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Pre-LOI Due Diligence

The complete guide to what deal teams must verify before signing a Letter of Intent

📅 July 2026⏱ 10 min read👤 M&A professionals
1–4 wks
Traditional pre-LOI timeline
<1 hr
With proprietary-algorithm screening
50–70%
Of deals die post-LOI
$49
Per report with dodilligence

Pre-LOI Screens Should Not Cost Six Figures

Big-4 and boutique pre-LOI work often runs $25K–$100K before you even sign. Get a first-pass public-info screen from $49 and save advisor hours for confirmatory work.

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What Is Pre-LOI Due Diligence?

Pre-LOI due diligence is the preliminary investigation a buyer conducts before issuing a Letter of Intent (LOI). Unlike the deep confirmatory diligence that comes after an LOI — with full data room access and third-party advisors — pre-LOI diligence is about answering one question: Is this target worth pursuing?

Think of it as the difference between a first date and a background check. You’re not verifying every line item yet. You’re checking for deal-killing issues, validating that the business is what the CIM (Confidentiality Information Memorandum) claims, and deciding whether to commit to exclusivity.

The pre-LOI phase is where the most value is created or destroyed in an acquisition. A thorough pre-LOI screen catches fatal flaws before you spend $100K+ on advisors, commit to a 90-day exclusivity period, or — worst case — discover the problem during confirmatory diligence after you’ve already mentally committed to the deal.

Why Pre-LOI Diligence Matters

The Cost of Skipping It

Deals that die post-LOI are expensive. You’ve already paid for:

  • Legal fees for LOI drafting and negotiation ($10K–$50K)
  • Quality of earnings analysis ($30K–$80K)
  • Specialist consultants (IT, environmental, HR) ($20K–$60K each)
  • Internal team time (200+ hours across deal team)
  • Opportunity cost — your team wasn’t looking at other deals

Most importantly, a busted deal damages your reputation with brokers, sellers, and lenders. Do it twice and you start losing deal flow.

The Pre-LOI Due Diligence Checklist

Use this checklist before committing to an LOI. Each item can be screened using public data, the CIM, and a management call — no data room required.

🏢 Corporate & Legal

  • Entity structure & ownership chain
  • Registered jurisdiction & good standing
  • Litigation history (active & settled)
  • IP registrations & ownership
  • Material contracts (top 5 customers)
  • Employment agreements & key-person clauses
  • Regulatory licenses & permits

💰 Financial Screening

  • Revenue trend (3-yr TTM)
  • Gross & net margins (vs industry)
  • EBITDA & adjusted EBITDA quality
  • Working capital trends
  • Debt structure & covenants
  • Capex requirements (maintenance vs growth)
  • Customer concentration (top 5)
  • Revenue recognition policy changes

📊 Market & Competitive

  • TAM/SAM/SOM validation
  • Market share & position
  • Competitive landscape (3-5 key players)
  • Industry growth rate & headwinds
  • Switching costs & barriers to entry
  • Pricing power & differentiation
  • Regulatory/legislative risk

⚙️ Operational Quick-Scan

  • Key-person dependency
  • Supply chain concentration
  • Technology stack & debt
  • Data security posture (breaches?)
  • Employee count & turnover rate
  • Facilities & lease obligations
  • CMS/QMS compliance (if applicable)

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Deal-Killing Red Flags to Catch Pre-LOI

These are the issues that blow up deals in confirmatory diligence. Catch them now and walk away — or use them to negotiate a better price.

🚩 Declining Revenue Disguised by Accounting Changes

The CIM shows “growing” revenue, but a closer look reveals a revenue recognition policy change that pulled forward future revenue. Always compare TTM revenue under both old and new policies.

🚩 Customer Concentration Above 30%

If one customer represents more than 30% of revenue, losing them post-close can be catastrophic. This is the #1 deal-killer in PE diligence. Check renewal rates, contract length, and whether the relationship is with the company or a specific salesperson.

🚩 Undisclosed or Pending Litigation

Active lawsuits don’t always kill deals, but undisclosed ones do. Search PACER, state court records, and Google for the company + “lawsuit.” A company that hides litigation will hide other things too.

🚩 Key-Person Dependency with No Succession Plan

If the founder/CEO is the rainmaker, product visionary, and relationship holder — and there’s no #2 — you’re buying a job, not a business. Post-close retention risk is enormous.

🚩 Inconsistent Financial Reporting Between Periods

If Q3 financials were prepared on a cash basis and Q4 on accrual, or if the company changed fiscal year-ends mid-stream, the numbers are being managed. Demand consistent, audited (or at least reviewed) financials.

