The KOSPI fell 10.84% on July 28 and another 5.98% on July 29. This was more than ordinary profit-taking. Heavy index concentration in Samsung Electronics and SK hynix collided with large foreign selling, forced reductions in margin and leveraged positions, and pressure from U.S. technology stocks and bond yields.
The July 29 close of 5,663.24 was still 34.39% above the start of the year. The useful question is therefore not whether the entire bull market has ended. It is how far earnings expectations have reset and when price-insensitive forced selling begins to fade.
Key Takeaways
The central cause was simultaneous foreign selling and forced deleveraging in an index dominated by two semiconductor companies.
| Item | Figure | Meaning |
|---|---|---|
| July 28 | 6,023.66 / -10.84% | Circuit breakers were triggered as the intraday loss exceeded 11% |
| July 29 | 5,663.24 / -5.98% | A second steep loss despite a partial recovery from the intraday low |
| Five sessions | -16.69% | Momentum and volatility deteriorated together |
| Year to date | +34.39% | Part of the earlier annual gain remained after the selloff |
What Changed Between July 28 and July 29?
The first day was the initial shock from the index’s two largest semiconductor stocks. SK hynix fell 14.7% and Samsung Electronics about 13.4% on July 28. Only 36 stocks advanced while 878 declined. Foreign investors sold roughly 5 trillion won net, while retail investors bought about 4 trillion won.
On the second day, lower prices created collateral shortages and tighter risk limits. When bids are thin, margin accounts and leveraged funds cannot choose an ideal exit price. The KOSPI was down more than 12% intraday on July 29 before closing down 5.98%, a pattern consistent with liquidity stress and position liquidation as well as fundamental news.
Source: Reuters – July 28 KOSPI selloff and flows
Why Was the KOSPI Hit So Hard?
First, semiconductor concentration is unusually high. As of July 28, the RISE KOSPI ETF assigned 27.78% to Samsung Electronics and 24.22% to SK hynix. If both stocks fall by double digits, strength in smaller sectors cannot easily stabilize the index.
Second, the advance into the June peak was very fast. The KOSPI reached 9,114.55 as AI-memory growth and a Korea re-rating were priced in aggressively. Elevated expectations make even a modest earnings miss or a new competitive threat capable of triggering a large valuation reset.
Third, the U.S. technology correction and China-related semiconductor reports pushed in the same direction. Questions about AI returns, lower-cost Chinese AI models, and possible progress in lithography and memory lowered the market’s long-term margin assumptions for Korean chipmakers. Commercial viability is not fully proven, but uncertainty alone can matter when valuations are stretched.
Fourth, derivatives and credit flows followed the cash-market decline. Rising volatility and collateral requirements force investors to reduce risk across holdings, often before separating strong companies from weak ones. That mechanism amplified the second day’s decline.
Source: Reuters – leverage and July 29 volatility
Does the Selloff Confirm a Recession or Bear Market?
Not yet. The immediate evidence points more strongly to an earnings-expectation reset and a concentrated market structure than to a sudden collapse in Korean exports or aggregate corporate profit. The KOSPI also remained positive for the year as of July 29.
It would be equally risky to dismiss the move as only technical. Deleveraging can persist for several sessions, and sustained high oil prices and long-term yields could eventually weaken earnings outside semiconductors. The key is whether a positioning shock begins to alter fundamentals.
- Look for broader participation rather than an index-only rebound
- Check whether foreign cash and futures selling slow together
- Watch whether Samsung and SK hynix begin making higher intraday lows
- Prefer closes near the session high on normal or strong turnover
Source: AP – global markets on July 29
Outlook: A Bounce Is Possible, but a Bottom Needs Confirmation
A technical rebound can occur at any time after losses of this magnitude. Still, one large up day is weaker evidence than two or three sessions of improving foreign flows, semiconductor earnings expectations, and market breadth.
The bullish path requires stabilization in U.S. chip stocks, limited downward revisions for Samsung and SK hynix, and an end to sustained foreign outflows. The base path is an index rebound led by only a few large stocks while volatility remains high. The bearish path develops if oil and yields rise further and forced selling retests the lows.
Source: RISE ETF – KOSPI constituent weights
Three Paths From Here
| Path | Confirmation |
|---|---|
| Bull | Semiconductor stabilization, foreign buying, and broader participation |
| Base | A reflex rebound with persistent volatility and megacap concentration |
| Bear | Higher oil and yields extend deleveraging and force a retest |
What to Monitor
| Indicator | What it shows |
|---|---|
| Foreign cash and futures flows | Whether selling slows in both markets |
| Samsung and SK hynix | Whether intraday lows and turnover stabilize |
| Market breadth | Whether more stocks participate in a rebound |
| Margin balances | Whether forced liquidation pressure is easing |
| U.S. 10-year yield and oil | Whether discount-rate pressure on growth stocks moderates |
FAQ
Has the two-day plunge confirmed a KOSPI bear market?
No. The drawdown from the June peak is severe, but the index remained positive year to date. Trend, earnings revisions, and foreign flows need to deteriorate together before that conclusion is justified.
Why do Samsung and SK hynix move the index so much?
Their combined index weight exceeded half in the cited ETF snapshot, so a synchronized move can dominate gains or losses in other sectors.
Is buying immediately after the plunge attractive?
A rebound and further forced liquidation are both possible. Volume, foreign flows, defense of prior lows, and earnings revisions matter more than price alone.
What is the first confirmation signal?
A simultaneous stabilization in foreign cash and futures flows and in Samsung and SK hynix. Broader market participation would strengthen the evidence.
Public Sources
- Reuters – July 28 KOSPI selloff and flows
- Reuters – leverage and July 29 volatility
- AP – global markets on July 29
- RISE ETF – KOSPI constituent weights
This analysis summarizes market structure and confirmation signals from public information. It is not a recommendation to buy or sell any security.
