Analysts' Actions: GRPN, VRUS, MU, CVC

NEW YORK (TheStreet) -- CHANGE IN RATINGS

Amgen (AMGN) upgraded to buy at TheStreet Ratings.

BMC Software (BMC) was upgraded from underweight to neutral at JPMorgan. Valuation call, based on a $34 price target.

Continental Resources (CLR) was initiated with a buy rating at Dahlman Rose. $75 price target. Bakken shale should continue to drive growth.

DTE Energy (DTE) was upgraded from neutral to outperform at Credit Suisse. Improved state regulation should help drive earnings growth. $59 price target.

Gen-Probe (GPRO) was initiated with a buy rating at Deutsche Bank. $70.50 price target. Company is a market leader and new products should drive growth in 2012.

Groupon (GRPN) was initiated with a hold rating at Stifel Nicolaus. Stock is already discount several years of hyper growth.

Coverage of Groupon was started with an outperform rating at Barrington Research. $30 price target. Company is a market leader and has significant scale.

Kirby (KEX) was initiated with an overweight rating at Evercore. $74 price target. Double-digit EPS growth likely to continue through 2013 driven by strong demand fundamentals.

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Lazard (LAZ) was upgraded from neutral to outperform at Credit Suisse said. Valuation call, based on a $31 price target.

Louisiana-Pacific (LPX) was downgraded to reduce at TD Securities. Valuation call, as the stock is up 64% since October. $6.50 price target.

Coverage of Madison Square Garden (MSG) was started with a buy rating at Needham. $37 price target. Stock is attractive on a sum-of-the-parts basis.

Vail Resorts (MTN) was initiated with an outperform rating at Credit Suisse. $56 price target. Demand remains strong from high-end travelers.

Children's Place (PLCE) was downgraded from buy to neutral at Sterne Agee. Company is facing increased competition and merchandising could be hurt by weather trends. $60 price target.

Pinnacle West (PNW) was downgraded from outperform to neutral at Credit Suisse. Valuation call, based on a $52 price target.

Spirit Aerosystems (SPR) was upgraded from neutral to outperform at Credit Suisse. $27 price target. Company should generate positive free cash flow in 2012.

Torchmark (TMK) was upgraded from underperform to neutral at Credit Suisse. Valuation call.

Viropharma (VPHM) was initiated with a neutral rating at Goldman Sachs. $26 price target. Company lacks near-term catalysts.

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