Pension funds are carefully regulated and cannot be in risky investments. IBM cannot invest in IBM, they have to invest in various bonds. Before pension regulations a few pensions invested in the.company and employees discovered that was a bad idea when the company went bankrupt just before they were set to retire and their pension value went to zero.
I'm not sure if this is legally a pension, if not assume it is worth nothing. If it is the US government backs it and so if you work for IBM for 30 it is a great deal, pensions are defined income so you don't have to worry about if you will live to 66 or 120. (If like most you switch jobs it is terrible)