SK Hynix Joins the Trillion-Dollar Club, But Samsung’s HBM4E Gambit Looms Ahead

SK Hynix becomes second Korean firm to reach $1 trillion market cap, but Samsung's early HBM4E sample shipment signals intensifying competition in AI memory.

South Korea’s memory-chip champion crossed a historic threshold this week, but the celebration came with a warning from its biggest rival. SK Hynix became just the second Korean company after Samsung Electronics to breach the $1 trillion market capitalisation mark, finishing Friday at 2,333,000 won per share — a 244.6% gain since the start of the year. The rally, fuelled by insatiable demand for its high-bandwidth memory (HBM) chips used in Nvidia’s AI processors, lifted its market value to roughly $1.1 trillion. Yet on the same day the stock hit a new 52-week high, Samsung announced it had shipped samples of its next-generation HBM4E chips to key customers, signalling that the battle for the next cycle of AI memory is already under way.

Samsung’s move shifts the spotlight from SK Hynix’s current dominance to the looming technology transition. The 12-layer HBM4E samples offer speeds of up to 16 gigabits per second and a bandwidth of 3.6 terabytes per second per stack — a 20% improvement over the preceding HBM4 generation. Mass production will begin after customer qualification, though no timeline for volume deliveries has been set. SK Hynix, by contrast, plans to deliver its own HBM4E samples only in the second half of 2026, with mass production slated for 2027. Samsung therefore appears ahead on the calendar, but a sample shipment is not yet a qualified product, let alone a reliable revenue stream.

For now, SK Hynix commands the battlefield. In the fourth quarter of 2025 it held 57% of the global HBM market by revenue, according to Counterpoint Research, while Samsung captured just 22% and Micron 21%. That pricing power is visible in the financials: first-quarter 2026 revenue more than quadrupled to 52.6 trillion won ($34.8 billion), and operating profit surged 400% year-over-year to 37.6 trillion won, yielding a staggering 72% operating margin. The company’s HBM output is sold out through 2026, and analysts expect supply constraints to persist at least until 2027. Speculation about a possible U.S. ADR listing later this year has added to the momentum.

The market cap milestone underscores how drastically the pecking order has changed. A year ago SK Hynix was worth less than half as much as Samsung. Today it stands at 93.2% of its larger rival’s valuation — a gap of just 6.8%. Only four of the roughly 14 companies worldwide with a trillion-dollar market cap are headquartered outside the United States; SK Hynix is now one of them.

Yet the real test lies ahead. Samsung’s early HBM4E sample shipment sets a visible reference point for performance benchmarks in bandwidth, energy efficiency and thermal management. If SK Hynix’s later samples fail to meet the exacting standards of AI chip designers, the pricing leverage that underpins its stunning margins could erode quickly. The stock’s 52-week high, reached Thursday at 2,320,000 won before pushing higher on Friday, already prices in a seamless extension of HBM dominance. Whether SK Hynix can carry its current strength into the next technological generation will determine whether the trillion-dollar label sticks — or becomes just a temporary peak in a fiercely competitive memory landscape.