--- title: "Japan, South Korea Stocks Suffer Second Rout as Kospi Plunges Over 5% Triggering Circuit Breaker, Kioxia Tumbles Over 13%, SK Hynix Falls Over 9%" type: "News" locale: "en" url: "https://longbridge.com/en/news/304401465.md" description: "On November 5, Japanese and South Korean stock markets suffered significant losses. The KOSPI plunged 5.28%, triggering a circuit breaker, while SK Hynix fell over 9%. In Japan, the Nikkei 225 dropped 1.79%, with Kioxia tumbling 13% below 10,000 yen. The sell-off was driven by risk-off sentiment, algorithmic selling, and concerns over US regulatory shocks and AI sector weakness." datetime: "2026-11-05T07:00:41.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/304401465.md) - [en](https://longbridge.com/en/news/304401465.md) - [zh-HK](https://longbridge.com/zh-HK/news/304401465.md) generator: "portal-rs" --- # Japan, South Korea Stocks Suffer Second Rout as Kospi Plunges Over 5% Triggering Circuit Breaker, Kioxia Tumbles Over 13%, SK Hynix Falls Over 9% TradingKey - Japanese and South Korean Stocks Suffer Second Bloodbath: KOSPI Plunges 5.28% Triggering Sidecar Halt, Kioxia Tumbles 13%, Losing 10,000-Yen Mark. During the Asian trading session on November 5, Japanese and South Korean stock markets retreated across the board after today's open. Following a brief morning rebound, they continued to weaken in the afternoon, triggering intraday algorithmic selling pressure and a wave of risk-off stop-loss dumping, with both markets ultimately suffering heavy losses at the close. The KOSPI Index suffered an all-day panic dive, with intraday losses widening to as much as 6%, triggering the Korea Exchange's sell-sidecar trading curb, and ultimately closed down 5.28% at 5,683.67 points; Samsung Electronics tumbled 7.57%, narrowly holding the 200,000-won mark to close at 201,500 won; SK Hynix plunged 9.46% to 1,264,000 won. KOSPI Index Chart, Source: TradingView Although the Nikkei 225 opened slightly higher in morning trade tracking an overnight rebound in U.S. equities, it was subsequently dragged down by broad weakness in AI-related heavyweights and chip equipment stocks, reversing from gains to slide steadily lower and ultimately closing down 1.79% at 61,077.85 points; Kioxia plunged 13.14%, surrendering the 10,000-yen mark to close at 9,324 yen; SoftBank tumbled 6.07%, breaking below the 4,000-yen threshold to finish at 3,980 yen. Today's second bloodbath in Asian equities has fully priced in Kioxia's warning and regulatory shocks from the U.S. midterm elections. Later today, whether U.S. stocks Micron (MU), Qualcomm (QCOM), and the Philadelphia Semiconductor Index (SOX) can demonstrate strong spot buying near the 200-day moving average will be the prerequisite for Asian equities to stem their declines tomorrow. Find out more ### Related Stocks - [KXIAY.US](https://longbridge.com/en/quote/KXIAY.US.md) - [SFTBY.US](https://longbridge.com/en/quote/SFTBY.US.md) - [SKHY.US](https://longbridge.com/en/quote/SKHY.US.md) - [SSNGY.US](https://longbridge.com/en/quote/SSNGY.US.md) - [HYNX.US](https://longbridge.com/en/quote/HYNX.US.md) - [SK.US](https://longbridge.com/en/quote/SK.US.md) - [SKDD.US](https://longbridge.com/en/quote/SKDD.US.md) - [SKHA.US](https://longbridge.com/en/quote/SKHA.US.md) - [SKHL.US](https://longbridge.com/en/quote/SKHL.US.md) - [SKHN.US](https://longbridge.com/en/quote/SKHN.US.md) - [SKHU.US](https://longbridge.com/en/quote/SKHU.US.md) - [SKHX.US](https://longbridge.com/en/quote/SKHX.US.md) - [SKHZ.US](https://longbridge.com/en/quote/SKHZ.US.md) - [SKUU.US](https://longbridge.com/en/quote/SKUU.US.md) - [07709.HK](https://longbridge.com/en/quote/07709.HK.md) - [9984.JP](https://longbridge.com/en/quote/9984.JP.md) - [YCS.US](https://longbridge.com/en/quote/YCS.US.md) - [MU.US](https://longbridge.com/en/quote/MU.US.md) - [QCOM.US](https://longbridge.com/en/quote/QCOM.US.md) ## Related News & Research - [AIA Group Ltd Purchases 17,347 Shares of SK hynix Inc. $SKHY](https://longbridge.com/en/news/304414004.md) - [6,871 Shares in SK hynix Inc. $SKHY Bought by Oppenheimer & Co. Inc.](https://longbridge.com/en/news/304092528.md) - [SK Hynix's New York chip plans hit snag over US restrictions on China, sources say](https://longbridge.com/en/news/304155678.md) - [Samsung sees chip shortage worsening, but keeps investors in suspense on returns](https://longbridge.com/en/news/303493877.md) - [SK hynix vs. Micron: One AI Memory Stock Is Worth Buying, the Other Is Worth Waiting On, Says Top Investor](https://longbridge.com/en/news/304290568.md) --- > **Disclaimer: This article is for reference only and does not constitute any investment advice.**