By Benjamin Pimentel, MarketWatch

Shares of BlackBerry Ltd. rallied Tuesday on news that hedge fund Third Point, led by investor Dan Loeb, has acquired a huge stake in the struggling handset maker which also scored an upgrade from FBR Capital.

BlackBerry (RIMM) was up 5.4% to close at $9.46 after Third Point disclosed Friday that it has taken a 10-million-share stake in the mobile computing company.

On Tuesday, FBR Capital analyst Scott Thompson upgraded BlackBerry to market perform from underperform based on recent changes at the company, including "a refreshed management team that appears focused on forging a reasonably direct path to profitability" and "a slow, yet decisive and strategic shift away from the competitive consumer smartphone business into four more promising divisions."

The BlackBerry rally helped lift tech stocks as the Nasdaq Composite Index (RIXF) edged higher by 0.7% to close at 4,273. The Morgan Stanley High Tech 35 Index(MSH) and the Philadelphia Semiconductor Index (SOX) were each up a fraction.

Other gains came from Twitter Inc. (TWTR) , which rose 1.3% to close at $58.18 and Apple Inc.(AAPL), which added 0.4% to close at $545.99.

On the downside, shares of Hewlett-Packard (HPQ) were down 1.5% to close at $29.58, while Amazon.com (AMZN) slipped 1% to close at $353.65.

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