SK Hynix, Explained by a Korean: Record Profits, Wild Stock Swings

 If you've checked SK Hynix's stock chart at any point since June, you've probably seen it swing from an all-time high to a "flash crash" to a Nasdaq debut to an investment-warning designation — sometimes within the same week. This is a memory-chip maker that just posted the largest quarterly profit in its history, and also the stock that Korean retail investors have been calling, in a mix of frustration and dark humor, one of the most stressful things they own right now. Both of those things are true at once, and untangling them is the point of this post.

Record Q2 2026 Earnings — The Official Numbers

SK Hynix reported second-quarter 2026 results on July 29, 2026, and they were the strongest quarterly numbers in the company's history: revenue of 79.3187 trillion won, operating profit of 60.5426 trillion won, and an operating margin of 76% (SK hynix Newsroom, 2026-07-29). Revenue was up 51% from the previous quarter and 257% from a year earlier; operating profit rose 61% quarter-on-quarter and 557% year-on-year. First-half cumulative revenue passed 100 trillion won for the first time in the company's history.

Net profit for the quarter came in even higher than revenue — 93.9226 trillion won, a net margin of 118%. That number needs a clear caveat: it is not a sign that the core chip business is more profitable than its own sales figure. Roughly 62.2 trillion won of that quarter's non-operating income came from one-time items — mainly 63.3 trillion won in gains from the valuation and sale of investment assets, plus 1.1 trillion won in foreign-exchange gains (Capital Market News, 2026-07-31; Hankyung/Korea Economic Daily separately reported this as an investment stake — held for roughly eight years — that appreciated from about 4 trillion won to about 63 trillion won, 2026-07-31). Multiple outlets, including CBC News, cautioned against reading the full 93.9 trillion won net-profit figure as a repeatable measure of the semiconductor business itself, and recommended judging the core operation by revenue, operating profit, and operating margin instead — the 79.3 trillion / 60.5 trillion / 76% set above.

Product Lineup: HBM4, DRAM, and NAND

Behind those earnings is a product mix increasingly centered on AI memory. SK Hynix said HBM4 mass-production shipments began in the second quarter of 2026, with HBM4E samples already shipped out earlier in the first half (SK hynix Newsroom, 2026-07-29). The same announcement noted broad quarter-on-quarter price increases across DRAM and NAND, with the company emphasizing high-value products — HBM and AI-server DRAM and eSSDs — as its strategic focus. On the NAND side, 321-layer product now accounts for the largest share of production, and the company said it plans to expand that to about half of domestic output by year-end.

Planned 2026 capital expenditure sits in the high-40-trillion-won range, tied to accelerating the M15X production schedule and expanding capacity after the Yongin Fab 1 cleanroom comes online in early 2027. SK Hynix also said it signed multi-year supply agreements with roughly ten major customers to lock in stable, long-term demand (all: SK hynix Newsroom, 2026-07-29).

On market share, industry research firm TrendForce is the source most often cited, though the exact figures vary depending on which secondary aggregator is reporting them: SK Hynix held 58% of the HBM market in Q1 2026 (down from 69% a year earlier) and 62% in Q2, retaining the top spot ahead of Micron (21%) and Samsung (17%) (TrendForce data via Astute Group/Presenc AI, 2026). A separate August figure put the share at "50–55%." Because these numbers come from different secondary aggregations of TrendForce data rather than a single original report, the precise percentage at any given point should be treated as approximate — the consistent part is that SK Hynix has stayed in first place while its share has eased somewhat from a year ago.

On the customer side, TrendForce reported that SK Hynix is expected to supply roughly two-thirds (about 66–70%) of Nvidia's HBM4 demand (TrendForce, 2026-01-28). Separate secondary reporting attributes to UBS a forecast that SK Hynix could reach about 70% share of HBM4 supply for Nvidia's upcoming Rubin platform, and to Goldman Sachs an assessment that SK Hynix would hold at least 50% of overall HBM share through 2026 on the strength of its HBM3/HBM3E position — both of these are secondary citations, and the original UBS and Goldman reports were not directly verified in the research behind this post.

The Nasdaq ADR Listing

In one of the largest foreign-company IPOs on a U.S. exchange, SK Hynix listed American Depositary Receipts (ticker: SKHY, 10 ADRs per 1 common share) on the Nasdaq around July 10, 2026, issuing 17.79 million new shares (CNBC, 2026-06-24; SEC Form 424B4/F-1/A). CNBC's pre-listing report cited a target of roughly $29 billion; the deal ultimately raised about $26.5 billion when it priced (Bloomberg, 2026-07-10). The IPO priced at $149, opened at $170, and closed its first day at $168.01, up 13% (Bloomberg, CNBC, 2026-07-10). At the Nasdaq ceremony, SK Group Chairman Chey Tae-won told CNBC "the demand is enormous, exponentially, so I don't really see signs that HBM demand is shrinking," while SK Hynix CEO Kwak Noh-jung thanked investors and customers (CNBC, 2026-07-10).

