NEW YORK, N.Y. - Tableau Software shares soared in their trading debut Friday after the company and some of its investors raised about $254.2 million in its initial public offering. Seattle-based Tableau Software Inc. provides software that helps businesses convert data into visual presentations. The shares jumped $17.50, or 56 per cent, to $48.50 in morning trading. Earlier, the company sold 5 million shares for $31 each and total proceeds of $155 million. Certain shareholders sold an additional 3.2 million shares at the same price for $99.2 million.

BEACHWOOD, Ohio - DDR Corp. is buying 30 of 44 U.S. shopping centres from a joint venture it has with private equity firm Blackstone Group LP in a deal worth $1.46 billion, saying it expects to make money by raising rents at the malls and redeveloping them. They include centres in Boston, Chicago, Washington and Minneapolis among others.

Dell's largest independent shareholder has teamed with activist investor Carl Icahn in another challenge to founder Michael Dell's $24.4 billion bid to take the struggling computer maker private. Southeastern Asset Management and Icahn said in a letter sent Thursday to the Dell Inc. board that they want to let shareholders keep their stock and give them either $12 per share in cash or additional shares in a deal that keeps the company publicly traded. They said this would give shareholders a stake in future gains made by the Round Rock, Texas, company.

PETALUMA, Calif. - Shares of Cyan Inc. fell slightly in their trading debut after the company raised $88 million in an initial public offering. In midday trading, Cyan shares fell 4 cents to $10.96, after initially dropping as low as $9.96. Earlier, the company sold 8 million shares for $11 each in the IPO. In addition, the offering's underwriters — Goldman, Sachs Petaluma, Calif.-based Cyan provides a software-driven transport and switching platform for network operators. Its shares are being traded on the New York Stock Exchange under the symbol "CYNI."