Glossary term
Stock Purchase Agreement
A stock purchase agreement is a contract under which a buyer agrees to acquire shares of a company from one or more sellers under negotiated terms.
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What Is a Stock Purchase Agreement?
A stock purchase agreement is a contract under which a buyer agrees to acquire shares of a company from one or more sellers under negotiated terms. It is commonly used in private company acquisitions, secondary sales, founder or investor exits, and transactions where ownership changes through the sale of equity rather than the sale of individual assets.
The agreement does more than state the price. It defines what stock is being sold, who owns it, how closing works, what representations and warranties the parties make, what conditions must be satisfied, and what happens if a statement proves wrong or a covenant is breached.
Key Takeaways
- A stock purchase agreement transfers shares, not individual assets.
- The buyer usually inherits ownership of the company along with its assets, liabilities, contracts, and history.
- Core provisions include price, closing mechanics, representations, warranties, covenants, indemnities, and conditions.
- Due diligence is essential because the acquired company generally remains the same legal entity after closing.
- The agreement should be read with tax, legal, accounting, and financing consequences in mind.
How It Works
In a stock purchase, the seller transfers shares of a corporation to the buyer. If the buyer acquires all outstanding shares, the buyer controls the entire company. If the buyer acquires a minority block, the buyer receives the rights attached to those shares, which may include voting rights, economic rights, transfer restrictions, or investor protections.
The agreement typically identifies the parties, the shares, the purchase price, payment method, closing date, closing deliverables, and any adjustments. It may also require approvals, third-party consents, regulatory filings, payoff of debt, employee matters, or escrow arrangements.
What Buyers Focus On
A buyer wants to know what it is actually acquiring. That means reviewing capitalization, corporate authority, financial statements, tax filings, contracts, debt, litigation, employment obligations, intellectual property, customer concentration, licenses, and compliance. Because the company remains intact, hidden liabilities can stay inside the acquired entity after the shares change hands.
Representations and warranties help allocate that risk. The seller may represent that it owns the shares, that the shares are validly issued, that financial statements are accurate, or that no undisclosed liabilities exist beyond stated exceptions. If those statements are false, indemnification provisions may provide a remedy. The strength of that remedy depends on survival periods, baskets, caps, escrows, and carveouts.
Stock Purchase Versus Asset Purchase
Feature | Stock purchase | Asset purchase |
|---|---|---|
What changes hands | Shares of the company | Selected assets and assumed liabilities |
Legal entity | Company usually continues unchanged | Buyer may leave some liabilities behind |
Tax and accounting | Depends on structure and elections | Often involves asset basis allocation |
Consent issues | May avoid some assignment issues, but change-of-control clauses matter | Asset transfers may require more consents |
The better structure depends on the company, liabilities, tax basis, contracts, licenses, employees, and bargaining power. A stock purchase can be cleaner operationally, but it may expose the buyer to more historical risk.
Seller and Minority-Holder Issues
Sellers care about price certainty, payment timing, escrow size, indemnity caps, tax treatment, restrictive covenants, and release from guarantees. Minority shareholders care about whether they are being dragged along, whether transfer restrictions apply, and whether the transaction affects their rights under shareholder agreements.
In private companies, the capitalization table matters. Options, warrants, preferred stock, convertible notes, rights of first refusal, co-sale rights, and investor consents can all affect whether the seller can deliver the shares promised.
The Bottom Line
A stock purchase agreement is the legal and economic blueprint for buying company shares. Its practical importance is risk allocation: who gets paid, what ownership transfers, what facts are promised, and who bears the cost if the company is not what the buyer expected.