K-Chips & Batteries Weekly — 2026-10-02

2026-10-02 · market

Korean equities exhibited distinct internal rotation this week, characterized by a sharp bifurcation between consolidating mega-cap leaders and surging supply-chain components. On Friday, the benchmark KOSPI advanced 0.46% to close the week on a positive note, while the tech-heavy KOSDAQ slipped 0.11%. Beneath the headline index stability, institutional and retail flows shifted aggressively down the market-cap spectrum. Mega-cap semiconductor bellwethers took a breather following their multi-week run, prompting investors to redeploy capital into high-beta equipment and materials plays. Concurrently, the beaten-down secondary battery complex staged a broad-based relief rally led by copper foil and specialty chemical suppliers, lifting the entire cohort into positive territory for the five-day period.

Semiconductors: Equipment and Materials Outperform as Mega-Caps Pause

Korea’s semiconductor space continues to carry powerful medium-term momentum, as reflected by a robust median 20-day return of +28.07%. However, the week’s price action showed clear consolidation at the top of the supply chain. Samsung Electronics declined -3.84%, leading sector laggards, while SK Hynix retreated -0.91%. Test socket provider ISC also softened, giving up -1.41%. The softness in the memory leaders reflects a period of digestive positioning following aggressive foreign inflows tied to the artificial intelligence and high-bandwidth memory (HBM) trade.

In contrast, capital rotated rapidly into specialized equipment and materials names, driving outsized weekly gains. High-pressure hydrogen annealing specialist HPSP led the sector with an impressive +19.06% gain, driven by renewed optimism over advanced-node adoption. Materials supplier Soulbrain rallied +14.67%, while test socket and pin manufacturer Leeno Industrial advanced +13.94%. This divergence indicates that while investors remain cautious about chasing frontline memory valuations at current levels, appetite for structural beneficiaries of advanced packaging, node migration, and consumable test interfaces remains exceptionally high.

Batteries: Materials and Copper Foil Lead Broad-Based Gains

The secondary battery sector extended its recent stabilization, posting a median 20-day return of +8.65%. Unlike semiconductors, where returns were split, battery sentiment was uniformly positive across the board—to the extent that the week’s primary laggards still delivered green prints. Cell manufacturers and integrated energy plays trailed the broader rally: Samsung SDI gained +1.34%, SK Innovation rose +2.49%, and cathode producer POSCO Future M finished up +3.49%.

The real alpha this week was concentrated in upstream materials and copper foil producers, which experienced sharp, high-volume rebounds. Lotte Energy Materials surged +28.68%, making it the top performer across our coverage, while SKC gained +19.98%. Nano Materials also posted a notable +14.92% return. This surge in copper foil and specialized additives suggests a mixture of short-covering and tactical bottom-fishing, as market participants reassess deeply discounted valuations in non-cell segments that had previously borne the brunt of electric-vehicle demand concerns and inventory adjustments.

The Week Ahead: What to Watch

The domestic corporate earnings calendar is light over the coming week, shifting market attention toward macro indicators and high-frequency industry datapoints. In semiconductors, key indicators to monitor include DRAM and NAND spot-price momentum alongside updates to global hyperscaler capex forecasts. For the battery sector, investors should track preliminary regional export data for cathode materials and cells, alongside any incremental signals regarding North American and European EV adoption rates, to gauge whether this week’s copper foil and materials rebound represents a durable trend or short-term mean reversion.

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.