The Magnificent Seven tech stocks experienced a $890 billion decline in market value on Thursday amid concerns about artificial-intelligence spending returns.

七巨头由主要科技和人工智能相关公司组成，其估值与围绕AI投资效率和回报的预期紧密相关。市值大幅下跌反映出对当前AI支出水平是否能证明预期回报合理的重新评估，这影响了投资者对科技板块及追踪这些股票的更广泛股指的信心。