The buyer will want you to keep some equity in the game. How much is negotiable and depends on how crucial you are to the business and what you want to do—age, goals, conditions for you.

A minimum will be 5%, but expect 10% to 15%. You can contract for the ability to sell in 3 to 5 years, usually in timing with your employment agreement.

Best to negotiate from a position of strength. One more agreement amongst a lot of documents.