The Werewolf supplement Book of the Wyrm describes the Pentex Corporation and other Wyrm-tainted stuff. Pages 37-39 list 21 fictional corporations owned by Pentex.
A couple of these were instantly recognizable to me as parodies or references to real-world business. For example, "Endron International", a petrochemical company infamous for large oil spills, is a parody of the Enron Corporation (which has a branch called Enron International). Enron was a global energy company with diverse business interests which was accused of ignoring pipeline leaks.
Which of these 21 corporations are parodies or references to real-world businesses?