Travelzoo Chief Executive Ralph Bartel is cashing in on this year's 74% run-up in the online travel search engine's shares.

Since April 24, Bartel has sold 2.27 million shares of New York-based Travelzoo for a net value of $92.9 million through investment vehicles he controls, according to Ben Silverman, research director of InsiderScore.com, which tracks insider sales. This is Bartel's biggest share sale since 2004, when he sold 150,000 shares.

Bartel, who also is Travelzoo's founder, chairman and chief financial officer, still holds about 10.5 million shares of the company, which has 16 million shares outstanding. Officials from the company couldn't immediately be reached for comment.

"For a company this closely held by one insider, this is a highly unusual amount of open-market selling," says Silverman.

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