From the back of the book:
The Centers of Power
There is nothing in the Sixth World more powerful than the megacorporations. Even great dragons scratch and claw to get a piece of the power wielded by the Big Ten. If you’re running the shadows, you need to know about the megas, because they deal out the biggest paydays—and, if you cross them, the harshest paybacks.
Corporate Guide helps runners learn what the ten AAA-rated corporations are up to in 2072 and answers pressing questions such as: How is Aztechnology dealing with Amazonia these days? How is Horizon’s continuing prominence affecting its laid-back culture? How many times can Richard Villiers have one mega rise up from the ashes of another?
Corporate Guide offers details on all of the Big Ten megacorporations and briefings on some of the rising powers of the corp world. It also provides the basics every shadowrunner should know about how corporations work and what life is like for the drones trapped inside them, along with rules for greater interaction of player characters with these monoliths of power.