How has Apple’s stock performed in the first three weeks of John Ternus’s CEO tenure after succeeding Tim Cook on September 1—particularly its record $345.34 intraday high, brief return above a $5 trillion market capitalization, nearly 9% gain from its $316.85 transition day clos

Apple’s first three weeks under John Ternus have been an emphatically positive market debut: from the $316.85 September 1 close, the $345.34 intraday high implies an 8.99% gain, and Apple briefly reclaimed a $5 trillion valuation. The rally reflects confidence in a potentially stronger iPhone upgrade cycle, but it has also left little room for disappointment.

• What drove the move: Ternus’s September 9 debut introduced the iPhone 18 Pro line and Apple’s first foldable, the iPhone Duo. That gave investors a tangible new premium-product catalyst rather than a leadership transition alone. 2

• Demand evidence is promising, not conclusive: Evercore ISI cited a nearly 4,000-person U.S. consumer survey in raising its target from $365 to $380 while retaining Outperform; 53% of respondents reportedly intended to buy an iPhone 18 Pro. 3 TD Cowen maintained a Buy and a $400 target, representing the more optimistic case that the launch expands Apple’s upgrade cycle. 4 By contrast, published consensus data put the average target near $340 and listed UBS as Hold—evidence that not all analysts believe the launch justifies materially higher valuation from roughly $340-plus levels. 5

• Valuation and the Nvidia comparison: Apple’s approach to $5 trillion has narrowed the gap with Nvidia, estimated around $5.5 trillion. But the fundamental comparison favors Nvidia’s growth: estimates cited Nvidia revenue growth above 80% versus about 14% for Apple. 6 Apple can still temporarily take—or retain—the market-cap lead through its huge installed base, services cash flow, buybacks, and a successful upgrade cycle, but sustaining it would require Apple’s growth and margins to exceed expectations while Nvidia’s AI-infrastructure demand cools.

• Why the stock’s recent strength is fragile: A roughly 32%–34% trailing-12-month gain and a record share price mean the market is already pricing in meaningful iPhone 18 and Duo success. 7 Early demand indicators must translate into unit volumes, premium mix, supply execution, and credible forward guidance—not merely survey intent or initial enthusiasm.

• Earnings catalyst: Late-October fiscal Q4 results have not yet occurred as of September 23, 2026; the reported expected date is October 29. 8 Therefore, there is no evidence yet that those results have “shaped” the outlook. They will be the key validation point: stronger iPhone commentary, durable gross margin, and upbeat December-quarter guidance would support the rally; cautious guidance, weak foldable availability/demand, or softer China performance could rapidly compress the valuation.

Overall, momentum is real, but the case for a lasting Apple lead over Nvidia is not yet established. The bullish case rests on a sustained premium-iPhone replacement cycle; the bearish case is that Apple’s valuation has moved ahead of its comparatively modest revenue-growth profile.