A famous trader recently signaled caution on Micron (MU) stock after its breathtaking surge. On May 6, 2026, Mark Minervini announced he sold his shares, calling the stock's recent price action a “climactic” run-up that could lead to a sharp pullback.
The context for his warning is a near-vertical price chart. In just six trading days, Micron stock soared nearly 29%, capping a year-to-date gain of over 120%. This kind of explosive move often makes experienced traders wary of a short-term exhaustion point, even if the long-term story is positive. So, what fueled this incredible rally?
The recent surge wasn't caused by a single event but rather a cascade of positive news over the past several weeks, all pointing to a 'super-cycle' in the AI and memory chip markets. We can trace the causes backward.
First, the most immediate catalysts were announcements from hyperscalers. In late April, both Meta and Alphabet significantly increased their capital expenditure (capex) forecasts for 2026, signaling a massive ramp-up in spending on AI infrastructure. This directly translates to more demand for high-performance memory chips like Micron's High Bandwidth Memory (HBM), which are essential for training and running AI models. This news, combined with strong outlooks from semiconductor equipment makers like ASML and TSMC, confirmed that the AI spending boom was real and accelerating.
Second, the memory market's own dynamics provided a powerful tailwind. Industry reports from TrendForce had been flagging dramatic price increases for DRAM chips throughout the first half of 2026. Suppliers were shifting production to more profitable HBM chips, creating a shortage and driving up prices for conventional memory. This was confirmed when Micron reported blockbuster earnings in March, smashing estimates and guiding for record-breaking revenue in the next quarter. This turned the theoretical 'super-cycle' into a reality reflected in hard numbers.
Third, long-term visibility for AI demand was solidified. At NVIDIA's GTC conference in March, the company unveiled its next-generation AI platform, 'Vera Rubin', which will use the even more advanced HBM4 memory. This assured investors that the demand for high-end memory wasn't a short-term fad but a multi-year technology roadmap, with Micron positioned as a key supplier. All these factors combined to create a perfect storm, culminating in the price climax Minervini identified.
- HBM (High Bandwidth Memory): A type of high-performance memory chip essential for powerful AI processors. It stacks memory dies vertically to achieve much faster data transfer speeds than conventional memory.
- Capex (Capital Expenditure): Funds used by a company to acquire, upgrade, and maintain physical assets such as property, plants, buildings, technology, or equipment. In this context, it refers to spending on data centers and AI servers.
- Hyperscaler: A term for a large-scale cloud service provider that can offer massive computing resources. Examples include Amazon Web Services (AWS), Google Cloud, and Microsoft Azure.