Ambarella Inc. shares fell in the extended session Thursday after the video chip maker forecast revenue for the current quarter well below Wall Street estimates. Ambarella shares declined 1.5% to $57 on heavy volume. The company said it expects fourth-quarter revenue of $65 million to $67.5 million. Analysts surveyed by FactSet had forecast $76.3 million. Ambarella reported adjusted third-quarter earnings of $1.08 a share on revenue of $93.2 million. Analysts had expected 86 cents a share on revenue of $89.9 million.
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