On July 29, KLA-Tencor fell 11.3% in pre-market trading, trading at approximately $171.70/share, with turnover of $2.52 million. The decline followed the company's after-hours earnings release the prior session, which triggered broad profit-taking despite a strong beat.

KLA reported fiscal Q4 revenue of $3.66 billion, a record high that exceeded the consensus estimate of $3.598 billion, representing 15.1% year-over-year growth. Adjusted EPS came in at $1.05, surpassing the $1.00 estimate by 5%. Non-GAAP gross margin reached 62.4% at the upper end of guidance, while operating margin was 43.7%. However, first fiscal quarter guidance only slightly exceeded market expectations, disappointing investors looking for more upside.

With KLA shares having accumulated gains exceeding 57% year-to-date, investors chose to lock in profits on the earnings release. Additional headwinds included reports of China mass-producing domestic DUV lithography machines, which pressured overseas semiconductor equipment names broadly. UBS had previously lowered its price target on KLA from $255 to $240 while maintaining a Neutral rating, reflecting institutional caution on elevated valuations.

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