KLA shares fall about 10% premarket after cautious September-quarter outlook

KLA shares fell roughly 10% in premarket trading on July 29, 2026, a day after a fiscal fourth-quarter beat. The article attributes the drop mainly to the forward guidance, which investors read as cautious. It also cites expected lower wafer-fab equipment spending and export-control risk as secondary worries, and notes the stock had already fallen about 6% in the prior regular session.

• Premarket move about -10.4% on July 29, 2026
• Prior regular session move about -6.2%
• Main cause: September-quarter guidance, not the reported beat
• 52-week high cited at $307.37