The société anonyme (SA) is Luxembourg’s public limited company. It is the form of choice for larger businesses, regulated activities and groups that want to move shares between investors easily. A shelf SA is one that has already been incorporated and registered but has not traded, so you can take it over instead of waiting for a new incorporation.
An SA works differently from an S.à r.l. in how shares are transferred, how the company is managed and how its capital is paid. This article covers those differences and walks through the takeover. For the basics of every company type, see our guide to company types in Luxembourg. For the private limited company equivalents, see our articles on the shelf S.à r.l. and the shelf SARL-S.
What you are buying
You buy all of the SA’s shares. The company keeps its Luxembourg Trade and Companies Register (RCS) number, its incorporation date and its articles of association. What changes is who owns it, who runs it and, if you wish, its name and address. As with any genuine shelf company, there are no assets, contracts or liabilities to take over.
Why an SA instead of an S.à r.l.?
- Shares move more easily. SA shares are freely transferable by default, unless the articles restrict transfers. There is no three-quarters shareholder approval as there is for an S.à r.l.
- No cap on shareholders. An S.à r.l. is limited to 100 shareholders. An SA is not, which suits investor structures.
- Flexible governance. An SA can have a board of directors or a two-tier structure, set in the articles.
- A form that investors and regulators know. Some regulated activities and larger structures expect an SA.
The trade-offs are a higher minimum capital of €30,000 and a more formal management structure. If neither of those benefits applies to you, a standard S.à r.l. is usually simpler.
How an SA is managed
This is where buyers need to decide before the transfer.
Single-tier board (the default). The company has a board of directors. With more than one shareholder, there must be at least three directors. If the SA has a single shareholder, one director is enough. Directors can be natural persons or companies; a company director must name a permanent representative.
Two-tier structure. The articles can instead provide for a management board of one to five members and a supervisory board of at least three. The two bodies cannot overlap.
Appointing and removing directors. The general meeting appoints directors for a term of up to six years, and can remove a director at any time. As the new sole shareholder you make these decisions yourself.
If you plan to bring in investors later, think about whether the existing board structure fits. The articles can be amended after the transfer.
The capital of a shelf SA
An SA needs at least €30,000 of subscribed share capital, of which at least 25% must be paid up on incorporation. The unpaid balance is called by the board within the period set in the articles.
When you buy a shelf SA, find out what has been paid and what has not. Unpaid capital is still owed to the company, and you will inherit the obligation as the new shareholder. Settle this in the transfer agreement. Our due diligence checklist explains how to verify it.
The 2026 law that allows deferred payment of minimum capital applies to the S.à r.l. It does not change the capital rules for an SA.
From signing to ownership: the steps
- Confirm the shares and the register. Check how the shares are held (registered or dematerialised) and that the share register is complete and consistent with the RCS.
- Provide your documents. Identity and beneficial owner details. See the documents needed.
- Sign the share transfer. For registered shares, the transfer is recorded in the shareholders’ register and notified in writing to the company. Where the articles restrict transfers, any approval they require is recorded too.
- Change the board. The old directors resign or are removed, and the general meeting appoints yours. The change is filed with the RCS.
- Update the registered details. A new registered address or domiciliation is updated at this stage.
- Change the name or corporate purpose, if you want to. This requires amending the articles before a notary, followed by an update of the register.
- Beneficial owner register (RBE). The new ownership must be filed with the RBE within one month. Failing to file or update can lead to fines between €1,250 and €1,250,000.
- Auditor, bank and accounting. Confirm the SA’s audit or supervision arrangements, and set up your bank account and accountant. See bank accounts.
Once the documents are complete, the share transfer itself usually takes only a few business days. The notary step, the RBE filing and the bank account follow their own timelines.
Ongoing obligations
An SA has more governance obligations than an S.à r.l. Besides accounts and tax returns, it needs an annual general meeting, and depending on its size and shareholders it must appoint an external auditor or supervisor. A larger SA must appoint a statutory auditor (réviseur d’entreprises agréé). Smaller SAs with several shareholders generally appoint a commissaire aux comptes for a lighter review. Budget for this when you compare forms. See what it costs to run a Luxembourg company.
SA or S.à r.l.?
| Question | SA | S.à r.l. |
|---|---|---|
| Minimum capital | €30,000, at least 25% paid up | €12,000 |
| Transferring shares | Free by default, unless the articles restrict it | Needs approval of shareholders representing three quarters of the capital |
| Number of shareholders | No limit | Up to 100 |
| Management | Board of directors (at least three with several shareholders) or two-tier | One or more managers |
| Audit or supervision | Statutory auditor, or a commissaire aux comptes for smaller companies with several shareholders | Depends on size |
| Best for | Larger businesses, regulated activities, investor structures | Operating, holding, IP and finance companies |
Four mistakes to avoid
- Ignoring unpaid capital. Find out the paid-up amount before you buy.
- Appointing one director when you will have several shareholders. The board needs at least three directors once there is more than one shareholder.
- Forgetting the audit side. Check whether your SA needs an auditor or a commissaire, and plan for the cost.
- Missing the RBE deadline. The one-month period starts when ownership changes.
Frequently asked questions
Can I buy a shelf SA if I do not live in Luxembourg?
Yes. Non-residents commonly do. You provide identification and beneficial owner details, and you need a Luxembourg registered address, which a domiciliation service can provide.
Do I need a notary to buy a shelf SA?
The share transfer itself is recorded in the share register. A notary is needed for changes to the articles, such as a new name or corporate purpose.
Can a company own an SA?
Yes. Unlike a SARL-S, an SA can be held by individuals or companies.
Can I have one director?
Only if the SA has a single shareholder. With more than one shareholder, the board needs at least three directors.
Does the SA keep its age and RCS number?
Yes. Only the owner, the directors and any details you choose to change are updated.
Is an SA better than an S.à r.l.?
It depends on your plans. An SA suits investor structures and regulated activities. A standard S.à r.l. is simpler and cheaper to run. See our comparison of a shelf company and a new company.
Next step
We can supply a shelf SA. Tell us who will own the company and what it will do, and we will confirm whether an SA or an S.à r.l. is the better choice, and send you a summary of the requirements and a timetable. See how to buy a Luxembourg shelf company or contact us.
This article is for general information only and is not legal, tax or financial advice. Rules change, so confirm the details with a qualified professional before making decisions.