Korea's AI week from hell: Kospi -14.46%, worst since Lehman

<p><em>Special Reporting from LSN News, adapted from today's Asia Money Map episode. <a href="https://youtu.be/88CKLe8Axyc" target="_blank" rel="noopener">Watch the video on YouTube.</a></em></p>

<p>South Korea's Kospi fell 14.46% in the week ending Friday, 16 October, its steepest weekly drop since October 2008, when Lehman Brothers collapsed. Even the March 2020 Covid crash never produced a weekly loss this large. Thursday was the panic day, but the week is the real story.</p>

<h2>A Lehman-scale week in Seoul</h2>

<p>From the 8 October close of 6,625.93, the Kospi finished Friday at 5,668.05, down 957.88 points, or 14.46%, according to Benzinga and Korea Exchange closes. The index fell 3.65% on Monday and 5.46% on Tuesday, paused on Wednesday, then dropped 7.57% on Thursday, a session that tripped a circuit breaker. Friday's 2.05% rise snapped a seven-session losing streak. One green day does not erase a Lehman-scale week.</p>

<p>The chip names tell the same story. SK hynix ended the week down about 24.3% and Samsung Electronics about 17.8%. Benzinga reports both logged their worst week since October 2008. On Thursday alone, Samsung sank 9.48% and SK hynix 11.06%. When those two fall, Seoul's whole index falls with them.</p>

<p>Elsewhere in the region, Japan's Nikkei lost about 4.9% on Thursday, then recovered 1.4% on Friday to about 65,324, AFP reports. Taiwan's Taiex fell more than 3% on Thursday and edged higher on Friday, while Hong Kong and Shanghai closed modestly up. Indonesia was the outlier, with Jakarta plunging on MSCI's Standalone consultation. The rest of North Asia was living inside the AI unwind.</p>

<h2>Three shocks at once</h2>

<p>Three shocks landed together. The first was doubt about AI cash flows and debt. Bond stress at CoreWeave, reports of slowing growth at Anthropic and a CNBC estimate that 20 top AI and chip stocks lost more than $1 trillion in market value over the week rattled the trade. The second was hotter US inflation: September consumer prices rose 3.7% year on year, above expectations, reviving bets that the Federal Reserve may tighten again. The third was headlines about Chinese memory competition, which fed share and price fears for Samsung and SK hynix.</p>

<p>Foreign money drove the selling. Through Thursday, foreign investors were net sellers in Seoul for eight straight sessions, with Thursday's outflow about 3.6 trillion won. On Friday they flipped to net buyers for the first time in nine sessions, buying roughly 340 billion to 350 billion won, according to local tallies. That is relief buying, not a full rebuild of the AI premium.</p>

<p>In Bangkok, Federal Reserve chair Kevin Warsh told the IMF meetings that AI is the most consequential change to the global economy in his lifetime, with huge benefits over the horizon, but a path that will be "very bumpy". Friday's bounce also followed Nvidia chief Jensen Huang's defence of CoreWeave.</p>

<h2>The other Asia money map</h2>

<p>Malaysia's statistics office said third-quarter GDP rose 5.3% year on year, above a Bloomberg consensus of 5.1%, after 6% in the second quarter. Manufacturing accelerated to 7.5%, led by electrical and electronics. Construction grew 6%, including data-centre projects, while mining contracted 4.9%. For the first nine months, Malaysia's economy is up 5.5%. Singapore's flash third-quarter estimate also beat expectations, at about 5.4%. Factories can still grow when valuations crack.</p>

<p>Next up are Monday's China GDP print, Thursday's Bank of Korea rate decision and the Federal Reserve meeting later this month.</p>

<h2>Our verdict</h2>

<p>Korea just posted its worst equity week since the global financial crisis because AI debt fears, hot US inflation and China memory headlines hit Asia's most concentrated chip market at the same time. Friday's 2% bounce buys time. It does not prove the AI premium is safe. Malaysia and Singapore's GDP prints show factories can still grow even when valuations crack. The open question is whether Beijing's growth number steadies Asia, or whether Seoul's Lehman-scale week becomes the template.</p>

<h2>Sources</h2>

<ul>

<li><a href="https://www.benzinga.com/markets/equities/26/10/62414195/kospi-worst-week-since-2008-sk-hynix-samsung-ai-selloff" target="_blank" rel="noopener">Benzinga, 16 Oct 2026</a></li>

<li><a href="https://tenbrief.com/en/2026/10/17/kospi-weekly-october-12-16-2026/" target="_blank" rel="noopener">TenBrief, 17 Oct 2026</a></li>

<li><a href="https://www.afp.com/en/asian-stocks-rise-tech-bounces-rout-warsh-upbeat-ai" target="_blank" rel="noopener">AFP, 16 Oct 2026</a></li>

<li><a href="https://www.business-standard.com/markets/news/asian-stocks-rebound-after-tech-sell-off-indonesia-market-plunges-11-126101600100_1.html" target="_blank" rel="noopener">Business Standard / Reuters, 16 Oct 2026</a></li>

<li><a href="https://www.channelnewsasia.com/business/stocks-slip-dollar-heads-weekly-loss-6464776" target="_blank" rel="noopener">CNA / Reuters, 16 Oct 2026</a></li>

<li><a href="https://www.dosm.gov.my/portal-main/release-content/advance-gross-domestic-product-gdp-estimates-q32026" target="_blank" rel="noopener">Department of Statistics Malaysia, 16 Oct 2026</a></li>

<li><a href="https://theedgemalaysia.com/node/822083" target="_blank" rel="noopener">The Edge Malaysia, 16 Oct 2026</a></li>

</ul>