The answer is, that while it feels like your series 63 license is indeed transferable, in actuality it is not. If you want to change firms, your series 63 registration / license along with all of your other registrations must be terminated by your employer. With a series 63 license you are most likely working at a firm that is registered as a FINRA broker dealer. Since you are registered at a FINRA member firm, Your former employer / the firm that you are leaving will fill out and submit a Form U5 to FINRA. This will terminate your employment and your registration with that firm. When you arrive at your new firm you must fill out and submit a new Form U4. This will begin your registration with your new firm and your series 63 license, along with your other registrations, will become active at your new firm upon receiving notice from FINRA and the states where you conduct business. Technically when you want to change employers, the old firm, the new firm and the agent all most notify the state securities administrator. The filing of the U5 and U4 forms accomplish this task. Your license will only become effective once you have received notification from each state where you plan to conduct business, that you license has become effective.