Yes, the transfer of an amount of membership certificates in the limited liability company that you are writing about from one person who has 100% of all certificates where another person received more than 50% ownership in this entity constitutes a change in control of the entity.The only exception would be is if the person receiving more than 50% gave a proxy to the person formerly having the 100% interest to make all decisions concerning this entity. From what you have written, I suggest that you consult with a business attorney before any transfer of interests is made.