Silicon Valley Bankshares, the Santa Clara, Calif., company whose lending is closely tied to the technology sector, saw its shares fall 10.9% Friday after it had issued a profit warning for the year.

Late Thursday, John H. Dean, the bank’s president and chief executive, cut his earnings estimate for the year to a range of $2.60 to $2.80 per share, from $3, and well below the First Call/Thomson Financial consensus of $2.84. The share price fell to $23 Friday, down $2.8125. Though Mr. Dean said that the company expects earnings of 65 cents to 68 cents per share this quarter (68 cents would match the consensus), some on Wall Street expressed concern, and one analyst downgraded the stock.

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