RATINGS CHANGES

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

Mettler-Toledo (MTD) - Get Report was upgraded to buy from neutral at Bank of America/Merrill Lynch. $470 price target. Organic growth is accelerating, given improvement in niche end-markets, analysts said. 

Pure Storage (PSTG) - Get Report was upgraded to outperform from perform at Oppenheimer. The valuation is more attractive, based on a $15 price target, Oppenheimer said. 

Phillips 66 (PSX) - Get Report was upgraded to buy at TheStreet Ratings. You can view the full analysis from the report here: PSX.

This article was written by a staff member of TheStreet.