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VDR glossary · Due diligence

What is due diligence?

Definition

Due diligence: The structured investigation a buyer or investor carries out before committing to a deal, checking the target's finances, legal position, operations and risks against what it has been told.

How due diligence typically runs through a data room

  1. 1 NDA and room opening The buyer signs confidentiality terms and its team receives accounts with agreed access rights.
  2. 2 Request list Advisers send structured requests by workstream, mapped to the room index.
  3. 3 Document review Financial, legal, tax, commercial and technical specialists read and note findings.
  4. 4 Questions and answers Gaps and follow-ups go through the Q&A log until each item is closed or escalated.
  5. 5 Reports and signing Findings shape price, warranties and conditions in the final agreement, which is then signed.
The record of what was disclosed in the room often matters again later, in warranty claims and disputes.
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A simplified sequence; in auctions the review is split across rounds, and some steps overlap.

How it works in a data room

Diligence starts once confidentiality is in place and the seller opens the room. The buyer’s advisers split the work by discipline: financial, legal, tax, commercial, technology and sometimes environmental or ESG. Each team works from a request list, reads the documents mapped to its items, and raises questions through the room’s Q&A. Findings flow into reports that the buyer’s deal team uses to decide price, structure and contract protections.

Why it matters in a deal

Diligence is how a buyer turns a seller’s story into evidence. Problems it uncovers can lower the price, move risk through specific indemnities, add conditions to closing or end the deal. For the seller, preparing the room well reduces surprises and keeps leverage. The data room’s audit trail also records what was disclosed and when, which often decides later disputes over warranties. Our due diligence industry guide shows typical room setups and timelines.

Example

A private equity firm reviews a German auto parts supplier over six weeks. Its accountants find that one customer accounts for 38 percent of revenue under a contract that can be ended on short notice. The finding goes into a red flag report, and the firm negotiates a lower headline price plus an earn-out tied to that customer’s renewal.

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