Left wing... media? What's that?

I'm trying to list all of the well-known news organizations that have a large reach, aren't owned by a large corporation, and have large private endowment or some other form of complete financial security not reliant on the government or any of those large corporations.

I'm sure they're probably some in the world. Maybe. But I can't really think of any in the US.

Can anyone help me out here?