17% from corporations, but also count foundations if you're looking for underwriters overall, not just corporate interests. Probably also universities and "other" for 41.6% That's still not even remotely close to a vast majority, of course. And I think there's a qualitative difference between getting funding from an organization that wants to increase its bottom line and one that wants to create a more just, verdant, and peaceful world.
I recognize the phrase and can even hear the hosts speaking it in my head... but I couldn't tell you the name of the sponsor. I'm sure it'll come to me.