Share Purchase Agreement in Hong Kong: A Complete Legal Guide

A share purchase agreement (SPA) is the principal legal document governing the sale and purchase of shares in a company. In Hong Kong, it sets out the binding terms between seller and buyer: what is being sold, at what price, on what conditions, and what each party’s obligations are before, on, and after the completion date.

Unlike an asset purchase agreement (APA), where the buyer acquires specific assets and liabilities, an SPA transfers ownership of shares. The buyer steps into the shoes of the seller as shareholder and, through those shares, indirectly acquires all the assets and assumes all the liabilities of the target company, whether or not the buyer was aware of them at the time of signing.

This distinction is material. Choosing between a share deal and an asset deal involves weighing regulatory approvals, tax treatment, the complexity of separating liabilities, and the ease of financing. Slotine advises clients on the right deal structure before any documents are drafted.

Every share purchase agreement in Hong Kong will include a core set of commercial and legal provisions. Understanding what each clause does, and where the negotiating tension lies, is essential before any party signs.

The SPA will specify the total consideration and how it is paid. Most Hong Kong deals use one of two pricing mechanisms.

Under the completion accounts approach, the parties agree an initial price payable on closing, with post-closing adjustments to reflect the actual financial position of the target at closing. This provides a more accurate final price but creates post-closing negotiation risk.

Under the locked box approach, the price is fixed at signing by reference to a recent balance sheet. The seller undertakes not to extract value from the target between the locked box date and closing (known as preventing ‘leakage’). This provides price certainty for both sides and avoids post-closing disputes.

Earnout provisions (where part of the price is contingent on the target’s future performance) are common in start-up and growth-stage transactions. They bridge valuation gaps but require careful drafting to avoid disputes over how performance metrics are calculated.

Conditions precedent (CPs) are conditions that must be satisfied or waived before either party is obligated to complete the transaction. Common conditions in Hong Kong SPAs include:

• regulatory approvals (SFC, Insurance Authority, Competition Commission)
• third-party consents (lenders, major counterparties)
• no material adverse change in the target’s business between signing and closing
• seller warranties remaining true and accurate at closing

If a CP is not satisfied by the long-stop date agreed in the SPA, either party (or both, depending on the drafting) may have a right to terminate. A buyer’s lawyer will seek broad, seller-friendly CPs; a seller’s lawyer will push for the narrowest possible list to limit the buyer’s ability to walk away.

The seller will give extensive representations and warranties (R&Ws) about the target company: its shares, financial statements, material contracts, intellectual property, litigation, and tax position. These are the buyer’s primary protection against unknown liabilities.

R&Ws are qualified by a disclosure letter prepared by the seller’s lawyers. Items properly disclosed in the letter will reduce or extinguish the seller’s liability for a warranty breach. Buyers should scrutinise the disclosure letter carefully: it is often where the real commercial risk sits.

Where a specific known risk exists (for example, a tax liability arising before completion), the buyer will typically seek a specific indemnity rather than relying on a warranty. An indemnity provides a pound-for-pound recovery without the need to prove loss.

Limitations on liability are always negotiated: caps (typically a percentage of the purchase price), time limits (often 12-24 months for general warranties, longer for tax and fundamental warranties), and financial thresholds (de minimis and aggregate basket provisions).

Between signing and closing, the seller covenants to run the target business in its ordinary course. The buyer typically negotiates specific restrictions: no new encumbrances over assets, no material contract amendments, no new share issuances.

Post-closing covenants commonly include non-compete and non-solicitation obligations on the seller, obligations to assist with the transition, and any agreed name changes for the target company.

Non-compete clauses restrict the seller from competing with the target business for a defined period and within a defined geographic scope after closing. In Hong Kong, restrictive covenants are enforceable if they go no further than is reasonably necessary to protect the buyer’s legitimate business interests. Courts will not enforce clauses that are unreasonably wide in scope, duration, or geography.

Negotiating covenants that are commercially meaningful but legally enforceable requires judgment. Slotine advises both buyers and sellers on calibrating these provisions for the Hong Kong market.

The disclosure letter is prepared by the seller’s lawyers and qualifies the warranties given in the SPA. It is a critical document: anything properly disclosed limits the seller’s liability for a warranty claim in respect of the disclosed matter.

A well-drafted disclosure letter protects sellers. A well-reviewed disclosure letter protects buyers. Both sides should have specialist M&A counsel reviewing this document before signing.

Escrow arrangements sit alongside the payment mechanics of a Hong Kong SPA. The buyer deposits a portion of the purchase price with an escrow agent at closing (or funds the escrow post-closing per the SPA). The escrow provides the buyer with a live recovery pool against warranty claims and specific indemnities during the survival period, and gives the seller a defined and time-limited exposure.

Common escrow structures on Hong Kong deals:

• Warranty escrow. Portion of the purchase price (commonly 5% to 15%, but deal-dependent) held for 12 to 18 months matching the general commercial warranty survival period. Buyer recovers claims directly from escrow; balance released to seller on expiry.
• Tax escrow. Separate escrow tranche calibrated to identified tax exposure, with survival matched to the Cap. 112 section 60 assessment window (6 or 10 years). See the stamp duty guide for section 45 clawback considerations.
• Earn-out escrow. Where an earn-out is structured, the buyer funds the maximum earn-out amount into escrow to secure payment on achievement of the metric. See the earn-outs guide.
• Specific indemnity escrow. Ring-fenced tranche for a specific identified risk (open IRD assessment, pending litigation, licence non-compliance). Released on resolution of the underlying risk.

