It looks like they've been doing it since at least 2012: https://www.nytimes.com/2012/01/14/technology/apple-releases-list-of-its-suppliers-for-the-first-time.h

It looks like they've been doing it since at least 2012: https://www.nytimes.com/2012/01/14/technology/apple-releases-list-of-its-suppliers-for-the-first-time.html https://www.nytimes.com/2012/01/14/technology/apple-releases...