Unimicron Raided, Short Selling Soars 84% in One Day: Who Was Selling Before the News Broke?

Unimicron, the top player among Taiwan's 'Big Three Substrate Makers,' opened sharply lower on August 31, immediately hitting the daily lower limit of NT$999. The stock remained locked at this price throughout the session, closing down NT$111, or 10%, marking its first close below the NT$1,000 threshold and officially exiting the elite 'thousand-dollar stock' club. At one point, sell orders exceeded 90,000 lots, but with insufficient buyers, trading volume shrank despite the massive sell-side pressure.

This marks the second consecutive day of sharp declines for Unimicron. On August 28, the stock closed at NT$1,110, down 5.93%. Combined with the 31st's limit-down, the two-day cumulative drop reached 15.34%. From the intraday peak of NT$1,230 on the 28th, the share price has plunged 18.8% in just two days. Market panic over the prosecutor's raid and controversy surrounding origin labeling appears not yet fully priced in.