Share Purchase Agreement: Complete Founder’s Guide 2026

You have found an investor and your term sheet is signed. And then your lawyer drops a 40-page document in your inbox called a Share Purchase Agreement but you don’t have any idea about it. 

If that sounds familiar, you are not alone. The Share Purchase Agreement, or SPA, is one of the most critical legal documents in a startup's life and yet most founders sign it without fully understanding its meaning for them including their cap table or future fundraising rounds.

This guide explains what a Share Purchase Agreement is, when startups need one, how it differs from related agreements, and the key clauses every founder should understand before signing.

What Is a Share Purchase Agreement?

A Share Purchase Agreement (SPA) is a legal contract between a buyer and a seller for the transfer of shares in a company. In simple terms, it is the document that makes a share deal official.

Share Purchase Agreement governs following transaction: 

• When an investor buys shares in your startup
• When you are acquiring another company
• When a co-founder sells their stake to a third party 

It defines the price, the number of shares being transferred, the conditions that must be met before the deal closes, and what happens if something goes wrong after closing.

Think of the SPA as the rulebook for a share transaction. It protects the buyer against     undisclosed risks, and it protects the seller against future claims — if it is drafted well.  

In India, Share Purchase Agreements are primarily governed by:

• The Indian Contract Act, 1872
• The Companies Act, 2013
• SEBI regulations for listed companies

For transactions involving foreign investors or cross-border share transfers, FEMA (Foreign Exchange Management Act) compliance may also apply.

SPA vs SSA vs SHA: Understanding the Difference

Startup founders often confuse a Share Purchase Agreement with other investment documents. While these agreements may appear similar, they serve different purposes in a transaction.

1. Share Purchase Agreement (SPA): An SPA is used when existing shares are transferred from one shareholder to another. The company itself is not issuing new shares. Instead, ownership simply moves between parties.

SPAs are commonly used in:

• Secondary share sales
• Acquisitions
• Founder or investor exits

2. Share Subscription Agreement (SSA): A Share Subscription Agreement is used when a company issues new shares to an investor in exchange for capital. This increases the company’s share capital and expands the cap table. SSAs are commonly used in startup funding rounds.

3. Shareholders Agreement (SHA): A Shareholders Agreement governs the ongoing relationship between shareholders after shares are issued or transferred.

It typically includes provisions relating to:

• Voting rights
• Board composition
• Investor protections
• Exit rights
• Governance structure

In many startup transactions, SSA, SPA, and SHA may be executed together, particularly in acquisitions or structured funding deals.

Quick rule: 

SSA = New shares being issued.    

SPA = Existing shares changing hands. 

SHA = How everyone behaves after the deal.

When Does a Startup Need a Share Purchase Agreement?

Not every startup transaction requires a Share Purchase Agreement. However, several situations commonly involve one.

1. Secondary Share Sales: Early investors or founders sometimes sell a portion of their shares to new investors. These secondary transactions provide liquidity without the company issuing new equity.

In such cases, an SPA governs the transfer of shares and payment terms.

2. Startup Acquisitions and M&A: When one company acquires another by purchasing its shares, the SPA becomes the central document of the transaction.

Through the SPA, the buyer gains ownership of the company along with its:

• Assets
• Liabilities
• Contracts
• Intellectual property

3. Founder Buyouts: If a co-founder leaves the company and sells their stake to remaining founders or investors, a Share Purchase Agreement formalizes the transfer.

Without a clear agreement, disputes can arise around valuation, payment timelines, and ownership records.

4. ESOP Buybacks or Share Transfers: When employees exercise stock options and their shares are later bought back by the company or an investor, a simplified SPA or share transfer agreement may govern the transaction depending on the deal structure.

Key Element & Clauses of Share Purchase Agreement (Format)

An SPA (Share Purchase Agreement) can run anywhere from 20 to 80 pages depending on deal complexity. But at its core, every SPA has a standard architecture. Here is the detailed format of share purchase agreement including elements and clauses every founder must know:

1. Parties and Recitals: One of the most important sections of share purchase agreement is Parties & Recitals; it identifies the buyer, seller, and the company whose shares are being transferred. It sounds basic but getting the entity names, address exactly right (matching MCA records) matters for enforceability and stamp duty calculation.
2. Definition: This section usually contains the key terminology used in legal and financial transactions. It helps in understanding the terms like “share”, “purchase agreement”, “Business day”, “Working days”, etc. 
3. Number of shares being sold: This section includes the exact number of shares and their class that are being sold along with the company’s name whose shares are being sold. 
4. Purchase Price and Payment Terms: This includes the total amount that the buyer will pay (agreed consideration) for the shares including the per-share price, total consideration, and how payment will be made (cash, stock swap, etc). In India, the price must also comply with RBI pricing guidelines for transactions involving foreign buyers or sellers.
5. Representations and Warranties: This is the section founders underestimate the most and the one that can come back to haunt you years after a deal closes.
   
   Representations and warranties are statements made by the seller about the company's current state including its financial health, legal compliance, IP ownership, pending litigation, tax position, and more. If any of these turn out to be false or inaccurate after the deal closes, the buyer can claim damages.
   
