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KOSDAQ Jumps 2.28% as Korea’s Rally Broadens Beyond Mega-Cap Chips

작성자:K jumma 마지막 수정일:

KOSDAQ gained 2.28% with 962 advancers. That was the most revealing number in Korea’s September 9 session. KOSPI reclaimed the 7,000 threshold, but the more important change from the previous day’s mega-cap-driven volatility was the broadening of demand into smaller growth and infrastructure stocks. KOSPI closed 97.12 points higher at 7,051.64, up 1.40%, while KOSDAQ advanced 18.49 points to 830.37, up 2.28%. KOSPI faded from an intraday high of 7,112.48, whereas KOSDAQ finished just below its 830.87 high.

Foreign flows favored KOSDAQ, not the main board

On KOSPI, retail investors sold a net KRW 2.288 trillion and foreign investors sold KRW 435.1 billion, while institutions bought KRW 942.2 billion. Large purchases by other corporations, already above KRW 1 trillion in the afternoon tally, also helped absorb the supply. KOSDAQ had a different flow profile: foreigners bought a net KRW 225.2 billion as retail investors sold KRW 214.8 billion. Market breadth was moderately positive on KOSPI, with 463 advancers against 400 decliners, and clearly positive on KOSDAQ, with 962 advancers against 672 decliners.

USD/KRW eased to around 1,336.7 in the afternoon. Middle East tensions and oil above USD 90 per barrel remained a macro headwind, but a firmer won and the prior night’s 1.3% gain in the Philadelphia Semiconductor Index supported risk appetite. KOSPI’s return above 7,000 one session after a sharp intraday reversal suggests that the prior selloff did not yet become a broader trend break.

AI memory remained the anchor, with equipment taking the lead

SK hynix gained 3.51% to KRW 1,856,000, while Samsung Electronics finished flat at KRW 269,500. This was still an AI-memory-led rebound, but not a uniform rally across the two dominant index weights. Buying broadened into Jusung Engineering, up 6.12%, EO Technics, up 5.26%, and Wonik IPS, up 3.71%. AI investment expectations and a memory-supply shortage narrative helped, while positioning ahead of the September 10 KRX semiconductor-index rebalancing favored equipment names.

Investors should separate fundamental momentum from mechanical flows. SK hynix reflects expectations for HBM demand, but semiconductor ETFs may need to sell portions of SK hynix and Samsung Electronics and buy equipment names to comply with a 20% single-stock cap. The estimated rebalance flow is large enough to distort closing prices, making the next session’s auction more informative than today’s headline gains alone.

Rotation reached batteries, power and optical networking

The highest-beta rotation appeared in battery materials. Lotte Energy Materials jumped 14.11%, L&F rose 11.70%, and SK Innovation gained 11.23%. Lotte Chemical advanced 18.12% and Korea Petrochemical rose 13.59%, adding a recovery in beaten-down chemical names. One strong session does not resolve weak EV demand or industry overcapacity. For now, this looks more like a forceful rotation supported by foreign KOSDAQ buying than confirmation of a full earnings-cycle turn.

Power and networking, the next constraints on AI infrastructure, provided another leadership group. Expectations that data centers will add on-site generation while waiting for grid connections pushed Bumhan Fuel Cell to its 29.79% daily limit and Doosan Fuel Cell up 9.44%. Gaon Cable rose 16.70% and LS ELECTRIC gained 5.49%. Verizon’s long-term fiber agreement with Corning then carried the theme into Korean optical-network shares: Mercury and Wooriro hit their daily limits, while RF Materials rose 22.61%.

Nuclear equipment formed a separate pocket. Woori Technology gained 21.25% on expectations for decommissioning and control-system orders, while large-cap Doosan Enerbility rose 2.46%. Fuel cells, cables, optical components and nuclear equipment all fit the broader power-and-connectivity story, but their contract timing and profit conversion differ sharply. Strong thematic price action should be followed by company-level order and earnings checks.

KSI view: breadth improved, but expiry flows are the next test

The quality of the rebound improved because KOSDAQ outperformed and participation expanded. Yet foreign investors remained net sellers on KOSPI. The index was supported by institutions and other corporations, so a durable move above 7,100 will probably require foreign cash and futures demand to join.

The next session brings September derivatives expiry and KRX sector-index rebalancing. Program trades could pressure the largest chip names late in the day while supporting selected equipment stocks. Investors should also watch whether USD/KRW stays in the mid-1,330s and whether rate volatility increases ahead of U.S. inflation data. September 9 confirmed a recovery in risk appetite; September 10 will test whether leaders can hold their closes after mechanical flow shocks.

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