We'll explain everything business owners should know about stock purchase agreements and share a stock purchase agreement template to make the process easier. Stock purchase agreements (SPAs) establish all of the terms related to the sale of a company's shares.Learn how to manage your agreements. This editable template will streamline your process when a seller owns stocks and wants to sell to a buyer. Edit, send, and store directly in Contractbook. Term. Defined at Page: Found in Section(s):. Acquired Companies. 9. Stock and Asset Purchase Agreement dated as of October 21, 2011 among ARROWHEAD RESEARCH CORPORATION, HOFFMANN-LA ROCHE INC. And F. HOFFMANN-LA ROCHE LTD.