Typically anything with a “W” at the end of the ticker symbol is indicative of warrants of that company. A warrant is simply the price you pay to purchase those shares at an exercise price that is fixed when those warrants were issued. The price of those warrants will increase once the price of the stock goes beyond the exercised price. Warrants also have an expiration date in which owners have to either sell or agree to purchase the shares at the exercise price. This is my understanding of warrants but to be sure please verify other sources as well on warrants.
News 
Market Data 
Discover 
