RATINGS CHANGES

Advanced Energy (AEIS - Get Report) was downgraded to neutral from buy at Bank of America/Merrill Lynch. The valuation is less attractive, based on a $35 price target, analysts said. 

TD Ameritrade (AMTD - Get Report) was downgraded to equal weight at Barclays. $33 price target. The company may face growth challenges in the second half of the year, Barclays said. 

Astronics (ATRO - Get Report) was downgraded to sector weight from overweight at Keybanc. The valuation is less attractive with shares up 56% since February, Keybanc said. 

Boeing (BA - Get Report) was downgraded to underperform from neutral at Bank of America/Merrill Lynch. $125 price target. 787 will likely not generate as much cash as expected, analysts said. 

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

DeVry Education (DV) was downgraded to underperform from neutral at Bank of America/Merrill Lynch. $18 price target. The FTC suit continues to weigh on the stock, analysts said. 

Brinker (EAT - Get Report) was downgraded to equal weight at Barclays. $47 price target. Fundamentals remains challenged and disappointing, Barclays said. 

Hershey (HSY - Get Report) was downgraded to underperform from buy at Bank of America/Merrill Lynch. $92 price target. The valuation is less attractive, as the company lacks near-term catalysts, analysts said. 

Kansas City Southern (KSU - Get Report) was upgraded to buy from underperform at Bank of America/Merrill Lynch. $106 price target. The company has cut costs and is the only operator that is growing volume, analysts said. 

Liberty Media (LSXMA - Get Report) (LSXMB - Get Report) was downgraded to hold at TheStreet Ratings. You can view the full analysis from the reports here: LSXMA and LSXMB. Conversely, Liberty Media (LSXMK - Get Report) was downgraded to sell at TheStreet Ratings. You can view the full analysis from the report here: LSXMK.

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

Northern Trust (NTRS - Get Report) was downgraded to sell at Citigroup. $66 price target. The valuation is less attractive, with shares up 20% since earnings, Citi said. 

Regeneron (REGN - Get Report) was downgraded to market perform from outperform at Wells Fargo. The company is facing Medicare Part B reimbursement concerns, Wells said. 

Spirit Airlines (SAVE - Get Report) was downgraded to neutral from overweight at JPMorgan. $52 price target. The valuation is less attractive, with shares up 33% year-to-date, JPMorgan said. 

Spirit AeroSystems (SPR - Get Report) was downgraded to neutral from buy at Bank of America/Merrill Lynch. The valuation is less attractive, based on a $50 price target, analysts said. 

St. Jude Medical (STJ) was downgraded to neutral at BTIG. The valuation is less attractive as the company lacks near-term catalysts, BTIG said. 

Tetra Tech (TTEK - Get Report) was downgraded to neutral from outperform at Wedbush. The valuation is less attractive, based on a $31 price target, Wedbush said.

This article was written by a staff member of TheStreet.