Employee and Employer Contributions
Typically, both the employee (the participant) and the employer (Unknown sponsor) contribute to the plan. In most cases, all contributions made during the marriage are considered marital property and are subject to division. However, only vested employer contributions can be assigned in a QDRO.
Important note: If the plan has a vesting schedule, the alternate payee (usually the ex-spouse) is only entitled to the vested portion as of the date of division. Unvested contributions made by the employer will likely be forfeited, not transferred.

