--- title: "SK Hynix Stock Drops 7.82% in Seoul as KOSPI Suffers Brutal Rout: Brent Above $90, Trump Rules Out Iran Talks" type: "News" locale: "en" url: "https://longbridge.com/en/news/296295716.md" description: "South Korea's KOSPI plunged 5.5%, triggering a sell-side sidecar, as semiconductor giants SK Hynix and Samsung Electronics suffered sharp declines due to rising oil prices and escalating U.S.-Iran tensions. SK Hynix stock dropped 7.82% in Seoul and fell over 9% in U.S. trading. Meanwhile, Brent crude rose above $90, and President Trump ruled out talks with Iran, fueling market volatility across Asian and U.S. indices." datetime: "2026-08-19T01:58:26.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/296295716.md) - [en](https://longbridge.com/en/news/296295716.md) - [zh-HK](https://longbridge.com/zh-HK/news/296295716.md) --- # SK Hynix Stock Drops 7.82% in Seoul as KOSPI Suffers Brutal Rout: Brent Above $90, Trump Rules Out Iran Talks Asian stocks traded sharply lower at the time of writing, led by a more than 5% drop in South Korea’s **KOSPI**, while semiconductor heavyweights **SK Hynix Inc. – ADR** (NASDAQ:SKHY) and **Samsung Electronics** (OTC:SSNLF) also declined sharply. ## **Asian Markets Slide as Samsung, SK Hynix Tumble** South Korea’s KOSPI fell 5.50% to 6,492.22, extending losses across the benchmark as investors sold semiconductor stocks. Shares of SK Hynix in Seoul dropped 7.82% to 1.532 million Korean won, while Samsung Electronics declined 6.33% to 251,500 won. The sell-off also extended to U.S.-listed SK Hynix shares. The company’s American depositary receipt fell 9.20% to $155.62 in Tuesday’s U.S. session and was down another 1.38% at $153.47 in after-hours trading. Meanwhile, Japan’s Nikkei 225 fell 2.42% to 65,826.62. **Read Also: SK Hynix Stock Soars 22%, Samsung Jumps 19% as Kospi Hits Trading Halt: Dow Futures Climb 151 Points** ## **KOSPI Triggers Sell-Side Sidecar as Market Plunges 5%** The Korea Exchange activated a sell-side sidecar after the KOSPI 200 futures index fell sharply. Program trading in KOSPI-listed shares was suspended for five minutes at 9:06 a.m. local time, Yonhap News Agency reported. A sell-side sidecar is triggered when KOSPI 200 futures fall at least 5% for one minute, temporarily slowing program trading during extreme market moves. ## **US Stock Futures Edge Lower as Oil Prices Climb** **Dow futures** fell 22.00 points, or 0.04%, to 53,381.00, while **S&P 500 futures** declined 3.75 points, or 0.05%, to 7,710.25. **Nasdaq 100 futures** slipped 47.25 points, or 0.16%, to 29,538.75 as of around 9:01 p.m. EDT. In commodities, **WTI crude oil** rose 0.95% to $85.75 per barrel, while **Brent crude** gained 0.75% to $91.70 per barrel. **Natural gas futures** climbed 0.47% to $2.789 per MMBtu. Meanwhile, the U.S. dollar index, which tracks the greenback against a basket of currencies, stood at 99.661, up 0.02% on the day. ## **Trump Rules Out Iran Talks** On Tuesday, President **Donald Trump** said that there were no talks with Iran and none were scheduled. "There are no talks or conversations going on, or scheduled, with the Islamic Republic of Iran," Trump said in a **Truth Social** post. He also said the U.S. naval blockade remained in force and stated that the Strait of Hormuz was "open and operating." _Source: Truth Social_ ## **US-Iran Tensions Fuel Oil and Inflation Fears** The 60-day U.S.-Iran memorandum expired Monday without a broader peace agreement. An Iranian official reportedly warned that Tehran could shift to a "fully offensive" posture if diplomatic efforts fail. Back-channel diplomacy remains possible, with reports suggesting the Trump administration has reached out to figures linked to Iran’s Islamic Revolutionary Guard Corps despite stalled formal negotiations. **_Disclaimer_:** _This content was partially produced with the help of AI tools and was reviewed and published by Benzinga editors_. **Read Also: Iran Blames Netanyahu for Blocking, Derailing the US Ceasefire Deal, Says Israel's Efforts Are Ongoing: 'Biggest Opponent and Obstacle'** _Photo Courtesy: Poetra.RH on Shutterstock.com_ ### Related Stocks - [SKHY.US](https://longbridge.com/en/quote/SKHY.US.md) - [UCO.US](https://longbridge.com/en/quote/UCO.US.md) - [USO.US](https://longbridge.com/en/quote/USO.US.md) - [03175.HK](https://longbridge.com/en/quote/03175.HK.md) - [XES.US](https://longbridge.com/en/quote/XES.US.md) - [BNO.US](https://longbridge.com/en/quote/BNO.US.md) - [IXC.US](https://longbridge.com/en/quote/IXC.US.md) - [EWY.US](https://longbridge.com/en/quote/EWY.US.md) - [XLE.US](https://longbridge.com/en/quote/XLE.US.md) - [VDE.US](https://longbridge.com/en/quote/VDE.US.md) - [XOP.US](https://longbridge.com/en/quote/XOP.US.md) - [IEO.US](https://longbridge.com/en/quote/IEO.US.md) - [IEZ.US](https://longbridge.com/en/quote/IEZ.US.md) - [OIH.US](https://longbridge.com/en/quote/OIH.US.md) - [PXJ.US](https://longbridge.com/en/quote/PXJ.US.md) - [CRAK.US](https://longbridge.com/en/quote/CRAK.US.md) - [ERX.US](https://longbridge.com/en/quote/ERX.US.md) - [ERY.US](https://longbridge.com/en/quote/ERY.US.md) - [DUG.US](https://longbridge.com/en/quote/DUG.US.md) - [MLPA.US](https://longbridge.com/en/quote/MLPA.US.md) - [03097.HK](https://longbridge.com/en/quote/03097.HK.md) - [03121.HK](https://longbridge.com/en/quote/03121.HK.md) - [SSNGY.US](https://longbridge.com/en/quote/SSNGY.US.md) - [SSTK.US](https://longbridge.com/en/quote/SSTK.US.md) - [SMSN.UK](https://longbridge.com/en/quote/SMSN.UK.md) ## Related News & Research - [Oil eases as weaker demand outlook counters Mideast supply concerns](https://longbridge.com/en/news/295744721.md) - [EXCLUSIVE-Trump approval falls to 33%, lowest of his presidency, Reuters/Ipsos poll finds](https://longbridge.com/en/news/296137029.md) - [The Iran War Sent Gas Prices Skyrocketing, but the US Now Faces a Diesel Problem](https://longbridge.com/en/news/296343018.md) - [Oil edges up on uncertainty over exports through Hormuz](https://longbridge.com/en/news/296282399.md) - [4-Oil set for weekly gains after US threatens indefinite blockade of Iran](https://longbridge.com/en/news/295923118.md)