice president of Hardware Engineering, was top of Gurman’s list. Ternus has been with the tech giant for over two decades, so he has the knowledge and experience for a chief executive upgrade. There would be value in having an engineer behind the wheel. 

Ternus appeared during the September Apple event to introduce the iPhone Air. At 50, he’s the same age Cook was when he took over as Apple CEO.

Other potential contenders are also being considered, including Craig Federighi, Apple’s senior vice president of software engineering; Greg Joswiak, Apple’s senior vice president of worldwide marketing; and Jeff Williams, the company’s former chief operating officer, according to a report by Apple Insider.

Federighi has been with Apple for a long time and has the public speaking experience — frequently speaking during Apple Events — that would be vital if he replaced Cook as CEO. Considering his current role, Joswiak has a more marketing perspective and a broader overview of the company and may not be as hands-on with the tech as Ternus and Federighi. And according to Gurman, Williams was viewed as a shoe-in to be Cook’s replacement until his role as COO ended in July. (He’s now Apple’s senior vice president of design, watch and health.) Cook held the position of chief operating officer before he replaced Jobs as CEO in 2011. Sabih Khan is now in that COO role, which also puts his name in the running.

When Cook steps down, Apple will undoubtedly have a pool of qualified talent to choose from to take up the leadership mantle. Who exactly will take the mantle remains to be seen.

Apple didn’t immediately respond to a request for comment.