Exactly, it's IBM. As a company, what they do is so diversified in both level of complexity and technology type that a "core technology team" is just nonsensical.

I mean, in the same company you have on one end of the scale lots of teams doing just outsourced IT support ("my corporate word install is broken, pls fix"). And on the other end for instance the IBM Zürich research lab, who have received multiple Nobel prizes in physics and who developed things like Token ring and Trellis code modulation.