you know, i wouldn't mind arasaka if it didn't mean i might get killed off so someone else can move up the corpo ladder; thus i have settled for fontaine futuristics because i'm a huge bioshock nerd anyway

Let’s see, Fontaine Futuristics, a company founded by a man who believes in a Utopia and tests it’s products on it’s employees or Vault-Tec, a company who believes in the betterment of society through its morally ambiguous experiments. Before everyone gets up-in-arms over these companies remember 2 of the most evilest Army units that ever existed conducted experiments that put the World decades ahead in science and technology and some of the perpetrators were given immunity from being charged with War Crimes. All in the name of humanity and the findings of their horrific experiments. Yeah, this is a tough one. Building a Better Tomorrow Today.

Probably Ryujin. They are not as evil as Vault-Tec or Arasaka, and I don't know the other companies.

The umbrella corp. from Resi Evil.

Trevor Philips Industries

Doofenshmirtz Evil Incorporated

H&H

BlasTech

Poseidon Energy