The KOSPI crossed the circuit-breaker line on two consecutive days
Reuters reported that the KOSPI closed at 6,023.66 on July 28, down 732.09 points or 10.84%. It fell as much as 11.3% intraday and triggered a Level 1 circuit breaker. Foreign investors were large net sellers and semiconductor stocks were under heavy pressure, but those figures alone do not prove that one cause moved the entire market.
On July 29, the index again fell more than 8% intraday before closing 6% lower at 5,663.24, according to AP. Yonhap separately reported the regular KOSPI market’s Level 1 trigger at 12:31 p.m., while NXT’s official list records its own KOSDAQ halt from 12:19 to 12:49 and KOSPI halt from 12:32 to 1:02. Times from different venues, an intraday trigger, and the closing loss should not be merged into one figure.
Chip concentration mattered, but there was no single confirmed cause
Reuters pointed to the global semiconductor selloff and concerns about competition from a Chinese memory maker as part of the July 28 backdrop. AP linked the next day’s pressure to renewed AI-stock selling and SK Hynix operating profit that grew sharply but fell short of analyst expectations. Those are reported market explanations, not an official determination of one cause.
Index structure helps explain why the move looked so broad. An FSC paper published July 16 put Samsung Electronics and SK Hynix at a combined 52% of KOSPI market capitalization on July 15, up from 34% at the end of 2025. Large simultaneous moves in those two constituents can therefore have an outsized effect on the benchmark, even for investors who do not own either stock directly.
A sidecar pauses one side of program quotes; a circuit breaker pauses the market
Under KRX rules, a KOSPI sidecar suspends the validity of program-buy quotes for five minutes after an upward futures trigger, or program-sell quotes after a downward trigger. It does not stop every program order or every retail stock order across the market.
A Level 1 KOSPI circuit breaker is triggered when the index remains at least 8% below the previous close for one minute. Trading is halted for 20 minutes. New orders cannot be submitted during the halt, while existing orders may be cancelled; resumption begins with a call auction before continuous trading returns. Broker apps may label those states differently, so the order log and broker notice matter more than a spinning price screen.
The entry requirement for single-stock leveraged products changes on July 31
At its July 28 industry meeting, the FSC reiterated that new listings and advertising for single-stock leveraged products had been suspended and that a stronger deposit requirement would begin July 31. Retail investors making a new or additional purchase must hold KRW 30 million in cash for the basic deposit requirement.
The earlier framework recognized at least KRW 10 million including part of the value of eligible stocks, ETFs, and bonds. Those substitute securities will no longer count for this product category. Cash raised by selling securities is recognized after settlement at T+2, while a loan secured by unsettled sale proceeds is excluded. Existing ownership and eligibility to add to the position after July 31 are separate questions; the broker’s current account notice remains the final operational check.
For ETFs and ETNs, separate structure, reference value, and quotes
In a fast market, either product can trade away from its reference value, but their structures differ. An ETF is a fund with net asset value, while an ETN is an unsecured note issued by a securities firm and carries issuer credit risk as well as index-tracking risk. The FSC has announced tighter premium-and-discount controls and a faster watch-designation process.
A leveraged product is generally reset to target a multiple of the underlying asset’s daily return. Its multi-day result is not a simple plus-or-minus-two-times calculation, and compounding can create a large gap when prices swing back and forth. Before ordering, read the exposure, multiple, reset period, and ETN issuer risk, then compare NAV or indicative value, the premium or discount, and both sides of the liquidity provider’s quotes.
The useful question is exposure, not whether the bottom is in
An ordinary chip stock, a semiconductor index fund, and a leveraged product tied to the same company can create overlapping exposure under different names. Listing each holding’s underlying asset and intended multiple is more informative than adding only the account values.
Use time-stamped KRX and NXT notices, company disclosures, and FSC updates instead of social posts promising a rebound. A market reopening only means that trading resumed under the exchange rule; it does not signal that volatility has ended or that losses will recover.
One last check
Five checks before placing another order
- 01
Open the order log in your broker app and distinguish accepted, cancelled, rejected, and filled orders.
- 02
Confirm whether you own an ordinary share or a single-stock leveraged ETF or ETN with a different exposure.
- 03
For an ETF or ETN, compare the traded price with NAV or indicative value, the premium or discount, and both sides of the order book.
- 04
For a new or additional purchase after July 31, verify the KRW 30 million cash-deposit rule and T+2 treatment with your broker.
- 05
Map overlapping exposure across chip stocks, sector funds, and leveraged products before reacting to the index move.
Sources
Sources used for this article
- NXT — Official notices for sidecars, circuit breakers, and resumptions on NXT
- Korea Exchange — KOSPI circuit-breaker thresholds and resumption process
- Korea Exchange — KOSPI program-trading sidecar rules
- Financial Services Commission — July 28 meeting on single-stock leveraged products
- Financial Services Commission — July 31 cash deposit requirement
- Financial Services Commission — Product safeguards and KOSPI concentration data
- Financial Services Commission — Daily reset and compounding risks in single-stock leverage
- Korea Exchange — ETN structure and issuer credit risk
- Reuters — July 28 KOSPI close and semiconductor selloff
- AP — July 29 KOSPI close and regional market context
- Yonhap — July 29 regular-market circuit-breaker trigger time
Sources checked after the July 29, 2026 close. July 28 closing figures come from Reuters and July 29 figures from AP. NXT halt and resumption times are identified only as records for NXT’s own venue; regular-market process and policy descriptions come from KRX and the FSC. Reported chip and earnings concerns are presented as market context, not a proven single cause. The article images are editorial concepts, not real trading screens, account records, or evidence of returns.
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