Key Takeaways

A Stock Purchase Agreement (SPA) is a contract detailing all aspects of the transfer of company stock between two parties.
An SPA is a legal document designed to protect both parties in the transaction from disputes or damages.
It is important to ensure that any SPA is agreed to and understood by both parties and that it is legally compliant.
An SPA should not be confused with an Asset Purchase Agreement (APA), which is a contract for the sale of company property rather than ownership rights.

Buying shares or stock in a company? Learn how to protect your interests with a robust stock purchase agreement. We set out the key clauses and requirements of such an agreement below.

Note: This article provides general information and does not constitute legal advice. For legal advice specific to your situation you should engage a qualified solicitor or attorney in the applicable jurisdiction.

What is a Stock Purchase Agreement?

In its simple terms, a Stock Purchase Agreement (SPA), sometimes also referred to as a Share Purchase Agreement, is a two-party contract managing the sale of company stock.

Stock purchases are often used by small to medium enterprises as a way of raising funds. They also play a role in dividing ownership and voting rights or both common and preferred shares. An SPA is a document that spells out the terms of a sale to create a legally binding agreement between the parties (See Ironclad App Journal).

Like many business documents, there is no legally mandated standard format for an SPA. However, several key elements and terms should be considered for inclusion when drafting (See Thomson Reuters).

We list these below.

1. Parties to the Agreement

Any SPA should detail exactly who the parties involved in the transaction are. If these are individuals, their full legal name should be listed. If one or both parties are corporations, the full legal name of the signing officers should be listed alongside the corporation’s legal and operating names. Who is the buyer and who is the seller, along with the objective of the transaction should also be included in these details.

2. Definitions of the Terms

To be legally compliant, any terms used within the SPA should be clearly defined to avoid ambiguity.

3. Price and Payment Details

One of the most fundamental sections of an SPA details the amount agreed to be paid and the amount of stock it will purchase. This information should be clearly presented, possibly including a formula to show how the valuation has been reached. Other aspects, such as deposits, payment schedules, and any provision for escrow, should also be included.

4. Representations and Warranties

Both parties should include statements in the SPA that clarify their positions and right to play their part in the transaction. For the seller, this could include their rights over the stock and the amount of stock they currently own. It might also detail the structure, directors, and market reputation of the company. For the buyer, this section should demonstrate their right to buy, if they are an individual or a corporation, and how subsequent SPAs might be entered into.

5. Indemnification Clause

This is often required in SPAs as a method of risk management, particularly by the buyer. It is a negotiated clause seeking to protect one or both parties from potential damages, reputational or financial, arising from the sale. For instance, should the company whose stock has been sold later become involved in controversy or legal issues, the indemnity clause may require the buyer of stock to be compensated or publicly defended by the seller. This is often one of the most hotly contested clauses.

Why Does a Stock Purchase Agreement Matter?

Like any contract, an SPA is essential for making sure all parties to a transaction are fully protected and that all elements of the sale are agreed upon, understood, and detailed for clarification in the event of future disputes.

An SPA serves as a tool to record exactly what has taken place, what role each party has played, and what promises or assurances have been made. If issues later occur and mediation or legal action is required, it then acts as evidence to ensure a fair resolution is reached based on established facts rather than potentially conflicting testimonies.

Key Challenges in Stock Purchase Agreements

As with any business transaction, not every stock purchase will go as smoothly as planned. Many of the most common disputes after the completion of stock purchases are related to information that is not properly disclosed at the time of sale. These include past liabilities of the business for which stocks have been sold, ownership of and issues arising from security interests, or existing agreements between the company and its employees or others which may affect the value of the stock or the obligations later placed on stockholders.

The best way to ensure these challenges are resolved is to plan ahead and allow all eventualities to be properly discussed and included in the SPA before completing the sale. For added protection and assurances, companies should always consider hiring the services of an expert service to administer and draft the SPA and/or for it to be checked by specialist lawyers for both parties.

Best Practices for Drafting a Stock Purchase Agreement

Anyone can take simple steps to ensure their SPA is as effective as possible. One of the best is to research case studies and previous examples.

Many millions of SPAs have been created and used successfully to cover almost every possible set of circumstances and requirements. Learning from what has gone before and properly researching the challenges and resolutions others have faced is one of the most effective ways to avoid similar situations reoccurring.

Ultimately, however, while using guides like this alongside case studies and examples is always helpful, there is no substitute for working with experienced experts to ensure SPAs are complete and compliant in every way.

Stock Purchase Agreement (SPA) vs Asset Purchase Agreement (APA)

An Asset Purchase Agreement (APA) is a contract between two parties for the sale of a specific company asset, or assets, such as property. A Stock Purchase Agreement (SPA) covers the transfer of stocks and shares in the business. As this is related to a sale of ownership, it can be a more complicated transaction that requires a series of important clarifications and protections for all parties involved.

Dimension	Stock/Share Purchase (SPA)	Asset Purchase (APA)
What is acquired	Entire company — shares (ownership interest), including all assets, liabilities, contracts, goodwill.	Only specified assets and liabilities chosen by buyer.
Liability transfer	Buyer assumes all liabilities (known & unknown) of company.	Buyer can avoid unwanted liabilities by excluding them; seller keeps non-transferred liabilities.
Complexity of transfer	Generally simpler for seller; continuity of contracts, licenses, workforce retained.	More complex — individual assets/contracts must be assigned or transferred, may require consents.
Due diligence importance	High — buyer must check all company history, liabilities, contracts, compliance.	Also important — buyer needs to review each asset, lien, contract, and specify exclusions carefully.
Typical Use Cases	M&A where buyer wants full control and continuity (all assets, staff, contracts intact)	When buyer wants selected assets or wants to avoid legacy liabilities — asset stripping, selective acquisitions

Stock purchase agreements must address regulatory approval requirements, earn-out provisions tied to post-closing performance, and representations around compliance history and hidden liabilities that are particularly critical in acquisitions. China corporate services advisors at MSA Asia structure acquisition agreements that protect buyer interests. Contact us to draft your acquisition documentation.