Market Brief — October 15, 2026

Asian trade was dominated by a 7.57% plunge in the KOSPI to 5,554.22 as investors unwound AI and chip exposure and an intraday drop of more than 8% triggered a 20-minute circuit breaker, while the Shanghai Composite (000001.SS) ended flat at 0.0%. European equities advanced, with France's CAC 40 (FRA40) up 0.8%, the FTSE 100 (UKX) up 1.1% and Germany's DAX (DAX) up 0.3%. In the US, the Dow Jones Industrial Average (DJIA) gained 1.1%, the S&P 500 (SPX) rose 0.3% and the Nasdaq Composite (^IXIC) added 0.1%, while sector ETFs such as XLV, XLB and XLY outperformed and XLE and XLU lagged.

In Korea, the KOSPI dropped 454.59 points, or 7.57%, to 5,554.22 after falling more than 8% intraday and triggering a 20-minute circuit breaker, as Samsung Electronics and SK hynix fell 9.48% and 11.06% and other AI-exposed suppliers declined between 6.26% and 9.28%. Across chip and AI themes, about $1 trillion in market value was erased this week while the $72 billion VanEck Semiconductor ETF SMH drew over $430 million of inflows and the triple-levered Direxion Daily Semiconductor Bull 3X ETF SOXL took in roughly $3.8 billion even as it fell nearly 21%. ECB policymaker Martins Kazaks said there is no immediate rush to raise rates and floated higher minimum reserve requirements to withdraw liquidity, while calendars showed markets waiting on UK August GDP with consensus at -0.1% month-on-month versus 0.4% previously, US September PPI forecast at 0.5% versus 0.4% previously and US retail sales consensus at 0.3% versus 1.2% previously.

Credit stress at CoreWeave intensified as five-year CDS widened to 1,194.5 basis points and yields on its 9.75% 2031 bond jumped to 15.78%, with some April-issued 2031 notes above 16%, after the company disclosed more than $51 billion of debt and its stock had plunged about 15.5% on Oct. 14 before rebounding the following day. Energy headlines were mixed as the IEA moved to complete the remaining 100 million barrels from its March emergency release, having already tapped roughly 330 million of the pledged 400 million barrels and planning a 20 million barrel diesel release 'as soon as possible', while Saudi Aramco offered additional one-off spot crude cargoes into Europe including at least four October-loading shipments to Poland's Orlen. In corporate and capital-raising news, AstraZeneca and insitro announced an AI-driven discovery collaboration focused on MASH and cardiomyopathies that could be worth up to about $1.86 billion, including $40 million upfront and up to roughly $1.46 billion in milestones, and Binance.US sought up to $100 million in new funding at an approximate $1 billion valuation to expand its U.S. crypto business. ECGI Holdings completed the acquisition of Avanta Group to build an AI-enabled healthcare platform, while Cronos closed its purchase of CanAdelaar and both Nasdaq and Nasdaq Private Market completed acquisitions of LeveL Markets and Nasdaq Fund Secondaries, and MiniMed's separation from Medtronic was finalized. On the announced side, EQT agreed to acquire Stockbridge as part of its real estate strategy, TKO Hotels called on Service Properties Trust to engage on a proposed $2.0 billion all-cash acquisition of a hospitality portfolio, and Vivos Therapeutics, Noor Companies and Sunbound outlined smaller strategic acquisitions and investments in healthcare testing, moving services and senior-living revenue management.