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Do they even own a plant or is production outsourced?

Apple bought P.A. Semi, a small chip manufacturer, last year, so it is technically under the Apple umbrella.

P.A. Semi are designers, not manufacturers. I expect fabrication is outsourced to an outfit like TSMC.

Samsung would be an obvious guess at the fab, given Apple's history of working with them.

P.A. Semi is fabless, meaning manufacturing is done by someone else.