By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- EBay Inc. was one of the most-notable gainers in the tech sector Monday, as the online retailer's shares climbed even as activist investor Carl Icahn set his sights on the company and what he views as irresponsibility on the part of its board of directors.

EBay (EBAY) rose 3% to close at $56.30 a share, even after Icahn issued what he called "An Open Letter To EBay Stockholders," in which he said his research has "discovered multiple lapses in corporate governance. These include certain material conflicts of interest, which we believe could put the future of our company in peril."

Last month, Icahn disclosed he has taken a 2% stake in eBay and was ready to lead a proxy fight aimed at getting two seats on eBay's board of directors and spinning off the company's PayPal digital-payments business.

Icahn went on to slam eBay independent director Marc Andreessen, saying he "engaged in several transactions that lead us to question his loyalty to eBay." Icahn also said eBay Chief Executive John Donahoe "appears to lack awareness about what is going on around him on his board and in the marketplace," and called Donahoe's leadership of eBay "myopic."

EBay responded to Icahn, saying that the billionaire investor "has cherry-picked old news clips and anecdotes out of context to attack the integrity" of Andreessen and another eBay director, former Intuit Inc. (INTU) CEO Scott Cook. EBay also defended Donahoe, saying he is "widely respected for his turnaround of eBay and leadership of the company over the past six years."

BlackBerry Inc. (RIMM) also had a strong day, as its shares rose almost 8%, to $9.83. The smartphone company said it would begin making its BBM messaging service available to the Microsoft (MSFT) Windows Phone platform this summer, and also to the upcoming Nokia X platform.

RF Micro Devices Inc. (RFMD) surged 21% to close at $7.03 a share after the radio frequency chipmaker said it will acquire TriQuint Semiconductor Inc. (TQNT) in an all-stock deal valued at $1.6 billion. The move is seen as improving RF Micro's efforts in the mobile-handset market.

Netflix Inc. (NFLX) rose 3.4%, to end the day at $447 a share a day after the online video-streaming company said it reached a new traffic service agreement with Comcast Corp. (CMCSA). Financial terms weren't disclosed, but Netflix will now be able to connect directly to Comcast's broadband network, with the goal of being able to provide better video-streaming service to its subscribers.

The Nasdaq Composite Index (RIXF) rose 29 points to close at 4,292, and the Philadelphia Semiconductor Index (SOX) also ended the day in positive territory.

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