Due Diligence Data Room: Checklist, Setup & Best Practices (2026)

Due diligence is the review a buyer, investor or lender carries out before a deal to confirm that a business is what it appears to be. It covers the company's financial records, contracts, legal and regulatory position, people and technology. Sellers prepare by gathering those documents in a secure data room, and buyers work through them with a checklist.

TL;DR

1. Start with the documents. Plan on three years of financial statements and tax returns, plus legal, HR, operational, IP and compliance files.
2. Structure the room before anyone sees it. Numbered folders, one per document group, help reviewers find things fast.
3. Control access. Gate the room behind an NDA, keep documents view-only, and hold back customer names, pricing and employee data until later rounds.
4. Track who reads what. Page-level analytics show which parties are most engaged.
5. Expect weeks, not days. Software Equity Group says diligence on its deals usually takes 30 to 45 days, and many deals take 90 days or more to close.

In short: a ready data room and a clear checklist make due diligence faster for both sides.

Whether you're preparing for a merger, raising funds, or undergoing a legal audit, the due diligence process is a key part of ensuring transparency and trust. In this modern age, virtual data rooms have become the gold standard for managing due diligence, offering unparalleled security, organization, and insights. In this post, we'll cover what due diligence involves, the documents to prepare, buy-side and sell-side checklists you can download, and how to run it all in a data room.

What is Due Diligence?

Cornell Law School's Legal Information Institute defines due diligence as "the level of reasonable care or attention expected to avoid liability." In business, it means checking a company's records before you commit to a deal.

Due diligence is a comprehensive company review typically conducted before an investment or a merger/acquisition. The goal is to verify the company's health and identify any potential risks, ensuring all involved parties have a clear understanding of the transaction. For example, in M&A, due diligence involves reviewing financial statements, intellectual property & legal contracts.

Traditionally, this process has required the use of a physical room where confidential documents are reviewed, and was used to ensure that confidential information wasn’t leaked or stolen. Virtual Data Rooms have transformed this process by enabling a cheaper and easier way to share confidential documents.

What is a Due Diligence Data Room?

A due diligence data room is a secure online space that helps facilitate the secure sharing of confidential documents like financial statements, contracts, customer information or even patents. These modern virtual data rooms are designed to replace the traditional methods of managing physical documents or unsecured digital files, providing a centralized space where stakeholders can access and review everything online.

Due Diligence Checklist: What Documents Go in the Data Room

Use this checklist to prepare the data room if you're selling or raising money, or as a request list if you're buying or investing. The time periods follow FindLaw's due diligence checklist; buyers can ask for more.

Free download: get this checklist, plus the buy-side and sell-side steps below, as a printable PDF. [ADD LINK]

Financial Documents

1. Historical financial statements (last three years), with any auditor's reports
2. Profit & loss statements (last three years)
3. Balance sheets (last three years)
4. Cash flow statements (last three years)
5. Financial forecasts & budgets
6. Tax returns: federal, state, local and foreign (last three years)
7. Accounts receivable/payable aging reports
8. Debt schedules and loan agreements
9. Cap table (for startups)
10. Auditor's letters and replies (last five years)

Legal Documents

1. Articles of incorporation / company registration
2. Shareholder agreements
3. Board meeting minutes
4. Contracts (customers, vendors, partnerships)
5. NDAs and confidentiality agreements
6. Litigation history (if any)
7. Lease agreements
8. Licensing agreements

HR Documents

1. Employee contracts
2. Organizational chart
3. Compensation and benefits structure
4. Stock option / ESOP plans
5. Key employee agreements
6. HR policies (leave, conduct, etc.)

Operational Documents

1. Business model overview
2. SOPs (standard operating procedures)
3. Supplier and vendor agreements
4. Customer lists and segmentation
5. Sales pipeline and CRM exports
6. Product/service documentation

Intellectual Property (IP)

1. Patents and patent applications
2. Trademarks
3. Copyrights
4. Product source code (if applicable)
5. Technical architecture documentation
6. R&D documentation

Compliance & Regulatory

1. GDPR / data protection policies
2. Industry certifications
3. Regulatory filings
4. Environmental compliance (if relevant)
5. Internal risk assessments

Who uses Due Diligence Data Rooms?

1. M&A: Buyers and sellers can use virtual data rooms to review financial, legal, and operational documents before finalizing a transaction.
2. Fundraising: Startups and companies use data rooms to securely share their business model, financials, and growth plans with potential investors. Our investor data room checklist lists what investors ask for.
3. IPOs: Companies that go public use data rooms to provide underwriters, auditors and lawyers with access to relevant information.
4. Private Equity & Venture Capital: Private equity firms and venture capitalists typically use virtual data rooms to share details on their current funds to their investors.
5. Real Estate: Buyers, lenders and investors review leases, title documents and property financials before closing. Our real estate data room checklist covers the documents to prepare.

Why should you use a Data Room for Due Diligence?

