I bet you could make a decent return building a stock robot that just bought / sold all of these every year based on whether they appear on the list.
Joking aside, a lot of the supplier listed her don't seem to be the main branch, but the exact branch supplying Apple. So the company stock should really not be that tied to a specific vendor.
In particular considering that if something were to happen to Apple, any other hardware manufacturer could take the opportunity to contract them, making it neutral.
It's alphabetical, so no help there.