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

NEW YORK (

TheStreet

) --

CHANGE IN RATINGS

Amazon.com

(AMZN) - Get Report

downgraded at UBS from Buy to Neutral, UBS said. New video streaming service will cut into margins. $180 price target.

Community Health

(CYH) - Get Report

upgraded at UBS to Buy, UBS said. Payer mix is improving. $50 price target.

Emergency Medical Services

(EMS)

downgraded at Citi to Hold from Buy. Company entered into a definitive agreement to merge with private equity firm Clayton, Dubilier & Rice for $64/share.

Frontier Oil

(FTO)

upgraded at Barclays to Equal Weight from Underweight. Attractive valuation and potential merger in near future, Barclays said. Maintain $28 price target.

Health Management

(HMA)

upgraded at UBS from Neutral to Buy, UBS said. $11.50 price target. Commercial mix headwind should begin to dissipate.

Humana

(HUM) - Get Report

upgraded at Stifel from Hold to Buy, Stifel Nicolaus said. $79 price target. Near-term operational risks have subsided.

Humana

(HUM) - Get Report

upgraded at Jefferies from Hold to Buy. $74 price target. Company should benefit from the Tricare contract extension.

IPG Photonics

(IPGP) - Get Report

downgraded at Needham from Buy to Hold, Needham said. Valuation call.

IPG Photonics

(IPGP) - Get Report

downgraded at Barclays to Equal Weight from Overweight. Valuation too rich, Barclays said. Maintain $60 price target.

Johnson Controls

(JCI) - Get Report

rated new Neutral at Piper. $46 price target. Stock is already pricing in growth potential.

Lifepoint Hospitals

(LPNT)

upgraded at UBS from Neutral to Buy, UBS said. $47 price target. Pricing is improving, despite Medicaid.

Medicis Pharmaceutical

(MRX)

upgraded at JP Morgan from Neutral to Overweight, JP Morgan said. $35 price target. Risk/reward is improving at current levels.

Medicis Pharmaceutical

(MRX)

upgraded at Piper from Neutral to Overweight, Piper Jaffray said. $38 price target. Visibility is improved, following the Teva settlement.

Procter & Gamble

(PG) - Get Report

downgraded at BMO from Outperform to Market Perform, BMO Capital said. $70 price target. Company could be hurt by cost inflation and rising gas prices.

Resources Connection

(RCEN)

upgraded at Barclays to Overweight from Equal Weight. Temp employee remain strong, expect revenues and profits to accelerate materially in 2011, Barclays said.

Sempra Energy

(SRE) - Get Report

downgraded at Barclays to Equal Weight form Overweight. Uncertainties related to CA regulation and commodity prices impacting gas storage, Barclays said. Price target lowered to $55 from $57.

Seagate Technology

(STX) - Get Report

downgraded at JP Morgan from Neutral to Underweight, JP Morgan said. $11.50 price target. Company could lose market share in a weak demand environment.

Tenet Healthcare

(THC) - Get Report

upgraded at UBS from Neutral to Buy, UBS said. $8.25 price target. Estimates were also boosted.

Wolverine World Wide

(WWW) - Get Report

rated new Buy at Keybanc. $44 price target. Company has pricing power and can generate consistent high single-digit annual sales growth.

This article was written by a staff member of TheStreet.