Indication of Interest (IOI) in M&A

An indication of interest — IOI — is the first formal signal a buyer sends to a sell-side advisor after reviewing the confidential information memorandum. It is non-binding, but it is not informal: a well-constructed IOI tells the advisor whether the buyer understands the business, has the firepower to close the deal, and is serious enough to invest further. It is the document that separates committed buyers from those who took a CIM and went quiet.

Bookbuild automates the CIM and pitchbook production pipeline so advisors can launch a competitive process with a broader, better-prepared buyer universe — compressing weeks of preparation into hours. Request early access →

---

Where the IOI Fits in the Sell-Side Process

The IOI is not the first document buyers see, and it is not the last document before close. It sits in the middle of the sell-side process — after NDAs and CIM distribution, before management presentations.

A standard sell-side timeline runs:

1. Advisor pitchbook — the advisor wins the mandate
2. Deal preparation — CIM, deal teaser, and buyer list developed
3. Teaser distribution — broad buyer outreach, anonymous
4. NDA execution — interested buyers sign non-disclosure agreements
5. CIM distribution — full CIM sent to NDA-signed buyers
6. IOI deadline — buyers submit non-binding indications of interest (typically 3–4 weeks post-CIM)
7. Management presentations — shortlisted buyers meet the management team
8. Data room access — qualified buyers conduct preliminary due diligence
9. LOI / binding offer deadline — buyers submit binding letters of intent
10. Exclusivity — one buyer enters a defined exclusivity period
11. Full due diligence and close

The IOI exists at step 6. Its function is straightforward: give the advisor enough information to decide which buyers deserve access to management presentations and, eventually, the data room.

---

What an IOI Is — and What It Is Not

Non-binding by design

An IOI does not create legal obligations. The buyer is not committed to the indicated price. The seller is not committed to the deal. Both parties retain full freedom to walk away. This is intentional — the IOI comes before the detailed due diligence that would justify firm commitments, and locking buyers into hard numbers at this stage would deter participation.

What an IOI does create is a documented position. When a buyer submits an IOI at $45M–$55M EV and later argues the business is worth $30M, the advisor and seller have a negotiating reference point. IOIs are not enforceable, but they are on record.

Different from a letter of intent

A letter of intent (LOI) comes after management presentations and typically requests exclusivity. It is more specific: a point price (not a range), a defined deal structure, representations on financing, and a due diligence timeline. LOIs are still non-binding on the primary deal terms, but they often include binding provisions on exclusivity, confidentiality, and expense allocation.

The IOI-to-LOI journey is a narrowing process. Ten buyers may submit IOIs; three advance to management presentations; one or two submit LOIs; one enters exclusivity.

---

What a Credible IOI Should Include

Advisors evaluate IOIs on substance, not length. A one-page IOI with clear answers to the key questions is more useful than a five-page document full of hedge language. Here is what a credible IOI covers:

1. Preliminary valuation range

The most important data point. Buyers typically express value as a range — for example, $40M–$50M enterprise value — based on their initial read of the CIM financials. A buyer who submits a wide range ($30M–$60M) or refuses to provide a range is often deprioritized, because the advisor cannot assess their seriousness without a valuation anchor.

2. Proposed deal structure

How the buyer intends to pay matters as much as how much they intend to pay. The IOI should specify:

• Cash vs. equity consideration
• Rollover equity expectations (if any)
• Earnout component (amount, metrics, duration)
• Assumed debt or working capital adjustments

A clean all-cash IOI at a lower price often beats a higher-priced offer laden with earnouts and equity.

3. Financing plan

Buyers should indicate how they plan to fund the acquisition: balance sheet cash, debt financing (committed or subject to credit approval), equity co-investors, or a combination. Strategic buyers often pay from their own balance sheet. Financial buyers (private equity) typically specify a leverage assumption and the equity check size.

An advisor running a competitive process needs to assess execution risk. A buyer with no committed financing is a different counterparty than one with a term sheet from their credit facility.

4. Key due diligence assumptions

Every IOI rests on assumptions. Buyers should flag the two or three diligence items that, if they come back unfavorably, would materially change their view of value. Common examples:

• Customer concentration (top customer accounting for a stated % of revenue)
• EBITDA normalization (management fees, one-time costs removed)
• Working capital seasonality
• Recurring vs. non-recurring revenue quality

Surfacing these upfront helps the advisor prepare for the management presentation and positions the buyer as credible and methodical.

5. Management retention expectations

Does the buyer want the founder or CEO to stay? For how long? On what terms? In a business where key-person risk is real, this question matters to the seller. Buyers who can articulate a clear and fair management retention plan typically get a warmer reception from seller-side management.

6. Proposed process and timeline

A rough indication of how long the buyer expects to need for due diligence and how they plan to structure the close. This signals whether the buyer is a serious counterparty or someone collecting optionality.

---

How Advisors Evaluate Inbound IOIs

When the IOI deadline passes, the advisor compiles all submissions and runs a comparative evaluation — typically across four dimensions:

Valuation. What is the buyer’s indicated range, and how does it compare to the advisor’s preliminary valuation view and to other IOIs received? A buyer at the top of the range moves forward. One below the seller’s floor typically does not, unless there are strategic reasons to include them.

