周四的跌势由晶片设备制造商领跌。Teradyne、Entegris及KLA等公司跌幅均超过10%，而Lam Research和Applied Materials各下跌约8%。据报导，人工智慧新创公司Anthropic已与三星电子就客制化AI晶片的制造合作进行洽谈。
尽管近期波动剧烈，过去两周该指数几乎每个交易日收盘涨跌幅都超过2%，但费城半导体指数2026年以来仍累计上涨78%，有望创下自1999年以来的最佳年度表现。投资者正在评估人工智慧设备支出的可持续性。
Semiconductor stocks opened the third quarter with their worst two-day selloff in nearly a month. The Philadelphia Stock Exchange Semiconductor Index, which had surged 88% in the second quarter for its best quarter ever, fell as much as 6% on Thursday, putting it on pace for a 12% decline over two sessions — the steepest since June 5.
Thursday's decline was led by chip equipment makers, with Teradyne, Entegris, and KLA each falling more than 10%, while Lam Research and Applied Materials dropped roughly 8%. Meanwhile, AI startup Anthropic reportedly held talks with Samsung Electronics as a potential manufacturing partner for a custom AI chip.
Despite the recent volatility — with the index closing up or down more than 2% on all but one session over the past two weeks — the benchmark remains up 78% in 2026, on track for its best year since 1999. Investors continue to weigh the sustainability of the AI-driven spending boom that has fueled soaring earnings in the sector.