How to Write a CIM (Step-by-Step Guide)
A confidential information memorandum is your most critical sell-side document. Learn the sections, structure, and techniques that win competitive bids.
A confidential information memorandum is the most consequential document in a sell-side M&A process. Every qualified buyer who receives your CIM will form their initial view of the company — and their first bid — based on what you put in it. The difference between a well-constructed CIM and a weak one is often the difference between a competitive process and a disappointing outcome.
This guide covers how experienced M&A advisors structure and write CIMs: what sections to include, how to frame the investment thesis, how to handle sensitive financial information, and how to produce a document that generates strong, competitive first-round offers. Tools like Fyside have automated much of the research and formatting pipeline, but the strategic judgment still sits with the advisor.
What Is a CIM?
A confidential information memorandum — also called an offering memorandum (OM), information memorandum (IM), or deal book — is a detailed document that describes a company available for sale. It is prepared by the sell-side advisor, reviewed and approved by management, and distributed to qualified buyers under NDA.
The CIM has a specific job: give a sophisticated buyer enough information to form a preliminary view of value and decide whether to proceed to management presentations. It is not a final due diligence package — that comes later, via the dataroom. But it needs to be detailed enough that a buyer can submit a credible first-round indication of interest (IOI).
A typical structured sale process distributes the CIM to 30–80 potential buyers. First-round offers are based almost entirely on what’s in the CIM. Getting this document right drives the number and quality of bids.
CIM vs. Deal Teaser vs. Pitchbook
It’s worth clarifying where the CIM sits in the broader document ecosystem before getting into structure:
- Deal teaser: A 2–4 page anonymized overview sent to prospective buyers before NDAs are signed. Designed to generate interest without disclosing the target’s identity.
- Pitchbook: The advisor’s pitch to the seller before the mandate is awarded. Focuses on deal strategy, valuation thesis, and credentials.
- CIM: The detailed marketing document distributed to buyers under NDA. The most important document in the process.
- Management presentation: A live presentation given to shortlisted buyers after first-round bids. Built from and consistent with the CIM.
Each document feeds the next. The CIM’s financial model should power both the pitchbook valuation and the management presentation financials.
Standard CIM Structure
1. Executive Summary (4–6 pages)
The executive summary is the most-read section of any CIM. Many buyers decide whether to engage based on it alone. It should be compelling without being promotional, and precise without being a data dump.
Standard sections:
- Company overview: One paragraph describing what the business does, who it serves, and where it operates. Write this as if explaining to a sophisticated person who knows nothing about the company.
- Investment highlights: 4–6 bullet points summarizing the strongest reasons to acquire. These should be specific and defensible — not generic (“attractive market,” “strong management”).
- Financial summary table: Revenue, EBITDA, EBITDA margin, and YoY growth for the last 3 years + LTM. Clean and clearly labeled.
- Transaction overview: Deal structure (asset vs. stock), seller objectives, process timeline.
Write the executive summary last. The numbers and thesis will only crystallize after you’ve built the full financial analysis and worked through the business section.
Investment highlight framing: Experienced advisors think carefully about what differentiates this company from generic alternatives. Strong investment highlights are specific:
“90% gross revenue retention over the trailing 36 months, driven by multi-year contract structures and deep integration into customer workflows.”
Weak ones are generic:
“Recurring revenue model with loyal customer base.”
The difference is what a buyer remembers after reading 12 CIMs in a week.
2. Business Overview (8–15 pages)
The business overview is where you tell the company’s story. It should be factual, organized, and written to give a buyer confidence they understand the business — not to imply more than what’s actually there.
Key sections:
Company history and background When was the company founded, and what were the key inflection points? Acquisitions, product pivots, leadership changes, geographic expansions. A timeline works well visually.
Products and services Describe what the company sells, at what price points, and to whom. For multi-product companies, present a clear revenue breakdown. Don’t bury the core business under complexity.
Customer overview
- Total customer count and active accounts
- Revenue concentration (top 5, top 10 customers as a % of revenue)
- Average contract value (ACV) or customer lifetime value
- Customer tenure and churn / retention data
- Key customer logos (with permission)
High customer concentration (one customer = >20% of revenue) is a red flag buyers will probe. Address it proactively in the CIM rather than hoping buyers won’t notice.
