How a deal actually gets done
By Michael Song · Wharton MBA · ex-Greenhill · investment banking interview coach
7 min read · updated July 2, 2026
A deal is not a moment. It's a process that runs for months, in stages, and each stage lands a different kind of work on the analyst's desk. If you picture a deal as one big signing ceremony with champagne, you've already misunderstood the job you're interviewing for.
Here's the honest shape of it. A bank spends most of its energy trying to win the work, then a compressed, brutal stretch actually doing the work, then a slow grind to close it. Most of what you see in the movies is the last five minutes of a nine-month movie.
The lifecycle, stage by stage
Let's walk a sell-side M&A process, a bank hired to sell a company, because it's the cleanest way to see the whole arc. Buy-side and capital-markets deals rearrange the pieces, but the rhythm is the same.
| Stage | What's happening | Who's leading | Analyst load |
|---|---|---|---|
| 1. Pitch | Bank tries to win the mandate against rivals | MD / VP | Heavy, bursty |
| 2. Mandate | Client signs the engagement letter | MD | Light |
| 3. Prep | Build the model, write the marketing docs | Analyst / Associate | Very heavy |
| 4. Marketing | Contact buyers, run first-round bids | VP / Associate | Heavy, reactive |
| 5. Diligence | Serious buyers dig in, data room opens | Associate / Analyst | Heavy, unpredictable |
| 6. Negotiation | Price and terms get hammered out | MD / VP | Moderate, spiky |
| 7. Close | Sign, get approvals, wire the money | Lawyers / VP | Light |
Notice something. The work does not build smoothly to a peak. It spikes, drops, spikes again. That lumpiness is the job, and it's why "the hours" are impossible to predict from the outside.
Stage 1: The pitch
Before there's a deal, there's a pitch. The bank builds a pitch book, a deck that says "here's what your company is worth, here's who'd buy it, and here's why you should hire us." Several banks pitch the same client. Most lose.
This is where beginners misjudge the business. Senior bankers spend the bulk of their careers on work that never becomes a deal. A pitch book is a full valuation, trading comparables, precedent transactions, a DCF, plus market color and buyer lists. The analyst builds all of it. And then, often, nothing happens.
Thinking a deal is one big event instead of months of staged, stop-start work. Beginners picture the handshake. The reality is a pitch that may die, a prep phase that consumes weeks, a marketing process that stalls and restarts, and a diligence grind where buyers ask a thousand questions. When you say in an interview that you "want to work on deals," show you know a deal is a process, not an event.
Stage 2: Mandate
The client picks a bank and signs an engagement letter. That's the mandate. Fee structure gets set here, usually a success fee that only pays if the deal closes, plus maybe a retainer. This stage is quiet for the analyst. Enjoy it. It won't last.
Stage 3: Preparation
Now the real construction starts, and the analyst load goes vertical. Two things get built in parallel:
- The model. A full operating model of the target, feeding the valuation. This is where you defend what the company is worth.
- The marketing documents. A short, anonymous teaser to gauge interest, then a detailed Confidential Information Memorandum (CIM), the sales document that tells the company's full story to buyers who sign a non-disclosure agreement.
The prep phase is where the analyst is most clearly the engine. The senior team can only sell what you've built. If the model is wrong or the CIM is thin, there's nothing to take to buyers. Everything downstream, every price a buyer names, traces back to numbers an analyst assembled in this stage.
Stage 4: Marketing
The bank reaches out to a buyer list, both buy-side financial sponsors and strategic acquirers. Interested parties sign NDAs, get the CIM, and submit non-binding first-round bids (indications of interest). This stage is reactive: a buyer emails a question at 6pm and wants a model tweak by morning. Your hours stop being your own.
Stage 5: Diligence
Serious bidders now get deep access through a virtual data room, every contract, financial statement, and customer detail. This is the most intense phase, and a lot of the grunt work lives right here. The analyst often runs the data room and manages the diligence Q&A tracker, the running log of every buyer question and the answer the client gives back.
It's unglamorous and it's relentless. Buyers ask questions at all hours, and the answers have to be consistent with everything in the CIM and the model. Which brings up the reason consistency matters so much once a deal is live.
Underestimating why consistency across the analysis matters when a deal goes live. A pitch book that's slightly off is embarrassing. A live-deal model that contradicts the CIM, or two versions of the same number in two documents, can blow up trust with a buyer paying hundreds of millions. Once real money is on the table, every figure you produce has to reconcile with every other figure. That discipline, holding one clean set of numbers across dozens of documents under a deadline, is a huge part of what makes the job hard.
Stage 6: Negotiation
Final bids come in. The seller and the leading buyer negotiate price and terms, and lawyers draft the definitive purchase agreement. The MD and VP run this. The analyst supports with updated analysis: what does the bid imply for enterprise value, how does a higher price change the math, what happens if the buyer wants to pay partly in stock. Spiky work, high stakes.
Stage 7: Close
Signing isn't the end. Between signing and closing come regulatory approvals, financing, and sometimes shareholder votes. Weeks pass. Then it closes, the money moves, and the success fee is finally earned. The analyst work here is light. The lawyers carry it.
Why the hours are lumpy
Put the stages together and you see why banking hours are famously unpredictable. Work arrives in bursts tied to external events you don't control: a pitch deadline, a buyer's question, a first-round bid date, a negotiation that suddenly heats up at midnight.
The baseline is manageable. The spikes are not, and they stack when you're staffed on more than one live deal. A quiet Tuesday can become a 3am Wednesday because a buyer three time zones away sent one email. That's not bad management. That's the structure of a process that answers to outside parties on their clock.
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Frequently asked
- What are the stages of an M&A deal?
- A sell-side deal runs from pitch to close: win the mandate, prepare the marketing materials and model, reach out to buyers, run management meetings, collect bids, negotiate with the winner, complete due diligence, sign, and close. It is months of staged work, not one event.
- How long does an M&A deal take?
- Most sell-side processes run several months, often six to nine, from launch to close, and longer when regulatory approval is involved. The timeline stretches or compresses with deal size, the number of buyers, diligence findings, and financing, so no two deals move at the same pace.
- What does an analyst do on a live deal?
- The analyst carries each stage: building and updating the model, preparing the marketing materials, managing the data room, tracking buyer questions, and turning around edits at all hours. When activity spikes, around launch, bids, and closing, the analyst hours spike with it.
