The Sell-Side Process: 9 Steps From Mandate to Signing

A sell-side process is the structured sale of a private company, run by an advisor who acts only for the seller. It moves through nine steps, from a signed mandate to a signed purchase agreement: two bidding rounds, then an exclusivity period that runs from the letter of intent to signing.

In sell-side M&A advisory, the advisor is mandated by the seller, and buyers bring their own advisors.

The advisor's job is to hold several buyers to one timetable and control what each of them sees, and when.

What are the steps of the sell-side process, in order?

From the seller's side, the M&A process steps fall into five phases. Steps 2 to 5 all belong to preparation and run at the same time. How long each phase takes depends on how quickly the seller's numbers are ready and how long buyers spend on diligence.

Two clocks are set by documents rather than by the work: the exclusivity period a letter of intent grants, and a regulator's review period where a merger filing or a foreign investment review applies, which can put weeks between signing and closing.

Which auction process fits your company?

The format is chosen at mandate, before the first buyer is called, because it decides who learns the company is for sale. Every M&A auction process trades price tension against confidentiality and management time, and an owner who picks the format after outreach has already made the trade by default.

5 columns. Drag the table sideways; the first column stays put.

An unsolicited approach pushes owners towards a negotiated sale, though it's the moment to bring a field to one timetable.

A dual track runs a sale and a capital raise in parallel, so the shareholders can take whichever of the two prices better. One of spectup's current mandates, a European healthcare services business, runs this way, with details withheld until it completes.

For most owner-managed companies the targeted auction is the right default: enough bidders to hold a price, few enough that staff and customers don't hear about it from a competitor.

Step 1: Mandate and scoping

The engagement letter that opens a sell-side process sets the fee, exclusivity, scope and the tail: the period after the engagement ends in which a sale to a buyer the advisor introduced still earns the fee. On a spectup mandate, what is being sold, the range it goes to market at, the floor the seller walks from and what spectup is paid are agreed before any work starts.

Before outreach, the seller decides five things:

• Floor price: the number below which the seller walks away

• Structure: a full sale, a majority sale with rollover equity, or a minority stake

• Management's role after closing, and who stays on contract

• Excluded parties: the competitors, customers or suppliers who must never hear of the sale

• Timetable: the date by which the seller needs to have signed

A seller that hasn't decided whether it'll accept rollover can't compare a sponsor's bid with a strategic acquirer's. The five answers become the yardstick every later bid is measured against.

Step 2: Preparation and sell-side due diligence

Preparation removes what a buyer's diligence would otherwise find and price. The core document is a quality of earnings (QoE) report, an accountant's test of whether the reported EBITDA is repeatable earnings.

In Europe the wider version is vendor due diligence: financial, tax and sometimes legal reports commissioned by the seller and shared with every bidder.

The preparation work itself:

• Normalised EBITDA, with every adjustment documented and defensible line by line

• Contracts reviewed for change-of-control clauses, expired terms and undocumented customer arrangements

• Ownership of intellectual property confirmed and related-party arrangements resolved

• Monthly management accounts that close on time, because buyers ask for them until the day of signing

Vendor due diligence costs money before a single offer exists. Carry it whenever more than one buyer is likely to reach round two, because one set of findings read by every bidder gives no single bidder a private reason to cut its price.

Step 3: Valuation and equity story

The valuation range draws on three methods: trading multiples of listed peers, multiples paid in precedent transactions, and a discounted cash flow of the plan. In the lower mid-market, precedent transactions carry the most weight, because listed peers are larger and trade on different terms.

spectup's range comes off transactions in the seller's sector and size that closed, adjusted for what a buyer prices differently: customer concentration, how much revenue is contracted, and how much of the company runs without the owners in it.

The equity story is the argument for the price: why the business grew, why it'll keep growing, and why one type of buyer gains more from owning it than the seller does. Every claim in it needs a number in the financials behind it.

The range is a market position; the floor from Step 1 is the walk-away. spectup fixes the floor with the seller while no offer exists, so the first offer can't.

Step 4: Marketing materials and data room

Three documents go to market: a one-page anonymous teaser, the confidential information memorandum (CIM) released after a non-disclosure agreement (NDA), and a financial model buyers use to build their own valuation. The virtual data room is built now, so it's complete before round two starts.

