K-Chips & Batteries Weekly — 2026-10-09

2026-10-09 · market

South Korean equities closed the week on a turbulent note as large-cap weakness pulled the KOSPI down 2.62% on Friday, while the tech-heavy KOSDAQ showed relative resilience, falling just 0.69%. Despite the late-week retreat, medium-term sector momentum remained firmly positive across key tech verticals, reflected in 20-day median gains of +14.12% for semiconductors and +17.11% for secondary batteries. However, weekly performance diverged sharply by sector: battery materials staged an across-the-board advance where even the softest performers finished in the green, whereas semiconductors fractured into a bifurcated tape marked by institutional profit-taking in memory giants and aggressive rotation into niche testing and equipment names.

Semiconductor: Large-Cap De-risking Meets Down-Cap Strength

The domestic semiconductor space registered wide dispersion over the five-day trading window, masking an otherwise solid 20-day median return of +14.12%. Pressure on the KOSPI was acutely felt in AI-leveraged memory leaders, with index bellwether SK Hynix sliding -5.44% on the week. Downstream and consumables providers followed suit: test socket maker ISC declined -6.10% to lead sector laggards, while silicon carbide (SiC) ring producer TCK shed -3.30%.

Conversely, institutional and retail liquidity flowed into high-spec testing and semiconductor equipment plays. Leeno Industrial emerged as the standout performer, jumping +19.13% over five sessions on renewed focus on high-margin probe pins and test sockets for advanced node architectures. Front-end equipment specialist Jusung Engineering gained +13.33%, supported by ongoing demand visibility for atomic layer deposition (ALD) systems. Meanwhile, outsourced semiconductor assembly and test (OSAT) player Hana Micron gained +5.46%, underscoring a clear rotation away from primary memory manufacturers and into specialized backend and niche capital equipment providers.

Battery: Comprehensive Rebound Across the Supply Chain

Korea’s secondary battery complex delivered broad-based outperformance this week, reinforcing its strong 20-day median return of +17.11%. In contrast to the mixed tape in semiconductors, the battery supply chain posted positive five-day returns across all tracked constituents, with the week’s laggards still generating solid mid-single-digit gains.

Copper foil manufacturer Lotte Energy Materials led the entire tech complex with a dramatic +31.83% five-day rally, breaking out after a prolonged consolidation phase. The EcoPro complex also provided substantial index support to the KOSDAQ, with cathode producer EcoPro BM surging +16.06% and holding entity EcoPro climbing +13.86%. Even the relative laggards in the group maintained upward trajectories: Cosmo AM&T advanced +7.47%, anode and cathode producer POSCO Future M rose +6.69%, and L&F finished up +3.21%. The uniformity of these gains suggests systematic short-covering and high-beta momentum re-engagement rather than company-specific idiosyncratic drivers, driving a temporary decoupling from end-market electric vehicle demand concerns.

The Week Ahead: What to Watch

The domestic corporate earnings and macroeconomic calendar is comparatively light next week, with few major scheduled company disclosures or policy releases slated to serve as immediate domestic catalysts. Market participants will primarily gauge follow-through from Friday’s sharp -2.62% KOSPI selloff, focusing on foreign institutional net flows to see if the retreat represents a brief liquidity flush or a broader positioning trim. Key variables to track include whether the battery sector can defend its elevated levels following steep multi-week rallies (+17.11% 20-day median), and whether large-cap semiconductor proxies like SK Hynix find technical support after a -5.44% weekly correction.

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.