Letter of Intent (LOI) in M&A: Hong Kong Guide

A poorly drafted LOI can lock a buyer into commercial terms that are difficult to renegotiate, expose a seller to a non-binding deal that ties up the company for months, or trigger unintended binding obligations under Hong Kong common law.

The Letter of Intent (LOI) is one of the most underestimated documents in mergers and acquisitions. It is often signed quickly, with the parties focused on the headline price and structure, yet it sets the framework that governs the rest of the deal: exclusivity, confidentiality, governing law, and the rules of engagement until signing of the Share Purchase Agreement.

This guide explains what a Letter of Intent does, how it relates to other preliminary documents (MOU, IOI, Term Sheet, Heads of Terms), which clauses must be drafted with particular care, and how Hong Kong courts treat binding and non-binding provisions in practice. It is intended for legal and deal professionals working on cross-border transactions involving Hong Kong, and complements our broader private equity and acquisition finance practice.

A Letter of Intent in an M&A context is a preliminary written document signed between a potential buyer and a potential seller (or target shareholders) that records the key commercial terms of a proposed transaction and the process the parties will follow before signing definitive documents.

It is typically signed after the buyer has reviewed initial information about the target (often under a non-disclosure agreement), has formed a preliminary view on valuation, and wants to lock in exclusivity for a period of confirmatory due diligence. From the seller’s perspective, the LOI is a milestone that justifies opening the data room and allocating management time to a process that may or may not close.

In Hong Kong and the UK, the terms Letter of Intent, Heads of Terms and Term Sheet are used broadly interchangeably for the same document, although Heads of Terms is more common in UK-influenced practice and Term Sheet is more common in venture capital and private equity contexts.

Buyers and sellers often use these labels loosely. The label matters less than the substance of the document, but understanding the distinctions helps to avoid mismatched expectations at the negotiating table.

A typical M&A timeline involves several preliminary instruments before the binding transaction documents are signed.

The LOI usually sits at the point where the buyer has done enough preliminary work to commit time and money to the next phase, but has not yet completed legal, financial and tax due diligence. In bilateral negotiations, the LOI is the buyer’s primary tool for securing exclusivity. In competitive auctions, an LOI may be replaced or supplemented by a process letter issued by the seller’s adviser, which sets out the rules for indicative and binding bids.

A well-drafted M&A LOI covers the commercial substance of the proposed deal and the procedural rules until signing. The exact content varies by transaction type, but the following components are common to most LOIs.

The most common mistake in LOI drafting is ambiguity about which clauses are intended to be binding. A well-drafted LOI states explicitly which provisions are binding and which are not.

Under Hong Kong common law principles inherited from English law, an LOI that is expressed as subject to contract is generally not binding on the commercial terms, even where the parties have agreed extensively on detail. Courts will look at the parties’ objective intention as reflected in the document, the language used (particularly the words subject to contract, in principle or non-binding), and the conduct of the parties.

A standalone clause that is expressly binding (such as exclusivity) can be enforced even if the rest of the document is non-binding, provided the binding clauses are sufficiently certain.

• Ambiguous binding language. A blanket statement that “this LOI is non-binding” without carving out exclusivity and confidentiality leaves those protections unenforceable.
• Missing exclusivity duration. An exclusivity clause without an end date is likely to be construed as unreasonable and unenforceable.
• No expense allocation. Without an express clause, each party bears its own costs by default, which can become a friction point if the deal collapses.
• Inconsistent terminology. Using LOI, MOU and Term Sheet interchangeably within the same document creates uncertainty about which legal framework applies.
• Detailed commercial terms without a “subject to contract” qualifier. The more detail the LOI contains, the higher the risk that a court will find an enforceable agreement, particularly if the parties have started to perform.
• No governing law clause. In a cross-border deal, the absence of an express choice of law can lead to costly conflict-of-laws disputes about the binding effect of preliminary documents.

Hong Kong is a frequent jurisdiction of choice for cross-border M&A involving Asian targets, European buyers or PRC counterparties. LOI drafting needs to account for several jurisdiction-specific features.

Choice of law and jurisdiction should be expressly drafted. Hong Kong law is favoured for its common-law foundation, neutral position between Mainland China and offshore creditors, and the enforceability of judgments under the mutual enforcement arrangements with the Mainland.

Signing formalities are generally light under Hong Kong law: an LOI may be signed by counterparts, by email exchange of signed PDFs, or by electronic signature under the Electronic Transactions Ordinance. For PRC-side signatories, the chop (company seal) should still be applied where it would be expected on the final documents.

Where the target is a regulated entity or a listed company, additional disclosure obligations may apply (HKEX inside information rules, SFC notifications), and the LOI should be drafted with these obligations in mind. For private deals, confidentiality during the LOI period is usually preserved through tight provisions on press releases and announcements.