   As a founder-seller, be meticulous about what you warrant. Never warrant something you cannot verify. If there is uncertainty, disclose it in the disclosure schedule (which carves out known issues from warranty liability).
6. Restrictive Covenants: Non-compete and non-solicitation obligations that apply to the seller post-closing. In India, post-termination non-competes must be reasonable in scope, geography, and duration (typically 1 to 3 years) to be enforceable under Section 27 of the Indian Contract Act. Overly broad non-competes are routinely struck down by Indian courts.
7. Conditions Precedent (CPs): These are the conditions that must be satisfied before the deal closes. Common CPs include regulatory approvals, board resolutions, third-party consents, and clean due diligence reports. As a seller, you want as few CPs as possible, each one is a potential deal-breaker.
8. Indemnities: The indemnity clause defines what the seller must compensate the buyer for if a warranty turns out to be incorrect. Indemnities are typically capped (at the deal value or a percentage of it) and time-limited (usually 18–36 months post-closing). Always negotiate the cap, basket (minimum threshold before claims can be made), and survival period.
9. Closing Conditions and Completion Mechanics: Specifies the exact date, location, and actions required at closing — share certificate delivery, board meeting resolutions, filings with MCA, consideration payment, and so on. A poorly drafted closing mechanics clause is one of the most common causes of deal delays.
10. Governing Law and Dispute Resolution: Indian SPAs typically specify Indian law as governing law and arbitration as the dispute resolution mechanism — often under SEBI or SIAC rules for cross-border transactions. Make sure the seat of arbitration is specified clearly. Singapore is a popular neutral seat for deals with foreign investors.
11. Miscellaneous Clauses: These are the standard legal clauses that cover remaining aspects including the process of notice distribution, if the agreement can be assigned to another party, whether any terms can be waived, etc. These clauses are complex and crucial at the same time. It is important to follow these clauses throughout the contract lifecycle.  

Share Purchase Agreement Drafting Procedure 

Step 01: Initial Negotiation and Letter of Intent: The process begins with a discussion between the buyer and seller about the transaction. A Letter of Intent (LOI) or Term Sheet is prepared to outline the key commercial terms such as valuation, deal structure, and major conditions. This helps in ensuring that both parties are aligned before proceeding further.

Step 02: Due Diligence: In this stage, the buyer conducts a detailed review of the target company’s financial, legal, tax, and operational records. The objective is to verify the seller’s claims and identify potential risks or liabilities. The findings of Due Diligence Process often influence the final terms and protections included in the SPA. 

Step 03: Drafting the SPA: Once due diligence begins or key terms are finalized, the initial draft of the SPA is prepared, typically by the buyer’s legal counsel. The draft incorporates the agreed commercial terms and includes clauses covering representations, warranties, indemnities, and obligations of both parties.

Step 04: Negotiating the Terms: After the first draft is shared, both parties review the agreement and negotiate specific clauses. This discussion usually focuses on purchase price adjustments, indemnity limits, representations and warranties, and closing conditions. Multiple revisions may take place before reaching final consensus.

Step 05: Signing & Closing the Agreement: Once all terms are agreed upon, the SPA is finalized and signed by authorized representatives of both parties. At this point, the agreement becomes legally binding. However, the actual transfer of shares may still depend on certain conditions being fulfilled.

Step 06: Post Closing Matters: Even after closing, there might be ongoing obligations, such as purchase price adjustments based on closing accounts, or addressing any indemnification claims that arise.

Benefits of Share Purchase Agreements

1. Offers Clarity: Share Purchase Agreements contain all the legal terms and conditions offering clarity among buyers and sellers. 
2. Legal Protection: Share Purchase Agreements offer legal protection to both sellers and buyers. It protects the buyers from unknown liabilities while sellers are protected by clear payment terms.
3. Risk Allocation: The SPA clearly allocates transaction-related risks between the buyer and seller through provisions such as indemnification clauses. 
4. Facilitates Due Diligence: Negotiating representations and warranties typically encourages thorough due diligence, helping the buyer make a more informed decision.

Common Mistakes Founders Make in SPAs

Many founders sign Share Purchase Agreements without fully understanding their implications. Some common mistakes include:

1. Providing overly broad warranties: Founders sometimes make promises they cannot verify. All warranties should be carefully reviewed and supported by proper disclosures.
2. Ignoring indemnity caps: Without negotiated limits, indemnity liability can potentially equal the entire deal value.
3. Incomplete regulatory filings: Missing FEMA filings or share issuance records can delay or even derail transactions.
4. Inaccurate cap tables: Discrepancies between internal records and MCA filings often cause delays during due diligence.
5. Using outdated templates: Legal and tax regulations change over time, so templates should always be reviewed against current laws.

SPA Checklist Before Signing

Before executing a Share Purchase Agreement, founders should confirm the following:

• All parties correctly identified
• Purchase price and payment terms clearly defined
• Conditions precedent achievable within timeline
• Warranties reviewed and supported by disclosures
• Indemnity caps and survival periods negotiated
• Non-compete clauses reasonable in scope
• Closing procedures clearly defined
• Stamp duty calculation : Calculate Here
• Tax implications considered
• Cap table reconciled with MCA records

Taking time to review these elements can prevent costly legal disputes later.

How Startup Movers Supports Founders

Navigating a Share Purchase Agreement can be challenging for founders who are dealing with complex legal documents for the first time. Startup Movers supports founders through the entire process, including:

• Drafting and reviewing Share Purchase Agreements
• Preparing companies for Due Diligence
• Ensuring FEMA and regulatory compliance
• Structuring transactions from a tax perspective
• Reconciling Cap Tables and corporate records

With proper legal guidance, founders can approach transactions with confidence and avoid unnecessary risks.

Conclusion

Every share in a startup represents years of effort, risk, and dedication. When those shares change hands, whether through an investor exit, acquisition, or founder transition, the Share Purchase Agreement becomes the document that determines how smoothly the transaction unfolds.

Founders should treat the SPA not as a formality but as a critical safeguard for their business interests. Understanding its structure, negotiating key clauses carefully, and seeking professional advice when needed can make a significant difference in the outcome of a transaction.

A well-drafted Share Purchase Agreement protects both parties, minimizes disputes, and ensures that the transfer of ownership happens clearly, fairly, and legally.