Disclosure in a sell-side process follows a ladder of three rungs, and the order is what protects the price:

2 columns. Drag the table sideways; the first column stays put.

The third rung waits for a written offer because those are the facts a buyer retrades on. Released before an offer, they anchor the first number low; released after it, they're measured against a price the buyer has already put in writing.

Step 5: Buyer list

The long list covers strategic acquirers, private equity funds, PE-backed platforms looking for an add-on acquisition, and family offices. Each name is ranked on strategic fit, acquisition history and capacity to pay.

The seller signs the list off and strikes names before anyone picks up a phone, because an approach that goes badly can't be taken back. Competitors are the hardest call: they're often the buyers who can pay most, and also the parties that gain most from what they'd learn.

Include a competitor only if it could plausibly be the top bidder, and only behind an NDA with a no-hire and no-contact clause.

Step 6: Outreach, NDAs and CIM release

The teaser goes out, NDAs are negotiated and the memorandum is released to each party that signs. An NDA in a sell-side M&A process usually covers confidentiality, a ban on soliciting employees, and no contact with staff, customers or suppliers.

Every party is approached inside a short window, so all of them work to one deadline, and the single deadline matters more than the length of the list. On a spectup mandate every party is approached with no names first, and named only against a signed NDA.

Step 7: First-round bids

The process letter sets the date and the content of an indication of interest (IOI): a value range on a cash-free, debt-free basis, the proposed structure, sources of financing, diligence needs, required approvals and the timetable. An IOI isn't binding, and every bidder knows it.

Every party bids to the same date. The advisor compares the IOIs on price, certainty of funds, structure and timing, and shortlists the bidders who go into round two.

A high IOI with weak financing may not survive the second round. A lower range backed by committed equity is often worth more on the shortlist than a headline that depends on debt nobody has offered yet.

Step 8: Second round, management presentations and final bids

Shortlisted buyers get access to the virtual data room, a management presentation and, where it helps, site visits. Near the end the advisor circulates a draft purchase agreement and asks for final bids on a marked-up copy, so offers are compared on one document.

Final bids differ in more than price: the price mechanism, the warranty package, the conditions to closing and how much is paid in cash at closing. A higher headline with a large earn-out, price paid later only if the business hits targets after closing, can be worth less than a lower all-cash offer.

Earn-outs are becoming more common in Europe. The CMS European M&A Study 2026, based on 601 transactions CMS advised on in 2025, found that earn-outs and EBIT/EBITDA-based earn-out metrics increased, so more of the headline is deferred and carries the risk of a plan the seller no longer runs.

Step 9: Exclusivity, confirmatory due diligence and signing

The seller picks a preferred buyer and signs a letter of intent (LOI) setting the price, structure, key terms and an exclusivity period. In a US private deal, exclusivity commonly runs 30 to 60 days after the LOI is signed, per Baker McKenzie's US private M&A guide.

In UK practice it's often four to six weeks, per Taylor Wessing's exit guide.

Push for the short end: every week of exclusivity is a week the buyer negotiates with no underbidder left in the room.

During exclusivity the buyer runs confirmatory due diligence (financial, tax, legal, commercial, sometimes IT and environmental) while the purchase agreement is negotiated. The terms that decide what the seller keeps:

• Price mechanism. A locked box mechanism fixes the price on a historical balance sheet with no adjustment after closing, protected by a no-leakage covenant until closing; completion accounts true the price up or down to the balance sheet at closing.

• Warranties and indemnities, with their caps and survival periods.

• Warranty and indemnity insurance (W&I, called representations and warranties insurance in the US), which moves part of the seller's liability to an insurer.

• Escrows or holdbacks that secure the seller's obligations after closing.

Each of these terms moves money after the price is agreed. Fix the price mechanism early: name a locked box or completion accounts in the letter of intent, while a second bidder can still be signed.

Signing and closing come apart whenever an approval is needed, and whether one applies depends on the deal's size, sector and jurisdiction. Where a US premerger filing applies, the Hart-Scott-Rodino waiting period ends on the thirtieth day after the filing is received, unless the agencies extend it with a second request. In 2026 that filing applies only above a deal value of USD 133.9M, per the FTC's current thresholds, so most sales in the lower mid-market never meet it; the UK review is triggered by the sector, whatever the size.

