By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) --Gains from Facebook Inc. highlighted activity in the tech sector Tuesday, as the social network announced a new program for publishing mobile games and its shares closed just 37 cents shy of their IPO price from over a year ago.

Facebook (FB) shares closed with a gain of $2.20, or more than 6%, at $37.63, to almost match the $38-a-share price the company set for its IPO in May 2012. The stock has been on a tear since reporting quarterly results on July 24 that exceeded Wall Street analysts' forecasts.

In less than a week since that report, Facebook's stock has risen more than 41%.

In a blog posting on Tuesday, Facebook said it was launching a pilot program called Facebook Mobile Games Publishing in an effort to aid small-and-medium sized mobile-game developers, in exchange for a cut of the revenue generated from those games.

"Through the program, we will work with select game developers and provide promotional support for their games in placements across our mobile apps," Facebook said in the blog post.

Sprint Corp. and CommVault Systems Inc. were also having a good day in the wake of their quarterly results.

Sprint (S), the No. 3. mobile-phone carrier in the U.S., rose 7.3%, to $6.16 a share after the company reported a quarterly loss that grew from the year-ago period due to costs associated with closing down its Nextel network. Sprint, which also sold almost 80% of its shares to Japan's SoftBank Corp., said it lost more customers in the quarter than several analysts had forecast.

CommVault (CVLT) posted one of the tech sector's strongest gains, as its shares rose 9.6% to end the day at $85.04. Before the market opened, the enterprise data storage provider reported a quarterly profit of 40 cents a share, on $134.4 million in revenue, to top the estimates of Wall Street analysts, who forecast CommVault to earn 35 cents a share on sales of $132.2 million.

Harris Corp. (HRS) climbed almost 8% to $56.97 a share after the communications-equipment maker reported better-than-expected quarterly results before the start of trading.

The Nasdaq Composite Index (RIXF) ended the day with a gain of 17 points to close at 3,616, while the Philadelphia Semiconductor Index (SOX) rose 1.2% and the Morgan Stanley High Tech 35 Index (MSH) also advanced.

Declines came from PMC-Sierra Inc. (PMCS), which fell 6% to $6.59 a share. After Monday's market close, the chipmaker reported a second-quarter loss that grew from the year-ago quarter and its sales fell below Wall Street analysts' forecasts.

Corning Inc. (GLW) shares gave up 1.3% to close at $15.19. Before the market opened, Corning reported a 35% increase in second-quarter earnings as it said it benefited from increased sales of its Gorilla Glass for smartphones.

SanDisk Corp. (SNDK) shed 1.6% to close at $54.53. Goldman Sachs analyst James Schneider cut his rating on the flash memory chipmaker to neutral, saying that "greater NAND supply may be added in the next few quarters than we previously assumed, which could drive meaningful near-term price declines."

Symantec Corp. (SYMC) shares closed with a gain of 1.5%, and Carbonite Inc. (CARB) edged up almost 1%, while Take-Two Interactive Software Inc. (TTWO) shares added 2 cents to end the day at $16.99. All three companies reported quarterly results after the close of trading.

 
 

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