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• Silver Spring Networks, a technology company based in Redwood City, Calif., surged $4.01, or 24 percent, to $21.01 on its stock market debut.

• Express fell $1.49 to $17.36 after the clothes retailer’s earnings report disappointed investors. Michael Weiss, the company’s CEO and chairman, told analysts on a conference call that consumer numbers were “down noticeably” compared to last year.