How long does a typical M&A process take?

A typical M&A process takes between 12 and 24 weeks from initial preparation through to closing, though complex deals can run significantly longer. The timeline depends on factors like deal size, regulatory requirements, due diligence complexity, and how well prepared both parties are before the process begins. Below, we break down the key questions that shape how long your transaction will actually take.

What are the main stages of an M&A process?

An M&A process moves through five core stages: preparation, evaluation and validation, transaction execution, closing, and post-deal integration. Each stage builds on the last, and skipping or rushing any one of them is one of the most common reasons deals fail to deliver their expected value.

Here is how those stages typically break down in practice:

• Stage 0 – Deal readiness assessment: Before any target is approached, it is worth establishing a clear baseline of financial quality and readiness. This means reviewing reporting reliability, financial processes, and whether the organization is genuinely prepared to run or absorb a transaction.
• Stage 1 – Strategy and investment thesis: Defining the rationale for the deal, the target profile, and the logic behind value creation. Without a clear thesis, even well-executed deals tend to disappoint.
• Stage 2 – Evaluation and validation: Screening and assessing potential targets for financial performance, strategic fit, and risk. This is where assumptions get tested before any commitment is made.
• Stage 3 – Transaction and execution: Running due diligence, finalizing valuation, negotiating terms, and completing the deal itself.
• Stage 4 – Integration and value realization: Ensuring that the deal actually delivers what was promised, aligning financial and operational structures, tracking performance, and establishing governance after closing.

The key question at every stage is not just whether the deal can be done, but whether it should be done. Discipline at each phase is what separates successful transactions from costly ones.

What factors make an M&A deal take longer?

Several factors consistently extend M&A timelines beyond initial expectations. The most common are poor deal readiness on either side, weak financial documentation, misaligned expectations on valuation, and the complexity of the business being acquired.

Deals slow down most often because of the following:

• Inadequate preparation: When a company has not assessed its own financial quality before entering a process, gaps surface during due diligence and create delays while issues are resolved.
• Valuation disagreements: If the buyer and seller have significantly different views on value, negotiations can stall for weeks or months before a structure is agreed.
• Incomplete or unreliable financial data: Poor reporting quality forces additional rounds of analysis and validation, extending the due diligence phase considerably.
• Multiple stakeholders with conflicting priorities: When management, shareholders, and advisors are not aligned, decision-making slows and momentum is lost.
• Unexpected findings during due diligence: Hidden liabilities, tax issues, or operational risks discovered mid-process often require renegotiation or additional investigation before the deal can proceed.

Many of these delays are avoidable with thorough preparation before the process formally begins. The more clarity both parties have upfront, the smoother the execution phase tends to be.

How long does due diligence typically take?

Due diligence typically takes between four and eight weeks for a straightforward transaction, but can extend to twelve weeks or more when the target company is complex, data is incomplete, or significant risks require deeper investigation.

The due diligence phase and financial review involves a thorough review of the target company’s financial statements, cash flow, debt structure, profitability trends, tax compliance, and legal position. The goal is not just to validate the numbers but to uncover anything that could affect the deal’s value or structure.

What drives the timeline here is primarily data quality. When a target company has well-organized, accurate financial records and management is responsive, due diligence moves quickly. When documentation is fragmented or financials are unreliable, every additional question generates another round of requests and responses.

For buyers, having an experienced financial lead embedded in the due diligence process makes a significant difference. Rather than reviewing data passively, a CFO-level perspective actively steers the analysis toward the questions that matter most for valuation and risk, keeping the process focused and efficient.

Does deal size affect how long an M&A process takes?

Yes, deal size is one of the most reliable predictors of an M&A timeline. Larger transactions involve more complexity, more stakeholders, more detailed due diligence, and often regulatory review, all of which extend the process. Smaller deals between well-prepared parties can close in as little as 12 weeks, while large or cross-border transactions routinely take six months or longer.

Larger deals tend to involve more complex organizational structures, multiple business units, international operations, and a greater number of advisors on both sides. Each of these adds coordination time and increases the likelihood of issues surfacing during due diligence.

That said, deal size alone does not determine the timeline. A mid-sized deal with poor financial documentation or a contentious valuation can take longer than a larger transaction where both parties are well prepared and aligned. Preparation and process discipline often matter more than the absolute size of the deal.

When does regulatory approval slow down a merger or acquisition?

Regulatory approval becomes a significant timeline factor when a deal involves large market shares, operates in regulated industries, or crosses national borders. In these situations, competition authorities or sector-specific regulators must review and approve the transaction before it can close, which can add months to the process.

In the Netherlands and across the EU, deals above certain revenue thresholds are subject to merger control review by the Dutch Authority for Consumers and Markets (ACM) or the European Commission. These reviews can take anywhere from a few weeks for straightforward cases to six months or more when regulators have concerns about market concentration.

Industries that tend to face the most regulatory scrutiny include financial services, healthcare, energy, and telecommunications. If your deal touches any of these sectors or involves a target with significant market share, building regulatory review time into your planning from the start is essential.

Early engagement with legal advisors who understand the applicable regulatory landscape can help you anticipate requirements and avoid surprises that stall the process at a late stage.

How can companies speed up their M&A timeline without adding risk?

The most effective way to accelerate an M&A process is to invest in preparation before the formal process begins. Companies that enter a transaction with a clear investment thesis, reliable financial data, and a defined target profile consistently move through execution faster than those that figure these things out along the way.

Practical steps that compress timelines without cutting corners include:

• Assess deal readiness early: Understanding your own financial quality and identifying gaps before approaching targets prevents delays from surfacing at the worst possible moment.
• Define your investment thesis clearly: Knowing exactly what you are looking for and why makes target screening faster and keeps decision-making focused during negotiation.
• Organize your data room in advance: For sellers, having financial documentation prepared and organized before due diligence begins dramatically reduces back-and-forth with buyers.
• Align stakeholders before the process starts: Ensuring management, shareholders, and advisors share the same understanding of goals and constraints prevents the internal disagreements that stall deals mid-process.
• Use embedded financial leadership: Having a CFO-level professional actively managing the process, rather than just advising from the side, keeps momentum high and ensures financial analysis drives decisions in real time.

Speed and rigor are not opposites in M&A. The deals that close fastest are usually the ones that were prepared most thoroughly.

How Greyt supports your M&A process

We guide companies through mergers and acquisitions from a CFO perspective, combining disciplined financial analysis with hands-on process management. Our role is not simply to facilitate a transaction, but to make sure the right deal gets done for the right reasons and that it actually delivers value after closing.

Here is what working with us looks like in practice:

• A Finance Maturity Assessment at the start to establish a clear baseline of financial quality and deal readiness before any commitment is made
• Development of a clear investment thesis and target profile, so the process stays focused and decisions are grounded in strategy
• Independent validation of assumptions during evaluation, ensuring you are not overpaying or committing to a deal that cannot deliver what it promises
• Active management of due diligence, valuation, and negotiation, with financial modelling steering decisions at every step
• Integration planning and execution after closing, translating the completed transaction into measurable performance improvements

Whether you are considering an acquisition, preparing for an exit, or exploring a carve-out, we bring the financial leadership and expert M&A services to make your M&A timeline work for you. Get in touch to discuss what your transaction could look like.

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