Quickest Way To Look Up Holders of Debt In Public Companies

[wescobrk]

What is the quickest way to look up who owns debt in public companies? Also, the entire capital structure?

This will be something that will be more important as we see more filings over the next 18 months until a vaccine is found for companies that we might want to own some equity in for the possibility it isn't wiped out similar to GGP in 2009.

Thanks.