Taiwan's IC substrate leader Unimicron crashed to its daily limit-down on origin-labeling allegations, wiping out a huge chunk of its value — bad for panicked sellers, but big institutions treated it as a buying chance.

• Unimicron locked at limit-down with almost no trading, losing roughly NT$182 billion in market value in one day.
• The selling came from a "fake origin" investigation, with sell orders piling up more than 90,000 lots deep.
• Foreign investors and local funds sold nothing and instead bought the dip, with foreigners picking up over 2,200 lots.
• Big institutions say the probe touches ordinary circuit boards, not the high-end ABF substrates that drive profits, so the damage looks emotional rather than financial.
• The pain spreads wider than one stock: Unimicron is Taiwan's 10th-largest listed company and a core holding in major Taiwan ETFs.

Outlook: A US brokerage sees the drop as a buying opportunity below NT$950, suggesting the stock may stabilize once the origin-labeling scare fades.