NEW YORK (TheStreet) -- RATINGS CHANGES

Computer Sciences ( CSC) was upgraded at Wells Fargo to outperform from market perform. Spinoff strategy can drive the stock to more than $80, Wells Fargo said.

eBay (EBAY) was initiated with a buy rating at Topeka Capital. Valuation call ahead of the PayPal spin, Topeka said. Twelve-month price target is $68.

Frontier (FTR) was upgraded at Morgan Stanley to overweight from underweight. Valuation call, given the attractive dividend yield, Morgan Stanley said. Twelve-month price target is $6.

Greif (GEF) was downgraded at DA Davidson to neutral from buy. Valuation call, based on a 12-month price target of $45, DA Davidson said.

Gartner (IT) was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: IT Ratings Report.

Marathon Petroleum (MPC) was upgraded at Oppenheimer to outperform from perform. Twelve-month price target is $120. Industry fundamentals should remain favorable, Oppenheimer said.

Magna (MGA) upgraded at Deutsche Bank to buy from hold. Twelve-month price target is $75. Company can exceed consensus growth expectations and deserves a higher multiple, Deutsche Bank said.

PNM Resources (PNM) was upgraded at Jefferies to buy from hold. Twelve-month price target is $30.50. After visiting New Mexico, analysts are upgrading PNM and anticipate the NMPRC will approve the BART agreement in the June/July time frame. Jefferies says the economic consequences of shutting down a coal plant in a struggling economy will outweigh environmental concerns and expect PNM will be able to deliver on its 7% to 9% EPS growth. With the stock off 15% since January, Jefferies says investors can get PNM at a 10% discount.

Tsakos Energy Navigation (TNP) was upgraded to buy at TheStreet Ratings. You can view the full analysis from the report here: TNP Ratings Report.

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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