Taiwan's stock market just suffered one of its worst weeks ever, and it's bad news for investors, tech companies, and anyone holding semiconductor stocks.

• The main index fell over 12% in a week, dropping below the key 40,000-point level, as cooling excitement around AI dragged down tech and chip stocks worldwide.
• Taiwan's total stock market value dropped by about NT$18 trillion in a single week, and the island slipped from 4th to 7th place globally in total stock market size, now behind the US, China, Japan, India, UK, and Canada.
• Chip-related stocks got hit hardest, with the electronics components sector down over 20%, while sell-offs in the US semiconductor industry spilled over into Asian markets.
• Taiwan's government stepped in, activating its national stabilization fund and tightening trading rules on volatile stocks, while also talking up confidence in the island's industry.
• The Taiwan dollar swung wildly, briefly weakening past a key level before snapping back thanks to central bank support and exporters selling foreign currency.

Outlook: With government support funds now active and officials publicly defending the market, some stabilization is likely in the short term, but the broader sell-off in AI and chip stocks could keep pressure on Taiwan's market if global tech sentiment stays weak.