Cirrus Logic Inc.'s (CRUS) fiscal first-quarter earnings fell 48% as costs from an earlier production problem cut into the semiconductor maker's margins.

Shares dropped 8.2% to $16.44 premarket Thursday. The stock was still up 12% this year through the close.

The supplier of chips used in Apple Inc. (AAPL) devices such as the iPod and iPad in April disclosed manufacturing problems with a new audio device that had just entered high-volume production. Cirrus said it expects to resolve the issue by the end of the current quarter.

Still, Standard & Poor's Ratings Services in May upgraded the chip maker, crediting its steady operating performance and bright overall prospects.

For the quarter ended June 25, Cirrus Logic reported a profit of $9.2 million, or 13 cents a share, down from $17.6 million, or 25 cents a share, a year earlier. Excluding stock-based compensation, tax provisions and other items, per-share earnings were 24 cents, down from 29 cents. Analysts had most recently forecast 24 cents.

Revenue rose 13% to $92.2 million. The company in April projected $88 million to $94 million, a downbeat view at the time.

Gross margin narrowed to 51.7% from 57.1% as input cost jumped 27%.

Sales in the company's audio segment--its main top-line contributor--rose 32%, while revenue fell 24% in the smaller energy unit.

The company expects revenue between $101 million and $105 million in its second quarter, in line with analysts' $103 million estimate, according to a poll by Thomson Reuters. The company also forecast gross margin of 52% to 54% for the current quarter.

 
   -By Drew FitzGerald, Dow Jones Newswires; 212-416-2909; Andrew.FitzGerald@dowjones.com 
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