The company’s fourth-quarter guidance – revenue of $62m-$70m and a gross margin of 23-26% – spooked investors. In the fourth quarter of 2014 the Petaluma, California-based company notched revenue of $105.2m and a gross margin of 33.3%.

Enphase shares fell 40% in early trading Wednesday, to about $2.25, a more than three-year low. The shares were worth $14.21 at the beginning of 2015.

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