RATINGS CHANGES

Citigroup (C) - Get Report was downgraded to neutral from buy at Goldman Sachs. $50 price target. Returns and earnings have failed to live up to expectations, Goldman said. 

Cardinal Health (CAH) - Get Report was downgraded to neutral from buy at Goldman Sachs. $83 price target. The company was also cut from the Conviction list, given softer brand price inflation, Goldman said. 

Comerica (CMA) - Get Report was upgraded to buy from neutral at Goldman Sachs. $52 price target. The company was also added to the Conviction list, as it should be able to achieve its near-term targets, Goldman said. 

Dana (DAN) - Get Report was upgraded to overweight from equal-weight at Barclays. The valuation is more attractive, based on a $20 price target, Barclays said. 

Dominion Diamond (DDC) was downgraded to sell at TheStreet Ratings. You can view the full analysis from the report here: DDC.

G-III Apparel (GIII) - Get Report was downgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: GIII.

Guidewire Software (GUID) was downgraded to underperform from neutral at Bank of America/Merrill Lynch. The valuation is less attractive, based on a $60 price target, analysts said. 

McKesson (MCK) - Get Report was downgraded to neutral from buy at Goldman Sachs. $189 price target. The company is leveraged to moderating pricing, in addition to generics and currency headwinds, Goldman said. 

Novavax (NVAX) - Get Report was downgraded to neutral from outperform at  Wedbush. $2 price target. RSV vaccine no longer appears to work with the elderly, Wedbush said. 

Novavax was downgraded to neutral from overweight at Piper Jaffray. $1 price target. The company failed in Phase 3 trials, Piper said. 

Novavax was downgraded to neutral from overweight at JPMorgan. Vaccine failed to prove effective in Phase 3 trials, JPMorgan said.

PepsiCo (PEP) - Get Report was initiated with an outperform rating at Credit Suisse. $121 price target. The snacks business should drive growth in the coming quarters, Credit Suisse said. 

This article was written by a staff member of TheStreet.