The U.S. chipmaker crossed a historic valuation milestone on Tuesday as a global shortage of AI memory chips pushes the company to the forefront of one of tech’s biggest buildouts.
Micron Technology crossed a landmark threshold on Tuesday, with its shares surging 11% to close at $640.20 pushing the company’s market capitalisation above $700 billion for the first time in its history.
The milestone places Micron among the ten most valuable technology companies in the United States, a position few would have predicted even a year ago.
The stock has now climbed 124% in 2026 alone, adding roughly $395 billion in market value since January.
Over just the last three trading sessions, Micron gained around $133 billion, a pace that reflects just how rapidly Wall Street is repricing the importance of memory chips in the age of artificial intelligence.
Why Memory Chips Are Suddenly Worth So Much
At the heart of the rally is a simple but powerful dynamic: AI systems are extraordinarily hungry for memory.
Training and running large AI models requires moving vast amounts of data at very high speeds.
That puts chipmakers who produce High Bandwidth Memory (HBM) a specialised chip designed for exactly this job in extraordinary demand.
Every AI accelerator built by NVIDIA,AMD, and others requires HBM to function. That makes memory a physical bottleneck in the global AI buildout.
Cloud providers such as Amazon Web Services, Microsoft Azure, and Google Cloud are all racing to expand their AI infrastructure and they cannot do it without chips from companies like Micron.
Micron CEO Sanjay Mehrotra summed it up plainly: “In the AI era, memory has become a strategic asset for our customers, and we are investing in our global manufacturing footprint to support their growing demand.”
Supply Cannot Keep Up With Demand
Micron’s entire HBM supply for 2026 is already fully contracted meaning every chip it can produce this year already has a buyer.
The company stated that it believes industry supply will remain “substantially short” of demand for the foreseeable future.
That shortage is showing up in Micron’s financial results. In its most recent quarter, the company posted revenue of $23.86 billion nearly triple what it earned in the same period a year earlier, and well above Wall Street’s forecast of $19.1 billion.
Gross margins reached a record 68%.
Micron also projects that AI data centres will, for the first time, account for more than 50% of the total global market for DRAM and NAND memory in 2026.
The broader HBM market is expected to grow at roughly 40% per year, reaching an estimated $100 billion by 2028, up from $35 billion in 2025.
Betting Big on Next-Generation Technology
To meet this demand, Micron is spending heavily. The company has committed to capital expenditure of more than $25 billion in fiscal 2026.
It has begun shipping its newest product HBM4 memory in volume, with even more advanced versions already in development for 2027.
Longer term, Micron is building new manufacturing capacity in the United States. A facility in New York is set to break ground in 2026, with chip production expected to begin in 2030.
A packaging plant in Singapore will add to HBM supply from 2027.
Competing Against Industry Giants
Micron is not alone in this market. SK Hynix and Samsung together control the majority of global HBM production, with SK Hynix holding roughly 62% market share.
The South Korean firm has been NVIDIA’s primary HBM supplier and has benefited enormously from the AI boom.
Micron, historically the smallest of the three, has been closing the gap. It has moved quickly to align its product roadmap with NVIDIA’s latest chip platforms and has secured long-term supply agreements that give it reliable revenue visibility well into the future.
The Risks Are Real
Not everyone is convinced the momentum will last indefinitely. The semiconductor industry has a long history of boom-and-bust cycles.
When demand surges, producers invest heavily in new capacity and that new supply can eventually tip the market into oversupply, dragging prices down sharply.
Geopolitical risk is also a factor. Micron has been pushing for tighter U.S. export restrictions on chipmaking equipment to China, citing national security concerns.
Trade tensions could disrupt global supply chains and affect where Micron is able to sell its products.
There is also the question of how long the AI investment wave will continue at its current pace.
While demand today is exceptional, any pullback in spending by major cloud providers could have a rapid knock-on effect on memory sales.
What Comes Next
For now, the outlook remains strongly positive. With its entire 2026 production sold out, Micron is essentially guaranteed strong results for the rest of the year.
Industry analysts expect AI infrastructure spending to continue growing through 2027 and beyond, sustaining demand for advanced memory chips.
The more interesting question is what happens as new manufacturing capacity from all three major suppliers comes online in 2027 and 2028.
Whether AI demand grows fast enough to absorb that additional supply will determine whether Micron’s remarkable run continues or whether the semiconductor cycle turns, as it so often has before.
For now, Tuesday’s milestone is a clear signal of how central memory chips have become to the global technology economy.
What was once a commodity business has, at least for the moment, become one of the most strategically important industries in the world.
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