Taiwan's IC substrate leader Unimicron crashed to its daily price limit at the open after reports it faked the country of origin on some products — bad news for holders, especially the many funds that own it heavily.

• Unimicron shares and its stock futures both opened limit-down, with a huge pile of unfilled sell orders and almost no buyers.
• The suspected problem is mislabeled origin on circuit boards, not on the ABF substrates that drive most of the company's business.
• Local analysts expect the fallout to be fines, back taxes, and criminal charges for the people involved, rather than a US blacklisting, since no national security angle is in play.
• US customers have little room to switch suppliers anyway — ABF substrates are in short supply and no rival plant can absorb the orders.
• The bigger short-term risk is forced selling, because Unimicron is a top holding in active ETFs and funds.

Outlook: The damage looks contained to the legal bill and a sharp near-term hit to the share price, with orders likely to stay put.