Microsoft and the Business Software Alliance, and have removed their corporate monikers from the list of supporters for the increasingly unpopular Stop Online Piracy Act. None of the three companies have commented on why they reversed their position on the controversial bill, but we imagine its because endorsing it makes the internet pretty angry with you. When asked, EA corporate told Joystiq this afternoon, "EA never expressed a position for or against SOPA." Sony and Nintendo had yet to respond as of publishing.
Note that not all of Sony's miscellaneous branches have rescinded their support, as Sony/ATV Music Publishing, Sony Music Entertainment and Sony Music Nashville still appear on the list. Also, the Entertainment Software Association is still shown as a supporter -- an organization which the aforementioned publishers (among others) belong to. Whether the group will remain on an endorsement list which exactly zero of its members appear on remains to be seen.