Expert calls for due diligence: a guide for investors

Expert calls give investors primary evidence to test a thesis before capital is committed. In a diligence context, an expert call is a paid, one-on-one conversation with a subject-matter operator, a former executive, a current practitioner, a customer, or a channel partner, who can speak to how a market or company actually behaves. Done well, these calls answer the specific questions that public filings, management presentations, and banker decks cannot, and they do it inside a deal timeline.

This guide is written for private equity, venture capital, hedge fund, and corporate development teams. It covers what expert calls are in diligence, when to use them, how to scope and source them quickly, how to handle compliance around conflicts and material non-public information, how to run the call, and how to synthesize what you hear into an investment view.

What an expert call is in a diligence context

Diligence is a search for reasons to say no. Expert calls are one of the few tools that produce fresh, decision-specific evidence rather than repackaging what is already public. Where a data room tells you what a company reports, an expert call tells you what an operator has seen firsthand: why customers actually churn, how procurement really decides, whether a competitor’s product is gaining, or how durable a pricing advantage is.

Expert calls sit alongside other primary methods. If you want to measure how widely a belief is held, a survey or a broader study is the right tool. If the decision turns on a handful of judgment-heavy questions that only insiders can answer, calls are better because they allow follow-up, probing, and nuance in real time. Many teams combine both, using calls to shape hypotheses and a structured study to size or validate them. For a fuller view of how these methods fit together, see our expert interviews for investment and consulting research guide.

The value of a call depends almost entirely on reaching the right person. A generalist consultant will give you a generalist answer. A former head of sales at the target’s largest competitor, or a procurement lead who has run the exact vendor selection you care about, will change how you underwrite the deal.

When to use expert calls

Expert calls earn their cost in specific situations. Reach for them when:

• The thesis hinges on a small number of specific, insider-only questions, such as real switching costs, contract renewal behavior, or the credibility of a growth plan.
• Public data is thin, contradictory, or too lagged to trust, which is common in private markets, niche B2B categories, and emerging technologies.
• You need to pressure-test what management told you against people with no incentive to sell the deal.
• The clock is short and you need directional conviction in days, not weeks.

They are a weaker fit when you need statistically representative measurement across a large population, when the question is purely quantitative and already covered by reliable data, or when the only people who can answer are so few and so conflicted that any conversation would raise compliance concerns. Knowing which method matches the question is a discipline in itself; our market research methodology guide walks through choosing the right approach for a given decision.

How to scope the calls before you source anyone

Sourcing before scoping wastes money and time. A tight scope makes every later step faster.

Start from the decision, not the topic. Write down the two or three findings that would most change your investment view, then work backward to the questions that would produce them and the profiles that could answer them credibly. A scope document usually names:

• The thesis and the specific sub-questions each call must inform.
• The expert profiles you want, by role, seniority, company type, geography, and recency of experience.
• The mix of perspectives, so you are not hearing only one side.
• Screening criteria and disqualifiers, including anyone too close to the target.

Balancing perspectives matters as much as expertise. A panel made only of former employees of the target will flatter or punish it in predictable ways. A stronger panel mixes former insiders, direct competitors, customers, and channel or supply-chain partners so that no single vantage point dominates the read. For deals that also need a top-down market read, pair calls with a structured sizing exercise; our market sizing and TAM validation guide shows how to keep that quantitative work honest.

Sourcing experts fast without a retainer

The traditional model is to keep an expert network on an annual retainer and draw down calls against it. That works for firms with steady, predictable volume, but deal flow is rarely steady. Retainers sit idle between deals and then feel slow exactly when a live deal needs experts this week.

On-demand platforms invert that. You source and pay per project, screen candidates against your scope, and schedule calls without a long contract. The tradeoffs between retainer networks and on-demand models, including coverage, speed, and cost, are laid out in our best expert network platforms comparison and in this primer on how expert networks connect companies with specialists.

CleverX is built for this pattern. It is an on-demand B2B research platform with more than 8 million verified professionals across 150+ countries, each verified through work email and LinkedIn so you know the operator is real and current. Teams typically source and complete calls in about two to five days on a pay-as-you-go basis with no retainer, which fits most diligence windows. For deals that need senior operators specifically, the tactics in our guide to recruiting C-level executives for research apply directly to sourcing diligence experts.

The verification step is not a nicety in a diligence context. If your investment committee is going to weigh a finding, you want to be certain the person who gave it holds the experience they claim.

Compliance: conflicts, MNPI, and disclosure

Expert calls in an investment context carry real compliance obligations. The guidance below reflects standard market practice and is general information, not legal advice. Your firm’s compliance team and counsel set the rules you follow.

The central risk is material non-public information, or MNPI. MNPI is information a reasonable investor would consider important to a trading or investment decision and that has not been disclosed to the public. Trading on MNPI, or passing it to someone who trades, can be unlawful. The core idea of what makes information material and non-public is described in the SEC’s guidance on material non-public information, and professional conduct standards such as the CFA Institute Code of Ethics set out how practitioners are expected to handle it.

Standard practice on an expert call includes several safeguards.

