SK Hynix (000660): Where It Stands — 2026-10-13 Deep Dive

2026-10-13 · semiconductor · SK Hynix data page

As of 2026-10-13 (Seoul close). Live numbers on the SK Hynix data page.

Sharp De-Rating Below Moving Averages Amid Foreign Selling

SK Hynix (KRX: 000660) closed down 8.22% to ₩1,473,000 on 13 October 2026, significantly underperforming a broader market sell-off that saw the KOSPI fall 5.46% and the KOSDAQ decline 1.43%. The single-day drop caps a severe multi-week drawdown: the stock is down 20.03% over the past 5 trading sessions, 20.64% over 20 sessions, and 20.16% over 60 sessions.

This momentum stands in stark contrast to the broader domestic peer group. While SK Hynix fell 20.64% over the 20-day trailing window, covered Korean semiconductor peers recorded a median 20-day gain of +9.58%, reflecting a clear divergence away from SK Hynix rather than uniform sector weakness.

Technically, the decline has breached critical intermediate thresholds. Today’s close of ₩1,473,000 sits 16.5% below its 20-day moving average (₩1,764,100) and 13.4% below its 60-day moving average (₩1,700,133). In the context of its 52-week band of ₩336,500 to ₩2,919,000, the stock has surrendered nearly half of its peak valuation, currently sitting at the 44.0% mark of its annual range.

Trading flows revealed heavy divergence between investor classes: foreign accounts registered a net outflow of 1,598,003 shares, while domestic institutional investors absorbed 418,227 shares on the bid.

Company Drivers: AI Beta Unwinding and Margin Sensitivity

The heavy foreign offloading (-1,598,003 shares) and sharp underperformance relative to domestic semiconductor peers (+9.58% 20-day median) point to company-specific positioning unwinds rather than a standard market-wide drawdown.

As the primary supplier of High Bandwidth Memory (HBM3 and HBM3E) to global AI accelerator customers, SK Hynix has carried the highest operational beta to generative AI infrastructure expenditure among Korean large-cap equities. The stock’s rally toward its 52-week peak of ₩2,919,000 was powered by premium pricing and high allocations in leading-edge packaging. However, the current drop to ₩1,473,000 indicates that foreign market participants are reducing high-beta exposure amid cyclical reassessments of premium memory margins.

Furthermore, while the 20-day peer median remained positive, SK Hynix’s product mix remains heavily weighted toward DRAM and enterprise NAND. In periods of macroeconomic stress—highlighted by the KOSPI’s 5.46% single-day drop—investors frequently price in faster margin erosion for pure-play memory makers compared to diversified technology conglomerates or domestic equipment and materials suppliers. Domestic institutions provided partial absorption (+418,227 shares), but the scale of foreign liquidation overpowered local support levels.

Risks and Caveats

• HBM Competition and Pricing Normalization: Any acceleration in competitive qualification from secondary HBM vendors risks compressing the premium pricing structure that supported SK Hynix’s climb to ₩2,919,000.
• Persistent Foreign Outflows: Foreign net selling exceeding 1.59 million shares in a single session signals institutional de-risking; absent a reversal in cross-border flows, overhead technical resistance at the 20-day MA (₩1,764,100) remains substantial.
• Legacy Memory Cyclicality: Despite advanced packaging dominance, exposure to standard DDR5 and NAND leaves earnings exposed should consumer electronic end-demand fail to recover alongside enterprise infrastructure.
• Broader Market Liquidity: With the benchmark KOSPI shedding 5.46% in a single session, elevated volatility and broader market-wide margin calls could drive indiscriminate selling across high-liquidity names like SK Hynix, regardless of underlying fab utilization rates.

This note was produced by Chip & Cell’s data pipeline with model-assisted analysis. It is not investment advice; verify all figures against primary sources.

Not investment advice. Figures are as of publication and may contain errors — see methodology.