On July 28, Amkor Technology declined 6.24% overnight, trading at $56.92 per share, with Turnover of $7,009.28.

The decline was triggered by the company's Q3 revenue guidance falling short of Wall Street expectations, despite reporting a significant Q2 earnings beat. Amkor posted Q2 EPS of $0.70, surpassing the consensus estimate of $0.48 by 46% and representing a 218% year-over-year increase. Q2 revenue came in at $1.898 billion versus the $1.808 billion estimate. However, the company guided Q3 revenue to $1.95 billion-$2.05 billion, below the analyst consensus of $2.10 billion, becoming the primary catalyst for selling pressure.

The sell-off was amplified by profit-taking dynamics, as the stock had previously surged over 12% following a $1.5 billion multi-year advanced packaging partnership with Nvidia announced on July 24. Additionally, the stock had already declined approximately 5-6% during the regular session amid broad semiconductor sector weakness, creating a classic pattern of gains being unwound on news confirmation.

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