During early trading today, the stock slid more than five percent to as low as 30-3/8, down from yesterday's close of 32-1/4.
Yahoo, however, is on target to meet or beat Noglows's first-quarter earnings forecast of 0 cents a share on revenues of $8.6 million.
Noglows said traffic at the company's Web site continues to build at all sites, with its Japanese service now logging over 2 million pages per day.
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During early trading, the company's stock was up as high as 11-7/8, an increase of more than ten percent from yesterday's close of 10.
Roberton Stephens analyst Keith Benjamin increased his 1998 fiscal year earnings estimate to 6 cents a share profit, from a loss of 15 cents a share.
"Business momentum appears strong with positive impact from management transition. We can expect significant revenue upside from both subscriptions and advertising based on more focused marketing," said Benjamin in a statement.
Reuters contributed to this report.