Due Diligence Checklist—What documents should you prepare before starting the process?

The due diligence process is the moment of truth for any company planning a sale, seeking an investor, or pursuing a merger. It is at this stage that the other party to the transaction-the buyer, investment fund, or bank-analyzes whether what it sees on paper actually corresponds to the business reality. Well-prepared documentation not only speeds up the process but also has a real impact on the valuation and the seller’s negotiating position.

Below is a checklist of the most important documents you should have ready before the formal due diligence phase begins.

Corporate documents

These form the foundation of any due diligence process—the other party must be certain of who actually owns the company and how it is organized:

• articles of incorporation or articles of association, including all current amendments,

• an extract from the National Court Register (KRS) and the history of entries,

• ownership structure and capital table: who holds shares and in what proportions,

• resolutions of the company’s governing bodies (management board, shareholders’ meeting, supervisory board),

• list of powers of attorney and persons authorized to represent the company.

Financial documents

Buyers and investors always begin their analysis with the numbers—these largely determine the valuation:

• financial statements for the last 3–5 years, preferably audited,

• current balance sheets and income statements,

• financial forecasts and budgets,

• off-balance-sheet liabilities, guarantees, and sureties,

• information on debt, loans, and leases.

Legal and Contractual documents

This area often determines whether a transaction will go through at all—undisclosed legal risks are often the most common reason for price adjustments or the breakdown of negotiations:

• agreements with key customers and suppliers,

• rental and lease agreements and other long-term obligations,

• a record of pending and concluded litigation and administrative proceedings,

• regulatory decisions, concessions, and permits,

• insurance policies.

Employee documents (HR)

An area that is often underestimated but poses a real risk—especially in share deal transactions, where the buyer acquires the company along with its entire HR infrastructure:

• employment contracts for key employees and management,

• internal policies (regarding work, compensation, and the Company Social Benefits Fund),

• information on salaries, bonuses, and incentive programs,

• any labor disputes or claims by former employees.

Intellectual property

Especially in technology and product companies, IP is often one of the most valuable and hardest-to-verify assets:

• registrations of trademarks, patents, and industrial designs,

• uagreements for the transfer of copyrights (assignments) from employees and subcontractors,

• licenses for software and technologies used by the company,

• web domains and the rights to them.

Regulatory compliance (Compliance and GDPR)

Increasingly, this is the area that raises the most questions from investors, especially in the context of personal data processing and cybersecurity:

• a record of personal data processing activities (GDPR),

• signed data processing agreements,

• documentation regarding security incidents, if any,

• internal policies regarding information security.

How should you organize your documentation to ensure the process runs smoothly?

The list of documents alone is only half the battle. Equally important is how they are made available to the other party. In practice, the following approach works best:

• organizing documents into a clear, logical folder structure that reflects the categories listed above,

• granting precise access permissions—not every participant in the process should have access to everything,

• maintaining a central Q&A log in one place, rather than scattered email threads,

• securing the most sensitive information (e.g., clients’ financial data) to be shared at a later stage of the process.

The role of a Virtual Data Room (VDR)

A virtual data room, such as SECUDO, is designed specifically for this stage of the transaction. It allows you to organize all documentation in a single, secure location, grant precise access permissions to individual participants in the process, and track which documents generate the most interest from the other party.

Summary

A well-prepared due diligence checklist is not a mere formality, but a practical tool for building a negotiating advantage. A company that can respond instantly to an investor’s questions and provide complete, organized documentation sends a clear signal: it has control over its business. This trust directly translates into the pace of the transaction and the final terms of the agreement. About Us

DealDone is a specialized company offering high-quality products in the field of information and data security. We provide digitization services and software for modern technologies related to the handling of confidential information, classified information, and sensitive data, as well as the digitization, protection, encryption, and sharing of data and documents both within and outside an organization.

For over 15 years, DealDone has specialized in providing solutions for the digitization, archiving, and sharing of documents via a Document Management System (DMS) or Virtual Data Room (VDR).

DealDone independently developed and launched the SECUDO VDR system. SECUDO is a cloud-based platform for the secure digitization, archiving, exchange, and processing of corporate documents and data, offered to business clients under a Software-as-a-Service (SaaS) model.

DealDone also owns the websites www.platformainwestora.pl and www.sprzedamfirme.com, through which it supports transactional processes related to company sales, raising capital, and finding investors for projects.