@MT Trendmicro To answer your question based on the tag assigned i.e Azure translator the independent resource of Azure translator cannot be transferred to another subscription you can however transfer the entire subscription to company B though as mentioned in one of the answer.
Some of the cognitive services which create projects allow users to transfer the project which is essentially all data to a different target resource but in the case of translator since most of the functionality is direct API calls you can actually create a new resource in the new subscription and call the API with the new endpoint. If custom translator project is something you want to transfer then you will have to download and re-upload data on new resource or delegate access from custom translator portal.