{"id":441597,"date":"2026-11-05T09:40:05","date_gmt":"2026-11-05T02:40:05","guid":{"rendered":"https:\/\/www.swingfish.trade\/blog\/market-news\/sidecars-and-exam-days-two-korean-market-quirks-explained-as-the-kospi-slides-4-441597\/"},"modified":"2026-11-05T09:40:05","modified_gmt":"2026-11-05T02:40:05","slug":"sidecars-and-exam-days-two-korean-market-quirks-explained-as-the-kospi-slides-4","status":"publish","type":"post","link":"https:\/\/www.swingfish.trade\/blog\/market-news\/sidecars-and-exam-days-two-korean-market-quirks-explained-as-the-kospi-slides-4-441597\/","title":{"rendered":"Sidecars and exam days: two Korean market quirks explained as the KOSPI slides 4%"},"content":{"rendered":"<div>\n<p dir=\"ltr\">A sidecar on a 4% down day signals forced or automated selling at pace, and traders will watch whether the pause steadies futures or merely delays further losses. Korea\u2019s heavy weighting in chipmakers leaves it exposed to any extension of the overnight rotation out of AI-linked stocks, with knock-on effects for regional tech and the won. A weaker won could add to the pressure if foreign investors keep selling. <\/p>\n<p dir=\"ltr\">The November 19 timetable is a minor liquidity consideration, but one that can catch out overseas desks used to the normal opening time.<\/p>\n<p dir=\"ltr\">&#8212;<\/p>\n<p dir=\"ltr\">\nKorea hit the brakes on its trading algorithms today, and in two weeks it will hit pause for its students.<\/p>\n<p dir=\"ltr\">Summary:<\/p>\n<ul dir=\"ltr\">\n<li>The KOSPI fell around 4% on Thursday, and a sidecar briefly suspended program trading tied to KOSPI 200 futures<\/li>\n<li>A sidecar halts program orders for five minutes when futures move sharply and stay there for a minute; normal trading continues<\/li>\n<li>The slide coincided with an overnight selloff in AI and chip stocks on Wall Street<\/li>\n<li>On November 19, KOSPI and KOSDAQ trading will open at 10:00 local time (01:00 GMT) and close at 16:30 (07:30 GMT), an hour later than usual<\/li>\n<li>The delay is for the Suneung university entrance exam, when offices start late, flights pause and police help students reach exam halls<\/li>\n<\/ul>\n<p dir=\"ltr\">\nSouth Korea\u2019s stock market offered a crash course in two of its more unusual mechanisms on Thursday. As the KOSPI slid around 4%, a \u201csidecar\u201d briefly paused automated trading, while the exchange announced it will open an hour late later this month so students can get to their university entrance exams on time.<\/p>\n<p dir=\"ltr\">The sidecar came first. It is a circuit breaker for program trading: when KOSPI 200 futures move sharply against the previous close and stay there for a minute, the exchange suspends computer-driven program orders for five minutes. On the main board the trigger is a 5% move. Ordinary trading continues, but the pause is designed to stop automated selling or buying from feeding on itself during a fast market. A sidecar can only be triggered once a day.<\/p>\n<p dir=\"ltr\">Thursday\u2019s slide coincided with a <a href=\"https:\/\/investinglive.com\/stocks\/dow-surges-1-570-points-as-investors-rotate-out-of-ai-and-chip-stocks\/\" rel=\"follow\">sharp selloff in AI and chip stocks on Wall Street overnight<\/a>, a theme that weighs heavily on Korea given the index\u2019s exposure to semiconductor makers.<\/p>\n<p dir=\"ltr\">The second quirk is gentler. The Korea Exchange said trading on the KOSPI and KOSDAQ will start at 10:00 local time on November 19 (01:00 GMT, or 20:00 ET on November 18), an hour later than usual, and close at 16:30 (07:30 GMT, 02:30 ET). After-hours trading will also shift an hour later, running from 17:00 to 20:00.<\/p>\n<p dir=\"ltr\">The reason is the Suneung, the national university entrance exam, which is treated as close to a national event. Results play a major role in which universities students can enter, and with around half a million candidates sitting it each year, the country rearranges itself around the day. Government offices and many companies delay their start times to keep roads clear, aircraft take-offs and landings are typically halted during the English listening section, and police stand by to rush late students to exam halls.<\/p>\n<p dir=\"ltr\">For investors trading Korea from overseas, both are worth knowing. A sidecar is a signal that futures are moving fast, while the exam-day timetable shifts when Korean price action feeds into the rest of the Asian session.\u00a0<\/p>\n<p dir=\"ltr\">\n<p>                            This article was written by Eamonn Sheridan at investinglive.com.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>A sidecar on a 4% down day signals forced or automated selling at pace, and traders will watch whether the pause steadies futures or merely delays further losses. Korea\u2019s heavy weighting in&hellip;<\/p>\n","protected":false},"author":216,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-441597","post","type-post","status-publish","format-standard","hentry","category-market-news"],"_links":{"self":[{"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/posts\/441597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/users\/216"}],"replies":[{"embeddable":true,"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/comments?post=441597"}],"version-history":[{"count":0,"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/posts\/441597\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/media?parent=441597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/categories?post=441597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.swingfish.trade\/blog\/wp-json\/wp\/v2\/tags?post=441597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}