Alchip's stock crashed to its daily loss limit even after the chip designer posted its best month ever, a bad sign for investors betting on the AI supply chain.

• Alchip's August revenue hit a record, up sharply from a year earlier on heavy shipments of Amazon's new AI accelerator chips.
• The stock still fell to limit down, breaking below its quarterly average price and hitting its lowest level since mid-August.
• Traders sold the good news: several Taiwanese stocks have been dumped the day after reporting record sales.
• The bigger worry is Qualcomm, which just teamed up with Amazon on AI chips and could take future orders away.
• Foreign analysts say the threat is limited because Qualcomm's work covers only part of what Alchip's Amazon chip does.

Outlook: Alchip's stock is likely to stay shaky until investors get clarity on whether Amazon splits its chip orders.