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NEW YORK (TheStreet) -- RATINGS CHANGES

Aaron's (AAN) - Get Aaron's Company Inc Report was upgraded to buy from hold at Keybanc. $34 12-month price target. New management is a positive change and the outlook is improving for the low-end consumer, Keybanc said.

Calpine (CPN) was upgraded to buy from hold at Deutsche Bank. Within the broader utility sector, merchant generators are favored over regulated names, said Deutsche. The power business specifically is on an improving track, Deutsche added.

Chegg (CHGG) - Get Chegg, Inc. Report was initiated at TheStreet Ratings as a hold. You can view the full analysis from the report here: CHGG Ratings Report.

Covanta (CVA) - Get Covanta Holding Corporation Report was downgraded to neutral from outperform at Robert Baird. This was a valuation call, Baird said.

Holly Frontier (HFC) - Get HollyFrontier Corporation Report was downgraded to market perform from outperform at Wells Fargo. Estimates were also cut, given lower expected industry margins, Wells Fargo said.

Marathon Petroleum (MPC) - Get Marathon Petroleum Corporation Report was downgraded to market perform from outperform at Wells Fargo. New global capacity will likely weigh on industry margins in the new year, Wells Fargo said.

VeriFone Systems (PAY) was upgraded to overweight from equal weight at Barclays. Fourth quarter results and guidance for double-digit organic revenue highlight strong tailwinds, Barclays said. 12-month price target was raised to $47 from $36.

PG&E (PCG) - Get PG&E Corporation Report was downgraded to hold from buy at Deutsche Bank. With Fed tightening on the horizon, regulated electrics are less attractive, said Deutsche.

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Portland General Electric (POR) - Get Portland General Electric Company Report was downgraded to hold from buy at Deutsche Bank. With Fed tightening on the horizon, regulated electrics are less attractive, said Deutsche.

Rackspace Hosting (RAX) was upgraded to buy at TheStreet Ratings. You can view the full analysis from the report here: RAX Ratings Report.

Stillwater (SWC) was upgraded to buy from neutral at Goldman Sachs. $19 12-month price target. The company is cutting costs and should benefit from higher palladium prices, Goldman said.

Suncoke Energy (SXC) - Get SunCoke Energy, Inc. Report was upgraded to outperform from neutral at Credit Suisse. This was a valuation call, based on a sum-of-the-parts target of $22 a share, Credit Suisse said.

Thermo Fisher (TMO) - Get Thermo Fisher Scientific Inc. Report was initiated with a buy rating at Keybanc. $144 12-month price target. The company is a major player and can continue to deliver steady organic growth, Keybanc said..

Verizon (VZ) - Get Verizon Communications Inc. Report was downgraded to neutral, Goldman Sachs said. $48 12-month price target. Estimates were also cut, as the industry is facing increased competition and higher spectrum costs, Goldman said. 

Zulily (ZU) was initiated at TheStreet Ratings as a sell. You can view the full analysis from the report here: ZU Ratings Report.

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This article was written by a staff member of TheStreet.