This short-form stock purchase agreement is used for an all cash acquisition under Illinois law. Other than the Excluded Assets, Seller shall sell, transfer, convey, assign and deliver to Buyer, and.Assumption and Bill of Sale in the form attached hereto as Exhibit A. An asset purchase agreement is a written legal instrument that formalizes the purchase of a business or significant business asset. I uploaded a simple asset purchase agreement to Docracy and thought I'd share it here. I drafted it with very small businesses in mind.