Updated from 8:03 a.m.

DuPont Photomask

(DPMI)

was down 11.7%, hitting a 52-week low of 32.27 in early trading, after the company posted fourth-quarter earnings of 1 cent per share, well below the estimate of 9 cents published by

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Thomson Financial/First Call

and the year-ago figure of 49 cents. Revenue was $92.8 billion, slightly less than $93.4 million in the same period last year.

The maker of manufacturing plates for semiconductors said it sees a first-quarter loss of 35 cents to 70 cents on revenue of $70 million to $80 million. The consensus estimate is for earnings of 15 cents.