Investors and traders are usually on the lookout for new research ideas that will generate higher income or more profits. 24/7 Wall St. reviews many analyst research calls from Wall Street and from boutique firms to find great ideas in value stocks, growth stocks and dividend stocks. Some are stocks to buy, while some ideas are even stocks to sell. These are 10 of the top analyst upgrades, downgrades and initiations seen from select Wall Street research calls this Friday.

Alpha Natural Resources Inc. (NYSE: ANR) was raised to Buy from Hold at Deutsche Bank; shares are indicated up 2%.

CoreLogic Inc. (NYSE: CLGX) was upgraded to Outperform from Sector Perform at Keefe Bruyette and Woods.

Dollar General Corp. (NYSE: DG) is trading down 3% after Goldman Sachs issued a new Neutral rating on the stock.

F5 Networks Inc. (NASDAQ: FFIV) was upgraded to Overweight from Neutral at Piper Jaffray.

Kroger Co. (NYSE: KR) was downgraded to Sell from Neutral and the price target was cut to $3 from $53 at Goldman Sachs.

Pfizer Inc. (NYSE: PFE) was downgraded to hold at Jefferies after surging short interest report.

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SodaStream International Ltd. (NASDAQ: SODA) was downgraded to Perform from Outperform at Oppenheimer.

Sprint Nextel Corp. (NYSE: S) was started as a Neutral rating and $7 price target at J.P. Morgan.

Target Corp. (NYSE: TGT) was downgraded to Hold from Buy at Deutsche Bank.

VMware Inc. (NYSE: VMW) was downgraded to Equal Weight from Overweight and the price target was cut to $75 from $85 by Evercore.

Cowen & Co. issued a list of eight biotech stocks to buy that it thinks will win this earnings season.

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