Source reliability checks in investment due diligence

Source reliability checks in investment due diligence should test who produced each document, whether the source is independent, when it was created, how it can be verified and what contradicts it. A neat data room can still contain copied figures, stale reports or evidence supplied by a party with an undisclosed interest.

The purpose is not to collect the largest number of documents. It is to decide whether the evidence supports the investment thesis and whether unresolved uncertainty stays within the fund’s mandate and risk tolerance.

Use the MAS observations in context

The May 2026 MAS information paper on risk management practices draws on thematic inspections of fund management companies. It covers governance, policies, fund launches, investment due diligence and ongoing monitoring. It is supervisory guidance and inspection evidence, not a new Act.

MAS reported weaknesses that included failures to verify the authenticity of trade receivables, insufficient assessment of borrowers or guarantors and weak review of redemption mismatches in fund-of-funds investments. These examples show why source quality matters at the point where an investment team turns information into a recommendation.

Each manager should apply the observations proportionately to its strategy, licence conditions, offering documents and policies. A listed equity fund, private credit fund and fund of funds need different evidence.

Identify the original source

Label every material item by origin. Distinguish issuer records, portfolio-company records, administrator data, bank evidence, registry searches, auditor reports, legal advice, valuation work, market data and management representations.

Ask whether the file came directly from the creator or through the target. A bank statement downloaded in a controlled session has a different evidential quality from a screenshot inserted in a presentation. A customer confirmation sent to an address controlled by management does not provide independent verification.

Keep the file name, date, provider and retrieval method. Where practical, retain a checksum or immutable data-room version so the team can identify later substitutions.

Check independence and conflicts

Record who appointed and paid each adviser. An expert may still provide useful work when engaged by the seller, but the investment team should understand the scope, assumptions, liability limits and access to underlying information.

Check relationships among directors, shareholders, borrowers, guarantors, customers, suppliers, valuers and intermediaries. A related counterparty can affect the weight given to confirmations and forecasts.

If the fund uses an external due-diligence provider, define which facts the provider verifies and which decisions remain with the manager. Outsourcing a workstream does not transfer the manager’s investment decision.

Test recency and period coverage

Match the date of each source to the decision date and the risk it supports. Audited financial statements may establish historical results, while current bank data, receivable ageing and covenant information may be needed to assess present liquidity.

Identify the period that each dataset covers. A full-year total can hide a late deterioration. A month-end balance may not reveal peak borrowing or repeated arrears during the month.

Set refresh triggers for time-sensitive evidence. If approval takes longer than expected, obtain updated sanctions checks, credit data, valuations, customer concentrations and material-contract status before closing.

Corroborate material claims

For each investment thesis claim, name the primary evidence and one corroborating source where the risk warrants it. Revenue can be tested against contracts, invoices, bank receipts, tax records and customer confirmations. Asset ownership may require registry searches, title documents, insurance and physical inspection.

Do not count multiple copies of the same underlying data as corroboration. A management deck, lender pack and adviser model may all draw from one spreadsheet.

When evidence conflicts, preserve both versions and investigate the reason. Do not silently select the number that supports the proposed return.

Assess reliability without hiding judgment

A rating can help prioritise work, but it should not replace the written reason. State which risk the source supports, the limitation and the effect on the investment decision.

Escalate gaps before approval

Classify an unresolved gap by impact and likelihood. The response may be more work, a condition precedent, a price adjustment, stronger documentation, a risk limit, enhanced monitoring or rejection.

Record who accepted the residual risk and under which authority. The approval minutes should show the contradiction, the challenge made and the basis for proceeding. Verbal comfort does not close an evidence gap.

Preserve the search date, query and result when a registry or public database supports a decision. For externally supplied confirmations, record the contact route and how the team established the respondent’s identity. These details let a later reviewer repeat the work, distinguish genuine new information from a copied file and understand why the investment committee relied on the evidence.

The due-diligence exception register supports unresolved items. The ongoing monitoring guide carries important sources into ownership. The Singapore VCC launch readiness guide is the pillar cornerstone.

Carry reliable sources into monitoring

Before closing, convert key evidence into a monitoring schedule. Name the provider, frequency, expected format and escalation threshold. For private credit, this may include bank statements, borrower reporting and covenant certificates. For a fund of funds, it may include liquidity and redemption information.

Source reliability checks in investment due diligence create a traceable bridge from claim to evidence, challenge and decision. The Funds, VCCs and Cross-Border Structures hub connects the manager’s wider governance and operating library.