NEW YORK (

TheStreet

) --

CHANGE IN RATINGS

Accretive Health

(AH)

was upgraded from Perform to Outperform at Oppenheimer. $31 price target. Well-positioned to meet or exceed revenue expectations for 2012, Oppenheimer said.

AIMCO

(AIV) - Get Report

was upgraded at UBS from Sell to Neutral. $21 price target. Waning demand trends are priced into shares, UBS said.

Calpine

(CPN)

was downgraded at Jefferies from Buy to Hold. $15 price target. Weakened price forecasts for gas and power, Jefferies said.

Electronic Arts

( ERTS) was upgraded at Citigroup from Neutral to Buy. $26 price target. Valuation call, Citigroup said.

McDermott

(MDR) - Get Report

was initiated with a Buy rating at Stifel Nicolaus. $16 price target. Company is seeing a solid pricing environment, Stifel Nicolaus said.

Navistar

(NAV) - Get Report

was upgraded at Goldman Sachs from Sell to Neutral. Valuation call, based on a $38 price target, Goldman said.

Netflix

(NFLX) - Get Report

was downgraded at Wedbush Securities from Neutral to Underperform. $45 price target. Company continues to face higher content costs, Wedbush said.

OneBeacon Insurance

(OB)

was upgraded to Buy at TheStreet Ratings.

Rada Electronics Industries

(RADA) - Get Report

was downgraded to Sell at TheStreet Ratings.

Transocean

(RIG) - Get Report

was downgraded at Argus Research from Buy to Hold. Company had a weak November fleet report, and the share raise will dilute earnings, Argus said.

Vulcan Materials

(VMC) - Get Report

was downgraded at Goldman Sachs to Sell. $29 price target. Company could face excess capacity in concrete and asphalt mix, Goldman said. $29 price target.

STOCK COMMENTS / EPS CHANGES

Avago Technologies

(AVGO) - Get Report

numbers were adusted at Citigroup. Shares are now seen reaching $41. Estimates were lowered as industrial creates N/T Rev/GM headwinds, Citigroup said. Buy rating.

Copart

(CPRT) - Get Report

estimates, target were raised at ThinkEquity. Shares are now seen reaching $48. Estimates were also increased, as the company is investing into potential future growth, ThinkEquity said. Hold rating.

Corning

(GLW) - Get Report

estimates were reduced at Morgan Stanley through 2013. Company is seeing lower demand for its gorilla glass, Morgan Stanley said. Equal-weight rating.

Corning estimates, target lowered at UBS. Shares are now seen reaching $17. Estimates were also decreased as Gorilla guided down 25% on weak tablet demand, UBS said. Buy rating.

Corning estimates, target lowered at Citigroup. Shares are now seen reaching $14, according to Citigroup. Estimates also lowered on another negative pre-announcement.

Home Depot

(HD) - Get Report

estimates, target were increased at UBS. Shares are now seen reaching $45. Estimates were also increased on upbeat assessment of both its near-term and longer-term outlooks. Buy rating.

Northeast Utilities

(NU)

numbers were increased at UBS. Shares are now seen reaching $35. Estimates were also increased on recent group moves, UBS said. Neutral rating.

Transocean

(RIG) - Get Report

estimates, target were cut at Guggenheim Securities. Shares of RIG are now seen reaching $50. Estimates were also cut, given higher operating costs and dilution from the recent stock offering, Guggenheim said. Neutral rating.

Transocean estimates, target lowered at UBS. Shares are now seen reaching $62. Estimates also lowered as liquidity crunch drives equity deal, UBS said. Buy rating.

Semtech Corporation

(SMTC) - Get Report

estimates were lowered at Oppenheimer through 2013. The overall demand environment remains challenged, Oppenheimer said. Outperform rating.

UnitedHealth Group

(UNH) - Get Report

estimates were raised at UBS through 2012. $58 price target. Commercial outlook appears conservative, UBS said. Buy rating.

UnitedHealth Group numbers were raised at Jefferies. Shares are now seen reaching $60. Estimates were also raised on upbeat investor day, Jefferies said. Buy rating.

>To submit a news tip, email:

tips@thestreet.com

.

RELATED STORIES:

>>Stocks to Watch: Goldman, Pfizer, Omnivision

>>Facebook Privacy, Google Maps: Hot Trends

Follow

TheStreet

on

Twitter

and become a fan on

Facebook.

This article was written by a staff member of RealMoney.com.