Deal structure. Cash-certain offers with minimal contingencies are preferred over earnout-heavy structures. Advisors assess the risk-adjusted value of each offer, not just the headline number.

Financing credibility. A PE firm with a committed fund, an established credit relationship, and a clear equity check is more credible than a family office sourcing equity ad hoc. Strategic buyers with strong balance sheets are typically lower execution risk than leverage-dependent buyers.

Process seriousness. Did the buyer engage thoughtfully with the CIM? Did they surface informed diligence questions? Is the IOI specific and internally consistent? Advisors read IOIs for signals of engagement quality — a buyer who clearly read the CIM is a different counterparty than one who submitted a generic template.

According to McKinsey & Company, competitive M&A processes that advance multiple buyers to management presentations typically achieve 15–20% higher transaction values than single-buyer processes — making IOI selection a high-stakes decision for the advisor.

---

Using the IOI Process as a Competitive Lever

Experienced advisors do not treat the IOI round as a passive sorting exercise. They actively manage it to maximize competitive tension:

Set a firm deadline. A clear IOI deadline — typically three to four weeks after CIM distribution — creates urgency and prevents buyers from using the extended process to run parallel diligence on other targets.

Communicate selectively. After the IOI round, advisors often provide feedback to shortlisted buyers on where they stood relative to the field — not specific figures, but directional color (“your valuation was at the lower end of what we received”). This encourages shortlisted buyers to sharpen their LOI submissions.

Maintain optionality. Advancing three or four buyers to management presentations rather than one keeps competitive pressure alive through the next stage. Advisors who narrow too aggressively after IOIs often find themselves with limited leverage in LOI negotiations.

Manage seller expectations. IOI ranges can be wide. A seller who sees an IOI at $45M–$60M may anchor to $60M. Advisors who set expectations around the likely closing range — and explain what drives IOIs to narrow during diligence — serve their clients better than those who present the high end as the expected outcome.

Per PwC’s M&A integration research, misaligned valuation expectations between seller advisors and buyers are one of the most common causes of deal failure in later stages — reinforcing why IOI management and expectation-setting matter early.

---

Common IOI Mistakes

Submitting a range too wide to be meaningful. A $20M spread on a $50M deal tells the advisor nothing. Buyers who cannot narrow their range after reading the CIM either have not done the analysis or are hedging against bad news in diligence. Either signal is negative.

No financing detail. “Subject to financing” with no further detail is a red flag for execution risk. Buyers should be specific: committed facility, equity commitment letter, or at minimum a named lender with indicative terms.

Missing deal structure. IOIs that specify a price but not structure are incomplete. Earnouts, rollovers, and equity consideration change the economics materially. A buyer who cannot articulate how they intend to pay is not ready for management presentations.

Submitting late. Advisors note late IOIs even when they technically accept them. A buyer who cannot meet a four-week deadline signals process discipline problems. For highly competitive situations, advisors may exclude late submissions entirely.

Being too aggressive on terms. An IOI that demands heavy management reps and warranties, extended earnouts, and contingent pricing will be moved to the back of the stack in a competitive process. Save the aggressive term negotiation for after you have earned the right to be in exclusivity.

---

From IOI to LOI: What Changes

After management presentations, buyers who want to proceed submit a binding letter of intent. The LOI differs from the IOI in three important ways:

1. Specificity. The LOI names a price, not a range. All material deal terms — structure, earnouts, working capital target, reps and warranties framework — are specified.

2. Exclusivity. The LOI typically requests an exclusivity period — usually 30–60 days — during which the seller agrees not to negotiate with other buyers while full diligence is conducted. This is binding even though the headline deal terms are not.

3. Commitment signal. Submitting a binding LOI is a serious signal. The buyer has invested in two management meetings, preliminary data room review, and legal fees to draft the document. Walking away from an LOI is possible but costly for the buyer’s reputation in a relationship-driven market.

Advisors who ran a clean IOI process — with a defined deadline, clear communication, and genuine competitive tension — typically enter the LOI stage with better leverage and more committed buyers than those who ran an informal or poorly managed first round.

Tools like Bookbuild help advisors compress the CIM and pitchbook build so they reach the IOI round faster and with more buyer universe depth. Request early access →

---

Summary

The IOI is the bridge between CIM distribution and management presentations. For the advisor, it is a signal-gathering exercise: who has done the work, who has the capital, and who is serious. For the buyer, it is an opportunity to differentiate themselves from the field before the real competition begins.

Running a disciplined IOI process — clear deadlines, specific information requirements, active expectation management — is one of the most reliable ways advisors create competitive tension and drive transaction value.

Related reading:

• M&A NDA: The Confidentiality Agreement Explained
• CIM vs Pitchbook: Full Comparison for Advisors
• Letter of Intent (LOI) in M&A
• The Sell-Side M&A Process
• M&A Process Letter: Template and Best Practices