KOSPI Plunges 8% Triggering Circuit Breaker: Causes of Foreign/Institutional Sell-off and When Will It Rebound?

On the 23rd, the KOSPI index plunged more than 8% intraday, dragged down by heavy selling from foreign and institutional investors, triggering a circuit breaker that temporarily halted trading. The index quickly retreated to the 8,400 level, spreading extreme fear throughout the broader market.

Background of the 8% KOSPI Plunge and Circuit Breaker

The main driver behind this stock market shock is the weakness in US tech stocks and the resulting global risk aversion sentiment. Specifically, as the tech-heavy Nasdaq index fell 1.3% overnight due to skepticism over the profitability of AI infrastructure investments and the steep drop of major companies like SpaceX, selling pressure on large domestic tech stocks, particularly semiconductors, intensified significantly.

Massive profit-taking from foreign and institutional investors poured into top market-cap stocks, including Samsung Electronics and SK Hynix, which had recently hit all-time highs. Because the KOSPI market had a strong 'semiconductor concentration', it absorbed the US-driven shock directly, leading the index downward. Although retail investors stepped in with massive net purchases in the trillions of won to defend the downside, it was insufficient to absorb the overwhelming selling volume.

Future Stock Market Outlook and Rebound Timing

Experts forecast that the KOSPI market's volatility will widen significantly for the time being. Until clear profitability from US Big Tech companies is proven, it will be difficult to expect a distinct inflow of foreign capital. However, the possibility of a technical rebound due to the excessive short-term drop remains open, so investors should closely monitor whether the key support level of 8,300 is breached.

Key Q&A (FAQ)

Q1. What is a circuit breaker, and what happens when it is triggered?

A circuit breaker is a system that temporarily halts stock trading to mitigate market shock when stock prices fluctuate sharply. In the KOSPI market, a Level 1 circuit breaker is triggered if the index falls by 8% or more from the previous day's close and sustains that level for 1 minute, pausing all stock transactions for 20 minutes.

Q2. How should retail investors respond right now?

During periods of extreme market volatility, it may be advantageous to avoid hasty bottom-fishing (averaging down), maintain a high cash proportion, and take a wait-and-see approach. Especially for portfolios heavily concentrated in the semiconductor sector, the focus should be on risk management until the global tech stock trend stabilizes.