SK Hynix Defends AI Memory Crown with Cooling Tech and a $65 Billion Alliance as Samsung Narrows the Gap

SK Hynix hits 52-week high after 244% YTD gain, fueled by AI partnerships, record Q1 profit, and HBM dominance. Samsung fights back with HBM4E samples.

SK Hynix enters June riding a wave that few semiconductor stocks have ever surfed. The South Korean memory giant’s shares closed Friday at 2,333,000 won — a fresh 52-week high — after a week that delivered both a strategic milestone and a clear competitive signal from its archrival Samsung.

The stock has climbed 244.61 percent since the start of the year and 80.43 percent over the past 30 days alone. Friday’s session added 1.92 percent, bringing the weekly gain to 20.20 percent. The rally has stretched valuations to a point where the distance to the 50-day moving average sits at 72.12 percent, with the relative strength index at 68.9 — a reading that suggests strong demand but leaves little room for disappointment.

Behind the price action lies a dual narrative: one of deepening ties to the artificial intelligence ecosystem and another of intensifying technological competition.

The $65 Billion Bet That Locks In AI Supply Lines

On May 30, SK Hynix joined a group of investors in Anthropic’s Series H round, a $65 billion fundraising that valued the Claude chatbot developer at $965 billion. That marks the first time Anthropic has surpassed its rival OpenAI, which was last valued at $852 billion.

The arrangement grants SK Hynix the title of “strategic infrastructure partner” — a status it shares with Samsung and Micron. The label signals more than a financial stake; it secures preferred supplier access to an ecosystem generating annualized revenue of over $47 billion. For a memory maker whose HBM chips are already the backbone of Nvidia’s AI accelerators, the Anthropic tie-up locks in demand visibility well beyond the current cycle.

Record Profit Fuels a Trillion-Dollar Valuation

The fundamental engine powering this rally is a net profit of 40 trillion won in the first quarter of 2026 — a 400 percent surge from the prior year. Analysts at KB Securities and Mirae Asset Securities have responded by lifting their price targets to 3.8 million won each. Mirae’s Kim Young-gun points to a structural supply deficit in the memory market that industry experts expect to persist until at least 2028.

SK Hynix’s market capitalisation has swelled to the equivalent of 93.2 percent of Samsung Electronics — a ratio that would have seemed fanciful just a few quarters ago. The company now controls between 57 and 58 percent of the high-bandwidth memory market, comfortably ahead of Samsung at 22 percent and Micron at 21 percent, according to Counterpoint Research.

Samsung Moves Early with HBM4E Samples

That dominance is not going unchallenged. Samsung announced Friday that it had begun shipping samples of its HBM4E chip, a 12-layer device that delivers more than 20 percent higher speed than its HBM4 predecessor. The part combines sixth-generation 10-nanometer DRAM with a logic base die built on Samsung’s 4-nanometer process.

Early sampling is crucial in the HBM business because hyperscale customers lock in their supply chains long before mass production ramps. Jeff Kim, head of KB Securities-Jefferies research, notes that suppliers who achieve early qualification often capture the bulk of subsequent orders. A successful HBM4E qualification by Samsung could therefore shift the balance of volume allocation.

The market did not interpret the news as an immediate threat to SK Hynix. The stock rose on Friday, and the immediate technical picture offers clear levels: support at 2,290,500 won, resistance at 2,379,000.

Cooling Innovation as a Counter-Move

SK Hynix unveiled its own technology response in the same week with the introduction of iHBM, a solution that integrates cooling elements directly into the HBM package. The approach tackles one of the most pressing challenges in AI chip design: as memory stacks grow taller and denser, heat dissipation at the interface between HBM and the GPU becomes a bottleneck.

The company claims the integrated cooling elements, built on its proven MR-MUF technology, reduce thermal resistance by 30 percent. The solution is slated for deployment from the eighth HBM generation, HBM5, and could reinforce SK Hynix’s edge in high-performance packaging and system-level thermal management.

What Comes Next

The competitive narrative is shifting from pure scarcity to a battle of speed, qualification timelines, and engineering ingenuity. Samsung’s aggressive HBM4E sampling puts pressure on SK Hynix to maintain its leading position through both process technology and system-level innovations like iHBM.

Meanwhile, SK Hynix is evaluating a potential US initial public offering to broaden its visibility in the global AI boom. The next concrete date on the calendar for South Korean equity markets is June 3, when exchanges close for local elections.

For investors, the next major catalysts will come from customer qualification announcements and volume allocations for HBM4E. If SK Hynix holds its position at the top of the supply chain, the re-rating continues. If Samsung recaptures meaningful qualification wins, the stock will face its first real competitive test since the start of this historic run.