SK Hynix Became South Korea's Most Valuable Listed Company

On June 22, SK Hynix overtook Samsung Electronics to become South Korea's most valuable listed company — the first leadership change at the top of Korean markets since Samsung took the crown in 2000. The KOSPI closed at a record 9,114.60. SK Hynix rose 5.6% to an all-time high. Samsung edged lower. The AI boom did not just lift chip stocks. It rewrote which company defines an entire national market.

The flip: Reuters put SK Hynix's market cap at 2,082.5 trillion won ($1.35 trillion) versus Samsung's 2,081.3 trillion won on common shares. Chosun Biz reported the same crossover on a common-share basis — 2,068 trillion won against 2,060 trillion — the first time Samsung has ceded the bellwether seat in a generation. Samsung argues preferred shares keep it larger overall at roughly 2,252 trillion won. The market disagrees on what matters: pure memory exposure beat the conglomerate.

Why Hynix won: SK Hynix is not a diversified electronics empire. It makes memory — and memory is now the choke point inside every AI server. High-bandwidth memory chips sit beside Nvidia GPUs and Google TPUs; they are custom-integrated, hard to swap, and priced accordingly. Analysts credit SK Hynix with 61% of the global HBM market in 2025 versus Samsung's 17% and Micron's 21%, per Reuters. Shares are up more than 340% this year. Kim Sunwoo, a senior analyst at Meritz Securities, told Reuters: "The emergence of customised AI memory fundamentally changed the industry's economics and allowed SK Hynix to establish itself as the market leader." SK Group Chairman Chey Tae-won put it more bluntly in a January book excerpt Reuters cited: "What used to be a peripheral component has become a core component."

The leverage bomb: Asia is not just buying the rally — it is amplifying it. Benzinga reported Sunday that Hong Kong's CSOP SK Hynix Daily (2x) Leveraged Product has grown to $13 billion in assets, becoming the city's second-largest ETF. Assets more than tripled in two months. The fund accounts for roughly 13% of Hong Kong's entire ETF market less than eight months after launch — the fastest growth recorded for an Asian ETF. South Korea's benchmark is up about 111% year-to-date, per Benzinga. Japan's Nikkei crossed 72,000 for the first time the same morning, with Prime Minister Sanae Takaichi's government targeting 370 trillion yen ($2.29 trillion) in public and private AI and chip investment by 2040, Reuters reported. Nomura strategist Wataru Akiyama told Reuters: "AI-related companies are once again playing a leading role in driving the market."

Who's buying, who's selling: Chosun Biz reported Korean retail investors were net buyers of more than 3 trillion won in KOSPI stocks on June 22 while foreigners sold more than 3.4 trillion won and public pension funds dumped over 180 billion won. That is not a foreign-institution-led boom. It is a domestic concentration bet on two names — SK Hynix and SK Square, which surged 8.9% — while Hyundai Motor, LG Energy Solution, and most other top-cap stocks fell. Korea Customs data showed exports for June 1–20 hit another record, driven by semiconductors. The same day, OpenAI announced it will supply ChatGPT Enterprise and Codex to Samsung globally — a reminder that even the dethroned king still needs the models Hynix's chips are built to serve.

The turnaround nobody priced: Two decades ago Hynix was a penny stock drowning in debt, nearly sold to Micron. In 2023 it posted a 7.73 trillion won operating loss. In 2024 it earned a record 23.5 trillion won as hyperscalers locked in HBM supply. Bank of America estimates SK Hynix will narrow Samsung's DRAM wafer output gap from 23% to under 10% by 2028. Reuters has reported SK Hynix is leaning toward a Nasdaq listing to widen its investor base. The company that almost died on commodity cycles is now the asset foreigners are exiting while locals pile in with leverage.

What to watch:

• SK Hynix's Nasdaq ADR decision — a U.S. listing would globalize the HBM trade further
• Samsung's HBM share recovery efforts and whether logic-chip and phone divisions drag the stock
• Hong Kong's 2x leveraged Hynix ETF — record inflows are a sentiment indicator and a fragility risk
• Whether foreign net selling on June 22 marks profit-taking or the start of a rotation out

Convina's view: Wall Street spent two years bidding up Nvidia and the hyperscalers. Asia just sent the bill to a different address. SK Hynix's coronation is the equity market admitting what RAMageddon already proved in hardware: the scarcest asset in the AI stack is specialized memory, and the companies that own it set the terms. Samsung is still a giant — but giants that make everything are losing to specialists that make the one thing nothing runs without. Treat this as a market-structure signal, not a Korea-only curiosity. If your AI thesis stops at U.S. cloud capex, you are missing where pricing power and retail euphoria are actually concentrating — and where a 2x leveraged ETF now holds 13% of an entire city's ETF market. Memory owns the bottleneck. The bottleneck now owns the crown.