The sell-side M&A process is the structured sequence of steps an owner and their advisers follow to sell a company. Its purpose is to create competition among qualified buyers while protecting confidentiality, and to carry the best of those buyers through diligence to a signed, closeable definitive agreement. A typical lower-middle-market private sale runs six to twelve months and is led by a sell-side investment bank or business broker acting as the seller's agent.
The defining feature of a well-run sell-side process is that it is an auction, even a quiet one: by approaching multiple buyers in parallel and holding them to a common timetable, the adviser converts the seller's single asset into a competitive market, which is the single most reliable lever on final price.
Stage 1 — Preparation
Before any buyer is contacted, the adviser and owner spend weeks to months getting the company "deal-ready":
- Financial preparation. Recasting the financials onto a normalized basis and computing Adjusted EBITDA through add-backs. Many sellers commission a sell-side quality-of-earnings (QoE) report to validate those numbers before buyers can challenge them.
- Marketing materials. Drafting the anonymous teaser and the detailed Confidential Information Memorandum.
- Buyer list. Building and tiering a target list of strategic and financial buyers (see deal sourcing).
- Housekeeping. Cleaning up corporate records, customer contracts, leases and any items that would later surface as diligence problems.
Stage 2 — Marketing and outreach
The adviser contacts the buyer list with the one- or two-page teaser, which describes the business without naming it. Interested parties sign a non-disclosure agreement and receive the CIM and a process letter setting the timetable and instructions for submitting a first-round bid.
Stage 3 — First-round bids (IOIs)
Buyers who remain interested submit a non-binding indication of interest (IOI) — a short letter giving a preliminary valuation range, structure and conditions. The adviser uses the IOIs to short-list a handful of bidders, who are then invited to management presentations and given deeper data-room access.
Stage 4 — Second-round bids (LOIs)
Short-listed buyers conduct preliminary diligence, meet management, and submit a letter of intent (LOI) — a more specific, still largely non-binding offer with a firm price, structure and key terms. The seller negotiates the leading LOIs and ultimately selects one, usually granting the winner a period of exclusivity (a "no-shop").
Stage 5 — Confirmatory diligence and the definitive agreement
During exclusivity the buyer completes confirmatory due diligence — financial (a buy-side QoE), legal, tax, commercial and operational — using the data room. In parallel, counsel negotiates the definitive agreement (asset or stock purchase), including the working-capital target, escrow/holdback, indemnities and any earnout or rollover.
Stage 6 — Signing and closing
The parties sign the definitive agreement. Closing may be simultaneous with signing or follow a gap during which conditions on the closing checklist — third-party consents, financing, and regulatory clearances such as the HSR waiting period — are satisfied. At closing, funds are wired, ownership transfers, and post-closing mechanics (escrow, working-capital true-up) begin.
Why sellers run a process
Running a competitive process rather than negotiating with a single buyer typically improves both price (competition discourages low-balling and surfaces the strategic buyer who values the asset most) and terms (a buyer who knows there are alternatives accepts cleaner terms). It also preserves the seller's leverage right up to signing — leverage that collapses the moment exclusivity is granted, which is why advisers resist granting it too early.
See also
- Buy-side M&A process — The deal cycle from the buyer's perspective: thesis development, sourcing, screening, valuation, IOI / LOI, diligence, structuring, financing and closing.
- Teaser — A one-to-two-page anonymous summary used by sell-side advisors to introduce a target to potential buyers without disclosing its identity until an NDA is signed.
- Confidential Information Memorandum — The detailed marketing document that follows the teaser. Usually 30–80+ pages covering business overview, market, financials, customers, employees and growth opportunities.
- Non-disclosure agreement — A confidentiality contract executed before a buyer receives the CIM. It binds the buyer to use the target's information only to evaluate the transaction.
- Indication of interest — A non-binding, written response from a buyer giving a preliminary valuation range, structure preferences and key conditions. Used to short-list bidders before LOIs.
- Letter of intent — A preliminary document outlining the main terms of a proposed deal, mostly non-binding.
- Exclusivity — A binding period (usually 30–90 days) within an LOI during which the seller agrees not to negotiate or accept competing offers, while the buyer completes diligence.
- Due diligence — The structured investigation a buyer conducts on a target between LOI and closing — covering financial, legal, tax, commercial, operational, IT, HR and environmental workstreams — to verify the seller’s claims, find risks and shape final price and deal terms.
- Definitive purchase agreement — The binding contract that governs an acquisition and its terms.
- M&A broker vs investment banker — Business brokers and investment bankers both run sell-side processes, but differ on deal size, fee structure, buyer reach and depth of materials. Brokers dominate sub-$10M; bankers dominate $10M+.
External resources
Practitioner guides from Main Street Wealth, the M&A advisory firm that sponsors M&Apedia (how this works):
- Sell a business — Sell-side advisory process, timelines and seller resources.
- Complete M&A Process Timeline — Stage-by-stage walkthrough of a transaction from preparation to closing.