Apple Rally Fueled by AI Promises Approaches a Crucial Test

Apple Inc.’s upcoming iPhone release has sent its stock price soaring because of promised artificial-intelligence features. Those gains appear vulnerable, at least in the short term, if history is any guide.

The company’s stock typically underperforms after iPhone launches, a cautious precedent when expectations are sky-high and Apple’s share price relative to earnings is quite rich — leaving little room for error.

Apple shares have dropped on 12 of the 17 iPhone launch days, according to data compiled by Bloomberg. Also, September has been the worst month for Apple shares over the past decade, falling an average of 3.2% during that time. That tracks a broader trend, as both the S&P 500 Index and the Dow Jones Industrial Average also experience their their biggest percentage losses in the month, according to the Stock Trader’s Almanac.

If the newest iPhone does not live up to expectations in terms of product features or sales, Apple could see a repeat of those valuation doldrums.

“You can easily envision a scenario where the market has built up all this enthusiasm, but then it has to bide time before we get concrete evidence Apple’s AI strategy is working,” said Denny Fish, who manages the $7 billion Janus Henderson Global Technology and Innovation Fund. “While there’s a desire for AI features, there’s room for skepticism and the multiple is at the high end,” he added. “That’s generally not a great time to buy.”

Shares fell 0.3% on Tuesday.

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The company will hold a product announcement event on Sept. 9. Bloomberg News recently reported that the latest phones will go on sale Sept. 20, though the AI features won’t be rolled out until October, through software updates.

Apple shares have risen 39% off an April low, as of their last close. The move has added more than $900 billion to its market capitalization and contributed 22.6% of the Nasdaq 100 Index’s total gain over that period, more than any other component, according to Bloomberg data.

Apple’s stock is valued at 31 times estimated earnings, more than a 50% premium to its 10-year average multiple. Last month the revenue multiple touched 8.8, its highest going back to at least 2000.

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