Do not assume vesting is an L-1A employee requirement. Have the actual employment, role and company relationship reviewed to identify which dates matter to the proposed transfer.
Use immigration requirements rather than compensation milestones
If an ownership change is relevant to the qualifying structure, assess its actual effect separately. Otherwise, a compensation milestone should not be treated as an automatic eligibility event. Hypothetical example: a soil remediation contractor's regional manager is told the transfer should wait eighteen months for a cliff-vesting date.
Ask what that date changes. If it changes nothing about the role, the qualifying foreign employment or the company relationship, it is a compensation event and the timetable should be built from immigration facts instead. The dates that usually matter are the start and end of the qualifying employment abroad, any interruption within it, the readiness of the entity records, and the employer's own operational need.
Where a corporate transaction is genuinely pending, such as a sale, a merger or the insertion of a holding company, that can matter to the qualifying relationship and may be worth waiting to see resolved or documenting as of a fixed date. Set the sequence in writing and revisit it if either the role or the ownership of either entity changes before filing. Waiting also has a cost, since the qualifying year abroad must fall within the relevant preceding three-year period.