Shares of Hornbeck Offshore Services ( HOS) were among the NYSE's losers Thursday, tumbling 20% after the oil service company cut its fourth-quarter earnings estimate.

The company now projects earnings of 61 cents to 63 cents a share, down from an earlier forecast of 72 cents to 77 cents a share. The guidance includes a one-time gain of $1 million, or 4 cents a share. Analysts polled by Thomson First Call anticipated earnings of 75 cents a share.

"On our last earnings call, we reported that market conditions for offshore supply vessels operating in the U.S. Gulf of Mexico were getting choppy," Hornbeck said. "However, during the latter half of the fourth quarter we experienced even more volatility than we expected." Shares were trading down $6.70 to $26.81.

Six Flags ( SIX) climbed 10% after the amusement park operator agreed to sell seven of its amusement parks for $312 million. Six Flags will receive $275 million in cash and a note receivable for $37 million for three water parks and four theme parks. The sale of the parks will help Six Flags reduce debt and improve operational and financial flexibility, the company said. Shares were up 53 cents to $5.96.

Shares of Lear ( LEA) jumped 10% after the auto parts seller forecast higher sales and profits in 2007. In a Securities and Exchange Commission filing, Lear forecast 2007 sales of about $15 billion, up from $14.5 billion in 2006 despite production cuts from U.S. automakers. The company sees operating earnings from its core businesses rising to $560 million to $600 million from $520 million to $550 million last year. Lear shares recently were adding $2.93 to $30.72.

Shares of Stride Rite ( SRR) rose 7% after the footwear company posted better-than-expected fourth-quarter results. For the period ended Dec. 1, the company reported adjusted earnings of $1.5 million, or 4 cents a share, on revenue of $151.8 million. Analysts expected earnings of 2 cents a share and revenue of $148.7 million. A year earlier, the company reported adjusted earnings of $455,000, or a penny a share, on revenue of $131.7 million.

Looking ahead, Stride Rite forecast 2007 earnings of $1.10 to $1.15 a share. The company predicts revenue growth of 5% to 8%, implying revenue of $617.6 million to $635.3 million. Shares were trading up $1.08 to $16.31.

CACI International ( CAI) fell 1% after the defense contractor said its chief financial officer left the company. CACI did not offer an explanation for Stephen Waechter's departure, but said he will be replaced immediately by Thomas Mutryn, who will serve as acting CFO and treasurer. Wachovia downgraded the stock to market perform from outperform on the news. Shares were trading down 68 cents to $56.53.

Shares of Restoration Hardware ( RSTO) fell 8% after the home furnishings retailer said fourth-quarter earnings would be at the low end of its previous guidance. The company's prior guidance called for earnings of 34 cents to 44 cents a share, including 2 cents a share in stock options expense and up to 6 cents a share for costs associated with the company's bonus program. Analysts project earnings of 41 cents a share. The company said results were hurt by margin pressure amid a promotional holiday season for home furnishings retailers. Shares were trading down 61 cents to $7.36.

NYSE volume leaders included Pfizer ( PFE), up 14 cents to $26.34; Sprint Nextel ( S), down 25 cents to $17.60; Ford ( F), up 2 cents to $7.75; ConocoPhillips ( COP), down 63 cents to $63.90; Nokia ( NOK), up 41 cents to $19.49; Motorola ( MOT), up 29 cents to $18.45; Advanced Micro Devices ( AMD), up 36 cents to $20.37; and Texas Instruments ( TXN), down 18 cents to $29.15.

Nasdaq volume leaders included Sun Microsystems ( SUNW), up 3 cents to $6.03; Intel ( INTC), up 32 cents to $21.84; Level 3 Communications ( LVLT), up 30 cents to $6.33; Sirius Satellite Radio ( SIRI), down 6 cents to $3.92; Apple ( AAPL), down $1.34 to $95.66; Cisco Systems ( CSCO), up 20 cents to $28.88; and Microsoft ( MSFT), up 22 cents to $29.88.

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