The M&A Process From Start to Finish: What First-Time Sellers Need to Know

If you have never sold a business before, the M&A process can feel like a foreign language. Everyone around you — bankers, lawyers, buyers — seems to know exactly what is happening. You are signing documents you have never seen, making decisions you cannot fully evaluate, and trying to run your business at the same time.

This is a plain-language walkthrough of what actually happens from the moment you decide to sell to the moment the wire hits.

Stage 1 — Preparation (3 to 6 Months Before Going to Market)

The work that happens before a buyer ever sees your business is the work that determines what you receive for it.

This stage includes getting your financials in order, organizing your legal documents, identifying and resolving issues that buyers will find in diligence, building your data room, and assembling your advisory team — typically an M&A attorney, an accountant, and depending on deal size, an investment banker or business broker.

Founders who skip this stage and go straight to market pay for it in price, timeline, and terms.

Stage 2 — Going to Market

Once you are prepared, the process of finding buyers begins. How this works depends on your approach:

• With a banker or broker. They prepare a confidential information memorandum — a detailed document describing your business — and reach out to a curated list of potential buyers on your behalf. This is the most common approach for deals above $2 to $3 million.
• Without a banker. Some founders run a more informal process, reaching out directly to known buyers or responding to inbound interest. This works in some situations but requires significantly more time and negotiation experience from the seller.

All serious buyers sign a non-disclosure agreement before receiving any confidential information about your business.

Stage 3 — Buyer Conversations and the Letter of Intent

Interested buyers submit indications of interest — preliminary, non-binding expressions of what they would pay and how they would structure the deal. You and your advisors evaluate these and decide which buyers to engage further.

From those conversations, a serious buyer will submit a Letter of Intent. The LOI outlines the proposed purchase price, deal structure, and key terms. It is largely non-binding on economics — but certain provisions, including exclusivity, are legally binding the moment you sign.

Exclusivity means you cannot talk to other buyers for a defined period, typically 30 to 90 days. This is when the buyer’s leverage increases significantly. Negotiate the LOI carefully before you sign it.

Stage 4 — Due Diligence (60 to 90 Days)

Once an LOI is signed, the buyer conducts due diligence — a systematic review of everything about your business. They will examine your financials, contracts, customer relationships, employees, IP, legal history, taxes, and operations.

This is the stage most first-time sellers underestimate. It is time-consuming, intrusive, and often stressful. Buyers ask for documents you forgot existed. Issues surface that you did not anticipate. The process takes longer than anyone expects.

How well you prepared in Stage 1 determines how smoothly this goes.

Stage 5 — Negotiating the Purchase Agreement

While due diligence is underway, your attorney and the buyer’s attorney negotiate the definitive purchase agreement — the legally binding contract that governs the transaction. This document is far more detailed than the LOI and addresses every aspect of the deal including representations and warranties, indemnification, closing conditions, and post-closing obligations.

This is not a document to skim. Every provision has consequences. First-time sellers who do not have experienced M&A counsel at this stage regularly agree to terms they do not fully understand.

Stage 6 — Closing

Once due diligence is complete and the purchase agreement is finalized, the deal closes. Documents are executed, funds are wired, and ownership transfers. A portion of the purchase price is typically held in escrow and released over the following 12 to 18 months.

Closing is not the end. Post-closing obligations — transition services, non-compete agreements, earnout periods, indemnification exposure — begin the moment the deal closes.

What First-Time Sellers Are Most Surprised By

The process takes longer than expected. The emotional weight of it is real. Running a business while simultaneously managing a sale is genuinely hard. And the gap between the number you expect and the number you walk away with — after taxes, fees, escrow, and deal structure — is almost always larger than anticipated.

None of that should stop you from pursuing a sale. It should make you more prepared for what the process actually involves.

GNS Law guides founders through every stage of the M&A process, from pre-sale preparation to closing and beyond. If you are considering selling your business for the first time, contact us at gnslawpllc.com to understand what the process looks like for your specific situation.

About GNS Law

GNS Law is a business law firm for entrepreneurs and business owners who are building, scaling, or preparing to sell their companies. Founded by M&A attorney Gabriela N. Smith, the firm advises clients across the full lifecycle of their business — from entity formation and contract review to risk management and exit transactions. GNS Law works with founders and operators across industries, domestically and internationally, delivering practical legal guidance that moves with the pace of business.

This article is for informational purposes only and does not constitute legal advice. For guidance specific to your situation, contact GNS Law.