On July 28, Amkor Technology fell 9.7% in pre-market trading, trading at $55.24/share, with turnover of $704,400. The decline was triggered by the company's Q3 revenue guidance falling short of Wall Street expectations, despite delivering a significant Q2 earnings beat.

Amkor reported Q2 EPS of $0.70, beating the consensus estimate of $0.48 by approximately 46% and representing a 218% year-over-year increase from $0.22. Revenue came in at $1.898 billion, surpassing the $1.808 billion estimate, while gross margin expanded to 16.8% from 12.0% a year earlier. However, the company guided Q3 revenue to $1.95 billion to $2.05 billion, with a midpoint of $2.0 billion, below the analyst consensus of approximately $2.1 billion, becoming the primary trigger for selling.

Additionally, the stock had previously surged over 12% after announcing a $1.5 billion multi-year advanced packaging partnership with Nvidia, accumulating significant short-term gains that added profit-taking pressure. The semiconductor equipment sector also traded broadly lower, with ASML down 3.52%, Applied Materials down 4.33%, Lam Research down 3.88%, and KLA down 3.66%.

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