Private Equity Due Diligence: The Complete Process for Fund Managers and LPs

Due diligence in private equity operates on two distinct levels: the diligence a GP conducts on target companies before investing, and the diligence an LP conducts on a GP before committing capital. According to a 2024 Preqin survey, institutional LPs spend an average of 4.2 months on fund-level due diligence for established managers and 5.8 months for emerging managers, with operational due diligence adding 30-45 days beyond investment diligence (Source: Preqin Investor Outlook 2024). Both processes have become more rigorous over the past decade, and understanding how each works is essential whether you sit on the GP or LP side of the table.

This guide covers both sides of the due diligence equation: what GPs evaluate when underwriting deals, and what LPs evaluate when underwriting GPs.

GP deal-level due diligence

When a GP identifies a potential investment, due diligence is the process that converts a thesis into a decision. It typically begins after a letter of intent (LOI) is signed and runs 60 to 90 days before closing.

Financial due diligence

Financial DD is the backbone of deal-level diligence. The objective is to verify the target company’s financial performance, understand the quality of earnings, and validate the assumptions underpinning the investment thesis.

Key workstreams include:

Quality of earnings (QoE) analysis. This is usually performed by a third-party accounting firm. It separates recurring, sustainable earnings from one-time items, owner adjustments, and accounting anomalies. The QoE report is the single most important financial DD deliverable because it establishes the “real” EBITDA that drives valuation and debt capacity.

Revenue analysis. Breaking down revenue by customer, product, geography, and contract type. The GP is looking for concentration risk (heavy dependence on a few customers), sustainability (recurring vs one-time revenue), and growth trajectory. Customer churn rates, net revenue retention, and cohort analysis are standard in software and technology deals.

Working capital normalization. Establishing a normalized working capital target ensures the seller delivers the business with adequate operating liquidity at close. Deviations from the target result in purchase price adjustments, making this a high-stakes negotiation point.

Debt and debt-like items. Identifying all obligations that should be treated as debt at closing, including deferred revenue, accrued liabilities, unfunded pension obligations, and off-balance-sheet commitments.

Legal due diligence

Legal DD assesses the target’s contractual, regulatory, and litigation exposure. It is typically led by the GP’s outside counsel with support from specialized firms for regulatory matters.

Core areas include:

• Material contracts. Reviewing customer agreements, supplier contracts, leases, and partnership arrangements for change-of-control provisions, termination rights, and unfavorable terms that could affect the business post-acquisition.
• Intellectual property. Verifying ownership, patent and trademark registrations, licensing agreements, and any IP disputes. In technology deals, confirming that the company owns its core technology and that employee invention assignment agreements are in place.
• Litigation and regulatory. Identifying pending or threatened litigation, regulatory investigations, and compliance gaps. Environmental liabilities, in particular, can create open-ended exposure if not properly diligenced.
• Corporate structure. Confirming the entity structure, capitalization table, and that all equity issuances were properly authorized. Missing board consents or improperly issued stock options can delay or derail a closing.

Operational due diligence

Operational DD evaluates whether the target company can execute the GP’s value creation plan. This goes beyond the numbers to assess the organization, systems, and processes that drive performance.

Management team assessment. Evaluating the depth and capability of the leadership team, identifying key-person dependencies, and determining which executives will stay post-close. Many PE deals include management retention agreements and equity rollovers to align incentives.

Systems and infrastructure. Assessing ERP systems, IT infrastructure, cybersecurity posture, and whether the technology stack can support planned growth. Integration costs and technology migration risks are frequently underestimated.

Supply chain and operations. For manufacturing, distribution, and services businesses, understanding the operational footprint, supplier dependencies, capacity utilization, and scalability constraints.

Commercial due diligence

Commercial DD validates the market opportunity and competitive positioning that underpin the investment thesis. This is often conducted by a strategy consulting firm or the GP’s in-house operating team.

Market sizing and growth. Verifying the target’s addressable market size, growth rate, and the company’s realistic share trajectory. Bottom-up analysis (building from customer segments and use cases) is more credible than top-down estimates.

Competitive landscape. Mapping direct and indirect competitors, understanding differentiation, and assessing the sustainability of competitive advantages. Customer and industry expert interviews are the most valuable inputs here.

Customer diligence. Direct conversations with the target’s customers to validate satisfaction, switching costs, and likelihood of continued purchasing. Customer calls often surface risks that do not appear in financial statements.

Deal-level timeline

A typical GP due diligence process follows this sequence:

Compressed timelines are common in competitive auction processes, where GPs may have only 4 to 6 weeks for confirmatory diligence. This time pressure is why experienced PE firms have standardized diligence playbooks, pre-established relationships with QoE providers, legal counsel, and consultants, and a deal flow management system that keeps every workstream and deadline in one place.

LP fund-level due diligence

When an LP evaluates a GP for a fund commitment, the due diligence process is fundamentally different from deal-level diligence. The LP is underwriting a team, a strategy, and an organization rather than a specific asset.

