Apple is set to undergo a leadership change on September 1, with hardware engineering senior vice president John Ternus taking over from Tim Cook. After nearly 15 years at the helm, Cook's impending departure has prompted a look back at the substantial legacy left by the so-called operations mastermind.

The numbers are striking: during Cook's tenure, Apple's market value surged from roughly $350 billion to $4.5 trillion, equivalent to an increase of about $32 million per hour. Meanwhile, the company has repurchased $877 billion worth of shares, making it the largest buyback program in the world.

According to analysis from Yahoo Finance AlphaSpace, Apple's market capitalization stood at approximately $350 billion when Cook took over, and has since climbed to $4.5 trillion. Bank of America analyst Wamsi Mohan calculated that this growth translates to a sustained accumulation of roughly $32 million per hour over nearly 15 years.

"Cook transformed Apple from a company reliant on a few product cycles into an enterprise capable of generating sustained growth, cash flow, customer loyalty, and innovation at enormous scale and SKU complexity," Mohan said.

Historic Buyback Wave: $877 Billion Returned Under Cook

One of the most significant strategic shifts after Cook assumed the CEO role in 2011 was the focus on returning capital to shareholders. He reinstated dividends in 2012 and, more importantly, launched an extensive share repurchase program. Research from The Motley Fool shows that over the past decade, Apple has spent more on stock buybacks than any other company.

During Cook's leadership, Apple's board repeatedly set new records for buyback authorizations: in fiscal 2013, an initial authorization of $10 billion was later increased to $60 billion, marking the largest single buyback authorization at the time; in 2018, a $100 billion authorization was approved; in 2024, an $110 billion authorization became the largest single buyback to date; and in 2025 and 2026, $100 billion was authorized each year. While authorizations do not always equate to actual execution, Apple typically utilizes most of its allowance. To date, Apple has repurchased up to $877 billion in stock under Cook's leadership.

What Do Large-Scale Buybacks Mean for Shareholders?

After repurchasing shares, Apple cancels them. As the number of outstanding shares declines, existing shareholders see their ownership percentage rise. Based on Apple's current market value, a $100 billion buyback authorization represents roughly 2% of the company's shares—a relatively small shift within a single quarter or year. But for long-term investors, the effect is substantial.

When Cook took over, Apple had approximately 26 billion split-adjusted shares outstanding. By July 2026, that figure had dropped to 14.6 billion, a decline of about 44%. This means that a share purchased at the start of Cook's tenure now corresponds to nearly 80% more ownership in the company than it did at the time.

It is worth noting that since Apple initiated its buyback program, its valuation has climbed significantly. For most of the 2010s, Apple's price-to-earnings ratio ranged between 12 and 18 times, whereas its trailing P/E now stands at 36 times. Repurchasing at higher valuation levels means the incremental value created for shareholders is correspondingly reduced.

Ternus's Daunting Task: Protecting the Profit Machine While Restoring Tech Surprise

On April 20, Apple announced that Cook would step down after nearly 15 years, handing the reins to the 51-year-old Ternus. Ternus will officially assume the role on September 1, coinciding with the run-up to key product launches and the year-end holiday shopping season. The last CEO transition at Apple occurred in August 2011, when co-founder Steve Jobs handed the company to Cook.

The Motley Fool suggests this leadership change could signal a shift in strategy. Buybacks will likely remain part of Apple's approach, but new management may redirect some capital toward research and development or acquisitions. Given Apple's current valuation, these paths could serve as stronger growth engines than continued repurchases.

Ternus faces a formidable challenge. Bank of America's Mohan noted: "Apple is already so massive, profitable, and deeply embedded in customers' lives that incremental excellence alone may not be enough to redefine the company. Ternus's challenge lies in preserving the profit machine Cook built while restoring a stronger sense of technological surprise."

Cook himself described Ternus as having "the mind of an engineer, the soul of an innovator, and the heart to lead with integrity and honor." These qualities will be key to ensuring Apple's continued success in the era of artificial intelligence.