What is the primary document entered into for a share purchase agreement?

The share purchase agreement is the primary document involved in a transaction where a buyer agrees to purchase shares from a seller in exchange for a specified purchase price. This agreement outlines the terms and conditions of the share transfer, including the number of shares being sold, the purchase price, representations and warranties of both parties, and any other conditions that need to be met for the transaction to proceed. It serves as the foundational legal instrument that governs the rights and obligations of both the buyer and the seller in the context of the share transaction.

In this case, the other options represent different types of agreements or documents that do not directly pertain to the specific act of purchasing shares in a company. An asset purchase agreement typically deals with the sale of assets rather than shares, a partnership agreement focuses on the terms of a partnership business structure, and a corporate charter is a foundational document that establishes a corporation's existence but does not govern the sale of shares itself. As such, the share purchase agreement is unequivocally the correct choice when identifying the primary document involved in share transactions.