Micron Technology briefly crossed the $1 trillion market capitalization threshold on May 26, after an 18% single-day surge triggered by a UBS upgrade. That makes it the third memory chip maker to hit the milestone this month, joining Samsung Electronics and SK Hynix in a club that, until very recently, was reserved for the likes of Apple, Microsoft, and Nvidia.

The numbers behind the memory gold rush

Samsung was first through the door, crossing $1 trillion earlier in May. SK Hynix was close behind, with its market cap estimated between $942B and $966B around mid-May. Then Micron leapfrogged into the club after UBS raised its price target to $1,625, reframing the company not as a cyclical memory stock but as a structural beneficiary of the AI buildout.

SK Hynix has been the most dramatic mover of the three. Its shares have soared more than 200% year-to-date through mid-May, following a 274% increase in 2025. To put that in perspective: if you’d bought $10,000 worth of SK Hynix at the start of 2025, you’d be sitting on roughly $56,000 today.

Together, Samsung, SK Hynix, and Micron control approximately 90% of the global memory chip market.

Why AI turned memory chips into gold

The catalyst is high-bandwidth memory, or HBM. HBM is the technology that sits right next to the GPU and shuttles data at extraordinary speeds. Every AI data center being built by hyperscalers like Microsoft, Google, and Amazon needs massive quantities of it. And there are only three companies on Earth that can manufacture it at scale.

AI developers and cloud providers started locking in long-term supply contracts back in 2025, trying to secure future production capacity before competitors could grab it. The result has been a sustained demand surge that shows no signs of cooling.

UBS made this argument explicitly in its Micron upgrade. The firm’s thesis is that Micron has fundamentally shifted from a company investors evaluate based on memory cycles to one they should evaluate based on its strategic positioning in AI infrastructure.

What this means for investors

Micron’s next quarterly earnings report, scheduled for June 2026, will be a critical data point. Analysts are expected to zero in on production capacity expansion plans and whether the company can actually deliver enough HBM to justify a $1 trillion price tag.

There’s also a geopolitical dimension worth watching. If SK Hynix sustains its trillion-dollar valuation, South Korea would become the first country outside the United States to host multiple trillion-dollar public companies.