By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Two classes of Google Inc. shares created after a 2-for-1 stock split rose sharply as they began trading Thursday.

The new class of non-voting Class C shares(GOOG) trading under "GOOG" climbed 2.5% to $580.89, while Class A shares (GOOGL) trading under the new ticker "GOOGL" gained 2.4% to $582.41. Shareholders received the two shares for every Class A stock they owned.

Google implemented the stock split, which became official after Wednesday's closing bell, as a way to make it easier for founders Larry Page and Sergey Brin maintain control of the Internet giant.

At least two analysts reaffirmed a buy rating on the stock given Google's dominant market position and robust financials.

"We remain positive on shares of Google given our expectations for continued search strength, strong mobile position, and an attractive valuation," Raymond James analyst Aaron Kessler told clients in a note in which he kept an outperform rating. Kessler set a price target of $660.

Topeka Capital's Victor Anthony also maintained an outperform rating on Google, telling clients, "While there is no change to net income from the share split, we are increasing pro-forma earnings estimates to reflect the move of Motorola operating losses to discontinued operations. In addition, we are doubling the number of shares outstanding due to the split."

Anthony set his 2014 earnings per share estimate at $27.30 and his 2015 earnings per share target at $30.94. He maintained an outperform rating with a split-adjusted $675 price target.

The tech sector also got a boost from shares of Pandora Media (P), which were up 2% after the Internet radio company reported stronger listener gains in March.

But the sector was weighed down by shares of Twitter Inc. (TWTR) , which were down nearly 2%, and Microsoft Corp.(MSFT) , which was off 1%. Hewlett-Packard (HPQ) and Apple Inc. (AAPL) were each down a fraction.

The Nasdaq Composite Index(RIXF) was off 0.2% at 4,266. The Morgan Stanley High Tech 35 Index (MSH) shed a fraction, while the Philadelphia Semiconductor Index (SOX) climbed nearly 1%.

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