401(k) to 403(b)

[R. Butler]

We have 2 plan sponsors who are terminating their 401(k) plans in favor of 403(b) plans. Both plans sponsors are inquiring about simply transferring the assets from the 401(k) to the 403(b) without giving the participants an opportunity to receive a distribution. I don't see that it is permissable, but wanted to double check.

Thanks in advance for any guidance.