Investment due diligence (IDD)

IDD evaluates whether the GP can generate attractive risk-adjusted returns. It covers:

Track record analysis. Reviewing the GP’s historical performance across prior funds, including IRR, DPI, TVPI, and PME relative to vintage-year benchmarks. Attribution analysis is critical: understanding which deals drove returns, whether the current team was responsible, and whether the strategy that generated past returns is still viable. Our DPI vs IRR comparison covers how LPs evaluate these metrics.

Strategy evaluation. Assessing whether the GP’s stated strategy is coherent, differentiated, and appropriately sized for the target fund. Strategy drift, where a GP’s actual investments diverge from their stated mandate, is a common red flag.

Team assessment. Evaluating team stability, depth, succession planning, and the quality of the GP’s decision-making process. LPs typically conduct extensive reference calls with co-investors, portfolio company executives, and former colleagues.

Pipeline and market timing. Understanding the GP’s current pipeline, deployment pace expectations, and how market conditions affect the strategy. A GP raising a growth equity fund when growth multiples are compressed needs a credible explanation for how they will generate returns in the current environment.

The private placement memorandum (PPM) and the due diligence questionnaire (DDQ) are the foundational documents for this process. LPs also commonly request access to a data room containing audited financials, sample quarterly reports, and reference lists. For GPs preparing these materials, our LP pitch deck framework and fundraising roadshow guide cover best practices.

Operational due diligence (ODD)

ODD gained prominence after high-profile fraud cases demonstrated that investment merit alone is insufficient. ODD evaluates the GP’s organizational infrastructure and risk management.

Fund administration and valuation. Confirming that the GP uses an independent fund administrator, that valuation policies follow industry standards (IPEV or FASB ASC 820), and that the annual audit is performed by a reputable firm.

Compliance and regulatory. Reviewing the GP’s compliance program, Form ADV (for SEC-registered advisers), code of ethics, personal trading policies, and any regulatory examination history. Allocation policies for co-investments, fees, and expenses receive particular scrutiny.

Cybersecurity and business continuity. Assessing data security practices, incident response plans, and business continuity provisions. These areas have moved from “nice to have” to mandatory checklist items for institutional LPs.

Key person and succession. Evaluating what happens if a key investment professional leaves. The LPA’s key person provisions, and whether they provide meaningful protection, are a core ODD concern.

Many larger LPs have dedicated ODD teams that operate independently from the investment team. A positive IDD recommendation can be overridden by an ODD failure, which is by design.

LP diligence timeline

For emerging managers, LPs often add additional steps: visiting the GP’s office, meeting junior team members, reviewing deal-level documentation from prior employers, and conducting more extensive background checks.

Our DDQ template tool provides the standardized framework LPs expect, which can save weeks of back-and-forth during the diligence process.

Common pitfalls

On the GP deal side:

• Relying on management projections without independent verification. The QoE and commercial DD exist precisely because sellers’ projections are optimistic by default.
• Underscoping IT and cybersecurity diligence. Post-close technology issues are among the most expensive surprises in PE portfolio management.
• Rushing diligence to meet auction deadlines. Compressed timelines increase the risk of missing material issues. Building a standardized diligence playbook reduces this risk without slowing the process.

On the LP fund side:

• Over-indexing on IRR without examining DPI and the composition of unrealized value.
• Skipping ODD or treating it as a checkbox exercise. Operational failures, from misvaluation to compliance violations, destroy returns as effectively as bad investments.
• Insufficient attribution analysis. A GP who claims a track record from a prior firm needs verification that they were genuinely responsible for the deals cited.

The bottom line

Due diligence is where conviction gets tested against evidence. For GPs, rigorous deal-level diligence protects against overpaying for assets and buying problems. For LPs, thorough fund-level diligence protects against committing capital to managers who cannot deliver on their stated strategy.

Both processes have become more sophisticated and more standardized over the past decade. The GPs and LPs who treat due diligence as a competitive advantage, rather than a compliance exercise, consistently make better decisions.

The Bottom Line

• GP deal-level diligence runs 60-90 days from LOI to close: The quality of earnings report is the single most important deliverable, establishing the “real” EBITDA that drives valuation and debt capacity. Never rely on management projections without independent verification.
• LP fund-level diligence averages 4.2 months for established managers and 5.8 months for emerging managers: Emerging manager diligence takes 30-50% longer because there is less institutional history to reference and more attribution verification required.
• ODD failures can override positive investment diligence: Many larger LPs have dedicated operational due diligence teams that operate independently from the investment team. Lack of independent fund administration, compliance gaps, or cybersecurity weaknesses can kill a commitment regardless of returns.
• Customer concentration above 20% and EBITDA add-backs exceeding 25% are top deal-level red flags: On the fund side, GP turnover, inconsistencies between reported and audited returns, and related-party transactions without LPAC oversight are the most damaging findings.
• Have your operational infrastructure finalized before taking your first institutional meeting: Fund administration, compliance manual, valuation policy, and cybersecurity protocols should all be in place. Every gap discovered during diligence adds weeks or months to an already long timeline.