[Edaily Reporter KIM YOON-JEONG ] The KOSPI rose more than 2% in early trading on the 21st, partially recovering from the previous day’s sharp decline. Overnight, international oil prices and U.S. Treasury yields fell in the U.S. stock market, and U.S. semiconductor stocks showed strength in after-hours trading, leading to buying interest in major domestic semiconductor stocks. SamsungElectronics and SK hynix are both rising by 2–3%, driving the index’s rebound.

According to MP Doctor, as of 9:06 a.m. today, the KOSPI stands at 5,672.13, up 119.39 points (2.15%) from the previous trading day. The index opened at 5,666.34, up 113.60 points (2.05%) from the previous close.
By investor type, retail investors are net buyers of 51.8 billion won. In contrast, foreign and institutional investors are net sellers of 23.4 billion won and 48.0 billion won, respectively.
Overnight, the New York stock market closed mixed. On the 20th (local time), the Dow Jones Industrial Average rose 1.02% and the S&P 500 index rose 0.28%, while the tech-heavy Nasdaq index fell 0.02%.
International oil prices fell and U.S. Treasury yields declined amid expectations of resumed talks between the U.S. and Iran, which bolstered investor sentiment. West Texas Intermediate (WTI) crude oil futures closed at $101.79 per barrel, down 1.8%, and the yield on the 10-year U.S. Treasury note fell to 5.11%.
U.S. semiconductor stocks were weak during regular trading hours, but the mood shifted in after-hours trading. Han Ji-young, an analyst at KIWOOM Securities, explained, “Supermicro Computer (SMCI), an artificial intelligence (AI) server manufacturer, reported preliminary first-quarter revenue that exceeded market expectations, delivering a positive surprise.” She added, “The stock is surging by over 13% in after-hours trading, and other semiconductor stocks, such as Micron and SanDisk, are also showing gains of more than 2% in after-hours trading.”
She further elaborated, “We expect the domestic stock market today to recover from yesterday’s sharp decline, driven by technical buying following yesterday’s 3% plunge, easing pressure from oil prices and interest rates, and the after-hours strength in U.S. semiconductor stocks following Supermicro’s earnings surprise.”
By sector, most are showing gains. The electrical and electronics sector is leading the rally with a 3.95% increase, while manufacturing (3.11%), medical and precision instruments (2.99%), construction (2.47%), securities (2.29%), retail (1.57%), machinery and equipment (1.55%), and pharmaceuticals (1.47%) are also rising. In contrast, sectors such as metals (-1.14%), textiles and apparel (-0.56%), real estate (-0.41%), and transportation and warehousing (-0.39%) are trading lower.
Among the top stocks by market capitalization, SamsungElectronics(005930), the company with the largest market cap, is trading at 217,000 won, up 5,500 won (2.60%) from the previous trading day. SK hynix(000660), the second-largest by market cap, is trading at 1,267,000 won, up 44,000 won (3.60%).
SamsungElectronics(1P)(005935)(3.56%), SKSQUARE(402340)(2.70%), Celltrion(068270)(2.08%), SAMSUNG BIOLOGICS(207940)(1.65%), Samsung Life Insurance(032830)(0.84%), SamsungElectroMechanics(009150)(0.52%), and HyundaiMotor(005380)(0.16%) are also rising. On the other hand, KB Financial Group(105560)(-0.56%) and LG Energy Solution(373220)(-0.36%) are falling.
The KOSDAQ market is also rising. At the same time, the KOSDAQ index stands at 793.33, up 11.36 points (1.45%) from the previous trading day. The index opened at 793.40, up 11.43 points (1.46%) from the previous close.
On the KOSDAQ, retail investors and institutional investors are net buyers of 17.1 billion won and 10.2 billion won, respectively. In contrast, foreign investors are net sellers of 25.7 billion won.
Alteogen Inc.(196170), the company with the largest market capitalization, is trading at 241,000 won, up 10,000 won (4.33%) from the previous trading day. ECOPRO CO., LTD(086520), the company with the second-largest market capitalization, is trading at 84,200 won, up 800 won (0.96%).
ECOPRO BM CO., LTD.(247540) SAM CHUN DANG PHARM CO. LTD(000250)(up 3.99%), (up 2.44%), (up 2.22%), (up 1.07%), (up 0.78%), and (up 0.44%) are also showing gains. On the other hand, (down 0.89%), (down 0.58%), and (down 0.40%) are trading lower. JUSUNG ENGINEERING Co.,Ltd.(036930) EO Technics Co., Ltd.(039030) WONIK IPS Co.,Ltd.(240810) LEENO Industrial Inc(058470) SIMMTECH Co., Ltd.(222800) HLB INC.(028300) Rainbow Robotics(277810)