Top US Analyst Ratings: CCL, PANW, TEVA, Z

Amec Foster Wheeler PLC (AMFW) was raised to Buy from Neutral at Merrill Lynch.

Carnival Corp. (CCL) was downgraded to Underweight from Equal Weight and the price target was cut to $48 from $54 at Morgan Stanley.

Ciena (CIEN) was downgraded to equal-weight at Morgan Stanley with a $23 price target.

Ciena Corp. (CIEN) was downgraded to Hold from Buy at Drexel Hamilton.

Ciena Corp. (CIEN) was reiterated as Buy with a target price of $30 at Argus.

Cornerstone OnDemand Inc. (CSOD) was started as Overweight with a $53 price target at Piper Jaffray.

Ctrip.com International Ltd. (CTRP) was started with an Outperform rating and given a $58 price target at Credit Suisse.

First Cash Financial Services Inc. (FCFS) was started as Hold with a $60 price target at Jefferies.

Genesco (GCO) was downgraded to neutral from outperform at Robert Baird with a $53 price target.

MercadoLibre Inc. (MELI) was raised to Overweight from Neutral with a $200 price target at JPMorgan.

Novo Nordisk A/S (NVO) was downgraded to Equal Weight from Overweight at Morgan Stanley.

Physicians Realty Trust (DOC) was downgraded to Market Perform from Outperform at Raymond James.

Pioneer Energy Services Corp. (PES) was raised to Buy from Hold with a $6 price target at Jefferies.

Palo Alto Networks (PANW) was upgraded to hold at TheStreet.

Spark Therapeutics Inc. (ONCE) was started with a Buy rating and was given a $73 price target at Stifel.

Smith & Wesson (SWHC) was downgraded to hold from buy at Craig Hallum with a $33 price target.

Teva Pharmaceutical Industries Ltd. (TEVA) was raised to Outperform from Perform with a $66 price target at Oppenheimer.

Verifone Systems Inc. (PAY) was downgraded to Neutral from Outperform and the price target was cut to $20 from $30 at Wedbush Securities.

Verifone Systems Inc. (PAY) reiterated a Buy rating but cut its target to $18 from $26 at Stifel.

Zillow (Z) was initiated with a hold rating at TheStreet.