Micron and SK Hynix Join Samsung in the Trillion-Dollar Club as AI Memory Supercycle Reshapes Semiconductor Valuations

Overview

In the span of a few weeks, all three of the world’s major memory chipmakers crossed the $1 trillion market capitalization threshold — a milestone that would have seemed implausible eighteen months ago, when Micron Technology traded at under $100 per share. On May 26, 2026, Micron’s stock surged 19.29% to $895.88, carrying its market cap past $1 trillion for the first time in the company’s history, according to Yahoo Finance. The following day, SK hynix joined the club, with its shares climbing 11.30% to 2.286 million won, pushing its market capitalization to approximately 1,500 trillion won — roughly $1 trillion — per the Seoul Economic Daily. Samsung Electronics, which had crossed the threshold earlier in May, simultaneously saw its combined market cap surpass 2,000 trillion won.

The common thread is high-bandwidth memory. HBM chips, essential for the AI accelerators powering data center buildouts from Virginia to Singapore, have moved from a niche product line into the bottleneck component of the global technology supply chain — and the three companies that make them are the only ones equipped to fill the gap.

What We Know

The UBS upgrade that catalyzed Micron’s surge. The immediate trigger for Micron’s record single-day gain — its best performance since 2011, according to Yahoo Finance — was a sweeping upgrade from UBS analyst Timothy Arcuri, who raised his price target from $535 to $1,625, a 204% increase that put his estimate at the highest on Wall Street, as reported by The Tech Marketer. The $1,625 target implies a potential market capitalization of approximately $1.8 trillion, which would rank Micron seventh among all US public companies by market value, according to Yahoo Finance.

In his note, Arcuri argued that the memory market’s structural transformation justifies a fundamental repricing of Micron’s stock. “We believe the market will start to put a more ‘normal’ multiple on the stock and MU will continue to re-rate higher as more details emerge about the structural changes AI has driven to the entire memory complex,” Arcuri wrote, as quoted by American Bazaar Online. He went further in a separate statement captured by The Tech Marketer, arguing there is “no reason why MU should trade a whole lot differently than NVDA in terms of P/E” — a comparison that would represent a massive re-rating for a sector historically treated as cyclical.

In a separate downside scenario, Arcuri noted the stock could fall to $250 if high-bandwidth memory demand weakens, according to The Motley Fool.

Micron’s financial results support the valuation shift. The upgrade did not emerge from speculation alone. Micron’s most recent quarterly results were transformational by any historical measure. The company reported Q2 fiscal 2026 revenue of $23.9 billion, a 196% year-over-year increase and 28% above its own guidance of $18.7 billion, according to The Tech Marketer. Earnings per share reached $12.07, a 756% increase from the prior year. Gross margin reached 74.4%, more than doubling from below 20% in 2023, as reported by Blockonomi.

For Q3 fiscal 2026, Micron guided to revenue of $33.5 billion — a further 260% year-over-year increase — with gross margins expected to exceed 81% and EPS projected at $19.15, against a consensus estimate of $12.05, per Blockonomi. Cloud memory revenue alone reached $7.7 billion in Q2, up 163% year over year, according to The Tech Marketer.

HBM4 entirely sold out under long-term contracts. Micron CEO Sanjay Mehrotra confirmed that the company’s entire 2026 HBM4 supply is “sold out under long-term, fixed-price contracts,” as reported by The Tech Marketer. Even at capacity, Micron can fulfill only 50-65% of its key customers’ medium-term demand. SK hynix similarly secured demand for its entire 2026 HBM production in October 2025, according to NAND Research.

The supply squeeze extends across the broader memory market. Goldman Sachs characterizes the current deficits as “the most severe in 15 years,” with a global DRAM deficit of 4.9% in 2026, a NAND deficit of 4.2%, and an HBM deficit of 5.1%, per NAND Research. DRAM lead times have “extended beyond 40 weeks, with some configurations approaching six months.” New capacity is not expected before late 2027 at the earliest, with 2028 as the base case.

SK hynix crosses $1 trillion on May 27. On the day after Micron’s milestone, SK hynix became the second Korean company to join the $1 trillion club, per the Seoul Economic Daily. Its shares rose 11.30% to 2.286 million won. Simultaneously, Samsung Electronics’ combined market cap — common and preferred shares together — surpassed 2,000 trillion won, with common shares at 1,847 trillion won and preferred shares at 156.6 trillion won.

