标普500指数转为负值纳斯达克100指数跌0.5%。

Core Insights - The S&P 500 index has turned negative, indicating a shift in market sentiment [1] - The Nasdaq 100 index has decreased by 0.5%, reflecting a decline in technology stocks [1] Market Performance - The S&P 500 index has shown a negative performance, suggesting potential concerns among investors [1] - The Nasdaq 100 index's drop of 0.5% highlights a downturn in the tech sector, which is often seen as a bellwether for market trends [1]