On September 14, Entegris fell 7.46% in regular trading, trading at $130.12/share, with turnover of $31.26 million. The stock had already dropped nearly 6% in pre-market trading before extending losses during the regular session.

On the news front, escalating US-China trade friction coupled with tightened semiconductor export controls exerted systemic pressure across the semiconductor equipment sector. The broader industry saw steep declines, with Teradyne down 10.39%, Lam Research down 6.78%, Applied Materials down 6.61%, ASML down 5.89%, and KLA Corporation down 4.92%. As a global supplier of microcontamination control products, specialty chemicals, and advanced materials handling solutions critical to semiconductor manufacturing purity, Entegris is directly exposed to shifts in trade policy that may restrict cross-border equipment and materials flows. The sell-off reflects heightened uncertainty over the regulatory environment rather than any company-specific fundamental deterioration, with Entegris reporting EPS of $0.93 in its most recent quarter.

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