I believe that IBM makes the chips for their Z Series mainframes. I mean, that's low volume production, but they need small feature size.
IBM Z series mainframe Telum CPUs are designed by IBM but manufactured by Samsung. IBM no longer owns any fabs. I assume they have some kind of technology licensing deal.
https://www.ibm.com/products/z/telum
IBM Z series mainframe Telum CPUs are designed by IBM but manufactured by Samsung. IBM no longer owns any fabs. I assume they have some kind of technology licensing deal.
https://www.ibm.com/products/z/telum