Updated from 11:09 a.m.

Shares of Select Comfort ( SCSS) were among the Nasdaq's losers Friday, falling 21.7% after the company warned that fourth-quarter sales would fall below previous guidance.

The mattress maker now expects sales of $143 million to $149 million. Previously, it expected sales of $153 million to $158 million. Analysts polled by Thomson First Call had been expecting sales of $155.5 million. "Sales during the early part of the holiday season, particularly over the Thanksgiving weekend, were slower than anticipated," the company said.

The sales warning marks the second straight quarter in which Select Comfort delivered bad news. During the third quarter, Select warned investors that its earnings would fall below expectations. Shares traded down $4.30 to $15.52.

Fifth Third Bancorp ( FITB) fell 7.1% after the company warned that its fourth-quarter results would fall below expectations. The banking company said it expects earnings of 28 cents to 30 cents a share. Analysts had been expecting earnings of 82 cents a share. The company blamed the shortfall on rising interest rates that hurt the company's securities portfolio. Shares traded down $3.67 to $47.99.

Shares of Barbeques Galore ( BBQZ) fell 24.8% after the company posted a third-quarter loss and warned that fourth-quarter performance could be hurt by softness in the consumer durables market. Excluding one-time gains, the retailer posted a loss of 12 cents a share on sales of $50.5 million. Looking ahead, the company said "the fourth quarter in Australia is seasonally the company's strongest. The market for consumer durables, however, appears to have softened in both the U.S. and Australia, and is currently impacting our sales somewhat in both countries." Shares traded down $1.86 to $5.65.

Mandalay Resort Group ( MBG) rose modestly Friday after the company posted strong third-quarter results. Excluding items, the hotel and casino operator earned $1.04 a share on sales of $720.3 million. Analysts were expecting earnings of 88 cents a share on sales of $691.4 million. A year ago, Mandalay earned 63 cents a share on sales of $625.6 million. The company said that hotel and gaming sales at its Las Vegas Strip resorts were particularly strong during the quarter. Shares traded up 50 cents to $70.19.

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