SEOUL – The South Korean benchmark KOSPI index took a sharp dive on Thursday, erasing previous gains as heavy selling by foreign and institutional investors outweighed a massive buying spree by retail investors. The index closed at 5,763.22, down 161.81 points or 2.73% from the previous session, according to data from the Korea Exchange (KRX).

The market opened at 5,761.40 and showed a brief moment of resilience, climbing as high as 5,863.39 during intraday trading. However, the upward momentum vanished quickly. The drop comes as a disappointment to investors who had hoped for a sustained recovery after the index briefly reclaimed the 5,900-point mark just a day prior.

Retail "Ants" Fight Uphill Battle

The day’s trading was characterized by a stark divide between investor groups. Retail investors, often referred to locally as "Ants," showed unwavering faith in the market, net-purchasing a staggering 2.41 trillion won worth of shares. This aggressive dip-buying, however, was not enough to counteract the combined exit of professional players. Foreign investors offloaded a net 1.87 trillion won, while institutional investors dumped 666 billion won, exerting downward pressure throughout the afternoon session.

Tech Giants Take a Hit but Maintain Psychological Floors

Blue-chip stocks across the board suffered significant losses. Tech behemoth Samsung Electronics saw its shares slide 3.84%, closing at 200,500 won. Despite the tumble, the company managed to stay above the psychologically significant "200,000 won" mark—a level investors have dubbed "20-man-ja."

Similarly, SK Hynix, the world’s leading memory chipmaker, fell 4.07% to end at 1,013,000 won. While the drop was steep, the stock remained above the 1 million won threshold, preserving its status as "100-man-nyx." Market analysts noted that the substantial gains recorded by these tech giants the previous day (over 5%) provided a much-needed buffer, preventing a more catastrophic breach of support levels.

Broader Market Sentiment and KOSDAQ

The bearish sentiment was not confined to the main board. The tech-heavy KOSDAQ index also retreated, finishing at 1,143.48, down 20.90 points or 1.79%. Similar to the KOSPI, the KOSDAQ was propped up solely by retail investors who net-bought 502.2 billion won. In contrast, foreign and institutional investors sold 202.6 billion won and 262.3 billion won, respectively.

Expert Outlook

"The volatility we are seeing suggests a tug-of-war between retail optimism and institutional caution," said a senior analyst at a Seoul-based brokerage. "While individual investors are betting on a long-term recovery, the heavy exodus of foreign capital indicates lingering concerns over global macroeconomic headwinds. Keeping the 5,700 level will be crucial for market sentiment in the coming sessions."

As the market grapples with this correction, eyes are now turned toward upcoming global economic indicators and central bank signals to see if the KOSPI can stabilize or if further testing of the 5,700 support zone is inevitable.