🚩 Supply Chain Single-Point-of-Failure

One supplier providing 80%+ of a critical component with no qualified second source. A supply disruption post-close can wipe out a year of EBITDA.

Green Flags — Signs of a Quality Target

✅ Diversified, Recurring Revenue

Revenue spread across 20+ customers, with 70%+ recurring (subscriptions, contracts, service agreements). Low churn. This is what PE firms pay a premium for.

✅ Clean Cap Table with Aligned Sellers

Few shareholders, all rolling equity post-close, no disgruntled minority owners. Management team staying for 3+ year earnout.

✅ Documented Processes & Systems

SOPs, an ERP system, documented customer onboarding. The business runs without the founder’s daily involvement.

✅ Upward Margin Trends

Margins improving 2-3 years running, with a clear explanation (pricing power, efficiency gains, scale). Not just one-time cost cuts.

The Pre-LOI Timeline

Here’s how a disciplined pre-LOI process unfolds — and where AI compresses the timeline.

1

Initial Screening (Day 1-3)

Review CIM, management presentation, and any preliminary data. Decision: proceed or pass. With AI: Run a comprehensive report in under an hour covering all public data on the company.

2

Public Data Deep-Dive (Day 3-7)

Research financials, litigation, IP, regulatory filings, news, social media, employee reviews (Glassdoor), and competitive positioning. With AI: All of this is compiled automatically into a structured report with sources cited.

3

Management Call (Day 5-10)

First call with management. Use this to validate findings, ask about gaps, and assess culture/chemistry. Come prepared with specific questions from your research.

4

Red Flag Assessment (Day 7-14)

Synthesize findings. Are there deal-killing issues? Is the valuation range supported by the data? What conditions should the LOI include?

5

LOI Drafting & Negotiation (Day 10-21)

Draft LOI with your legal team. Include valuation, structure, exclusivity period (60-90 days), and any conditions precedent discovered during pre-LOI screening.

6

LOI Signed → Confirmatory Diligence Begins

Exclusivity period starts. Full data room access. Quality of earnings, legal DD, IT assessment, environmental (if applicable). This is where the real money gets spent.

What a Strong LOI Includes

Binding Clauses (enforceable)

  • Exclusivity / No-Shop: 60-90 days during which the seller cannot engage other buyers
  • Confidentiality: NDA terms covering all information exchanged
  • Expense Allocation: Who pays for what if the deal falls through
  • Governing Law & Jurisdiction: Which state/country law applies

Non-Binding Terms (subject to confirmatory DD)

  • Purchase Price: Range or specific number, plus structure (cash/stock/earnout)
  • Deal Structure: Asset vs stock purchase
  • Working Capital Target: Peg for the closing balance sheet
  • Management Retention: Equity rollover, earnouts, employment agreements
  • Conditions Precedent: Financing, regulatory approval, DD satisfaction
  • Timeline: Target closing date and milestones

Cost Comparison: Manual vs proprietary-algorithm

FactorTraditional (Analyst/Consultant)dodilligence AI Report
Timeline1–4 weeks per target< 1 hour
Cost per target$5,000–$25,000$49
Sources checked10–20 (analyst-dependent)40+ (automated)
ConsistencyVaries by analystStandardized every time
Screen multiple targetsProhibitively expensiveRun 10 from $490
Red flag detectionSubject to human errorSystematic, every report

Frequently Asked Questions

What is pre-LOI due diligence?
Pre-LOI due diligence is the initial screening process before signing a Letter of Intent. It focuses on verifying that a target company is worth pursuing, checking for deal-killing issues, and establishing exclusivity terms.
How long does pre-LOI due diligence take?
Pre-LOI due diligence typically takes 1-4 weeks for traditional manual research. dodilligence can compress this to under an hour.
What are the biggest red flags before signing an LOI?
The biggest pre-LOI red flags include undisclosed litigation, declining revenue masked by accounting changes, key-person dependency, customer concentration above 30%, and inconsistent financial reporting.
What happens after the LOI is signed?
After signing an LOI, the deal enters confirmatory due diligence with full data room access, quality of earnings analysis, and legal review. The LOI typically includes a 60-90 day exclusivity period.
Is an LOI legally binding?
Most Letters of Intent are non-binding except for exclusivity, confidentiality, expense, and governing law clauses. Purchase price and structure are subject to confirmatory diligence.
How much does pre-LOI due diligence cost?
Traditional pre-LOI diligence costs $5,000-$25,000 per target. dodilligence provide comprehensive reports from $49 per company.

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Related Resources

This guide is for informational purposes only and does not constitute legal, financial, or investment advice. Always consult qualified professionals before making acquisition decisions.

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