The escrow agent is typically a HK-licensed bank or an international bank with a HK branch. The escrow agreement is a tripartite document between buyer, seller and agent. Release triggers, claim procedures and dispute mechanisms are drafted in detail. The escrow protects the buyer without imposing the counter-party risk of chasing an under-capitalised seller post-closing.

For the interaction of escrow with warranty caps, baskets and de minimis, see the W&I guide. For escrow release scheduling in the closing timetable, see the Closing Checklist.

A share purchase agreement will typically require the execution of additional documents at or before closing. In Hong Kong, these include:

• Instrument of transfer: the statutory form required to transfer legal title to shares in a Hong Kong company.
• Sold note and bought note: required by the Companies Ordinance (Cap. 622) to evidence transfer of beneficial and legal ownership.
• Shareholders agreement: where the buyer acquires only part of the share capital, a shareholders agreement will govern the ongoing relationship between co-shareholders.
• Deed of tax indemnity: the seller indemnifies the buyer for pre-completion tax liabilities of the target.
• Guarantee agreement: a parent company guarantee for the buyer’s obligations (particularly in leveraged transactions).
• Deed of release: where the target owes money to a seller affiliate, a release is needed to clean up intercompany balances at closing.

Many SPAs handled by Hong Kong M&A lawyers involve parties or assets in multiple jurisdictions. A buyer incorporated in the US acquiring a Hong Kong target with operations in mainland China faces a different legal landscape from a domestic deal. Slotine regularly advises on cross-border transactions and is familiar with the additional layers these deals require.

Cross-border SPAs may require approvals from multiple regulators. In addition to Hong Kong regulatory clearances, deals may trigger merger filings in mainland China (SAMR), antitrust review in the EU or US, and change-of-control requirements in the target’s industry. Mapping the regulatory landscape early (before signing) is essential. A missed filing can void a deal or result in substantial penalties.

Parties to a cross-border SPA have significant freedom to choose their governing law and dispute resolution mechanism. Hong Kong law is a common choice for transactions involving Hong Kong-incorporated targets, given its commercial law framework and the enforceability of Hong Kong court judgments and arbitral awards across most major jurisdictions.

Arbitration clauses (HKIAC, ICC, or SIAC) are preferred over litigation in many cross-border deals because they offer confidentiality, neutral forum, and international enforceability under the New York Convention. Slotine advises on the most appropriate mechanism for each transaction.

In Hong Kong, the transfer of shares in a Hong Kong company attracts ad valorem stamp duty at a rate of 0.2% of the higher of the consideration paid or the market value of the shares transferred (split equally between buyer and seller at 0.1% each). This is paid within two days of the transfer document being executed.

Cross-border structures sometimes seek to minimise stamp duty by interposing holding companies in other jurisdictions. The appropriateness of such structures depends on the overall transaction design and the tax advice received.

Due diligence for a cross-border SPA will typically cover multiple jurisdictions. Legal due diligence reports in each relevant jurisdiction will inform the scope of the warranties sought and the specific indemnities required. Coordinating multi-jurisdiction due diligence requires a lead counsel with experience managing teams across legal systems.

A typical Hong Kong SPA process follows this sequence:

1. Letter of Intent (LOI) / Term Sheet: sets out agreed commercial terms, exclusivity, and confidentiality.
2. Due diligence: legal, financial, and tax review of the target. Typically 3-8 weeks depending on complexity.
3. SPA drafting and negotiation: first draft typically produced by the buyer’s lawyers. Negotiation of warranties, CPs, pricing mechanism, and restrictive covenants.
4. Disclosure letter preparation: seller’s lawyers prepare and negotiate the disclosure letter alongside the SPA.
5. Signing: both parties sign the SPA. The transaction is legally committed subject to satisfaction of CPs.
6. Interim period: CPs are satisfied (regulatory approvals obtained, third-party consents received, seller covenants observed).
7. Closing: purchase price is paid, completion documents are exchanged, title to shares transfers. Stamp duty paid within 2 days.
8. Post-closing: completion accounts prepared (if applicable), earnout tracking begins, transitional services run, non-compete period commences.

Slotine’s M&A lawyers advise buyers and sellers on all aspects of share purchase agreements in Hong Kong and cross-border transactions. Our work covers the full deal lifecycle: deal structuring, due diligence, SPA drafting and negotiation, regulatory filings, completion, and post-closing disputes.

We act for founders selling businesses, private equity investors acquiring portfolio companies, and international buyers acquiring Hong Kong-incorporated targets. Our cross-border experience includes transactions involving parties in mainland China, Singapore, the United Kingdom, France, and other jurisdictions.

This article does not, and is not intended to, constitute legal advice, and should not be relied upon as such. Slotine can assist with queries on share purchase agreements in Hong Kong. Please contact us if you wish to learn more.