MMC Benefits Handbook
Transfers from Non-Participating Marsh & McLennan Companies
If you transfer from a company that does not participate in the Plan (for example, a company based in another country) to one that does, you are eligible to join the Plan during the next Annual Enrollment period for the following Plan year, provided you otherwise meet the Plan's eligibility requirements. If you enroll in the Plan during this Annual Enrollment period and have at least one year of service with an affiliated employer, you will be eligible to receive Company matching credits during the following Plan year.