Qualcomm heads into its fiscal fourth-quarter report with a stock that has run well ahead of its fundamentals. Shares have climbed 22.6% since the last report while the S&P 500 gained 4%, even though management used that call to cut near-term expectations, warn of margin compression and say its Apple business is unwinding faster than planned. The market has bought the long-term diversification story. This report is the first real test of whether that faith was justified, and the most important numbers may be in the December-quarter guidance rather than the September results.

Wall Street expects non-GAAP earnings of $2.16 per share on revenue of $10.15 billion, which would be a decline of almost 10% from the $11.27 billion reported a year ago and a drop from the $2.56 in EPS earned in the same quarter last year. That is plainly a contraction quarter. Analysts have already done their adjustment. Before the last report, consensus sat at $2.35, above management's eventual range of $2.05 to $2.25 on revenue of $9.70 billion to $10.50 billion. Estimates have since fallen to land almost exactly at the midpoint. The Earnings Whisper of $2.19 is only slightly above consensus, which suggests the market expects a modest beat but is not demanding a dramatic one. Clearing the bar for the quarter itself looks reasonable. The harder question is what comes next.

The core handset business has been shrinking steadily. QCT handset revenue fell from $7.8 billion in the December quarter to $6.0 billion and then $5.1 billion, as unusually high memory prices pushed down the size of the whole smartphone market. Management now expects the handset market to fall by low teens this fiscal year, with QCT Android revenue down about 20%. Margins have weakened along with it. QCT pretax margin slid from 31% to 26% over three quarters and was guided to just 23% to 25% for this period, with gross margin expected to dip slightly below the historical 48% to 50% range because of input-cost inflation and a weaker premium mix. A margin at the top of that range would suggest cost pressure has stabilized. A margin at the bottom would signal that memory and packaging inflation is still running ahead of the company's pricing power.

Apple is the overhang that matters most for the outlook. Last quarter, management said its share of the next iPhone would be materially below the 20% it had assumed for several quarters, and it expects Apple revenue to fall roughly 50% from September to December. The December guide therefore carries a known hole. The question is how much of it the new businesses can fill. Two custom-silicon hyperscaler wins are scheduled to start generating revenue in the December quarter, with purchase orders received and wafers already in production. Management has set data center targets of $5 billion in fiscal 2027 and $15 billion in fiscal 2029, and doubled its fiscal 2029 non-handset goal to more than $40 billion. Any sign that those ramps are on time, along with clarity on the 1.5 to 2 point gross-margin drag that this early revenue will carry, would strongly support the bull case.

Automotive is the cleanest evidence available right now. Revenue reached a record $1.6 billion, up 61%, and management raised its fiscal 2026 exit run-rate to about $7 billion, which implies roughly $1.75 billion a quarter. Reaching that level would show the BMW and Stellantis momentum is real, and it would give credibility to the claim that non-handset revenue can grow more than 60% next year and fully replace Apple.

Sentiment has improved to modestly bearish from distinctly bearish a quarter ago, which matches the stock's rally. Shares trade at $179.60, above the 200-day moving average of $169.38 but still about 13% below the post-earnings high of $205.85, and far below the prior quarter's peak near $260. That leaves room for upside if the story holds, but the recent gains show the market has already credited part of it. In the end, the report will be judged by whether data center and auto growth look strong enough to bridge the Apple decline. If management reaffirms the fiscal 2027 targets and gives a December outlook that limits the Apple damage, the diversification story survives. A vague answer on that point would be hard for this rally to absorb.