Editor's Note: Green and red arrows refer to intraday stock price movement.

NEW YORK ( TheStreet) -- CHANGE IN RATINGS

Analog Devices ( ADI) rated new Neutral at Sterne Agee. Valuation call, although the company has little PC exposure and should continue to generate solid growth.

AthenaHealth ( ATHN) downgraded at Morgan Stanley from Equal-weight to Underweight. $26 price target. New analyst believes that the stock is trading at too large of a premium to its peers.

Coca-Cola Enterprises ( CCE) reinstated at Credit Suisse with an Outperform rating and $25 price target. CCE undervalued relative to large Coke bottlers.

Cognex ( CGNX) downgraded at Piper to Neutral. Valuation call, as the company is already trading at 18x expected 2011 earnings.

Comerica ( CMA) upgraded at Deutsche to Buy. Company has less housing risk and more exposure to a recovery in commercial lending.

Chipotle ( CMG) downgraded at Deutsche from Buy to Hold. Valuation call, based on a $184 price target.

Danaher ( DHR) rated new Buy at Jefferies. $52 price target. Company is positioned well to deliver organic growth.

Equinix ( EQIX - Get Report) downgraded at Citigroup from Buy to Hold. $94 price target. Sales growth is likely to decelerate in 2011.

Equinix ( EQIX - Get Report) downgraded at Wells to Market Perform. Company cut its guidance, because of higher customer churn.

Equinix ( EQIX - Get Report) downgraded at Oppenheimer to Perform. Company is facing increased competition and cut sales guidance.

First Horizon ( FHN - Get Report) upgraded at Deutsche to Buy. Company has a strong capital position and exposure to a recovery in commercial lending.

Halozyme Therapeutics ( HALO) initiated at Barclays with an Overweight rating and $12 price target. HALO's Enhanze technology is attractive, Barclays said.

Humana ( HUM) rated new Positive at Susquehanna. $62 price target. Company should be able to gain market share, especially in Medicare Advantage.

Iron Mountain ( IRM) downgraded at Wells Fargo from Outperform to Market Perform. Sales and EBITDA appear to be tracking at the low end of expectations.

Key Energy ( KEG) rated new Outperform at Oppenheimer. $13 price target. Company is tapped into long-term secular growth trends.

Coca-Cola ( KO - Get Report) reinstated at Credit Suisse with an Outperform rating. There has never been a better time to be a Coke bottler. Price target increased to $70 from $62.

Lubrizol ( LZ) upgraded at Citigroup from Hold to Sell. $115 price target. Company held an upbeat analyst meeting and has pricing power in lubricants.

Nabors Industries ( NBR - Get Report) rated new Perform at Oppenheimer. Company is the world's largest land driller, but has exposure to a soft natural gas market.

Petroleo Brasileiro ( PBR - Get Report) downgraded at Barclays to Equal Weight from Overweight as a result of the dilutive effects from the company's recent equity transaction. Price target sunk to $35 from $40.

Patriot Coal ( PCX) downgraded at Brean Murray from Buy to Hold. Company will likely be hurt by lower pricing for met coal.

Perkin Elmer ( PKI) rated new Hold at Jefferies. $26 price target. Market is waiting to see how the company will deploy the capital raised from the recent asset sale.

Prudential ( PRU - Get Report) upgraded at Barclays. PRU upgraded to Equal Weight from Underweight. Optimistic about PRU's decision to acquire AIG's Star Life Insurance Company and AIG Edison Life Insurance Company, two major life subsidiaries in Japan. Price target raised a dollar to $61.

Pioneer Natural ( PXD) rated new Buy at Keybanc. $90 price target. Recent initiatives to deepen wells is improving returns.

Sandrige ( SD) rated new Hold at Keybanc. Valuation call, as the stock has already bounced back 28% over the past month.

Sirona Dental ( SIRO) downgraded at Jefferies from Buy to Hold. $40 price target. New analyst believes that the stock is already pricing in potential market share gains.

Dentsply ( XRAY) rated new Buy at Jefferies. $40 price target. Company should be able to leverage its scale and sell more value-added products.

STOCK COMMENTS / EPS CHANGES

Ansys ( ANSS) estimates, target lowered at Jefferies. Shares of ANSS now seen reaching $47. Estimates also cut, following poor domestic channel checks. Buy rating.

Bemis ( BMS) target upped at Citigroup to $40. Company should post above-average profit growth and currently trades at just 12.5x expected 2011 earnings. Buy rating.

CME Group ( CME) numbers reduced at Morgan Stanley. Shares of CME now seen reaching $298. Estimates also cut, given lower trading volumes. Underweight rating.

Huntsman ( HUN) estimates, target boosted at Jefferies. Shares of HUN now seen reaching $12. Estimates also upped, given better pricing trends for pigments and polyurethanes. Hold rating.

Mosaic ( MOS) price target boosted at Barclays to $60 from $54 after their bullish 1Q11 conference call. Maintain Equal Weight rating.

Panera Bread ( PNRA) target raised at Deutsche. Shares of PNRA now seen reaching $100. Channel checks suggest strong sales and the company could continue to expand margins. Buy rating.

Plains Exploration ( PXP) numbers increased at Goldman. PXP estimates were raised through 2012. Eagle Ford shale deal should add to earnings. Neutral rating and new $32 price target.

Charles Schwab ( SCHW) estimates lowered at UBS through 2011. Company is seeing lower customer trading activity. Buy rating and $21 price target.

Success Factors ( SFSF) target raised at FBR to $32. Recent checks point toward continued sales momentum. Outperform rating.

UnitedHealth ( UNH) target boosted at Morgan Stanley to $42. Company should continue to see services growth. Overweight rating.

Urban Outfitters ( URBN) numbers cut at Piper. URBN estimates were reduced through 2012. Higher promotional activity could weigh on margins. Neutral rating and new $31 price target.

This article was written by a staff member of TheStreet.