NEW YORK ( TheStreet) -- PetSmart ( PETM) shares ticked lower late Wednesday after the Phoenix-based pet products retailer posted largely in-line results for its third quarter and gave a lukewarm outlook for the fourth quarter.

For the three months ended Sept. 30, PetSmart earned $45.6 million, or 38 cents a share, on sales of $1.4 billion, up 7.2% year-over-year. For the fourth quarter, the company forecast earnings of 71 to 75 cents a share with same-store sales growth projected in the mid-single digits. The average estimate of analysts polled by Thomson Reuters is for a profit of 73 cents a share in the December period.

The stock was last quoted at $37.50, down 2%, on volume of more than 250,000, according to Year-to-date, the shares are up 41% based on their regular-session close at $38.28.

Meantime A-Power Energy Generation Systems ( APWR) fell as well in extended trades, sliding more than 8% to $6.03 on volume of almost 60,000.

The Chinese wind turbine manufacturer postponed a planned conference call about its third-quarter results after the close, providing no explanation for the change. A-Power originally announced plans for the Nov. 18 conference call on Tuesday.

"The postponement was not due to any accounting irregularities," A-Power said in a terse press release. "The Company regrets any inconvenience that the postponement may have created."

On the plus side was Dendreon ( DNDN), which gained 6% to $37.94 on volume of more than 1.1 million. The Seattle biotech was halted for much of the regular session, and then re-opened in after-hours action, surging on news that a panel of outside advisors to the Medicare program were in favor of reimbursement for the company's Provenge prostate cancer drug. NetApp ( NTAP) edged higher in after-hours action, regaining some of the ground the stock lost in the regular session after its fiscal second-quarter report leaked prior to the closing bell.

The Sunnyvale, Calif.-based data storage technology company reported non-GAAP earnings of $202.7 million, or 52 cents a share, for the three months ended Oct. 31 with revenue coming in at $1.21 billion. That performance was slightly ahead of Wall Street's consensus view for a profit of 49 cents a share in the period on revenue of $1.19 billion.

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