What are the most successful book publishing companies?

What are the most successful book publishing companies?

I'm looking for information on the following - Please list...

The company.

What genre of books they publish.

What they are well known for/general reputation.

The size of the company.

And finally, which would be best to do a co-op work term at? And why?(As of today I am unsure what kind of job I would apply for - either editing, marketing or public relations)

Thanks in advance!What are the most successful book publishing companies?
The 'biggest' companies are:

Simon %26amp; Schuster

Random House

Hachette

Macmillan

HarperCollins

Penguin



All of those houses publish...well, everything. It's their subsidiaries that publish specific genres--for example, Tor Books is a subsidiary of Macmillan, and they publish science fiction/fantasy.

Macmillan is known for publishing more 'literary' books, while S%26amp;S and Random House are more 'commercial.'