Go-to-market model How does the company find and win customers? Direct sales, channel partners, inbound, events? What is the sales cycle length? How large is the sales team and what does a quota carrier look like?
Operations For manufacturing or service businesses: capacity, facilities, supply chain, headcount by function. For software businesses: technical architecture (without proprietary detail), deployment model, uptime/reliability metrics.
People and management Brief bios for the CEO, CFO, and key department heads. Highlight tenure and relevant experience. Note any planned leadership transitions post-closing.
3. Industry and Market Analysis (4–6 pages)
Position the company within its market. This section establishes context for the financial performance and growth opportunity. Cite authoritative external sources — buyers will fact-check.
Key sections:
Market definition and sizing Define the market the company operates in clearly. What’s the TAM, and how is it measured? Growth rate over the last 3–5 years and projections for the next 3–5. Source: industry reports (IBISWorld, Gartner, Forrester, S&P Global).
Market structure Is the sector fragmented or consolidated? Who are the major participants (by category, not by name)? What does consolidation activity look like — has PE capital entered the space?
Key trends and tailwinds What macro or sector trends are driving growth? Regulatory changes, technology adoption, demographic shifts. Be specific and cite the data.
Competitive landscape Describe how the company is positioned relative to the market — without naming specific competitors. Frame by category: “large enterprise software vendors,” “offshore service providers,” “regional specialists.” Position the company’s key differentiators clearly.
Bain & Company’s research on M&A value creation consistently shows that buyers who have conviction on the market thesis are willing to pay premium multiples. This section is where that conviction gets built — or doesn’t.
4. Financial Performance (12–20 pages)
The financial section is where sophisticated buyers spend the most time. Every number needs to be internally consistent, clearly sourced, and precisely labeled.
Key sections:
Historical income statement (3 years + LTM) Revenue, gross profit, gross margin %, operating expenses by category, EBITDA, EBITDA margin %. Include QoQ revenue data if the business has seasonality.
Revenue analysis Break revenue by segment, product, customer type, and/or geography. Show organic growth vs. acquired revenue if applicable. For subscription businesses: ARR/MRR bridge, new logo ARR, expansion ARR, churn ARR.
Adjusted EBITDA reconciliation This is one of the most important and most scrutinized tables in the CIM. List every addback, with a clear description and supporting rationale:
| Addback | Amount | Description |
|---|---|---|
| Owner compensation normalization | $425K | Owner comp above market rate; replaced with market CEO salary |
| Non-recurring legal settlement | $280K | One-time litigation expense, settled 2025 |
| Facility lease termination | $110K | One-time cost; new lease at market rate |
Buyers and their advisors will push back on every addback. Be conservative. Inflated adjusted EBITDA that doesn’t survive due diligence erodes trust and can kill deals late in the process.
Balance sheet overview Key items: cash, working capital (AR days, AP days, inventory), debt (amount, structure, maturity), and any off-balance sheet obligations.
Capital expenditure profile Maintenance capex vs. growth capex. For asset-light businesses: explain why capex is low. For capital-intensive businesses: explain the return on invested capital.
Management projections (2 years forward) Include management’s projections with clear assumptions. Build in a sensitivity table showing the impact of key variables (revenue growth ±5%, EBITDA margin ±200bps). Sophisticated buyers will build their own model and will appreciate the transparency.
5. Comparable Company Analysis (2–3 pages)
Include a summary comparable company analysis showing where the company sits relative to public peers on key metrics and multiples. This anchors the buyer’s valuation framework before they get to their own analysis.
Present:
- A table of 6–10 comparable public companies with EV/Revenue and EV/EBITDA multiples
- The company’s positioning on growth rate and margin profile relative to the peer set
- Brief commentary on premium/discount rationale
Fyside automatically builds this comp table from 332K deal comps and 120K buyer profiles sourced from Capital IQ — the same dataset investment banks use internally. Request early access →
6. Transaction Overview (2–4 pages)
What buyers need to know:
- Deal structure: asset sale vs. stock sale vs. merger
- Seller’s objectives: full exit, partial sale, management rollover
- Proposed timeline: IOI deadline, management presentations, LOI deadline, close target
- Process contact: who to reach for questions, how to submit offers
Rollover and management: If the management team is rolling equity, say so clearly — it signals alignment and is often a positive for buyers. If management is not staying, address that directly.
