Amkor Technology Inc. shares fell in the extended session Monday after the microchip packaging and services company's quarterly revenue and outlook fell below Wall Street estimates. Amkor shares dropped 10% to $9.40 a share after hours. The company forecast revenue of $860 million to $940 million for the first quarter. Analysts surveyed by FactSet expect $964.6 million. For the fourth quarter, Amkor reported earnings of 42 cents a share on revenue of $1.02 billion. Analysts had estimated earnings of 28 cents a share on revenue of $1.04 billion.
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