The online travel stock surged 10% Monday, adding to an eye-popping weeklong runup since last Tuesday's earnings blowout. The stock has now risen nearly 150% over the five sessions since the company beat first-quarter earnings estimates by a dime.

Two years ago, Travelzoo was one of Wall Street's top-performing stocks, peaking at $110 a share in late December 2004. Shares of the New York-based publisher jumped $4.53 to $48.88 Monday, after earlier touching $52.25. Travelzoo declined to comment.

Travelzoo's latest move is from "a good quarter and a short squeeze," says Scott Devitt, an analyst with Stifel Nicolaus, in an email. He is one of three analysts to officially follow the stock. He rates the shares a hold.

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