All NewsEducationTV
Equities & FundsCrypto & Digital AssetsAI & TechnologyBusiness & CorporateUS Politics & PolicyGeopolitics & Global RiskMacro, Rates & FXCommodities & EnergyEuropean Politics & MarketsAsia-PacificReal Estate & Property
Story archiveAll categories
← All Stories

KRX activates sell-side sidecar for KOSPI amid sharp fall

Created at 19 Aug · 12:21 AM1 source↑ Market-relevant
IN SHORT

South Korea's bourse operator, KRX, activated a sell-side sidecar for the KOSPI index on Wednesday, suspending program trading for five minutes as the index fell sharply. The move was triggered by a 5% or more drop in the KOSPI 200 Futures Index.

Key Numbers

5.6 percentKOSPI fall
384.82 pointsKOSPI points lost
6,485.01KOSPI index level
five minutesprogram trading suspension
09:06 a.m.trading suspension start time
5 percentfutures index trigger threshold

Who's Involved

KRX
South Korea's bourse operator
Samsung Electronics
semiconductor share issuer
SK hynix
semiconductor share issuer
KRX activates sell-side sidecar for KOSPI amid sharp fall

↳ Why This Matters

The activation of a sell-side sidecar indicates significant market volatility and a rapid decline in stock prices, prompting regulatory intervention to stabilize trading.

Key facts

  • South Korea's bourse operator, KRX, activated a sell-side sidecar for the KOSPI.
  • The sell-side sidecar was triggered by a sharp fall in the KOSPI index.
  • Program trading for KOSPI-listed shares was suspended for five minutes.
  • The KOSPI fell 5.6 percent to 6,485.01 as of 09:07 a.m.
  • Investors sold off semiconductor shares, including Samsung Electronics and SK hynix.
  • The sidecar is triggered when the KOSPI 200 Futures Index falls 5 percent or more for at least one minute.

South Korea's benchmark Korea Composite Stock Price Index (KOSPI) experienced a sharp decline, prompting the Korea Exchange (KRX) to activate a sell-side sidecar. Program trading for KOSPI-listed shares was suspended for five minutes starting at 09:06 a.m. on Wednesday. The KOSPI opened 4.96 percent lower and subsequently lost 384.82 points, or 5.6 percent, to trade at 6,485.01 as of 09:07 a.m. The sell-off was driven by investors selling semiconductor shares, including those of Samsung Electronics and SK hynix, mirroring overnight losses on Wall Street. These losses were attributed to stalled U.S.-Iran peace talks, which led to increased oil prices and bond yields. A sell-side sidecar is automatically triggered when the KOSPI 200 Futures Index falls by 5 percent or more for a duration of at least one minute.

Frequently asked questions

A sell-side sidecar is a trading mechanism activated by a stock exchange to temporarily halt program trading when the market experiences a sharp decline, aiming to prevent excessive volatility.

The sell-side sidecar was triggered because the KOSPI 200 Futures Index fell 5 percent or more for at least one minute.

Semiconductor shares, including Samsung Electronics and SK hynix, were among those sold off by investors.

What Happens Next

01Trading is expected to resume after the five-minute suspension.
02Market participants will monitor further developments in U.S.-Iran peace talks and their impact on oil prices and bond yields.
CME Headlines
  • Equity Index futures drop as 30-year bond yield hits 5.33%. 8/18/26
    18 Aug · 9:13 PM
  • Equity Index futures drop as 30-year bond yield hits 5.33%. 8/18/26
    18 Aug · 9:13 PM
  • SPAN 2 Framework Equity Model Parameter Changes - Effective August 18, 2026
    17 Aug · 8:45 PM

How It Developed

The KOSPI opened 4.96 percent lower.
Program trading for KOSPI-listed shares was suspended for five minutes.
The KOSPI lost 384.82 points, or 5.6 percent, to 6,485.01.

Sources

T1
KRX activates sell-side sidecar for KOSPI on sharp fallYonhap News Agency

Related Stories

Seoul shares open sharply lower, snapping 5-day rally
18 Aug · 6:56 AM
Tech stocks drag Wall Street lower as bond yields surge
18 Aug · 11:37 PM
Kalshi seeks CFTC approval for S&P 500 perpetual futures
18 Aug · 12:21 PM
Mark Walter's insurers to cut $6.5B in investments amid fraud probe
18 Aug · 1:42 PM
Home Depot beats quarterly sales estimates on steady repair demand
18 Aug · 10:05 AM