An ownership transfer or assignment is when the owner of the trademark changes due to a transfer of rights, trade, donation, merge, etc.

All transfers o assignments must be informed to the Trademarks Office so that the trademark remains registered under the correct owner.

The ownership transfer or assignment must be filed with the Trademarks Office (which may or may not have a fee depending on the country) with the corresponding documentation that proves the transfer of rights, trade, donation, merge, etc.