# KOSPI Plunges 1.6% as AI Fears Hit Tech Giants

> KOSPI drops 1.6% to 5,575 after AI profitability concerns slash semiconductor stocks.
- Title: KOSPI Plunges 1.6% as AI Fears Hit Tech Giants · BigGo Finance
- Summary: KOSPI drops 1.6% to 5,575 after AI profitability concerns slash semiconductor stocks. KOSPI fell 1.6% to 5,575 as AI profitability fears triggered sharp…
- Keywords: kospi, samsung electronics, sk hynix, philadelphia semiconductor index, ai profitability, semiconductor stocks, kosp, kodq, finance, markets, Plunges, Fears
- Source: BigGo Finance — https://finance.biggo.com/news/82471c36-5eaf-4c35-820f-4a3ac066a70f
- Author: BigGo Finance
- Published: 2026-10-19T00:35:19+00:00
- Read time: 1 min
- Topics: kospi, samsung electronics, sk hynix, philadelphia semiconductor index, ai profitability, semiconductor stocks, kosp, kodq, finance, markets
## KOSPI Plunges 1.6%
KOSPI fell into the high-1% range and slid to the 5,570 level in early trading on the 19th.
## AI Profitability Fears
Concerns over U.S. AI infrastructure investment profitability weighed down semiconductor stocks.
## Semiconductor Selloff
Philadelphia Semiconductor Index dropped 3.83% and SK Hynix ADR plunged 6.58%.
## Stock Market Reaction
Samsung Electronics fell 0.70% and SK Hynix dropped 2.36% in early trading.
## Investor Split
Foreign investors bought net 563.3 billion won while retail investors sold net 845.6 billion won.
## Technical Rebound
Analysts say KOSPI may rebound after steep decline but support at 5,300 level is critical.

> This week, south korea's stock market will likely see high volatility as anxiety over the ai industry resurfaces following friday's plunge in u s ai stocks
## AI Revenue Concerns
Anthropic revenue growth slowed sharply while CoreWeave corporate bonds lost value.
## Key takeaway

KOSPI fell 1.6% to 5,575 as AI profitability fears triggered sharp declines in Samsung Electronics and SK Hynix shares.