Security

Virtual data rooms are designed with state of the art security features, such as device level security which verifies the intended recipient before allowing access to the data room. This updates the old and unsafe methods of securing your files with passwords alone.

Security Certifications

Encryption alone doesn't prove a provider is secure. Ask for independent evidence:

1. SOC 2 Type 2 report: an independent auditor's opinion, under the AICPA's SOC 2 framework, on whether the provider's controls were designed well and worked over a period of time.
2. ISO/IEC 27001 certificate: ISO calls it "the world's best-known standard for information security management systems." Certificates come from accredited certification bodies, not from ISO itself.
3. GDPR: the GDPR applies to companies in the EU and to companies outside it that offer goods or services to, or monitor, people in the EU. If your documents include personal data about people in the EU, check how it applies to your deal.

Orangedox is CASA Tier 2 certified: an independent third party audits the platform every year under the Cloud Application Security Assessment, a framework from the Google-led App Defense Alliance. Orangedox also encrypts files at rest with AES-256 and in transit with HTTPS/TLS, and publishes GDPR, CCPA and HIPAA compliance pages.

Tracking and Analytics

One of the most powerful uses of a virtual data room is its ability to track whenever a document is accessed. This allows you to see who’s accessing what document, including the time they spent on each page, giving you a clear understanding of who’s most interested in your deal.

Team Permissions

Virtual data rooms allow their administrators to assign permissions to specific users, ensuring only the right people have access to particular documents. Creation of multiple data rooms for different groups of stakeholders is a great way to help keep your security model clean and easy to maintain. In addition, most data room providers let you assign multiple administrators to your data room, allowing you to have the entire team keep the data room up to date.

Viewing Documents Online

Some virtual data room providers, like Orangedox, also let your participants preview documents within the browser without having to download them. This feature not only saves your participants time but also minimizes the risk of files being shared with others, keeping you in control of your confidential material.

When looking for a virtual data room provider during due diligence ensure it includes:

These are the features that matter most during due diligence. For a full buying guide, see how to choose a virtual data room.

Robust Security

Platforms like Orangedox employ powerful security measures that prevent your files from being forwarded & keep them in a read-only format. This way, the platform’s secure document sharing technology will always keep you in control of your documents, how they are shared, while ensuring that only the intended recipients can view the documents.

Data Residency for Cross-Border Deals

When buyers, sellers and advisors are in different countries, ask where your documents and their previews are stored, and which laws reach them. Two rules come up most:

1. GDPR transfers: personal data sent outside the European Economic Area needs a transfer mechanism, such as an adequacy decision or standard contractual clauses, as the European Commission explains.
2. The US CLOUD Act (2018): US-based providers must comply with valid US orders for data in their possession, custody or control, wherever that data is stored.

If personal data will cross borders during the deal, bring in your lawyers before you choose a provider.

Straightforward and Easy File Management

It’s essential to ensure your virtual data room is both well-organized and consistently up-to-date. A well-organized data room streamlines collaboration, reduces confusion, and improves efficiency when sharing important documents. What’s equally important is keeping your data room synchronized with the latest versions of your files. Manually reuploading or resending files can cause unnecessary delays and errors.

For these reasons, it’s best to select a data room platform that integrates seamlessly with your existing document management system, such as Google Drive or Dropbox. For instance, Orangedox offers seamless integration with Google Drive, enabling users to create data rooms that are synced with their cloud storage folders. This ensures that your shared files are automatically updated and always up to date.

Tracking and Advanced Metrics

During any deal it’s always an advantage to know who’s most interested, preventing you from wasting your time with investors who aren’t very interested. Providers like Orangedox can provide detailed document metrics, including page view times, allowing you to know exactly who’s most interested in your deal.

Teams Management

Providing your team access to your data rooms will help close your deals faster, ensuring documents are always up to date and access is granted to the appropriate investors as soon as possible.

Orangedox supports teams of any size, allowing you to allocate access to your shared data rooms to multiple admins at once.

How to Structure Your Due Diligence Data Room

Recommended Folder Structure

Because Orangedox syncs directly with Google Drive, you can mirror this exact structure in your existing folders, eliminating the need to rebuild your data room from scratch.

Step-by-Step: Setting Up a Data Room for Due Diligence

Step 1: Organize Your Files

Structure your folders in Google Drive (or Dropbox) following the hierarchy above.

Step 2: Connect to Orangedox

Create your data room directly from your existing cloud storage, no re-uploading needed. In the Data Room app, select Create New Room, give the room a title and pick your Google Drive or Dropbox folder.

Step 3: Documents Synced

Because of the integration, your files stay automatically updated, avoiding version control issues. Files you add, update or remove in the folder show up in the data room automatically.

Step 4: Invite Stakeholders

Add investors, buyers, or auditors one by one or in bulk, then choose whether Orangedox emails their access links or you send them yourself.

Step 5: Set Permissions

1. Give each group of stakeholders its own data room
2. Restrict downloads, so documents stay view-only
3. Set device limits
4. Enable dynamic watermarking (Teams plan)

Step 6: Enable NDA Gating (if needed)

Ensure viewers accept your NDA before accessing sensitive files. Here's how NDA gating works.

