Our company transferred the alphanumeric designation issued by the USPTO to another party. Can the new owner reactivate?

Yes, an alphanumeric designation can be transferred or assigned, and reactivated upon application by the assignee. An application must include a copy of the pertinent portion of the document assigning rights in the alphanumeric designation to the new owner. The application must be filed within six months of the date of assignment. 15 C.F.R. §280.323(e)