Micron Stock: AI Boom or Memory Glut Ahead?

Micron Technology (MU) has been one of the best-performing stocks of the past five years, turning a $10,000 investment into over $148,300. This staggering 138,000% return was driven by the company's rapidly rising revenue and profits amid insatiable demand for artificial intelligence (AI) infrastructure.

The company's fiscal fourth-quarter earnings were nothing short of spectacular. Revenue soared 379% year over year to $54.2 billion, driven by high sales to data center and cloud computing clients. As AI accelerators become more powerful, memory has emerged as a critical bottleneck, leading to soaring demand for specialty products like high-bandwidth memory (HBM).

HBM is distinct from conventional DRAM because of its significantly higher performance. These chips are typically paired with graphics processing units (GPUs) and other AI accelerators, moving massive amounts of data quickly and efficiently within a data center. As companies like Micron commit more production capacity to HBM, shortages have emerged throughout the memory market.

This trend is exemplified by Micron's Mobile and Client segment, which supplies lower-end chips for smartphones and laptops. This once-mature business saw its Q4 growth skyrocket 248% year over year to $13.1 billion, mainly because clients are willing to pay more for these products than they were in the past. Higher-margin sales helped drive fiscal 2026 net income to $86.8 million, an eye-popping 816% jump compared to the prior year.

Despite the impressive growth, Micron's stock trades at just 7 times forward earnings, a low valuation that should set off alarm bells. Clearly, many on Wall Street don't expect the boom to last very long. The biggest warning comes from history: the memory industry has a long track record of boom and bust cycles, including the PC boom during the 90s and the smartphone boom during the late 2010s.

These booms typically start with demand outstripping supply and end with a market glut as production capacity catches up. Bulls argue that this time will be different because of long-term purchasing contracts and the sheer importance of the new AI industry, but that's a risky bet. Over the next few years, a massive amount of HBM supply is expected to hit the market.

Micron itself plans to pour $250 billion into U.S. manufacturing capacity through 2035. Not only will this dramatically increase the amount of memory available, but it will also soak up a lot of the company's cash flow that could have otherwise gone to dividends and buybacks. China is another long-term threat, as new entrants like CXMT plan to scale up their production over the next few years.

Whether Micron stock is a good buy in October depends on what you expect to happen in the AI industry. If you think the AI boom is just getting started and that current levels of data center spending will continue to rise, the stock will look like a great buy because its low valuation reflects a slowdown you don't believe will happen. However, based on historical patterns in the memory industry and Micron's own huge investments into production capacity, the risk of a future glut seems to outweigh the potential rewards right now. And the stock will probably continue trading sideways until more information becomes available.