Step 7: Track Engagement

Use document analytics to:

1. See who opened what
2. Track time spent per page
3. Identify high-intent investors

Automatic updates, page-by-page analytics, restricting downloads, device limits and NDA gating start on the Business plan, and dynamic watermarking is on Teams.

Types of Due Diligence

Due diligence splits into workstreams, usually run by different specialists. Here are the main types and what each one covers:

Buy-Side vs Sell-Side Due Diligence

Buy-side due diligence is the buyer's or investor's review of the company. Sell-side due diligence (in M&A, sometimes called vendor due diligence) is the seller's own review before going to market, so problems surface before a buyer finds them. PwC says it gives sellers "greater control over the sale process and the timing of sale."

Sell-Side Checklist (Company Raising Funds or Selling)

1. Name one owner: one person runs the data room and answers requests, with help from finance, legal and HR.
2. Review yourself first: check your own financials, contracts and IP for gaps before buyers do, and fix what you can.
3. Gather the documents: work through the document checklist, starting with three years of financial statements and tax returns.
4. Structure the data room: use numbered folders, one per document group, so reviewers find things fast.
5. Control access: gate the room behind an NDA, keep documents view-only, and give each group of stakeholders its own data room.
6. Stage sensitive material: hold back customer names, pricing and employee personal data until later rounds, or share them in a separate room with stricter terms.
7. Keep documents current: sync the room with your source folders so reviewers always see the latest version.
8. Track engagement: see who opened what, and follow up with the most engaged parties.
9. Log questions and answers: keep one record so every party gets the same information.
10. Hand over at closing: once the deal closes, turn downloads back on so the buyer can download the data room, or transfer the files another way.

Buy-Side Checklist (Investor or Acquirer)

1. Set the scope: decide which workstreams you need (financial, legal, commercial, technical, HR, tax) and what size of issue matters.
2. Send a request list: ask the seller for documents by category, using the document checklist. The seller adds them to the data room.
3. Check the numbers: reconcile financial statements, tax returns, debt and working capital with what you were told.
4. Read the material contracts: look for change-of-control clauses, exclusivity and termination rights.
5. Confirm IP ownership: make sure employees and contractors have assigned their work to the company.
6. Look for liabilities: litigation, regulatory issues, tax exposures and compliance gaps.
7. Assess the team: key people, compensation and retention risk.
8. Test the growth story: customer concentration, churn and the sales pipeline.
9. Log risks as you go: track open questions, and feed what you find into the price and the purchase agreement.

AI in Due Diligence

Artificial intelligence is increasingly being used to accelerate the due diligence process. In a 2025 McKinsey survey of 200 participants, 40% of those using gen AI in M&A said it shortened deal cycles by 30 to 50% on average. AI-powered tools can automatically review large volumes of documents, identify anomalies, flag risks, and even summarize key insights for investors and legal teams. This significantly reduces the manual workload involved in reviewing contracts, financial statements, and compliance records.

However, while AI can enhance speed and efficiency, it does not replace the need for a well-structured data room. Clean organization, complete documentation, and secure access control remain critical. In fact, AI tools perform best when data is already centralized and structured properly within a virtual data room.

Before you upload deal documents to an AI tool, check how it stores and uses your data, and whether your NDA allows sharing with it. The NIST AI Risk Management Framework, a voluntary framework released in January 2023, is a practical starting point for those questions.

As a result, companies that combine AI-driven analysis with a secure document sharing platform are better positioned to complete due diligence faster and with greater confidence.

FAQ

What is included in a due diligence data room?

A due diligence data room includes financial, legal, HR, operational, IP, and compliance documents required to evaluate a business before a transaction.

How do you organize a due diligence data room?

Use a clear folder structure with categories like financials, legal, HR, and operations, ideally numbered for easy navigation.

What is the purpose of a virtual data room in due diligence?

To securely share sensitive documents while tracking access and maintaining control over who views them.

Who has access to a due diligence data room?

Typically investors, buyers, legal advisors, and auditors, with permissions controlled by the data room admin.

How long does due diligence take?

It can take anywhere from a few weeks to several months depending on deal complexity and document readiness. Software Equity Group, an M&A advisor for software companies, says diligence on its deals usually takes 30 to 45 days, though many deals take 90 days or more to close. It breaks the process into four stages:

1. Kickoff and document exchange
2. Follow-up questions and deep dives
3. Legal back-and-forth and negotiation
4. Customer calls and final steps

Sellers can shorten it by having most of the data room ready before the first request arrives.

What is the difference between buy-side and sell-side due diligence?

Buy-side due diligence is the buyer's or investor's review of the company. Sell-side due diligence is the seller's own review before the sale, so issues surface early and the seller keeps more control of the timeline.

Start your 14-day free trial of Orangedox Virtual Data Rooms and see what Orangedox can do for your business, or you can book a free 1-1 demo today.