Before a shareholders agreement is signed, the question is not only who appears on the register. The question is who controls the company and what a new shareholder can actually enforce. In Luxembourg, those two questions do not always have the same answer. The registered layer — directors, capital, filed documents — is accessible and largely free. The control layer requires cross-referencing that registered data with filed financial statements, group structure disclosures, and, where available, beneficial ownership records.
The ceiling of what the sources allow is stated before payment. That ceiling is fixed by Luxembourg law and by what the RCS/LBR discloses. It does not move with the size of the engagement.
What the Luxembourg company register discloses
The Registre de Commerce et des Sociétés (RCS), administered by the Luxembourg Business Registers (LBR), is the primary official source for Luxembourg entities. Most PDF documents — incorporation acts, amendments, annual accounts where filed — are available without charge through the LBR portal.
The register discloses:
- Legal name, registration number, legal form, and registered office
- Directors, managers, and authorised signatories with appointment and cessation dates
- Share capital as stated in the articles or most recent amendment
- Filed amendments to the articles of association
- Annual accounts, where the entity is required to file and has done so
The register does not disclose the identity of shareholders in real time for all legal forms. For a société à responsabilité limitée (Sàrl), the articles and their amendments record the shareholder list at the time of each notarial act. Changes between acts may not appear until the next filed document. For a société anonyme (SA), bearer shares were abolished; registered shares are recorded in the company's own register, which is not publicly accessible through the LBR.
Source: RCS/LBR · extracted 2026-03-20
Control: what the registered layer does and does not establish
The registered layer establishes formal authority — who is authorised to bind the company, what the stated capital is, and what the articles say about governance. It does not establish economic control.
Economic control in Luxembourg structures is frequently held through:
- Holding companies registered in other jurisdictions, whose own ownership is not visible in the LBR
- Shareholder agreements that are not filed with the register and carry no public disclosure obligation
- Voting arrangements, drag-along and tag-along rights, and veto provisions that exist only in private documents
A counterparty report maps the registered layer precisely and identifies where the chain stops. It names the stopping point — the level at which no further public disclosure exists — and states the reason.
Beneficial ownership: the RBE layer
Luxembourg operates the Registre des Bénéficiaires Effectifs (RBE) under the 2019 law implementing the Fourth Anti-Money Laundering Directive. Following the CJEU judgment in joined cases C-37/20 and C-601/20, public access to beneficial ownership registers across EU member states was suspended or restricted. Luxembourg implemented access restrictions accordingly.
Access to RBE data for a specific entity requires a demonstrated legitimate interest. The conditions for establishing that interest, and the procedure for submitting a request, are set by the Luxembourg Business Registers. The outcome of a request is not guaranteed and the timeline depends on the LBR's processing.
A counterparty report at the Standard or Extended tier includes the RBE access step where the legitimate interest threshold can be met. The report states clearly whether RBE data was obtained, partially obtained, or not obtained — and why.
Source: RBE/LBR · extracted 2026-03-20
Timeline and what drives it
The timeline for a Luxembourg counterparty report depends on three variables: the legal form of the entity, the depth of the group structure above the Luxembourg level, and whether the RBE access step is included.
Signal tier reports — registered layer only — are typically delivered within three business days. Standard tier reports, including the RBE step and financial statement review, typically require five to seven business days. Extended tier reports, which follow the group structure into foreign registries, depend on the jurisdictions involved and are scoped individually.
The limit of what the sources allow
The RCS/LBR is a reliable and largely complete source for the registered layer of a Luxembourg entity. It does not show what is not filed. Shareholder agreements, side letters, and economic arrangements between shareholders carry no filing obligation in Luxembourg and do not appear in any public source.
For SA structures, the current shareholder list is held in the company's own register. That register is not publicly accessible. The report establishes the stated capital and the last known shareholder position from notarial acts, and names the gap.
For holding structures above the Luxembourg level, the report follows the chain into the relevant foreign registries. Each foreign registry has its own disclosure rules. The report states, for each link in the chain, what was established and what was not — and from which source.
The RBE layer adds beneficial ownership data where access is granted. Where access is not granted, the report states that the request was made, the outcome, and what remains unverified.
No report in this jurisdiction — or any other — establishes what has not been filed and what no public source holds. The value of the report is in mapping the registered layer completely, identifying every gap, and stating the reason for each gap before the shareholders agreement is signed.