Legal Due Diligence Checklist for M&A: How to Protect Your Investment

Written by Nicolas Tang

  • Farallon Law Corporation
  • September 26, 2025

Mergers and acquisitions (M&A) are complex, high-stakes transactions. While the promise of synergy and growth is a powerful motivator, the process can be fraught with hidden risks that could easily unravel a deal. Or worse, lead to significant post-acquisition liabilities. This is where legal due diligence comes into the picture as a critical shield for your investment.

What is Legal Due Diligence?

Legal due diligence entails a meticulous, systematic investigation into the target company’s legal and regulatory status. It is done to confirm the seller’s representations, assess any potential legal risks or liabilities, and uncover potential deal-breakers before a deal is finalised. Skipping a comprehensive due diligence check can expose a potential buyer to inheriting lawsuits, undisclosed debts, or regulatory penalties, turning a promising opportunity into a costly liability.

So, how does legal due diligence differ from financial due diligence? While both processes are essential, they focus on different aspects of the business. Financial due diligence is a deep dive into the numbers typically conducted by a team of accountants or financial advisor. It involves analysing a company’s financial health, performance, and projections to ensure the seller’s financial statements are accurate and to assess an appropriate valuation.

In contrast, legal due diligence examines the legal integrity of the business, its assets, and its operations. This includes reviewing contracts, compliance records, litigation history, and corporate governance documents.

A thorough due diligence check requires both legal and financial teams to work in tandem. It may also involve other processes like commercial due diligence, focusing on market strategy, customer base, and competitive analysis, to provide a holistic picture of the business.

The Legal Due Diligence Process in Singapore

Carrying out legal due diligence in Singapore for an M&A is a structured and rigorous exercise. It typically follows a three-step approach:

  • Preparing a Comprehensive Due Diligence Checklist: This document is a detailed list of all documents and information required from the target company for the due diligence review. Its scope is tailored to the specific nature of the business and the transaction. This checklist is a critical tool for the legal team, ensuring no stone is left unturned.
  • Review and Analysis: The target company provides the requested information, often through a secure online virtual data room. The legal team then meticulously reviews and analyses each document. This phase can involve sifting through hundreds, if not thousands, of pages of contracts, corporate records, and litigation documents to identify potential red flags or liabilities.
  • Compiling the Due Diligence Report: After the review has concluded, the legal team compiles its findings into a formal report. This report typically highlights key risks, compliance issues, and potential deal-breakers. It may be a detailed, comprehensive document or a concise “exceptions-only” report, depending on the client’s preference and the complexity of the deal.

Read how Farallon Law provided end-to-end legal counsel for M&A of businesses in Singapore.

Legal Due Diligence Checklist: Key Areas of Review

A thorough legal due diligence checklist is the foundation of a successful M&A due diligence process. Here are the key areas that a corporate law firm would typically review:

  • Corporate Governance & Structure: Review of the company’s constitution, shareholder agreements, board minutes, dispute resolution mechanisms, and resolutions to confirm the ownership structure and ensure proper corporate governance has been followed.
  • Material Contracts & Agreements: Review of key customer and supplier contracts, loan agreements, debt instruments, and real estate leases. Lawyers will look for “change of control” or anti-assignment clauses that could be triggered by the acquisition, potentially requiring third-party consent.
  • Litigation & Disputes: Investigation into any pending or threatened lawsuits, past litigation, local and international arbitration, and governmental investigations or inquiries, to uncover any hidden liabilities that could lead to future legal action.
  • Regulatory Compliance: Verification of all necessary licenses and permits for operation in Singapore. This also involves reviewing the history of non-compliance or past penalties as well as checking for compliance with local requirements and laws like the Personal Data Protection Act or Employment Act.
  • Intellectual Property (IP): Review of all owned and licensed patents, trademarks, and copyrights to ensure that the target company has valid title to its intellectual property and is not infringing on the rights of others.
  • Employment Matters: Examination of all employment contracts, labour agreements, and employee benefits plans to identify any potential labour disputes or liabilities related to employee entitlements.
  • Assets & Real Estate: Verification of the ownership of key assets and title deeds for real estate, including a review for any encumbrances, liens, or mortgages that could affect the value of the assets.

The Importance of a Legal Due Diligence Check for a Buyer

A robust due diligence process is a critical investment for any buyer in an M&A. It provides the information needed to make an informed decision, going far beyond a simple valuation. This helps a buyer to:

  • Identify risks that could impact target company valuation: For example, discovering a pending lawsuit or a significant breach of a key contract could lower the purchase price.
  • Negotiate better terms in the Sale and Purchase Agreement (SPA): Findings can be used to negotiate lower prices or to include specific indemnities and warranties to protect the buyer from future liabilities.
  • Develop a solid post-merger integration plan: Understanding the legal and operational landscape of the target company allows for a smoother transition and integration process after the deal is closed.

A classic example of a deal that went wrong due to a failure in legal due diligence is the acquisition of the Learning Company by Mattel. Mattel failed to properly investigate the financial projections and operations of the company, ultimately leading to a loss of US$184 million due to declining sales and a massive after-tax loss of over US$400 million.

Seeking Expertise: Why You Need a Specialised Merger and Acquisition Lawyer

The complexity of legal due diligence requires specialised expertise. A standard corporate law firm may not have the depth of knowledge and experience needed to navigate the intricacies of M&A due diligence. A dedicated Merger and Acquisition lawyer provides significant value to potential buyers by:

  • Offering a deep understanding of corporate law and M&A procedures in Singapore
  • Having experience in identifying red flags and hidden liabilities that may not be apparent to a non-expert or non-specialist
  • Having the ability to structure deals to protect the client’s interests, using legal instruments like indemnities and warranties
  • Providing a streamlined and efficient due diligence process, saving the client time and resources

Ultimately, legal due diligence is not just a formality but a critical investment in the success and security of any M&A transaction. A thorough due diligence check is the foundation of a successful deal, ensuring that the buyer knows exactly what they are acquiring.

Contact Farallon Law for expert guidance on legal due diligence for M&A transactions.

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