Piper Jaffray Downgrades Priceline.com

Analyst Aaron Kessler believes it will become increasingly difficult for the travel website to outperform the market

Piper Jaffray downgrades Priceline.com (PCLN ) to market perform from outperform.

Analyst Aaron Kessler says while the company's first-quarter was essentially in line with estimates, he's concerned with the declining growth rates of the domestic online travel market.

He also notes while Priceline.com has been largely immune due to new product offerings and differentiated offering, he believes it will become increasingly difficult for it to outperform the market, especially as it anniversaries its product enhancements.

Kessler lowered his rating over slowing growth and belief that the shares are fully valued, and trimmed his $30 target to $29. He says earnings per share estimates essentially are unchanged due to lower-than-anticipated operating expenses and a lowered effective tax rate.

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