M&A Process: What Actually Happens From Mandate to Close
Michael King, PE Investment Manager · 11 min read · (updated )
- A sell-side M&A process has 11 distinct steps spanning 4-6 months from mandate to close
- Key documents include the teaser, CIM, IOI, and SPA — know the purpose and timing of each
- Structure your interview answer in three phases: Preparation, Marketing, and Execution
- The most tested distinction: IOIs are non-binding with a range; final bids are binding with a specific price
The Sell-Side Process in 11 Steps
A sell-side M&A process typically takes 4-6 months. Here is what happens at each stage:
Key Documents
| Document | Purpose | Prepared By |
|---|---|---|
| Teaser | Anonymous one-pager with key metrics to gauge buyer interest | Sell-side bank |
| CIM | 50-100 page marketing document with company overview, financials, and investment highlights | Sell-side bank |
| IOI | Non-binding preliminary offer with a valuation range | Buyer |
| SPA | Binding legal contract defining all deal terms | Legal counsel (both sides) |
| Fairness Opinion | Independent assessment that the price is fair to shareholders | Independent bank/advisor |
How Interviewers Test This
The most common question: "Walk me through a sell-side M&A process."
Follow-up: "What is the difference between an IOI and a final bid?" An IOI is non-binding with a range; a final bid is binding with a specific price and marked-up SPA.
The Sponsor Dynamic — How Banks Actually Work With PE Firms
The textbook M&A process above covers sell-side advisory. But a growing share of deal flow involves PE sponsors, and that dynamic is worth understanding — especially if you are targeting LevFin or sponsor coverage roles.
When a PE firm acquires a company, it typically needs committed financing from banks. The reality of how this works is far more adversarial than the textbook suggests. Sponsors can and do demand extremely aggressive timelines — $800M of committed financing in a week is not unheard of. Banks frequently underwrite loose documentation terms because they assume the sponsor will fix terms in the market at no cost to the banks, even outside their flex provisions.
Credit investors on the other end have limited ability to push back on terms — if they protest too much, they simply do not get allocated on the transaction. LBO documentation terms have become incredibly loose, and the game is heavily skewed toward PE firms.
Capital markets roles at PE firms have proliferated significantly over the past five years, reflecting how central financing execution has become to the deal process. If you are interested in LevFin or capital markets, understanding this sponsor dynamic — not just the sell-side process — is what separates informed candidates from textbook ones.
Take Your Preparation Further
Download our free M&A Process Cheat Sheet for the complete process, key documents table, and interview Q&As. For a hands-on merger model, see the Merger Model Template.
For the first document a buy-side analyst actually reads when a process kicks off, see How to Read a CIM in 30 Minutes. For the financial-effects analysis that bankers run on every public-company merger, see EPS Accretion/Dilution Analysis Explained. For the alternative exit when the M&A market closes, see How IPOs Actually Work.
Ready for personalised feedback? Book a 1-on-1 mentoring session with an experienced IB/PE professional.
Frequently asked questions
How long does a sell-side M&A process take?
Typically 4-6 months from engagement letter to close, across 11 distinct steps. The front half is preparation and marketing — sell-side diligence, the CIM, screening the buyer universe, teaser distribution, NDAs and first-round indications. The back half is execution — management presentations, data room diligence, binding final bids, negotiation, signing and then close once any regulatory approvals land.
What is the difference between an IOI and a final bid?
An indication of interest is non-binding and carries a valuation range with high-level terms; a final bid is binding, names a specific price, and comes with a marked-up sale and purchase agreement. This is the most frequently tested distinction in the whole process, and it usually arrives as the immediate follow-up to 'walk me through a sell-side process'.
How should you structure the answer to 'walk me through an M&A process'?
In three phases rather than as a flat list. Preparation covers the engagement, the CIM and the buyer list. Marketing covers the teaser, NDAs, first-round bids and management presentations. Execution covers the data room, final bids, negotiation and close. Reciting 11 steps in sequence is the common mistake — grouping them demonstrates you understand the logic of the process rather than having memorised it.
What are the key documents in a sell-side process?
The teaser is an anonymous one-pager sent to gauge interest without naming the company. The CIM is the 50-100 page marketing document with the company overview, financials and investment highlights, released after an NDA is signed. The IOI is the buyer's non-binding preliminary offer. The SPA is the binding contract defining all deal terms, drafted and negotiated by legal counsel on both sides. A fairness opinion, where required, is an independent assessment that the price is fair to shareholders.
How does the process differ when the buyer is a private equity sponsor?
It becomes considerably more adversarial than the textbook version, because the sponsor typically needs committed financing from banks. Sponsors demand aggressive timelines — several hundred million of committed financing inside a week is not unusual — and banks frequently underwrite loose documentation terms on the assumption they can fix them in the market later. Credit investors have limited ability to push back, since protesting too hard means not being allocated. This dynamic is what separates informed candidates from textbook ones in LevFin and sponsor coverage interviews.