On the 9th, a circuit breaker was triggered on the stock market. The KOSPI index was showing a plunge of more than 8% that morning.

On the 9th, a board in the Hana Bank dealing room in Jung-gu, Seoul displays market indicators such as the KOSPI. The KOSPI opens at 5,265.37, down 319.50p (5.72%) from the previous transaction day; the KOSDAQ at 1,096.48, down 58.19p (5.04%); and the won–dollar exchange rate at 1,492.0 won, up 17.4 won. /Courtesy of News1

Korea Exchange (KRX) triggered a circuit breaker at about 10:31 a.m. that day. The KOSPI index fell more than 8% from the previous day and the drop persisted for 1 minute, halting stock market trading for 20 minutes.

The KOSPI index fell 8.10% (452.80 points) from the previous trading day to 5,132.07. It was the first circuit breaker in five days.

Earlier that morning, a sell-sidecar (temporary suspension of program sell quotes) was also triggered on both the KOSPI and KOSDAQ markets.

The exchange disclosed that at about 9:06 a.m. that day, it triggered a sell-sidecar on the KOSPI market. It was the first sell-sidecar on the KOSPI in three trading days, since on the 4th.

At 10:31 a.m. that day, a sell-sidecar was triggered on the KOSDAQ market. It said that due to movements in the KOSDAQ150 futures prices and the cash index, the effectiveness of program sell quotes would be suspended for five minutes.

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