RATINGS CHANGES

American International Group (AIG) - Get Report was downgraded to market perform at BMO Capital. $62 price target. New strategic goals appear out of reach, BMO said. 

Bristol-Myers Squibb (BMY) - Get Report was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: BMY.

Chipotle Mexican Grill (CMG) - Get Report was upgraded to neutral from underperform at Bank of America/Merrill Lynch. The valuation looks more attractive, based on a $475 price target, analysts said. 

F5 Networks (FFIV) - Get Report was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: FFIV.

Kennametal (KMT) - Get Report was upgraded to neutral from underperform at Bank of America/Merrill Lynch. The valuation is attractive, based on a $17 price target, analysts said. 

L-3 Communications (LLL) - Get Report was upgraded to buy from underperform at Bank of America/Merrill Lynch. The valuation is attractive, based on a $135 price target, analysts said. 

Monster Beverage (MNST) - Get Report was upgraded to outperform from market perform at Wells Fargo. Growth is accelerating and the stock has pulled back to a compelling entry point, Wells said. 

Northrop Grumman (NOC) - Get Report was upgraded to buy from neutral at Bank of America/Merrill Lynch. $210 price target. The market is discounting the company's long range strike bomber, analysts said. 

Ollie's Bargain (OLLI) - Get Report was downgraded to neutral from outperform at Credit Suisse. The valuation is less attractive, based on a $20 price target, Credit Suisse said. 

Oshkosh (OSK) - Get Report was downgraded to hold at Drexel Hamilton. The company has high cyclical exposure, Drexel said. 

PTC (PTC) - Get Report was upgraded to buy at Sterne Agee. $37 price target. Subscriptions should accelerate, Sterne said. 

QLogic (QLGC) was upgraded to buy at TheStreet Ratings. You can view the full analysis from the report here: QLGC

Vertex Pharmaceuticals  (VRTX) - Get Report was upgraded to buy from hold at Jefferies. The valuation is more attractive, based on a $120 price target, Jefferies said. 

This article was written by a staff member of TheStreet.