The CIM: what is in it and how to walk through one
By SuperdayReps · Michigan Ross Undergrad | Wharton MBA · ex-Citi | ex-Greenhill · Former Head Mentor at a Leading IB Prep Service
10 min read · updated October 14, 2026
"Walk me through a CIM" is a real interview question, and it catches candidates who know the term only as a step in a list. They can say "teaser, NDA, CIM, IOIs" in order, then go quiet when asked what is actually inside the book. The question rewards anyone who can describe the document the way someone who has built one would.
The CIM, or confidential information memorandum, is the main selling document in a sell-side process. It is the single largest thing the analyst builds on a sale. This lesson covers what it is, where it sits, what is in it, who writes it, how a buyer reads it, and how to answer the question.
Where it sits
The process itself is covered in what a sell-side M&A process looks like. In one line:
Teaser → NDA → CIM → IOIs → management presentations and data room → final bids or LOIs → signing.
The teaser is a one or two page anonymous profile that tests interest. Buyers who want more sign an NDA, and only then receive the CIM along with a process letter that tells them when and how to bid. The CIM's job is to give a buyer enough to submit a first-round indication of interest (IOI), a non-binding price range.
That job defines the document. A first-round buyer has the CIM, the model the bank may share with it, and little else. So the CIM has to support a valuation by itself. Later rounds go much deeper through management presentations and the data room, but the IOI that decides whether a buyer gets that far is priced almost entirely off the CIM.
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Frequently asked
- What is a CIM?
- A confidential information memorandum is the main marketing document in a sell-side M&A process. Written by the sell-side bank with management, usually 40 to 80 pages, it describes the business, its market, management, historical financials and projections, and it is sent to potential buyers only after they sign an NDA. Buyers use it to submit their first-round indications of interest.
- What are the main sections of a CIM?
- An executive summary, the investment highlights, an industry overview, a business overview covering products, customers and operations, management, historical financials including an adjusted EBITDA bridge, management's projections, and an appendix. It deliberately leaves out a valuation or asking price, and the most sensitive data is held back for the data room in later rounds.
- Who writes the CIM?
- The sell-side deal team, with the analyst drafting most of it from management's materials and the operating model. The associate and VP shape and review it, the MD sets the investment story, and management and lawyers check every claim. It goes through many rounds of comments before it is sent out.
- How should I answer walk me through a CIM in an interview?
- Say what it is in one line, where it sits in the process, then walk the sections in order and finish with how a buyer reads it. Keep it under a minute. The detail that separates a strong answer is knowing what a buyer checks first: the adjusted EBITDA add-backs, customer concentration, and whether the projections look like the historical numbers.
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