A shareholders' agreement also covers details about dividend payments and the distribution of earnings. Regarding the business operation, it contains provisions about the frequency of board meetings and the appointment or resignation of directors.
The biggest difference is that an SPA is the sale of all shares, and an APA is the sale of selected assets. Therefore, they are both different transactions and have different procedures.
When you buy common stocks, you're actually buying a small part of the company that issued it. As an owner, you could be entitled to certain benefits, like voting rights and shares of the company's profits. And if the company does well, and the value of the stock goes up, you'll be able to sell your stock for a profit.
A SPA is a legally binding contract that sets out the terms and conditions of a sale between a buyer and a seller. It is typically used in the context of buying and selling a business or a significant asset, such as shares in a company.