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SK Hynix in the US stock market (SKHY) deep dive: storms and dawn atop the HBM throne

If we’re talking about the hottest US stocks recently, it’s SK Hynix. With the Korean market’s much-loved limit-up and limit-down trading halts, SK Hynix has also seen massive fluctuations. The US-listed shares of Hynix—also newly listed on Nasdaq—have moved sharply in tandem. Today, Little Lucky Money will break down SK Hynix’s stock price action:

I. Current trading: a tale of ice and fire on the board

On July 17, 2026, SK Hynix’s US stock ADR (NASDAQ: SKHY) once again played out a nerve-wracking “roller-coaster” plot. Before the open, it dropped nearly 4%, then strongly rebounded and surged more than 2%. During the session, it kept pulling back and forth. The latest quote is about $146.87, down about 3.6% from the previous trading day’s close of $152.31. Since SKHY listed on Nasdaq on July 10 at the $149 issue price, it has been like a runaway horse: up 12.76% on day one to $168.01; it even surged to an all-time high of $194.80 on July 14; then on July 16 it suffered a single-day plunge of 13.69% to $152.31. In just five trading days, the amplitude exceeded 30%. Such volatility has made Wall Street take notice.

As of July 17, SKHY’s total market capitalization is about $1.07 trillion (here, referring to the market-cap equivalent based on the Korean-listed shares). But the ADR’s actual float market cap in the US is only about $31.3 billion. Even more intriguing: the ADR trades at roughly a 40%-42% premium versus the Korean primary listing (000660.KS). This premium comes from the early listing period where only a one-way conversion mechanism from “ADR → Korean shares” was allowed; the arbitrage channel had not been fully opened. Starting July 29, two-way conversions will be available. This structural premium is likely to be quickly compressed by market forces.

II. The performance foundation: a “printing press” with a 72% profit margin dominating the field

SK Hynix’s fundamentals are arguably a “gold standard” in the memory-chip industry.

‌First-quarter 2026 data is startling‌:

Revenue of 52.58 trillion KRW (about $10.7k), up 198% year over year, up 60% quarter over quarter, setting a record high for the quarter;

Operating profit of 37.61 trillion KRW, up 405% year over year, up 96% quarter over quarter, with four straight quarters of record highs;

‌Operating profit margin as high as 72%‌—not only crushing Nvidia’s GAAP operating profit margin of about 65.6% in the same period, but also far outstripping TSMC’s 58.1% level;

Net profit of 40.35 trillion KRW, net margin of 77%, and earnings per share of 57,175 KRW;

Cash and short-term financial assets on the books of 54.33 trillion KRW, net cash exceeding 35 trillion KRW, with very light debt pressure.

‌In terms of business structure, HBM is the absolute profit engine.‌ SK Hynix’s HBM profit contribution is close to 50%. With 12-layer HBM3E shipments being progressed as planned, HBM3E is expected to account for more than half of its HBM3E sales. Thanks to early deep ties with Nvidia, SK Hynix is expected to maintain a market share of 60%+ in the global HBM market. HBM4 products are also in early joint development with customers, and the mass production timeline is clearly visible.

In addition, the company has established an annual performance bonus system funded by 10% of operating profit—indirectly confirming management’s confidence in long-term profitability. In 2025, the company distributed a per-employee performance bonus of about 650k RMB, the highest in company history. If 2026 full-year results deliver as expected, this figure could rise significantly further.

III. Key support and resistance levels: a technical battlefield of longs vs. shorts

Based on the recent extreme volatility and market structure, the following technical levels are worth focusing on.

‌For strong support levels, the 145-150 US dollar range is the primary area to watch.‌ This is not only near the $149 issue price, but also the psychological anchor after the first day’s opening at $170 on July 10 retraced. Combined with expectations of two-way conversion opening starting July 29, arbitrage capital may step in and take positions within this range. If market panic sentiment continues further, the 135-140 US dollar range forms secondary support—this is the 0.618 retracement level of the prior upswing structure, and it also roughly corresponds to the theoretical price where ADR’s premium compresses to within 20%.

‌As for resistance levels, the immediate priority is the 170-177 US dollar range.‌ This corresponds to the July 10 first-day opening price and the intraday high zone, and also the key resistance level before the July 16 crash. Higher up, the strong resistance sits at 190-195 US dollars, corresponding to the July 14 historical peak of $194.80. If this breaks, it would imply that the market’s pricing for the HBM super-cycle will be revised upward again.

‌The core variable is July 29.‌ The ADR and Korean-share two-way conversion mechanism will officially go live then. An approximately 2.5% convertible ADR pool (basically equal to the size of this issuance) will unlock arbitrage opportunities. The ADR premium will most likely compress from above 40% currently to a 15%-20% range. This means SKHY’s US stock price faces periodic pullback pressure. At the same time, it also provides a more reasonable entry window for long-term investors.

IV. Outlook for the road ahead: certainty of a super-cycle, and inevitability of short-term volatility

The bullish case: three-fold resonance supports a long-term bull market

‌First, the supply-demand gap keeps deepening.‌ Korean securities analyst Kim Sunwoo clearly pointed out that in 2H 2026, DRAM demand satisfaction will be only 75%-80%, and in 2027 it will further fall into the 60% range. SK Hynix CEO Kwak Lu-jung even raised his voice saying, “2027 will become the most supply-tight year in the industry’s history,” and expects that even after 2030, customer demand will still be higher than supply capacity. Intel CEO Pat Gelsinger also stated that memory supply and pricing won’t see relief at least before 2028.

‌Second, there is still room for HBM prices to rise.‌ According to DigiTimes, driven by both an explosion in AI compute demand and structural production shortages, HBM prices are expected to double in 2027. Gartner predicts global HBM revenue will jump from $33.0 billion in 2025 to $86.0 billion in 2027, with a CAGR of 60.5%.

‌Third, valuations remain at historical lows.‌ Based on the forward P/E for 2027, SK Hynix is only about 3.5-4.8x, while Samsung Electronics is about 3.9x—both in an extremely low historical range. As Kim Sunwoo put it: “The degree of panic is directly proportional to the expected return.”

Risk warning: three swords hanging overhead

‌First, pressure from short-term profit-taking is huge.‌ Within one week of listing, SKHY rose from $149 to $194 and then fell back to $152. The turnover rate is very high, and short-term capital crowding has already reached a warning level.

‌Second, the competitive landscape is changing.‌ Samsung Electronics plans to invest 140 trillion KRW to expand its HBM production lines. UBS has raised its 2027 forecast for Samsung’s HBM shipments to 525.8k Gb (up 137% year over year). If that materializes, Samsung would match SK Hynix with roughly 40% each. Micron’s Hiroshima plant in Japan is also accelerating expansion.

‌Third, risk of ADR premium reverting.‌ A premium of more than 40% will inevitably shrink after two-way conversion. This is not a “whether” question, but a “how fast” question.