Abstract: Systems, apparatus, articles of manufacture, and methods to reduce stress between sockets and associated integrated circuit packages having glass cores are disclosed. An example integrated circuit package includes: a semiconductor die, and a substrate including a glass core. The substrate includes a first surface, a second surface opposite the first surface, and a third surface between the first surface and the second surfaces. The first surface supports the semiconductor die. The second surface includes first contacts to electrical couple with second contacts in a socket. At least a portion of the third surface separated and distinct from the glass core.