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Updated from 9:44 a.m.


dropped 13% Friday after one of the company's best-known backers liquidated his stake.

Dallas Mavericks owner Mark Cuban reported the move in a schedule 13-G filing Thursday with the

Securities and Exchange Commission

. Cuban previously reported a 6.3% stake, with beneficial ownership at March 4 of 600,000 common shares of the Montreal-based company.

"I bought the company because they were focused on growing organically," Cuban told

in a Friday email. "They decided they wanted to grow through acquisitions, and to also do additional equity placements that would lead to dilution of existing shareholders. I didn't see that as the best approach, so I sold my shares."

The news comes just two days after the search engine operator sold $16.6 million worth of stock and warrants at a discount in a private placement. Mamma said at the time it would use the cash for acquisitions. shares have enjoyed a wild ride over the last year. Interest in the company, which competes with Internet giants ranging from



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, surged in March after Cuban said he took a stake in the company. Cuban is highly regarded among Net investors because he sold to



for $4 billion during the turn-of-the-century tech boom.

Shares of Mamma had generally traded in the low single digits before then, but early March brought a day when the stock

jumped 155% in mind-boggling volume. The SEC said soon after that it was examining trading in

On Friday, the stock slipped $1.49 to $10.33.