It's very difficult. Normally, you should have employee representatives in your company. These representatives should represent the interest of the employees. There are also employer representatives that represent the interest of the company. So, the employee representatives could make a case about the bad returns of the second pillar and try to move. However, this can only be done for all employees inside the plan, so it's not a small move and unless there is a really good reason to do that, it's unlikely that your employer would follow.