Micron Technology just did something it’s never done before. The memory chipmaker’s stock closed with a market capitalization exceeding $1 trillion on May 26, making it only the second memory chip company, alongside Samsung, to hit that landmark valuation.

Shares surged as much as 19% intraday to approximately $891, driven by a UBS upgrade so aggressive it practically broke the analysts’ keyboards. The firm nearly tripled its price target for Micron from $535 to $1,625, the highest target on all of Wall Street.

What’s behind the trillion-dollar pop

UBS’s upgrade centered on the explosive demand for high-bandwidth memory, or HBM, the specialized chips that power the AI accelerators inside data centers. Micron’s HBM capacity is sold out through the end of 2026.

Micron’s HBM revenue approached nearly $2 billion in its most recent quarter, a figure that reflects the company’s aggressive ramp-up of its HBM3E products and the approaching rollout of HBM4. Long-term supply agreements with major AI infrastructure buyers have essentially locked in revenue streams that analysts like those at UBS believe will compound meaningfully.

Joining an exclusive club

Crossing $1 trillion in market value puts Micron in rarefied air. The company now sits alongside Nvidia, Apple, Microsoft, and a small handful of others that have reached this threshold.

Year-to-date, Micron’s stock performance has ranged from 40% to 208% depending on the starting point, a reflection of just how dramatically investor sentiment has shifted toward memory as an AI play.

What this means for investors

Micron’s position is enviable but not without risk. The HBM market is attracting serious competition from SK Hynix and Samsung, both of which are investing heavily in next-generation memory products.

UBS’s $1,625 target implies nearly double the current share price. Samsung and SK Hynix are both accelerating their HBM4 development timelines, and any shift in technology leadership could reshuffle market share quickly. Micron’s ability to maintain its sold-out status through 2026 and beyond will be the key metric to track in coming earnings reports.