Business owners can fund their buy-sell agreement in different ways – save the money, borrow it, or buy insurance. A Share Purchase Agreement is a document a shareholder may use to transfer their ownership of company shares (also called stock) to a buyer.This article will discuss ten of the key considerations that a purchaser must take into account when acquiring the shares of a Canadian business. The key substantive clauses in a share purchase agreement are: • date of the agreement. • Parties to the transaction.