Pfizer Inc (PFE)

Ever wonder who comes up with all these new drugs all the time? Well, they don't "come up" with them, they research and develop them - and Pfizer is the biggest of those companies (commonly known as Big Pharma). New York-based Pfizer is behind Lipitor (for high cholesterol), Chantix (to quit smoking), and Zoloft (to help with depression).