KOSPI Falls 1.98%…SK Hynix and Peptron Plunge, RaonSecure Surges

Market at a Glance

The KOSPI closed at 6,803.90. Of the 890 stocks traded on the KOSPI, 348 advanced, 491 declined, and 51 were unchanged, with decliners predominating. Trading value was approximately KRW 30.9695 trillion, and trading volume was 328.91 million shares. By investor category, foreign investors and institutions were net sellers, while individuals and other investors were net buyers.

On the KOSDAQ, 635 stocks advanced, 1,016 declined, and 71 were unchanged, also indicating that decliners predominated. The average change rate was -0.70%, trading value was approximately KRW 10.4132 trillion, and trading volume was 650.71 million shares. Foreign investors, institutions, and other investors were net sellers, while individuals were net buyers.

Leading Market Stocks

SK Hynix, one of the leading stocks by trading value, fell 3.87% to 1,715,000 won. Trading volume was 3,908,569 shares, trading value was approximately KRW 6.8038 trillion, and its change rate over the past five trading days was -4.19%.

Samsung Electronics fell 1.28% to 269,000 won. Trading volume was 24,741,933 shares, trading value was approximately KRW 6.7467 trillion, and its change rate over the past five trading days was -2.00%.

Stocks in Focus

RaonSecure rose 9.95% to 16,350 won. Trading volume was 18,485,888 shares, or 10.90 times its 20-day average, and its change rate over the past five trading days was 46.64%.

Peptron fell 25.15% to 97,000 won. Trading volume was 2,522,585 shares, or 10.30 times its 20-day average, and its change rate over the past five trading days was -26.07%.

Hyosung Heavy Industries fell 6.53% to 2,620,000 won. Trading volume was 216,070 shares, or 4.25 times its 20-day average, and its change rate over the past five trading days was -7.06%.

Key Disclosures

Recent disclosures included SK Hynix’s “Changes in Product and Service Transactions with an Affiliate Company of the Same Person, etc.”; Samsung Electronics’ “Report on Changes in Shares Owned by the Largest Shareholder, etc.” and “Report on the Status of Ownership of Specific Securities, etc. by Executives and Major Shareholders”; and Hyosung Heavy Industries’ “[Correction] Conclusion of a Single Sales and Supply Contract.”

• SK하이닉스 · 동일인등출자계열회사와의상품ㆍ용역거래변경 (000660) — View DART filing
• 삼성전자 · 최대주주등소유주식변동신고서 (005930) — View DART filing
• 삼성전자 · 임원ㆍ주요주주특정증권등소유상황보고서 (005930) — View DART filing
• 효성중공업 · [기재정정]단일판매ㆍ공급계약체결 (298040) — View DART filing

Next Trading Day Checkpoints

• Whether the KOSPI’s declining trend continues and the index change rate
• Changes in the distribution of advancing, declining, and unchanged stocks on the KOSPI and KOSDAQ
• Changes in trading volume and change rates for stocks in focus, including RaonSecure and Peptron
• Whether additional disclosures are made by major companies

This article was prepared solely on the basis of the market and disclosure information for October 7, 2,026, contained in the provided FACT JSON.