Constant Contact ( CTCT), a provider of on-demand email marketing services, climbed sharply in its debut after pricing a 6.7 million-share initial public offering at $16 each.

Shares of Constant Contact were up $14.30, or 89%, at $30.30 in afternoon trading Wednesday.

The company is selling about 5.8 million shares, and stockholders are selling the rest. The underwriters were granted a 30-day option to purchase up to an additional 1 million shares to cover any overallotments.

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