RATINGS CHANGES

Acxiom (ACXM) was upgraded to outperform at BMO Capital. $28 price target. Earnings estimates were also increased, given a better growth outlook and higher stock buybacks, BMO said. 

Akorn (AKRX - Get Report) was downgraded to hold from buy at Deutsche Bank. $33 price target. The company is facing increased competition, Deutsche said. 

Apache (APA - Get Report) was downgraded to equal-weight at Barclays. $49 price target. The valuation is less attractive, with shares up 45% from the stock's recent low, Barclays said. 

Armstrong World Industries (AWI - Get Report) was upgraded to overweight by Keybanc. $50 price target. The company is seeing higher demand in North America, Keybanc said. 

Etsy (ETSY - Get Report) was upgraded to hold at TheStreet Ratings. You can view the full analysis from the report here: ETSY.

FireEye (FEYE - Get Report) was downgraded to neutral from overweight at JPMorgan. $15 price target. The company is facing a challenging outlook in the security business, JPMorgan said. 

Fitbit (FIT - Get Report) was initiated with a sell rating at TheStreet Ratings. You can view the full analysis from the report here: FIT.

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

Huntington Ingalls (HII - Get Report) was downgraded to market perform at Wells Fargo. The valuation is less attractive, as the company is growing slower than its peers, Wells said. 

Houghton Mifflin (HMHC - Get Report) was downgraded to market perform from outperform at BMO Capital. $17 price target. The company cut guidance and lacks near-term catalysts, BMO said. 

Kraft Heinz (KHC - Get Report) was upgraded to buy from hold at Deutsche Bank. $103 price target. The company is a market leaders and aggressively cutting costs, Deutsche said. 

Ligand (LGND - Get Report) was downgraded to sell from hold at Deutsche Bank. The valuation is less attractive, based on a $110 price target, Deutsche said. 

Newfield (NFX) was downgraded to equal-weight from overweight at Barclays. The valuation is less attractive, based on a $44 price target. 

Neenah (NP - Get Report) was downgraded to neutral from buy at DA Davidson. The valuation is less attractive, based on a $78 price target, Davidson said. 

Teva Pharmaceuticals (TEVA - Get Report) was downgraded to perform from outperform at Oppenheimer. The company is facing a "toss-up" over the pending decision of Copaxone patents, Oppenheimer said. 

TripAdvisor (TRIP - Get Report) was downgraded to hold from buy at Deutsche Bank. $63 price target. The company is facing monetization and traffic problems, Deutsche said. 

U.S. Steel (X - Get Report) was upgraded to hold from underperform at Jefferies. The company is cutting costs and long-term contracts could be repriced higher in the coming quarters, Jefferies said. 

This article was written by a staff member of TheStreet.