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MARKET BRIEFING · KOREA

US chip stocks bounced overnight, yet the KOSPI fell alone with all 21 industries in the red.

October 20, 2026 · Read the Korean original

Major indices

  • KOSPI 5,552.74 -3.73%
  • KOSDAQ 781.97 -3.33%

The rebound lasted only two sessions. The KOSPI closed 3.73% lower at 5,552.74 and the KOSDAQ fell 3.33% to 781.97, giving back two days of gains in one. This was not just an index drop but a market-wide one: only 135 KOSPI stocks rose against 752 decliners, and the KOSDAQ saw 431 advancers against 1,261 decliners. Across both markets only 4 stocks set 252-session highs while 11 set new lows.

All 21 industries we track fell without exception, and the heavy-industry and infrastructure names that led the market this year fell hardest. In defense, Hyundai-Rotem posted third-quarter results below expectations, and Business Post reported that doubts over a planned US defense budget increase had dragged US defense shares lower overnight. Among cable and power-equipment names, concerns about the debt burden and profitability of AI data-center investment spread, and LS Eco Energy dropped 14.59% even after reporting strong third-quarter results (News1). Korea Circuit, the only gainer among 43 semiconductor names, rose 12.40% as package-substrate price increases and expected demand for AI server substrates came together. Industry and stock moves are set out in the industry watchlist below.

Money leaving equities left traces in the won and in bonds. The won strengthened as the dollar-won rate fell 10.3 won from the previous day to 1,332.1, while the three-year government bond yield slipped 3.7 basis points to 3.84% and the ten-year fell 2.9 basis points to 4.176%. As of October 15, investor deposits stood at 96.9 trillion won, down 515.9 billion won from the previous reading, and credit-financing balances fell 955.8 billion won, or 2.84%, to 32.7 trillion won, meaning borrowed money is leaving first. KOSPI non-arbitrage program trading showed net selling of 261.7 billion won, and Korea's weight in the MSCI Emerging Markets index was 18.44% as of October 16, down 2.29 percentage points in a week.

The character of the day shows in the fact that Korean stocks alone sank even after chip shares in New York snapped a losing streak overnight. Polinews and Sisa Journal reported that renewed concern over the profitability of AI investment coincided with simultaneous net selling by foreign and institutional investors, compounded by fiscal unease in Europe. Money has not left the market entirely: on relative strength semiconductors remain the leading industry, with chip testing strongest within it, yet the only funds that held a positive daily return were REIT and dividend products such as PLUS K REIT (0.42%). Even Systems Technology, the top name on relative strength, fell 9.00%, so leadership offered no shelter from this decline.

The index levels, advance-decline counts, industry and stock moves, and the currency, rate and market-funding figures are confirmed values from exchange data and this site's own collection. The reasons behind the slide in defense and cable shares, and how much AI profitability concern and European fiscal unease weighed on the index, are readings from the press and brokerages and should be treated as estimates. How far the selling by foreign and institutional investors runs is unclear. Because of reporting lags, investor deposits and credit financing are as of October 15 and the MSCI weights as of October 16.

Watchlist stocks by industry

Defense -7.96% · 0 of 13 up

Power infrastructure -7.56% · 0 of 12 up

Shipbuilding -5.94% · 0 of 15 up

EV batteries -5.79% · 1 of 13 up

Chemicals & refining -5.24% · 1 of 21 up

Semiconductors -4.36% · 1 of 43 up

Sources (Korean-language)

This market briefing was compiled by AI from this site's own price and filing data together with public news reports, and translated from the Korean original. Please check the sources below before relying on it.

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