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Samsung Electronics, Micron Technology, and SK Hynix have all crossed the $1 trillion market capitalization mark in May 2026, powered by an insatiable appetite for high-bandwidth memory chips that fuel AI data centers. Their combined valuation now sits at roughly $3 trillion.
Three companies, one very good month
Samsung got there first. The world’s largest memory chipmaker surpassed the $1 trillion threshold earlier in May.
Micron followed on May 26, and it did so in dramatic fashion. Shares surged 18-19% in a single session after UBS upgraded its price target to a record $1,625. UBS more than tripled its previous target.
SK Hynix rounded out the trio on May 27 with a 9.3% jump in its stock price. The South Korean chipmaker’s shares have climbed over 1,000% in the past year and more than 200% year-to-date.
Why memory suddenly matters this much
High-bandwidth memory, or HBM, stacks memory chips vertically and connects them with ultra-fast links, allowing data to flow to AI accelerators at speeds that traditional memory can’t match.
Demand for HBM has been so intense that Micron has sold out its entire supply for 2026. Every chip they can produce this year already has a buyer.
What this means for investors
Samsung, SK Hynix, and Micron collectively dominate global memory production with no meaningful fourth player in this market. When UBS triples a price target, that’s a firm betting the growth story has legs.
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