Furnish the information requested in Section 17 below; b. "Prime Contractor" or "Prime Vendor" or "Prime Supplier" means a vendor or contractor awarded a contract or purchase order directly from Bexar County.A stock purchase agreement is used when someone buys shares of a company. The transfer of shares from one shareholder must be appropriately documented. The first step is to complete a Share Purchase Agreement. In today's video I'm going to go over actually how to fill out a purchase and sale agreement. Step 1 – Fill Out the Buyer and Seller Information. 1. Seller. Write down the seller's full name.