Analysts' Actions: AAPL FUEL OXY TWTR VSI

NEW YORK (TheStreet) -- RATINGS CHANGES

Apple (AAPL) was downgraded at ISI Group to buy from strong buy. Valuation call, based on a 12-month price target of $675, ISI Group said.

Comstock (CRK) was downgraded at FBR Capital Markets to market perform from outperform. Valuation call, FBR Capital Markets said.

Covanta (CVA) was upgraded at Barclays to overweight from equal weight. Driven by EU's rejection of challenges to company's waste project, Barclays said. Twelve-month price target is $22.

Laredo Petroleum (LPI) was upgraded to buy at TheStreet Ratings.

Rocket Fuel (FUEL) was downgraded at Goldman Sachs to neutral from buy. Twelve-month price target is $25. Average customer spending is declining, Goldman Sachs said.

Rocket Fuel downgraded at BMO Capital to market perform. Twelve-month price target is $25. Company reduced its guidance, BMO Capital said.

Intersil (ISIL) was upgraded at Citigroup to neutral from sell. Twelve-month price target is $14. Computing market is beginning to stabilize, Citigroup said.

KT Corp. (KT) was downgraded to sell at TheStreet Ratings.

Allscrips-Misys (MDRX) was upgraded at ISI Group to buy from neutral. Twelve-month price target is $19. Company has strong earnings momentum, but the stock is down 24% from its highs, ISI Group said.

ON Semiconductor (ONNN) was downgraded at Citigroup to sell from neutral. Recent checks suggest a downtick in bookings, Citigroup said.

Occidental Petroleum (OXY) was upgraded at Citigroup to buy from neutral. Twelve-month price target is $111. Restructuring should unlock shareholder value, Citigroup said.

RenaissanceRe (RNR) was downgraded at UBS to neutral from buy. Valuation call with 12-month price target of $105, UBS said.

Southwest Gas (SWX) was downgraded at Brean Murray to hold from buy. Cold weather has disrupted business, Brean Murray said.

Teradata (TDC) was downgraded at William Blair to outperform from market perform. Company lacks near-term catalysts, William Blair said.

Teradata was downgraded at Stifel Nicolaus to hold from buy. Company cut its guidance, Stifel Nicolaus said.

Twitter (TWTR) was upgraded at Bank of America/Merrill Lynch to neutral from underperform. Valuation call, based on a 12-month price target of $36, BofA/Merrill said.

Ubiquiti (UBNT) was downgraded at Wedbush to neutral from outperform. Twelve-month price target is $41. Inventory is rising, Wedbush said.

Vitamin Shoppe (VSI) was upgraded at Barclays to overweight from equal weight. Driven by ability to diversify growth and management abilities, Barclays said. Twelve-month price target is $51.

Wisconsin Energy (WEC) was downgraded at UBS to sell from neutral. Valuation call with 12-month price target of $44, UBS said.

WPX Energy (WPX) was upgraded at Deutsche Bank to buy from hold. Twelve-month price target is $28. Company is at an important inflection point, Deutsche Bank said.

Editor's note: To see analysts' stock comments and changes to price targets and earnings estimates, go to "Street Notes" which is available only to Real Money subscribers. To find out how to become a subscriber, please click here.

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This article was written by a staff member of TheStreet.

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