The Sell-Side M&A Process: From Teaser to Closing, Step by Step

"Walk me through a sell-side M&A process" is one of the most common questions in investment banking interviews. It's also exactly what you'll spend your first year doing if you land in an M&A or coverage group.

The short answer: a company hires a bank to sell itself. The bank prepares marketing materials, contacts buyers, runs one or two rounds of bidding, negotiates the best deal, and gets it signed and closed. That usually takes several months.

Below, we'll break down every stage, what the analyst actually does at each one, and how to turn it all into a crisp interview answer.

First, What Is a Sell-Side Process?

On a sell-side mandate, the bank represents the seller. That might be a founder, a private equity firm exiting a portfolio company, or a corporation divesting a division.

The bank's job is simple to state and hard to execute: get the best outcome for the client. "Best" usually means highest price, but it also includes certainty of closing, speed, and terms like how much risk the seller keeps after the deal.

Auction vs. Negotiated Sale

Not every sale looks the same. The main formats are:

• Broad auction: the bank contacts a long list of buyers (strategics and financial sponsors). This creates maximum competition but takes more time and raises the risk of leaks.
• Targeted (limited) auction: only a handful of the most likely buyers are approached. It's faster and more confidential, with somewhat less competitive tension.
• Negotiated sale: the seller talks to one buyer. It's quick and discreet, but without competition, the seller has less leverage on price.

Most of this post follows a two-round auction, since that's the classic structure interviewers expect you to know.

Stage 1: Preparation (Before Any Buyer Hears About It)

This is where the bank does a lot of heavy lifting, and where analysts live in PowerPoint and Excel.

Getting Organized

After the bank is formally engaged (via an engagement letter setting out fees and scope), the team:

• Meets management to understand the business, its strategy, and its numbers
• Builds a financial model with projections that will support the valuation story
• Runs a preliminary valuation (comps, precedent transactions, DCF, and an LBO analysis to see what sponsors could afford)
• Builds a buyer list, typically split into strategic buyers and financial sponsors, often ranked by likely interest and ability to pay

Drafting the Marketing Materials

Two documents matter most here:

• The teaser: a short document, often one or two pages, that describes the business without naming it. It covers the industry, key highlights, and a few headline financials. Its goal is to make buyers want to learn more.
• The CIM (Confidential Information Memorandum): a much longer, detailed document covering the business model, customers, operations, management, and historical and projected financials. Buyers only get it after signing an NDA.

The team also starts preparing the virtual data room (VDR), the secure online folder where buyers will eventually review contracts, financials, and other diligence documents.

Stage 2: First Round (Marketing and Indications of Interest)

Now the process goes live.

Teasers and NDAs

The bank sends the teaser to the buyer list. Interested parties sign a non-disclosure agreement (NDA), sometimes called a confidentiality agreement.

NDAs often include more than confidentiality. Common add-ons are a non-solicit (the buyer can't poach the target's employees) and, for public targets, a standstill (the buyer can't buy shares or launch a hostile bid for a period of time).

CIM and Process Letter

Once the NDA is signed, buyers receive the CIM and a process letter. The process letter explains the rules: the bid deadline and what each first-round bid must include.

Indications of Interest (IOIs)

By the deadline, buyers submit non-binding indications of interest. A typical IOI includes:

• A valuation range (for example, $450 million to $500 million)
• Key assumptions behind the price
• Financing sources (cash on hand, debt, equity)
• Diligence needs and expected timing
• Required approvals (internal, board, regulatory)

Non-binding is the key word. Nobody is committed to anything yet, but the IOIs tell the seller who is serious and roughly where value sits.

The bank and client then pick a shorter list of bidders to advance to round two.

Stage 3: Second Round (Due Diligence and Final Bids)

This is the most intense stretch of the process for everyone involved.

Deep Due Diligence

Second-round bidders get:

• Management presentations, where the target's executives pitch the business and take questions
• Full data room access to contracts, financial detail, legal documents, and HR information
• Site visits and expert calls where relevant
• Sell-side reports the seller may have commissioned, such as a quality of earnings (QoE) report from an accounting firm

As an analyst, you'll be fielding buyer questions, coordinating with the client to upload documents, and tracking who has looked at what in the data room.

The Draft Purchase Agreement

The seller's lawyers circulate a draft purchase agreement (often a stock purchase agreement or asset purchase agreement, depending on the structure). Bidders return a markup showing the changes they want.

This is a big deal. Two bids at the same price can be very different once you read the markups: one bidder may accept the seller's terms, while another asks for broad indemnities and more conditions to closing.