The optimism didn't last through the following weeks. On July 13, the Korea Exchange-listed shares (ticker 000660) fell more than 15% in a single day, described by CNBC as the stock's "worst day" (CNBC, 2026-07-13), and shares dropped again on July 28 amid a broader semiconductor sell-off (CNBC, 2026-07-28).

A Volatile Summer: The Timeline

The price action from June through August is easiest to follow as a timeline, since single data points out of context can be misleading:

• June 25: Intraday all-time high of 2,987,000 won (Financial News, cited 2026-08-09).
• July 29: Fell to 1,246,000 won — coincidentally, the same day as the Q2 earnings release.
• August 6: A pre-market "flash crash" on the Nextrade alternative exchange sent shares down the full 30% daily limit at one point; the regular session still closed down as much as 9.8% (Bloomberg, CNBC, 2026-08-06). Cited contributing factors included broader Wall Street weakness in AI-related stocks, reports about China's push into memory chips and lithography equipment, and volatility amplified by leveraged ETFs.
• August 7: Shares fell again, a day after the 10% drop (Hankyung, 2026-08-07).
• August 10: Closed at 1,420,000 won, the first day without further losses after roughly 16.5% combined decline over August 6–7.
• August 11–24: The Korea Exchange designated SK Hynix (and SK Square) as an "investment alert" stock, a rule triggered when the top 10 accounts' buying participation exceeds a threshold on 4-or-more of the last 15 trading days (a rule introduced after a 2023 CFD stock-manipulation case). SK Hynix qualified after rising 244% over the prior year (Edaily MarketIn, 2026-08). Some retail investors publicly called the designation "outdated."
• August 12: Shares jumped 5.54% at the close (as much as 8% intraday) after a report that Singapore's sovereign wealth fund, Temasek, was considering direct investment in Samsung Electronics and SK Hynix (Asia Economy exclusive, via Investing.com, 2026-08-12). This is worth flagging clearly: the Temasek investment is an unconfirmed report, not a completed or confirmed deal. According to the report, it would be Temasek's first direct investment in the Korean market, with the fund reportedly viewing memory semiconductors as an undervalued part of the AI value chain — but the amount and timing were not disclosed.
• August 13: Shares rose another 5.92% to close at 1,593,000 won, a third straight day of gains, alongside a softer U.S. July CPI reading and a technical bull-market milestone for the KOSPI.
• August 25–26: The Nasdaq ADR (SKHY) rose 2.7% following an analyst upgrade (MarketBeat, 2026-08-25). On August 26, the Korea-listed shares (000660) traded around 1,688,000 won (prior close 1,678,000 won, intraday range 1,662,000–1,735,000 won; 52-week range 253,000–2,987,000 won), while SKHY closed at $159.53 on August 25 (Yahoo Finance data, cited 2026-08-26). Slightly different snapshots from other sources in the same window (000660 around 1,676,000–1,688,000 won, SKHY around $158–159.5) likely reflect different quote-capture times rather than a real discrepancy.

One additional data point — a reported "+11.73%" move on August 26 — did not match other same-day figures in the available reporting, so it is treated here as a single, lower-confidence source rather than a confirmed number.

Analyst Price Targets: A Wide Split

Korean brokerages are unusually far apart on where this stock should be valued, and that gap is itself a data point worth reporting rather than resolving. KB Securities has a 4.2 million won price target with a Buy rating, arguing that AI infrastructure demand is broadening from generative AI into agentic AI, robotics, and autonomous driving, and that the Nasdaq listing could act as a valuation re-rating catalyst similar to what happened with TSMC's ADR (Investchosun, 2026-07-09). BNK Securities, on the other end, has a 1.85 million won target with a Hold rating, citing concerns that hyperscalers' aggressive infrastructure spending could slow starting next year and that Chinese competitors could enter the commodity memory market (Investchosun, 2026-07-09; Hankyung also reported a separate case of a brokerage cutting its target from 4.2 million to 2.8 million won, 2026-08-03).

Other individual figures — including numbers attributed to Shinhan Investment, Heungkuk Securities, and Korea Investment & Securities — surfaced in search results but could not be directly verified against original source documents, so they are omitted here as unconfirmed. (One of those figures also carried a report date that had not yet occurred as of this writing, suggesting a possible date error in that source.)

