How companies buy, sell, and combine, and what lawyers actually do on a deal.
Mergers and acquisitions is an umbrella term for transactions where ownership of a business changes hands. A merger combines two entities into one, while an acquisition sees a buyer purchase a target outright. Deals may also take the form of disposals (selling a division), management buyouts (MBOs), or joint ventures. Private M&A — where neither party is publicly listed — accounts for the vast majority of deal volume and is where most junior lawyers cut their teeth. Public M&A, governed by the Takeover Code, attracts the headlines but follows a distinct, more rigid procedural framework.
A typical private acquisition moves through several stages. It begins with origination — a client deciding to buy or sell — followed by preliminary negotiations and the signing of a non-disclosure agreement (NDA). The buyer then conducts due diligence: a forensic review of the target's contracts, litigation exposure, regulatory position, and finances. Once the parties agree on commercial terms, lawyers draft the core transaction documents, negotiate protections, and progress towards signing. If the deal has conditions — such as regulatory clearances — there will be a gap before completion, when legal title and funds actually transfer.
The centrepiece of any acquisition is the share purchase agreement (SPA) or, for asset deals, an asset purchase agreement. The SPA sets out the price, payment mechanics (often completion accounts or a locked box structure), and the warranties and indemnities that allocate risk between buyer and seller. The disclosure letter qualifies the warranties by setting out known issues — if the seller fails to disclose a material fact, the buyer may have a warranty claim. Ancillary documents include tax covenants, transitional services agreements, and any restrictive covenants preventing the seller from competing post-completion.
Lawyers on an M&A deal are not bystanders drafting paperwork — they shape deal structure and risk allocation from day one. Buyer-side counsel runs due diligence, negotiates warranty and indemnity protections, and advises on conditions precedent. Seller-side counsel prepares the disclosure letter, pushes back on overly broad warranties, and manages the data room. In practice, junior associates spend significant time on DD workstreams — reviewing hundreds of contracts, flagging change-of-control provisions, and summarising findings for the partner. Understanding the commercial context behind each clause is what separates a strong trainee from a competent one.
When a listed company is the target, the Takeover Code — enforced by the Takeover Panel — imposes strict procedural and timing rules. A bidder must announce a firm intention to make an offer once a certain threshold is crossed, and the board of the target must obtain independent advice on whether the offer is fair. Hostile bids, where the target's board opposes the acquisition, generate the most dramatic M&A stories — think defence tactics, rival bidders, and regulatory intervention. The Competition and Markets Authority (CMA) and, for larger deals, the European Commission may also need to clear the transaction before it can complete.
Private equity firms now account for a significant share of global M&A activity, using leveraged buyout structures to acquire and restructure businesses. National security reviews have become a major consideration: the UK's National Security and Investment Act 2021 gives the government power to scrutinise and block deals in sensitive sectors. ESG considerations increasingly feature in due diligence, and warranty and indemnity insurance (W&I insurance) has become standard in European deal-making, shifting risk from the seller to an insurer. Cross-border deals face additional complexity from diverging sanctions regimes and foreign direct investment screening.
M&A is the flagship practice area at most commercial law firms and the one interviewers most expect you to understand. Being able to articulate the deal lifecycle, explain the difference between warranties and indemnities, and discuss a recent transaction you have followed demonstrates exactly the kind of commercial fluency firms look for at vacation scheme and training contract interviews.
“Tell me about an M&A deal you have been following recently.”
What they're assessing
Commercial awareness, genuine engagement with the market, and the ability to analyse a transaction beyond the headline — including who the parties are, why the deal happened, and what the legal issues are.
Answer skeleton
Name the deal and the parties, then explain the commercial rationale — why did the buyer want this target? Identify the key legal elements: was it a share or asset deal, was there regulatory scrutiny, how was it financed? Then give your own view — is the valuation credible, what could go wrong, what does it tell you about the sector? Close by connecting it to a practice area at this firm.
“What is the difference between a warranty and an indemnity in an acquisition?”
What they're assessing
Technical M&A knowledge — can you explain a core concept accurately and show you understand why it matters commercially?
Answer skeleton
A warranty is a contractual statement of fact about the target — if it turns out to be untrue, the buyer can claim damages for the loss suffered, but must prove both breach and loss. An indemnity is a pound-for-pound reimbursement for a specific identified risk — no need to prove loss, which makes it a stronger protection. In practice, sellers push for warranties (harder for buyers to claim on), buyers push for indemnities on specific risks surfaced in due diligence. The disclosure letter qualifies warranties by setting out known exceptions.
“What is due diligence and why is it important in an acquisition?”
What they're assessing
Understanding of the deal process and a trainee's practical role — not just a definition, but why it matters and what lawyers actually do.
Answer skeleton
Due diligence is the buyer's investigation of the target before committing to the deal — covering legal, financial, tax, and commercial matters. Its purpose is to surface risks that affect the price, the structure, or whether to proceed at all. Legally, it informs the warranty and indemnity negotiations: a risk you discover becomes something you seek an indemnity for or price into the deal. For a trainee, DD is often the entry point into deal work — reviewing contracts, flagging change-of-control provisions, identifying litigation risks, and summarising findings for the partner.
“How does the National Security and Investment Act 2021 change the way UK M&A lawyers approach deal planning?”
What they're assessing
Awareness of how regulatory risk has grown beyond competition law — can the candidate connect a specific statute to deal structuring and advise on practical consequences?
Answer skeleton
Context: The NSI Act 2021 introduced mandatory notification for acquisitions in 17 sensitive sectors (including AI, defence, energy, and telecoms) and gave the government power to block or condition deals on national security grounds. Commercial implication: buyers must now factor government approval into deal timelines and MAC clause negotiations, since a blocked deal is a real — not theoretical — risk. Legal angle: lawyers must assess whether a target's activities trigger a notifiable acquisition, advise on the notification process, and draft conditions precedent to cover NSI clearance alongside CMA approval. Current hook/your view: the government's 2023 block of a Chinese-backed acquisition of the Newport Wafer Fab demonstrates the Act is actively used — I think lawyers should treat NSI screening as a standard deal checklist item alongside competition analysis.
“What is warranty and indemnity insurance and how has it changed the negotiating dynamics of M&A transactions?”
What they're assessing
Technical depth beyond textbook knowledge — understanding of a market-standard product that has materially changed how deals are done in practice.
Answer skeleton
Context: Warranty and indemnity (W&I) insurance allows an insurer to stand behind a seller's warranties, so a buyer's claim is made against the policy rather than the seller directly. Commercial implication: sellers can achieve a clean exit (receiving full proceeds without retaining holdback or escrow) while buyers still have warranty protection — aligning commercial interests that were previously in tension. Legal angle: lawyers must draft warranties with the insurer's requirements in mind, navigate the disclosure process carefully (known issues are typically excluded from cover), and structure the SPA to interact correctly with the policy. Current hook/your view: W&I is now standard in mid-market European deals — I think it has genuinely improved deal-making by removing the tension between seller cleanness and buyer protection, though underwriting quality varies and buyers should not treat the policy as a substitute for rigorous due diligence.
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