Employee and Employer Contributions
In most 401(k) plans, the participant contributes a portion of their paycheck, and the employer may match all or part of it. In a divorce QDRO, both types of contributions can be divided—subject to vesting.
The court can order a percentage (commonly 50%) of the marital portion of the account to be paid to the alternate payee. That includes all vested employee contributions and any vested employer match. If some of the employer contributions are not vested as of the divorce date, they may not be included in the marital division unless otherwise agreed by both parties.

