Cloud computing company Workday ( WDAY) soared on its trading debut on Friday, as investors flocked to the latest technology offering.

Shares opened for trading at $48.05, a jump of 72% above its $28 offering price. For the six months ended July 31, Workday had sales of $119.5 million, up 118% ($54.8 million) from the year-earlier period. Though revenue is growing exceptionally fast, losses are also growing. Losses in the same period widened to $1.40 share from $1.27.

Workday's shares closed the week at $48.69, a 74% gain over its IPO price.

Amazon ( AMZN) CEO Jeff Bezos said in an interview what Wall Street has known all along. It doesn't make any money from its devices; it sells them at cost.

In an interview with the BBC, Bezos said the Kindle Fire and Paperwhite e-reader don't turn a profit, but they do break even.

Shares of Amazon plunged 6.2% this week to finish at $242.36.

AMD ( AMD) fell after it reported weaker-than-expected revenue on Thursday, as the PC market continues to decline.

AMD expects third-quarter revenue of approximately $1.27 billion, down 10% sequentially. AMD previously expected revenue to fall 1%, plus or minus 3%, sequentially. Analysts surveyed by Thomson Reuters were looking for sales of $1.38 billion.

"The lower than anticipated preliminary revenue results are primarily due to weaker than expected demand across all product lines caused by the challenging macroeconomic environment," AMD said in a press release.

AMD, which reports official results Oct. 18, fell 15% this week to close at $2.74.

Next week earnings season is in full swing, with reports from big names such as Amazon ( AMZN), IBM ( IBM), Google ( GOOG), Microsoft ( MSFT) and eBay ( EBAY), which recently refreshed its Web site, making it cleaner and easier to navigate.

Interested in more on eBay? See TheStreet Ratings' report card for this stock.

-- Written by Chris Ciaccia in New York

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