Aggregated figures give a sense of the broader range: the average Korean brokerage target is reported at around 3.46 million won (Alpha Square, 2026-08), while a global analyst consensus of 39 analysts put the average 12-month target at 3,164,332 won, with a high of 5.3 million won and a low of 1.2 million won — a separate check of the same period found a nearly identical figure (38 analysts, all rating it a "Strong Buy," average target 3,164,332 won), which lends some cross-verification confidence to that number. For the Nasdaq ADR, one source (Mitrade, single-source, lower confidence) put the 12-month average target at $244.17, with a high of $355 and a low of $152, and estimated the ADR trading at roughly a 35% premium to the Korea-listed shares.

The core takeaway on price targets is the spread itself, not a "right answer." A price target more than double another for the same stock, at the same time, from licensed brokerages, reflects a genuine and unresolved disagreement about whether current AI infrastructure spending is a durable multi-year trend or a cycle that slows down — not a case where one firm is simply better-informed than the other.

How Local Investors Have Reacted

A caveat up front: this research did not pull original posts from Korean investor forums such as DC Inside, Clien, or Naver's stock discussion boards directly. What follows is drawn from mainstream Korean financial press coverage of investor sentiment, which is a step removed from the original community posts themselves.

Financial News ran a piece headlined (in translation) "sell everything the moment it bounces," describing frustration among retail investors who took losses during the sharp declines, along with talk of an "analyst blacklist" mood in some circles (2026-08-09). A securities-industry source quoted in coverage from the same period described an atmosphere where "SK Hynix falls even when Samsung Electronics rises," attributing it partly to a pile-up of rumors weighing on sentiment. One widely cited example: comedian Kim Won-hoon disclosed buying SK Hynix shares at 2.76 million won and adding to the position afterward, ultimately reporting overall stock losses exceeding 24 million won. The investment-alert designation in mid-August also drew public pushback from some retail investors, who called it "outdated" (Edaily MarketIn, 2026-08) — notably, other stocks that had also rallied sharply, such as Hyosung Heavy Industries and Hanwha Aerospace, received similar designations around the same time, but reporting suggests SK Hynix's case drew disproportionate market frustration.

It's worth being honest about the limits of this picture: these examples do not necessarily represent the full range of retail sentiment. Coverage of more optimistic reactions — investors treating the pullback as a buying opportunity — was comparatively harder to find in the available reporting. Whether that reflects an actual majority-negative mood or simply which stories got covered is not something this research can settle either way.

What Stands Out to Me

Looking at this data side by side, the split between the earnings and the stock chart is the most striking part. The business itself — record revenue, record operating margin, an HBM4 ramp that's reportedly capturing a majority of Nvidia's near-term demand — is not really in dispute. What's volatile is the market's view of how long that demand holds up, and that shows up directly in a price-target range wide enough to span a "Buy" and a "Hold" for the same company in the same week.

The net-profit headline is a good example of a number that's technically accurate and easy to read the wrong way. A 118% net margin sounds almost unbelievable next to a 76% operating margin, and it is — because more than 60 trillion won of it came from marking an old investment stake to market, not from selling more chips. Treating the two profit figures as interchangeable would badly overstate how repeatable this quarter's bottom line actually is.

The Temasek report is the one piece of this story I'd flag most for outside readers to watch rather than assume: it moved the stock over 5% in a single session on a report with no confirmed amount, timing, or even a Temasek statement attached, at least as of the reporting available here. That kind of rumor-driven move is a useful reminder of how much sentiment, rather than new operating data, is currently swinging this stock day to day — separate from where the underlying business itself stands.

Wrapping Up

SK Hynix's second quarter of 2026 was, by revenue and operating profit, the strongest in the company's history, driven by HBM4 ramp-up and firm DRAM/NAND pricing — but the eye-catching 93.9 trillion won net profit figure is inflated by a one-time investment gain and shouldn't be read as the company's ongoing earning power. Its stock, meanwhile, has swung from an all-time high in June to a sharp low in late July, through a pre-market flash crash in early August, an investment-alert designation, and a rumor-driven rebound tied to unconfirmed reports of Temasek interest — all inside about two months. Analyst price targets remain split by more than two-to-one between the most bullish and most cautious Korean brokerages, reflecting a real, unresolved disagreement over how long the current AI memory demand cycle lasts. None of this points to a single direction for where the stock goes next — it points to a company whose operating results and stock price are, for now, telling two different stories.