Amid significant intraday volatility in the KOSPI, a massive sell-off swept across major sectors that had recently posted large gains, including semiconductors, power equipment, defense, and construction. Among individual stocks excluding ETFs and ETNs, SK D&D was the only one to hit the lower limit, while JINHEUNG Enterprise Preferred B, GAON CABLE, MIRAE INDUSTRY, and HANMI PHARMACEUTICAL also posted double-digit declines.

■ SK D&D Plunges 29.96% to Lower Limit As of the morning of the 29th, SK D&D was trading at 3,880 won, down 1,660 won or 29.96% from the previous trading day. After opening at 4,265 won and rising to as high as 4,475 won during the session, heavy selling pressure pushed the stock down to the lower limit. Trading volume was recorded at 547,220 shares.

■ Semiconductor Equipment and Related Stocks Weaken Across the Board Semiconductor equipment maker MIRAE INDUSTRY fell 17.06% to 5,930 won. Its intraday low was 5,850 won, with a trading volume of 899,452 shares. SK HYNIX also traded 9.68% lower at 140,000 won, leading a broader weakness in semiconductor stocks.

DB HITECH dropped 11.32% to 75,200 won, HAESEONG DS fell 11.93% to 40,600 won, and KOREA CIRCUIT declined 11.63% to 41,800 won. DAEDEOK ELECTRONICS slid 11.50% to 80,800 won, KC TECH fell 9.20% to 59,200 won, and ISU PETASYS traded 8.68% lower at 65,200 won.

■ Power Equipment and Cable Stocks Hit by Profit-Taking Selloff Cable and power equipment stocks also underwent a widespread correction. GAON CABLE traded 18.12% lower at 124,300 won, and DAEWON CABLE recorded a 13.82% drop to 11,720 won. DAEHAN ELECTRIC WIRE fell 12.33% to 22,050 won, and ILJIN ELECTRIC declined 11.64% to 48,600 won.

HD HYUNDAI ELECTRIC plummeted 16.31% to 590,000 won. SANIL ELECTRIC dropped 12.83% to 127,100 won, and HYOSUNG HEAVY INDUSTRIES slid 12.05% to 2,044,000 won. This reflects a concentration of profit-taking in power equipment stocks, which had recently rallied on expectations of investment in artificial intelligence data centers and power grids.

■ Defense, Construction, Pharma, and Entertainment Among Many Sectors Declining Defense stocks were also among the steep decliners. KOREA AEROSPACE INDUSTRIES traded 15.66% lower at 120,600 won, and M&S SOLUTIONS fell 14.59% to 13,760 won. HD HYUNDAI MARINE ENGINE also recorded a 10.15% decline to 49,150 won.

Among pharmaceutical and biotech stocks, HANMI PHARMACEUTICAL traded 16.15% lower at 314,000 won. Although it rose to as high as 380,000 won during the session, increasing sell orders pushed it down to as low as 310,500 won.

In the construction sector, GS ENGINEERING & CONSTRUCTION recorded a 15.10% drop to 21,650 won. HYUNDAI ENGINEERING & CONSTRUCTION also traded 10.60% lower at 84,300 won. SAMSUNG AIR CONDITIONER fell 10.20% to 9,950 won.

HYBE traded 14.62% lower at 161,200 won. After opening at 194,200 won, it dropped to as low as 158,500 won during the session, with trading volume recorded at 562,130 shares.

■ Other Declining Stocks JINHEUNG ENTERPRISE PREFERRED B traded 20.52% lower at 1,480 won. It fluctuated between 1,700 won and 1,405 won during the session, with a trading volume of 65,775 shares.

DOOSAN FUEL CELL fell 13.80% to 20,300 won, and DOOSAN FUEL CELL 1P declined 8.52% to 3,705 won. SK ETERNIX dropped 9.75% to 43,950 won, and OCI HOLDINGS traded 4.82% lower at 175,600 won.

Among financial stocks, BNK FINANCIAL GROUP slid 14.13% to 14,830 won. In the retail sector, HANWHA GALLERIA fell 3.87% to 1,715 won, and KOREA AIRPORT recorded a 1.01% decline to 78,800 won.

[This article is not intended to recommend the purchase or sale of any specific stock. Stock prices in the market can fluctuate sharply depending on corporate performance, supply and demand, and market conditions, so investment decisions and responsibilities lie with the investor. Intraday stock prices and fluctuation rates included in the article may vary depending on the time of writing. This article was written with AI assistance.]