Taiwan's panel maker AU Optronics swung from a huge one-day jump to a sharp fall, a warning for anyone chasing the stock on unconfirmed deal talk.

• AU Optronics hit its daily limit-up on rumors Intel wants to work with it on Micro LED packaging and that TSMC may take over its central Taiwan plant.
• Foreign investors piled in with the biggest single-day buying in the whole market, only for the stock to drop over 6% the next day on heavy volume.
• Neither company has confirmed anything, and the advanced packaging technology is still in testing — real revenue is years away.
• Taiwan's broader market stayed strong, with TSMC, MediaTek and Foxconn all climbing and the index pushing back above 48,000.
• Elsewhere: Binance put $100 million into USDC issuer Circle, and Taiwan Cement agreed to buy Ukraine's second-largest cement maker.

Outlook: Expect more wild swings in AU Optronics until the Intel and TSMC rumors are either confirmed or die out, with foreign money flows the thing to watch.