Taipei: The Taiwan Stock Exchange's main index opened down 104.89 points at 30,330.58 on Thursday with a turnover of NT$12 billion (US$382 million).According to Focus Taiwan, this decrease in the index comes amidst various market conditions impacting investor sentiment. The turnover reflects the trading volume and the monetary value of transactions within the market, indicating a cautious approach by investors. Further analysis might be required to understand the underlying factors contributing to this drop at the opening.