A stock purchase agreement is the contract document which governs the acquisition of a corporation through a stock purchase. My template stock purchase agreement can be used whenever an individual or corporation wants to engage in the sale or purchase of existing shares in a company.Contact LOKK Legal for advice on Stock Purchase And Sale Agreements. Whether you are a business buyer or seller, contact San Diego Corporate Law for a consultation to discuss your business sale options. The formal agreement which documents the sale of stock to the founders of a California corporation. A stock purchase agreement is a legal contract that governs the sale and purchase of shares in a company, specifying the transaction's terms and conditions. Learn how to properly complete and use the RPA to better serve and protect yourself and YOUR CLIENTS.