Taiwan's stock market opened higher Wednesday on a rebound in US tech stocks, but the bigger story is a major banking security breach that hit hundreds of customers.

• Taiwan's main index jumped about 0.8% in early trading, with chipmakers TSMC and MediaTek leading gains after US semiconductor and AI stocks rallied ahead of the US midterm elections.
• US markets were mixed: the S&P 500 and Nasdaq rose while the Dow fell on Apple earnings worries, and AI chip makers AMD and Super Micro both posted strong revenue growth.
• Investors are watching the US midterm elections closely, since control of Congress could shape future policy on defense, AI, and healthcare, with Wall Street warning a Democratic sweep could pressure AI stocks.
• Taiwan's SinoPac Bank suffered a major security failure where over 400 customer accounts were drained of a combined 40+ million Taiwan dollars, with money funneled into a single account at another bank; the bank says it has frozen the receiving account and refunded all affected customers.
• Delta Electronics shares kept sliding, now down roughly half from their May peak, while memory chip stocks were mostly higher and silicon wafer maker GlobalWafers fell after a mixed earnings call.

Outlook: Markets should stay volatile until the US election results are clear, while Taiwan regulators continue monitoring both global market swings and the fallout from the banking breach.