Is it possible to change your Grand Company at max rank?

[Japanimation]

Yes, it's possible. In fact, your first change is free of charge. I'm planning to change to all of them simply for achievement values and to get all the minions.

Thanks for the fast and clear response. I accidentally chose Serpent when choosing, and I thought I was talking to Maelstrom at the time of choosing (skipping dialogue.) I would eventually like to unlock everything from all of them though.