6500, Korean stocks are approaching a critical level.

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The South Korean stock market is standing on a technically dangerous edge.

The KOSPI index plunged nearly 9% on Monday, closing near 6,800 points, triggering circuit breakers for the seventh time since 2026. Foreign and domestic institutions net sold over $2.6 billion. If the current support is breached, the next key technical level at 6,500 points will become the market’s focus.

This plunge was triggered by Middle East tensions and technology stock sell-offs, but the Korea trading desk at Goldman Sachs pointed out in its flow report that the real amplifier was the rapid deleveraging of newly launched single-stock leveraged ETFs—related semiconductor 2x leveraged products fell more than 30% in one day, and the passive rebalancing triggered by this accounted for 62% of domestic institutions’ net selling.

Chris Cha of Goldman Sachs Korea trading desk clearly stated in the report that today’s market action was position-rebalancing sell-off, not structural topping. However, for investors, the most urgent question is: Can 6,800 points hold, and if not, how much downward pressure will the market face?

Circuit breaker triggered again, tech heavyweight stocks lead the decline

KOSPI triggered a level-1 circuit breaker during Monday trading, pausing trading for 20 minutes, then closed at 6,800 points, breaching the psychological 7,000-point threshold.

The early drop was sparked by escalating tensions between the US and Iran near the Strait of Hormuz, but losses accelerated due to aggressive unwinding of highly concentrated tech heavyweight stocks.

SK Hynix fell 15.4% in a single day, Samsung Electronics fell 10.7%.

Goldman’s report specifically emphasized that the memory chip industry has not experienced any negative fundamental catalysts or downward revisions of earnings expectations, indicating that this sell-off is essentially driven by position adjustments by index giants, not a sign of fundamental deterioration.

Leveraged ETFs as amplifiers, regulatory pressure follows

The main driver behind this extreme volatility was the recently listed single-stock leveraged ETFs.

Such products are forced to conduct aggressive gamma hedging rebalancing when the market falls, forming a self-reinforcing downward spiral. Semiconductor-linked 2x leveraged ETFs fell more than 30% in a day, and the chain liquidations triggered accounted for 62% of domestic institutions’ net selling.

Meanwhile, Lee Cheon-han, head of the Korea Financial Supervisory Service, held a meeting with CEOs of 20 major asset management firms on the same day, expressing strong concerns about the systemic risk and "overheated" marketing of these products, and called for enhanced consumer protection.

The Goldman report notes that regulatory focus is expected to be on raising investor entry thresholds rather than directly banning products, and no specific measures have yet been introduced.

Passive selling dominates, long-term institutions stay put

Foreign investors and domestic institutions net sold $1.13 billion and $1.5 billion, respectively, on the day.

It is notable that the foreign selling was almost entirely passive, with algorithmic trading accounting for $1.18 billion net outflow.

Observations by Goldman’s high-touch trading desk confirm this feature: despite the sharp index drop, block trading activity among institutions was surprisingly light. Momentum-driven hedge funds made selective sales, while long-term institutions (LOs) overall remained silent. This flow structure indicates there was no systematic withdrawal of long-term funds from the market.

6,500 is the next line of defense

Technically, KOSPI’s closing was exactly at the 6,800-point support, which matches the 52-week Fibonacci level, and remains within the downward channel that began mid-June.

Goldman’s report notes that if the 6,800-point support is lost, the next direct support is at 6,500 points, corresponding to the 3-year 38.2% Fibonacci retracement and representing an extra 4.5% downside from the current closing level. Below that is the 6,100-6,000 range, representing a 10%-12% drop from today’s closing price.

The report also notes that KOSPI’s one standard deviation of volatility is 2.8%, but lately, the index has tended to swing more than 2 standard deviations, so the area near 6,000 points may provide stronger support. Also, KOSPI’s 14-day RSI has dropped to 37.2, nearing the oversold zone.

Sentiment diverges from fundamentals, Goldman recommends buying the dip

There is a clear divergence between today’s aggressive selling and institutional investors’ fundamental assessment. According to feedback collected by Goldman’s sales team during last week’s Singapore roadshow, institutions generally believe the recent correction has created highly attractive risk-reward ratios, and some clients have begun rebuilding exposure to memory chips.

The bullish camp’s core logic is based on structural equipment shortages—expected to delay industry capacity expansion to the second half of 2028, which will provide fundamental support for the semiconductor cycle. A minority of bears are concerned about a drop in average selling prices in Q4 2026 and the HBM4 cycle peaking.

Over a longer cycle, foreigners have net sold $71.5 billion in the past three months, 88% of which was concentrated in technology, with global positions significantly lightened. Goldman’s report believes forward EPS expectations remain firm during the price correction and this sell-off is a liquidity-driven purge of positions rather than a structural cyclical top, recommending investors take advantage of this extreme volatility to selectively accumulate high-conviction memory and tech stocks at discounted valuations.

In the short term, there is no sign that foreign mechanical unwinding has abated, domestic institutions are constrained by fund limitations (National Pension Service continues portfolio rebalancing), and swap financing costs, though down slightly from their peak, remain high—headwinds in the market persist. 6,500 points is becoming the next true battleground between bulls and bears.

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