KOSPI plunges 3.73%…SK hynix and Samsung Electronics both decline

The KOSPI closed at 5,552.74, down 3.73% from the previous trading day. Declining stocks outnumbered advancing stocks in both the KOSPI and KOSDAQ, while trading value was approximately 25 trillion won and 6.6 trillion won, respectively.

Market at a Glance

The KOSPI fell 3.73% to 5,552.74. Of the 888 stocks on the KOSPI, 116 rose, 754 fell, and 18 were unchanged. Of the 1,714 KOSDAQ stocks, 373 rose, 1,300 fell, and 41 were unchanged, with declining stocks predominating. The average change rates were -2.60% for the KOSPI and -2.24% for the KOSDAQ. By investor type, foreign investors and institutions were net sellers while individuals and other investors were net buyers in the KOSPI. In the KOSDAQ, foreign investors, institutions, and other investors were net sellers, while individuals were net buyers.

Korea market daily snapshot for 20261020

Market Leaders

SK hynix, one of the leading stocks by trading value, fell 8.81% to 1.19 million won. Trading volume was 5.2 million shares, trading value was approximately 6.3662 trillion won, and its change rate over the past five trading days was -18.27%. Samsung Electronics fell 6.49% to 209,000 won. Trading volume was 27.18 million shares, trading value was approximately 5.7856 trillion won, and its change rate over the past five trading days was -10.68%.

Stocks in Focus

HT Robotics rose 9.32% to 9,970 won. Trading volume was 28.72 million shares, or 3.55 times its 20-day average, and its change rate over the past five trading days was 58.76%. Hanwha Systems fell 14.60% to 69,600 won, with trading volume of 2.83 million shares and a trading-volume ratio of 1.89 times its 20-day average. Hyundai Rotem fell 14.36% to 85,300 won. Trading volume was 1.78 million shares, the trading-volume ratio versus its 20-day average was 3.29 times, and its change rate over the past five trading days was -12.06%.

Key Filings

Recent filings included Samsung Electronics’ “Report on the Ownership Status of Specific Securities, etc. by Executives and Major Shareholders” and an HT Robotics filing with the same title. Hanwha Systems filed “Provision of Collateral to Related Parties” and “Investment in Related Parties.” Hyundai Rotem filed “Report on Major Matters (Decision to Acquire Treasury Shares)” and “[Amendment] Conclusion of a Single Sales and Supply Contract,” among others. SK hynix filed “Holding of Corporate Briefing (IR) (Notice Filing).”

  • 한화시스템 · 특수관계인에대한담보제공 (272210) — View DART filing
  • 한화시스템 · 특수관계인에대한출자 (272210) — View DART filing
  • 삼성전자 · 임원ㆍ주요주주특정증권등소유상황보고서 (005930) — View DART filing
  • 현대로템 · 주요사항보고서(자기주식취득결정) (064350) — View DART filing
  • 현대로템 · [기재정정]단일판매ㆍ공급계약체결 (064350) — View DART filing
  • SK하이닉스 · 기업설명회(IR)개최(안내공시) (000660) — View DART filing

Next Trading Day Checkpoints

  • Whether the upward trend continues after the KOSPI’s close at 5,552.74
  • Changes in the distribution of advancing, declining, and unchanged stocks in the KOSPI and KOSDAQ
  • Changes in trading volume and trading value for SK hynix and Samsung Electronics
  • Whether additional filings are made by major stocks
This article is based solely on the price, trading, investor-flow, and filing facts provided in the FACT JSON and contains no investment solicitation or outlook.

Recent reports on this topic

2026-10-19KOSPI Closes 1.76% Higher…Samsung SDI Surges 11.49%2026-10-16KOSPI Closes Up 2.05%…Samsung Electronics Gains 4.58%, HT Robotics Surges2026-10-15KOSPI Plunges 7.57%…Trading Concentrated in Samsung Electronics and SK hynix2026-10-14KOSPI Falls 0.44% to 6,008.81… HMM and Samsung SDI Rise2026-10-13KOSPI Plunges 5.46%…SK hynix and Samsung Electronics Both Decline
All reportsMOINARY Home