Safeguard	What it means in practice
Conflict screening	Screen experts before the call for ties to the target, current employment at the company or a direct competitor, and any duty of confidentiality that the topic would breach.
MNPI briefing	Tell the expert, on the record, not to share confidential, proprietary, or non-public information about any company, and to decline questions that would require it.
Scope discipline	Keep questions at the level of market dynamics, general practice, and the expert’s own experience, not the specific undisclosed numbers of a covered company.
Recordkeeping	Log who was consulted, when, and on what topic, so the firm can demonstrate a compliant process.
Escalation	Route anything ambiguous or sensitive to compliance or counsel before proceeding, and stop the call if MNPI surfaces.

A few practical rules make these safeguards real. Confirm the expert is not currently employed by the target or a company whose confidences the topic would compromise. Open every call by stating the ground rules aloud. If an expert starts to volunteer something that sounds like inside information, interrupt, redirect, and note it. When in doubt, treat the information as off-limits and check with compliance. A disciplined process protects the firm, the expert, and the integrity of the finding.

Running the call

Preparation is what separates a call that moves the thesis from one that fills an hour. Before the call, prepare a short guide built from the scope: the ground rules first, then your two or three must-answer questions, then follow-ups. Send nothing confidential in advance.

During the call, spend the first minute on compliance ground rules, then let the expert talk. The best material comes from open questions and patient follow-up, not from a checklist read at speed. Ask for specifics and examples rather than opinions: not “is the market growing” but “walk me through the last three deals you saw and who won them.” Listen for what the expert is uniquely positioned to know, and steer away from anything they would only know through a confidential position.

Note disconfirming evidence as carefully as confirming evidence. The point of diligence is to find the reason to walk, so a call that undercuts the thesis is more valuable than one that flatters it. Where volume and consistency matter, some teams use structured, AI-moderated formats to run more conversations with a consistent script; CleverX AI Interview Agents can conduct and transcribe interviews at scale so a small deal team can cover more ground inside the same window. The interviewing fundamentals in our guide to B2B expert interview methods apply whether a human or an agent runs the call.

Synthesizing calls into an investment view

Individual calls are anecdotes. An investment view comes from reading them together.

Work toward saturation. Keep running calls until new conversations stop producing new insight, the point where the next expert mostly confirms what you already heard. For a focused thesis that is often somewhere between five and fifteen calls, but the number should be driven by the questions, not a quota. If perspectives still conflict after several calls, that divergence is itself a finding worth underwriting carefully.

Synthesize by question, not by call. Line up what every expert said against each of your must-answer questions, weight views by how close the expert is to the evidence and how free they are of bias, and separate strong signal from single-source claims. Flag where the panel agreed, where it split, and why. Then translate the read back into the investment decision: what it means for the thesis, for the model’s key assumptions, and for the risks the deal committee will ask about. The habit of turning raw research into a decision is the same one covered in our guide on turning product research into better decisions, applied to an investment call.

The output should be short and decision-shaped: the thesis, what the calls confirmed, what they challenged, what remains open, and the resulting recommendation. A committee does not need transcripts. It needs a defensible read of what operators told you and what it means for the check.

The takeaway

Expert calls are one of the highest-leverage tools in diligence because they produce evidence tied directly to the decision, sourced from people who have actually seen the market work. The discipline is in the edges: scope from the decision backward, source verified operators fast, hold a clean line on conflicts and MNPI, run calls that seek disconfirming evidence, and synthesize by question into a view the committee can defend. Get those right and a handful of calls can change how you underwrite a deal.

For deal teams that need verified operators without a retainer, CleverX offers on-demand access to more than 8 million verified professionals across 150+ countries, with calls typically completed in two to five days on a pay-as-you-go basis. Start recruiting verified experts on CleverX.

Frequently asked questions

What is an expert call in due diligence?

An expert call is a paid, one-on-one conversation between an investor and a subject-matter operator, such as a former executive, a current practitioner, or a customer, used to test a thesis with primary evidence. In diligence it fills gaps that public data, management, and bankers cannot, like real churn behavior, buying criteria, or competitive dynamics.

When should investors use expert calls versus other research?

Use expert calls when the decision hinges on a small number of specific, judgment-heavy questions that only insiders can answer, and when timelines are short. Surveys are better for measuring how common a view is across a large group. Expert calls are best for depth, nuance, and follow-up on a live hypothesis.

What is MNPI and how do expert calls stay compliant?

MNPI is material non-public information that a reasonable investor would consider important and that has not been disclosed publicly. Trading on it can be illegal. Standard compliance practice is to screen experts for conflicts, brief them not to share confidential or non-public data, keep records, and route sensitive situations through compliance or counsel. This article is general guidance, not legal advice.

How fast can you source experts for a live deal?

With an on-demand platform, verified experts can be screened and scheduled within a few days rather than the weeks a traditional retainer can take. On CleverX, teams typically reach relevant, verified professionals and complete calls in about two to five days, which fits most diligence windows.

How many expert calls are enough for a diligence view?

There is no fixed number. Most teams run enough calls to reach saturation, the point where new conversations stop producing new insight, often between five and fifteen for a focused thesis. Balance perspectives across former insiders, competitors, customers, and channel partners so no single view dominates.

Do you need a retainer or expert network subscription to run expert calls?

No. Traditional expert networks often require annual retainers, but pay-as-you-go platforms let you source and run calls per project without a long contract. This suits deal teams with uneven, deadline-driven demand who do not want fixed subscription costs sitting idle between deals.