Singapore · Thursday, September 17, 2026
asianomistAsia’s economy, daily.
Stocks & Bonds

Seoul Shares Drop, Ending Five-Day Win Streak on Profit-Taking

Seoul's benchmark KOSPI index closed lower on Tuesday, reversing a five-day rally. Investors booked profits in large-cap stocks amidst fading hopes for a US-Iran deal, impacting market sentiment.

By Marcus YeoPublished 21 August 20261 min read
Photo: joelmarrinan / Pixabay

KOSPI Reverses Five-Day Rally

Seoul shares finished lower on Tuesday, ending a five-day rally. The Korea Composite Stock Price Index (KOSPI) fell 108.11 points, or 1.55 percent, to 6,869.83. This decline followed a 2 percent higher open on the Seoul exchange. Investors secured profits in large-cap stocks after the recent gains. Market sentiment weakened due to reduced expectations for a US-Iran agreement. Elevated oil prices also fuelled inflation worries across the region.

Trading Activity and Investor Flows

Trading volume reached 399.04 million shares, valued at 29.64 trillion won (US$20.9 billion). Decliners significantly outnumbered gainers, with 679 stocks falling against 195 advancing. Institutions were net sellers, offloading 784.9 billion won worth of equities. Foreign investors bought a net 91.4 billion won. Retail investors added 731.29 billion won to their holdings, demonstrating continued interest in the market.

Large-Cap Performance and Won Strength

Large-cap stocks showed mixed results. Samsung Electronics, a market bellwether, decreased 2.19 percent to 268,500 won. Top carmaker Hyundai Motor declined 3.97 percent to 435,000 won. Hanwha Aerospace dropped 1.21 percent, and POSCO Holdings shed 2.84 percent. Conversely, chipmaking rival SK Hynix rose 1.03 percent to 1.66 million won. Samyang Foods also climbed 5.04 percent. The Korean won strengthened, trading at 1,411.8 won against the US dollar, up 1.2 won from the prior session.

Why it matters

The KOSPI's reversal shows investor caution, particularly regarding geopolitical risks and their impact on commodity prices. Continued high oil prices present an inflation challenge for South Korea's import-dependent economy. This could influence the Bank of Korea's future monetary policy decisions.

Asian investors will watch for any renewed US-Iran talks, as a deal could soften oil prices and ease regional inflationary pressures, affecting trade balances.

This article is journalism, not investment advice; consult a licensed professional before making financial decisions. Market data is indicative, may be delayed, and should be verified with your broker or exchange before use.

Comments.

Comments are moderated. We remove what is unlawful, abusive or off-topic, and and you remain responsible for what you post.

Reader comments open soon. Until then, corrections and responses go to our newsroom, and we publish what we get wrong on Corrections.