They picked up the old Maxim fab in San Jose almost 10 years ago. Not sure what's happening in there now and I assume the people who do aren't likely to spill the beans :) unless its as shuttered I guess.

[1] https://appleinsider.com/articles/15/12/14/apple-buys-former...

The San Jose facility is active. There was some controversy surrounding it recently as some members of the public have been complaining that they’ve been illegally releasing solvents into the environment, which resulted in some EPA investigation/enforcement action [1].

According to some reports they may be developing micro-LED display tech there, not necessarily chips.

[1] https://news.ycombinator.com/item?id=40772224