Taiwan's stock market suffered its worst crash in years, which is bad for chipmakers and AI-related stocks but good news for people holding telecom, biotech, and defensive stocks.

• Taiwan's main index crashed almost 4,000 points at one point, the biggest intraday drop in history, before closing down about 1,873 points and falling below the key 40,000 level.
• The sell-off followed a rout in US chip stocks and a market-wide panic in South Korea and Japan, dragging down Taiwan's chip giants like TSMC, which briefly hit its daily price-drop limit.
• Memory chip makers (Nanya, Winbond, Macronix) got hit hardest, with several stocks locked at their maximum daily loss, while chipmaker MediaTek and lens maker Largan fell only slightly.
• Money flowed into safer corners of the market instead: telecom stocks like Chunghwa Telecom hit record highs, and biotech, cybersecurity, and bicycle makers also gained.
• South Korea's government stepped in to calm its own market meltdown, suspending a margin-trading rule for three months and promising more support if the selling continues.

Outlook: Markets remain jittery and tied to US chip-stock swings; expect more volatility until AI-sector sentiment stabilizes, with safer sectors like telecom and biotech likely to keep attracting money in the meantime.