A $400 billion after-hours rally followed a bruising sell-off weeks earlier, capturing the bipolar mood of AI chip investors in one earnings cycle
The semiconductor sector just lived through a mood swing that would make a therapist reach for their notepad. In the span of three weeks, chip stocks went from a punishing sell-off to a euphoric rally that added over $400 billion in market value during after-hours trading. The catalysts: Micron Technology and Qualcomm, whose late-June earnings reports reminded Wall Street that the AI trade is very much alive, even if it occasionally gives investors heart palpitations.
Micron’s fiscal Q3 results were the kind of numbers that make analysts spill their coffee. Revenue surged 346% year-over-year and 74% sequentially, sending shares up roughly 15-17% in extended trading. Qualcomm, not to be outdone, dropped a long-term forecast that projected $15 billion in data-center revenue by fiscal 2029, while raising its overall non-handset revenue target to $40 billion by the same year.
From sell-off to surge in three weeks #
On June 4, 2026, the sector got hammered. Micron dropped more than 7%. Qualcomm fell approximately 2%. The culprit was a growing concern that AI valuations had gotten ahead of themselves.
The after-hours reaction was dramatic. The chip sector collectively added over $400 billion in market value in a single trading session after the closing bell.
The AI trade is broadening, and that matters #
Micron’s blowout results signal that memory chips are becoming a critical bottleneck and profit center in AI infrastructure. Analysts have recognized a widening demand for AI technologies beyond GPUs and a strengthened pricing capacity in memory products.
Qualcomm’s $15 billion data-center revenue target by 2029 represents a significant pivot for a company historically known for smartphone modems. The two companies are also partnered to supply LPDDR5X memory for Qualcomm’s Snapdragon platforms, specifically designed to enhance edge AI capabilities. Qualcomm raising its non-handset revenue target to $40 billion by fiscal 2029 signals the company is no longer positioning itself primarily as a phone chip company.
What this means for investors #
Micron losing more than 7% in a single session on June 4, only to gain 15-17% a few weeks later after reporting 346% year-over-year revenue growth, reflects a market that is willing to lurch in either direction on new information.
If Qualcomm successfully executes its data-center and edge AI strategy, a $40 billion non-handset revenue target by 2029 would fundamentally reshape how the market values the stock. The Micron-Qualcomm partnership on LPDDR5X memory for Snapdragon platforms hints at a vertical integration trend in AI hardware. Companies that control both the processing and memory layers of AI workloads may have pricing advantages that pure-play chipmakers can’t match.
Investors should watch quarterly capex guidance from major cloud providers as a leading indicator of whether AI infrastructure spending continues, given that the current wave of AI infrastructure investment is one of the largest in history.
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