Market Overview

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Palo Alto Networks Inc (NYSE: PANW) shares are up 6 percent after delivering a first quarter earnings and sales beat.

The U.S. District Court of Kansas lifted a stay in the longstanding legal battle between Digital Ally, Inc (NASDAQ: DGLY) and Axon Enterprise, Inc (NASDAQ: AAXN) on Friday, Nov. 17. 

On CNBC's "Fast Money Halftime Report," Jon Najarian said that he noticed unusual options activity in The Coca-Cola Co (NYSE: KO).

Gainers:

Celsion Corporation (NASDAQ: CLSN) shares are 18 percent higher after Oppenheimer analyst Hartaj Singh initiated coverage on the company with an Outperform rating and $9 price target.

If oil prices stabilize in 2018, investors may find themselves eyeing refinery companies. This potential move has HollyFrontier Corp (NYSE: HFC) on Argus Research's radar. 

Analog and mixed-signal semiconductor maker Semtech Corporation (NASDAQ: SMTC), with its multiple-end-market target and strong growth profile, has managed to secure a Buy rating from BWS Financial.

Urban Outfitters, Inc. (NASDAQ: URBN) shares are soaring up over 8 percent after reporting record third quarter sales.

Viacom, Inc. (NASDAQ: VIAB)'s multiple may not compress any further according to Deutsche Bank. This prompted the firm to revisit its rating on the company's shares Monday.

National Vision Holdings Inc (NASDAQ: EYE), an optic retailer company that offers products and services for eye care needs, began trading as a public company in October.