Alpha & Omega Semiconductor (AOSL) reported a fiscal Q4 non-GAAP diluted loss late Wednesday of $0.13 per share, swinging from profit of $0.02 a year earlier.
Four analysts polled by FactSet expected a loss of $0.24.
Revenue in the three months ended June 30 fell to $170.4 million from $176.5 million a year earlier.
Four analysts projected $168 million.
The company expects fiscal Q1 revenue of $176 million, plus or minus $10 million.
Four analysts project $180.5 million.
Alpha & Omega shares fell 13% in after-hours trading.