According to this article written by Our American Initiative, and published on Jack News, the web page of the Commission on Presidential Debates no longer lists the sponsors of the debates. That is, the web page doesn’t list any corporations that contributed the money for the 2016 general election debates, even though that same web page had done so in past presidential election years.
Probably the corporations that sponsor the Commission are now aware that the Commission is not very popular, and the corporate sponsors don’t want the public to know of their sponsorship.