UPDATE 1-Constant Contact shares soar in market debut

(Adds market capitalization, use of proceeds, updates share price)

NEW YORK, Oct 3 (Reuters) - Shares of Constant Contact Inc (CTCT.O) jumped as much as 75 percent in their market debut on Wednesday, a day after the provider of Web-based e-mail marketing software raised $107 million in an initial public offering that priced above the forecast range.

The shares rose as high as $28.01 in late-morning trading, far above the IPO price of $16. They later pulled back to $26.50.

On Tuesday the 6.7 million-share IPO priced $2 above its forecast range of $12 to $14 a share -- an indication that demand was strong.

At a share price of $26.50, the company has a first-day market capitalization of $715.50 million.

Based in Waltham, Massachusetts, Constant Contact plans to use proceeds from the offering for general corporate purposes, including to fund growth.

Underwriters, led by CIBC World Markets and Thomas Weisel Partners, have an option to purchase an additional 1 million shares to cover over-allotments, according to an amended filing with the U.S. Securities and Exchange Commission. (Reporting by Lilla Zuill)