Common CIM Mistakes to Avoid
1. Overpromising and underdelivering on projections. Buyers have seen enough CIMs to know that management projections are optimistic. Build credibility by being reasonable — then let the business outperform in diligence.
2. Burying customer concentration. If two customers represent 55% of revenue, buyers will find out in diligence. Address it proactively, explain the relationship strength, and put guardrails around it. Surprises late in a process destroy deals.
3. Inconsistent numbers across sections. A common and avoidable problem: the revenue on page 8 doesn’t match the revenue in the financial summary on page 3. Use a single source financial model and populate all exhibits from it.
4. Poor adjusted EBITDA documentation. Addbacks without clear descriptions invite skepticism. Some buyers will haircut addbacks by 50% just because they’re not documented.
5. Generic investment thesis. “Market-leading position with strong growth” is not a thesis — it’s a placeholder. Every investment highlight should be specific, measurable, and defensible.
The Production Timeline
A well-run CIM production process typically looks like this:
| Week | Activity |
|---|---|
| 1–2 | Management interviews, data collection, financial model build |
| 3–4 | Draft CIM sections (business overview, industry, financials) |
| 5 | Management review, iteration, financial verification |
| 6 | Design and formatting, legal review |
| 7 | Final approval, NDA setup, dataroom preparation |
| 8 | CIM distribution to qualified buyers |
This timeline assumes a cooperative management team and clean historical financials. Deals with messy books or complex corporate structures routinely take 10–12 weeks to produce a distributable CIM.
According to PwC’s M&A integration research, the quality of deal documentation in the marketing phase directly correlates with buyer confidence and first-round bid competitiveness. Advisors who invest in production quality typically see 15–25% more first-round bids than those who rush to market.
How AI Accelerates CIM Production
The most time-consuming parts of CIM production — comps research, financial table formatting, precedent transaction analysis, and slide design — are also the most automatable. The judgment work — investment thesis framing, addback analysis, customer relationship narratives — requires experienced banker input that AI cannot replace.
Tools like Fyside automate the research, comp selection, and formatting pipeline — compressing what traditionally takes two weeks to under an hour on the analytical infrastructure. Request early access →
The advisor’s time shifts from formatting spreadsheets to reviewing and refining — a much higher-leverage use of expertise.
Related Guides and Resources
Frequently Asked Questions
What is a CIM in investment banking?
A CIM (Confidential Information Memorandum) is a detailed marketing document prepared by a sell-side advisor describing a company available for sale. It provides prospective buyers with a comprehensive view of the business — financials, operations, market position, and growth opportunities — and is used to solicit offers in a structured M&A process.
How long is a CIM?
A well-constructed CIM typically runs 40–80 pages. Simple deals or smaller companies may produce a 25–40 page CIM. More complex businesses with multiple segments or geographies commonly exceed 80 pages. Length should be driven by what a sophisticated buyer needs to make an offer, not by page count targets.
What is the difference between a CIM and a pitchbook?
A pitchbook is used before a mandate is signed — it's a pitch to the business owner or board to win the engagement. A CIM is prepared after the mandate and is distributed to qualified buyers who have signed an NDA. The CIM goes into far more operational and financial detail than a pitchbook.
What goes in a CIM executive summary?
The CIM executive summary typically covers: company overview (what it does, where it operates), financial highlights (revenue, EBITDA, growth), investment highlights (3–5 key reasons to buy), and transaction overview (structure, objective, process). It should be readable in under 5 minutes and compelling enough to generate buyer interest.
Who reads a CIM?
CIMs are distributed to qualified buyers — strategic acquirers and financial sponsors (private equity firms) — who have executed a non-disclosure agreement (NDA). The primary audience is corporate development teams at strategic buyers and deal professionals at PE firms. The document must be credible to sophisticated readers who will verify every claim.
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