RATINGS CHANGES

Akamai (AKAM - Get Report) was upgraded to buy at TheStreet Ratings. You can view the full analysis from the report here: AKAM.

Cliffs Natural Resources (CLF - Get Report) was upgraded to overweight from neutral at JPMorgan. $7 price target. Earnings estimates were also raised, given higher steel pricing, JPMorgan said. 

Twenty-First Century Fox (FOXA) was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: FOXA.

Lockheed Martin (LMT - Get Report) was downgraded to hold from buy at Berenberg. The valuation isn't as attractive, based on a $260 price target, Berenberg said. 

Marketo (MKTO) was downgraded to sector perform at RBC Capital. The valuation isn't as attractive, based on a $34 price target and as the stock is already pricing in takeover speculation, RBC said. 

Marathon Oil (MRO - Get Report) was upgraded to overweight from neutral at Piper Jaffray. $16 price target. The company has meaningful potential operating leverage, Piper said. 

Micron (MU - Get Report) was upgraded to outperform from neutral at Robert Baird. Gross margin outlook is improving, Baird said. 

Signature Bank (SBNY - Get Report) was downgraded to neutral from overweight at Piper Jaffray. $146 price target. The company has potential credit quality issues, Piper said. 

Terex (TEX - Get Report) was downgraded to equal weight at Morgan Stanley. The valuation is less attractive, based on a $21 price target and after the Zoomlion bid failed, Morgan Stanley said. 

Tetra Tech (TTEK - Get Report) was upgraded to buy from hold at Canaccord Genuity. $37 price target. Following a management meeting, the analysts have more conviction on the stock, Canaccord said.  

WisdomTree Investments  (WETF - Get Report) was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: WETF.

This article was written by a staff member of TheStreet.