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

NEW YORK (

TheStreet

) --

CHANGE IN RATINGS

Boston Scientific

(BSX) - Get Report

upgraded at RBC to Outperform, RBC Capital said. $8 price target. New products should help expand margins.

Cerner

(CERN) - Get Report

rated new Outperform at FBR Capital Markets. $121 price target. Company can deliver consistent organic growth.

Chesapeake Midstream Partners

( CHKM) upgraded at BofA/Merrill to Buy from Neutral. Valuation call, Bank of America/Merrill Lynch said. Price target raised by a dollar to $29.

Casella Waste Systems

(CWST) - Get Report

initiated at BoA/Merrill with a Neutral rating and $8 price target following a debt refinancing and pending asset sale, Bank of America/Merrill Lynch said.

DigitalGlobe

(DGI)

downgraded at Merriman from Buy to Neutral. Company is facing higher costs to add capacity.

Dril-Quip

(DRQ) - Get Report

upgraded at Wells from Market Perform to Outperform, Wells Fargo said. Risk/reward is more attractive at the current valuation.

Dril-Quip

(DRQ) - Get Report

numbers lowered at Morgan Stanley. Shares of DRQ now seen reaching $85, according to Morgan Stanley. Estimates also cut, to match the company's new guidance. Equal-weight rating.

Expeditors International

(EXPD) - Get Report

upgraded at UBS from Neutral to Buy, UBS said. $59 price target. Valuation call, as the stock has pulled back 16% from its December highs.

Las Vegas Sands

(LVS) - Get Report

upgraded at Credit Suisse to Outperform from Neutral given superior Asian growth platform, Credit Suisse said. Price target raised to $56 from $48.

MercadoLibre

(MELI) - Get Report

rated new Buy at Brean Murray. $76 price target. Brazil should be a major growth driver for the company.

Regis

(RGS) - Get Report

rated new Outperform at Oppenheimer. Company has an attractive 12% dividend yield.

Range Resources

(RRC) - Get Report

downgraded at FBR from Outperform to Market Perform, FBR Capital Markets said. $55 price target. Valuation call, as the stock has outperformed its peers by 35% over the past six months.

Solarwinds

(SWI) - Get Report

rated new Market Perform at Morgan Keegan. $20 price target. Product growth is decelerating.

Southwestern

(SWN) - Get Report

downgraded at BofA/Merrill to Underperform as next catalysts appear to be towards the back end of 2011, Bank of America/Merrill Lynch said. Price target lowered to $35 from $41.

Windstream Communications

(WIN) - Get Report

upgraded at Citi to Buy from Hold on stronger revenue growth, Citigroup said. Price target raised by a dollar to $15.

This article was written by a staff member of TheStreet.