Kim Young-gun, an analyst at Mirae Asset Securities, raised his price target for Samsung from 480,000 won to 550,000 won and for SK hynix from 3.2 million won to 3.8 million won on May 27. “In line with the broader valuation uptrend across the global memory sector, we changed the applied 12-month forward EV/EBITDA multiple from 6x to 7x,” Kim wrote, according to the Seoul Economic Daily. On Samsung’s position, he added: “With its maximum production capacity in DRAM and NAND, Samsung can enjoy the greatest operating leverage during the semiconductor super-cycle, and the performance and yields of its most advanced products, high-bandwidth memory (HBM) 4 and SOCAMM2, are recovering.”

Kim also projected that higher memory prices and an expanded share of long-term agreements “will lift the average return on equity (ROE) to 66 percent between 2026 and 2028.”

The broader memory market is undergoing structural change. Memory spending now comprises about 30% of hyperscaler capital expenditure in 2026, up from 8% in 2024, according to NAND Research. The five largest cloud providers are projected to spend $755 billion on capital expenditures in 2026, an 83% year-over-year increase, with memory products accounting for a growing share. Samsung and SK hynix together control approximately 70% of global DRAM production; Samsung, Micron, and SK hynix together control a combined 62.9% of the NAND flash market.

DRAM contract prices rose 58-63% in recent quarters, while NAND flash prices are climbing 70-75%, outpacing DRAM for the first time in the current cycle, as reported by The Tech Marketer. The HBM market itself is projected to grow from $35 billion in 2025 to $100 billion annually by 2028.

Micron’s stock at the time of the milestone had risen approximately 14-fold over twelve months, according to Blockonomi, making it the newest member of the trillion-dollar club alongside Apple, Microsoft, Nvidia, Alphabet, Amazon, Meta, and Tesla. As of the milestone, 39 of 44 analysts covering Micron rated the stock Buy or higher, per The Tech Marketer.

Micron is also expanding its manufacturing footprint. The company has announced plans for a second facility at the Tongluo site in Taiwan, acquired from Powerchip Semiconductor Manufacturing Corporation earlier this year, to expand HBM supply, as reported by American Bazaar Online. Meanwhile, its Manassas, Virginia facility has begun producing 1-alpha DRAM — described as “the most advanced memory ever produced in the United States” — according to The Tech Marketer.

What We Don’t Know

Whether the current valuation levels are sustainable depends heavily on HBM demand remaining at elevated levels and the long-term contract structure holding. Arcuri’s own note acknowledges a downside scenario: if HBM demand weakens, Micron could fall to $250 per share, per The Motley Fool — a nearly 70% decline from today’s price. The current shortage is being driven in part by the unprecedented pace of hyperscaler AI capex; whether that pace is maintained, accelerated, or corrected remains unclear.

Samsung’s recovery in HBM4 and SOCAMM2 yield rates, referenced by Mirae Asset’s Kim Young-gun, has not been independently verified or quantified with specific metrics. And the timeline for new memory capacity — which NAND Research places no earlier than late 2027 — remains subject to both capital allocation decisions and the pace of AI infrastructure buildout.

As previously reported, SK hynix held roughly 53% of the overall HBM market in Q3 2025 and has secured roughly two-thirds of NVIDIA’s initial HBM4 orders. The competitive balance between the three chipmakers within the HBM segment — particularly as Samsung works to close the gap — will shape which company benefits most from the next wave of demand.

Analysis

The simultaneous entry of all three major memory chipmakers into the trillion-dollar club represents a structural inflection point. For most of the semiconductor industry’s history, memory has been treated as a commodity business — subject to brutal cyclical swings, characterized by chronic oversupply, and valued accordingly. The current AI infrastructure buildout is inverting that model.

Long-term supply agreements with fixed pricing — the mechanism Arcuri cited as justification for comparing Micron’s P/E to Nvidia’s — change the earnings visibility equation. If hyperscalers are willing to commit to multi-year contracts to guarantee HBM supply, memory producers gain the kind of revenue predictability that markets have historically assigned to software or platform businesses. Whether that visibility endures beyond the current AI investment cycle is the central question facing all three companies.