All Company Contributions and related earnings with respect to Plan Years 2018 and earlier of each Participant shall be fully vested effective May 1, 2019 regardless of the Participant’s age or time in service. Effective January 1, 2019, Company Contributions and related earnings for Plan Years 2019 and thereafter will be fully vested in this Supplemental DC Plan only upon completion of five full years of service as a Participant in this Supplemental DC Plan (including any service as a Participant under the Cash Balance SERP) and the Participant’s attainment of age 55. Notwithstanding the above, if a Participant incurs a "disability'', as that term is defined under Code Section 409A and any relevant regulations, then such Participant shall vest in the entire Account Balance as of the disability date. The Account Balance will vest in full upon the death of a Participant or the mandatory retirement of a Participant under Section II.2.