RATINGS CHANGES

Astoria Financial (AF) was upgraded to overweight at Piper Jaffray. $19.50 price target. The valuation is more attractive, following the recent merger termination, Piper said. 

Cardinal Health (CAH - Get Report) was downgraded to market perform at Leerink Partners. $75 price target. Earnings estimates were also reduced, as the company is facing multiple growth headwinds, Leerink said. 

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

Alphabet (GOOGL - Get Report) was initiated with a buy rating at Aegis Capital. $980 price target. The company has multiple growth tailwinds and is buying back stock, Aegis said. 

Monster Beverage (MNST - Get Report) was upgraded to buy at Jefferies. $58 price target. The company is attractively valued and sales growth is accelerating, Jefferies said. 

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

Westinghouse Air Brake Technologies (WAB - Get Report) was upgraded to outperform from market perform at William Blair. $95 price target. The company should benefit from tax reform and deserves a higher multiple, William Blair said. 

This article was written by a staff member of TheStreet.