Crosspurchase agreements are agreements where business owners purchase a departing owner's interest in the business. Identify the parties involved in the transaction. 2.This guide will help you understand how to fill out and sign a business purchase agreement template so that everyone's best interests are protected. A purchase and sale agreement should list the names of the seller(s), buyer(s), including any partners who hold an interest in the business. Of course, the primary purpose of the purchase agreement is to establish the terms of the purchase. Notably, this includes the purchase price.