Final Bids

Buyers submit final (binding) bids, usually including:

• A firm price
• The marked-up purchase agreement
• Financing commitment letters if they're using debt
• Confirmation that diligence is complete or nearly complete

A Worked Example: Comparing Final Bids

Here's a hypothetical to show why the highest headline number doesn't always win.

Bidder B looks better on paper, but only $480 million is guaranteed. The extra $40 million depends on the business hitting targets after the seller has lost control of it. Add a tougher markup, and Bidder A's $500 million might be the stronger offer.

On the other hand, Bidder A carries antitrust risk, which could delay or even block the deal. The bank lays all of this out (analysts often build a bid comparison matrix exactly like the one above) and advises the client on which bidder to move forward with.

Stage 4: Negotiation and Signing

The seller picks a preferred bidder, sometimes granting a short period of exclusivity, and both sides negotiate the final terms of the purchase agreement.

Once everything is agreed, the parties sign the definitive agreement. For public company targets, the board typically receives a fairness opinion from a financial advisor stating that the price is fair, from a financial point of view, to shareholders.

Signing is when the deal is usually announced (if it's going to be public). But signing isn't the finish line.

Stage 5: From Signing to Closing

Signing means both parties are legally committed. Closing is when money changes hands and ownership actually transfers.

Sometimes they happen on the same day (a "simultaneous sign and close"). More often, there's a gap because certain closing conditions must be satisfied first:

• Regulatory approvals, such as antitrust clearance. In the US, deals above certain size thresholds require an HSR filing, and the parties generally can't close until the waiting period (normally 30 days for most transactions) expires or is terminated early. Second requests can extend this significantly.
• Shareholder approval, if the target is public
• Third-party consents, for example when key customer contracts require approval upon a change of control
• Financing, finalized and funded

Once every condition is met, the deal closes. The buyer pays, the seller transfers ownership, and the bank collects its success fee.

How Long Does All This Take?

It varies a lot by deal size, complexity, and market conditions, but a rough feel for a standard two-round auction:

• Preparation: several weeks to a couple of months
• First round: about a month or more
• Second round: about one to two months
• Signing to closing: anywhere from same day to many months, depending on regulatory and shareholder approvals

All told, it's common for a process to take several months from kickoff to signing, and longer to close if there's a heavy regulatory review. In an interview, saying "roughly four to six months to signing, then closing timing depends on approvals" is a reasonable ballpark, as long as you frame it as approximate.

What the Analyst Actually Does

If you want to sound credible, connect each stage to real analyst work:

• Preparation: build the model, comps and valuation; draft the teaser and CIM; build the buyer list
• First round: send teasers, track NDAs, manage buyer outreach logs, summarize IOIs
• Second round: run the data room, coordinate diligence requests, prepare management presentation slides
• Final bids: build the bid comparison analysis, support the fairness opinion work if applicable
• Signing to closing: help with announcement materials and keep closing checklists moving

Mentioning one or two of these in an interview shows you understand the job, not just the theory.

How to Answer "Walk Me Through a Sell-Side Process"

Keep it structured and under a minute. Something like:

"First, the bank prepares: it meets management, builds a model and valuation, creates a buyer list, and drafts the teaser and CIM. Then it contacts buyers with the teaser. Interested parties sign an NDA and receive the CIM, and submit non-binding indications of interest. The best bidders move to a second round, where they get management presentations and full data room access, mark up the draft purchase agreement, and submit binding bids. The seller picks a winner based on price, certainty, and terms, they negotiate and sign the definitive agreement, and the deal closes once conditions like regulatory approval are satisfied."

Likely Follow-Up Questions

Be ready for these:

• "Why run an auction instead of negotiating with one buyer?" Competition tends to push price up and improve terms, at the cost of time and confidentiality.
• "What's the difference between signing and closing?" Signing commits both parties; closing transfers ownership once conditions are met.
• "Why might a seller choose a lower bid?" Higher certainty of closing, all-cash consideration, cleaner contract terms, or less regulatory risk.
• "Why do strategics sometimes pay more than sponsors?" They may be able to realize synergies, which can justify a higher price.

The Bottom Line

The sell-side process follows a clear arc: prepare, market, narrow the field, negotiate, sign, close. Each step exists to create competition while keeping the deal moving toward certainty.

Learn the sequence, understand why each document and round exists, and be ready to explain why the highest bid isn't always the best one. Do that, and this question becomes an easy win in your next interview.