A UK deal caught by mandatory notification under the National Security and Investment Act can't complete until it is cleared: the review period of 30 working days runs from the day the government accepts the notice, and a call-in adds an assessment period.

Why does the second-highest bid set the price?

The second-best bid sets the price in a sale, and the best bid only decides who pays it. Every step of a sell-side process before the letter of intent exists to keep that second bid alive.

In the final round it runs in four moves:

1. One document, one date. Every shortlisted bidder marks up the same draft purchase agreement and bids to the same deadline (Steps 6 and 8), so the advisor can rank the offers side by side on price and terms.

2. The leader bids against the alternative. A bidder that knows a rival offer exists has to beat what the seller could sign instead. A leader with no rival only has to clear what it judges the seller will accept, and it bids no more than that; the floor from Step 1 is what lets the seller say no.

3. The *underbidder* stays signable. Its offer is a threat only while the seller could still sign it: committed financing behind it (Step 7), a marked-up agreement on the table, and a bidder still willing to sign at its number.

4. Exclusivity after the LOI ends the open competition. The strongest underbidder is kept warm until signing, as standard practice, but once exclusivity starts the seller can't negotiate with it, so the price in the LOI is the last price a rival bid sets.

On spectup's 2026 sell-side for a regional freight operator, four qualified acquirers were held to one timetable, with an underbidder live to the end. The second-highest offer is what decided the number the winner paid.

What does a sell-side process cost the seller?

The seller pays twice: in fees, and in management hours spent on the sale while the business still has to hit the numbers the memorandum forecast.

Advisor fees are usually a retainer plus a success fee on the transaction. spectup works on that structure, and its success fee is paid when the deal closes and the seller receives the funds. If the company doesn't sell, the seller has paid the retainer and no transaction fee, and keeps what the process produced, including the equity story, the numbers pack, the acquirer list and written feedback from every party that looked.

Two clauses in the engagement letter deserve a slow read. The tail decides whether a buyer introduced during the mandate still triggers the fee after it ends, and the definition of transaction value decides whether earn-out and escrow payments count when they're paid later. The write-up on the Lehman formula shows how a tiered success fee is calculated.

Management's hours go to four places:

• Data room requests and the follow-up questions each one generates

• A management presentation to every shortlisted buyer

• Diligence calls with the buyer's advisors during exclusivity

• Disclosure schedules and the purchase agreement, line by line with counsel

A missed month costs more during a sale, because buyers track monthly actuals against the memorandum's forecast and a business that misses its own forecast mid-process hands the buyer a reason to reprice. Keep the internal deal team small, for confidentiality and so the people running the business keep running it.

The documents a seller signs along the way

Each document binds the seller to a different degree, and the early ones (the engagement letter, the NDAs, the LOI) set terms the purchase agreement inherits.

4 columns. Drag the table sideways; the first column stays put.

Disclosure schedules take longer than sellers expect, because anything left out can become a warranty claim after closing.

How spectup runs a sell-side mandate

spectup is mandated by the seller and paid by the seller, and it brings the acquirers to the table. It sells companies with an enterprise value of EUR 10M and above, most often in healthcare, logistics and IT services, to strategics and to funds.

A mandate runs in six steps that map onto the nine above: scope and mandate (Step 1), the equity story (Steps 2 to 4), the acquirer list signed off before anyone is contacted (Step 5), approaches with no names first (Step 6), offers on one deadline (Steps 7 and 8), and diligence to signing alongside the seller's own legal counsel (Step 9).

Acquirers come from three layers of network: 440+ direct relationships from closed transactions, 2,500+ investors and LPs met on client mandates, and the buyer books of 30+ partner firms.

Buy-side mandates, where spectup acts for the acquirer instead, and the wider practice sit under M&A advisory.

What to settle before you appoint a sell-side advisor

An advisor can run every step above, but the five decisions in Step 1 (floor, structure, management, exclusions, timetable) are yours, and a process started without them gets decided by the first offer instead.

Then two checks on the business itself: monthly accounts that close on time, and adjusted EBITDA you can defend line by line.

Settle those, then interview advisors on two questions: how they'll keep the strongest underbidder warm until signing, and how they keep the market from learning the company is for sale. If either answer is vague, keep interviewing.

A 30-minute call with spectup on fit covers the band your company would go to market at, the acquirers who would be on the list and what the process costs, and you get the band before you sign anything.