KOSPI Closes Higher at 5,550.30…Strength in SK hynix and Samsung E&A

Market at a Glance

KOSPI ended trading at 5,550.30, up 0.30%. Of the 888 stocks traded on KOSPI, 173 rose, 701 fell, and 14 were unchanged, with decliners prevailing. Trading value was approximately 25 trillion won, and trading volume was 290.33 million shares. By investor type, foreign investors were net sellers, while individuals, institutions, and other investors were net buyers.

On KOSDAQ, 515 stocks rose, 1,113 fell, and 85 were unchanged out of 1,713 stocks. The average change rate was -1.00%, while trading value was approximately 6.9209 trillion won and trading volume was 538.55 million shares. By investor type, foreign investors and institutions were net sellers, while individuals and other investors were net buyers.

Market Leaders

SK hynix, one of the leaders by trading value, closed at 1.263 million won, up 2.35%. Trading volume was 5.91 million shares and trading value was approximately 726.15 billion won, while its change rate over the past five trading days was -0.16%. Foreign investors were net sellers, while individuals and institutions were net buyers.

Samsung Electronics ended trading at 213,500 won, down 0.47%. Trading volume was 26.77 million shares, trading value was approximately 561.98 billion won, and its change rate over the past five trading days was -1.61%. Foreign investors and individuals were net sellers, while institutions were net buyers.

Stocks in Focus

Samsung E&A closed at 59,100 won, up 6.68%. Trading volume was 13.09 million shares and trading value was approximately 780 billion won, while its change rate over the past five trading days was 35.55%. Foreign investors were net buyers, while individuals and institutions were net sellers.

Samsung Biologics ended trading at 1.46 million won, up 7.20%. Trading volume was 140,000 shares, trading value was approximately 204.4 billion won, and its change rate over the past five trading days was 12.83%. Foreign investors and institutions were net buyers, while individuals were net sellers.

G2G Bio on KOSDAQ closed at 49,600 won, up 18.66%. Trading volume was 3.15 million shares, 4.85 times the 20-day average, and its change rate over the past five trading days was 58.97%. Foreign investors and individuals were net sellers, while institutions were net buyers.

Key Filings

Samsung E&A disclosed a “Decision on Share Cancellation” and a “Major Matters Report (Decision on Acquisition of Treasury Shares).” Samsung Biologics submitted a “[Corrected] Investment Prospectus” and a “[Corrected] Securities Registration Statement (Equity Securities).” G2G Bio disclosed “Major Management Matters Related to Investment Decisions (Execution of a Platform Evaluation Agreement Related to the Development of Long-Acting Injections).” SK hynix disclosed a “Clarification Regarding Rumors or Reports.”

• SK하이닉스 · 풍문또는보도에대한해명 (000660) — View DART filing
• 삼성바이오로직스 · [기재정정]투자설명서 (207940) — View DART filing
• 삼성바이오로직스 · [기재정정]증권신고서(지분증권) (207940) — View DART filing
• 삼성E&A · 주식소각결정 (028050) — View DART filing
• 삼성E&A · 주요사항보고서(자기주식취득결정) (028050) — View DART filing

Next Trading Day Checkpoints

• Whether KOSPI’s upward trend continues and changes in KOSDAQ’s average change rate
• Changes in the distribution of advancing, declining, and unchanged stocks on KOSPI and KOSDAQ
• Changes in the trading volumes of SK hynix, Samsung E&A, and G2G Bio
• Whether additional filings are made by major stocks

This article was prepared based on the market, stock, and disclosure information for October 23, 2,026, included in the FACT JSON, and contains no investment solicitation or outlook.