Yes - and the qualification has nothing to do with owning the company. A single-member company can hold 100% of a Polish limited liability company (sp. z o.o.) without difficulty; owning is never the problem. What Polish law restricts is narrower and comes earlier: who may incorporate a new sp. z o.o. as its only founder. So the honest version of the question is not “can it own” but “can it found” - and there the answer needs one line of care.

What Polish law actually restricts

A sp. z o.o. “may not be founded solely by another single-member limited liability company” (Art. 151 § 2 of the Commercial Companies Code (Kodeks spółek handlowych, “KSH”)). The bar is cumulative: it applies only where the founder is a sp. z o.o., is itself single-member, and is the only founder. Remove any one of the three - a second founder, a founder that is not single-member, or a founder that is not a sp. z o.o. - and the obstacle is gone.

For precision: The rule names the single-member sp. z o.o. and nothing else. A single individual may found a sp. z o.o. alone, and so may a single-member joint-stock company (S.A.) or simple joint-stock company (PSA) - the identical bar for founding an S.A. or a PSA (Art. 301 § 1 and Art. 300¹ § 2 KSH) is, in each case, aimed only at a single-member sp. z o.o. as sole founder.

Does it catch a foreign holding company?

This is where the tidy answer runs out. The prevailing view reads the bar as reaching a foreign single-member company that is the equivalent of a sp. z o.o. - the rule exists to prevent chains of one-owner companies, and a foreign vehicle would otherwise defeat that purpose. But there is no single, settled rule, and registry practice is not uniform. The realistic exposure is not that the company turns out to be invalid; it is that the registry court may pause over the point when the company is filed for registration.

The structure that most often runs into this is a common one: a US group holds its European operations through a single-member Dutch holding company, and it is that holding company that is to incorporate the Polish entity. The registration risk is small - but I will not incorporate on that footing without flagging it, and once I do, clients almost always choose a different route. They are not weighing whether the court will ultimately register the company; they simply will not carry even a modest risk of having to unwind and restart a process already reported up the group as “about to complete”.

Why it stops mattering once you are registered

The restriction attaches to founding the company and to nothing that follows. A single-member company may acquire all the shares in an existing Polish company without any such limit (Art. 180 KSH). That single fact turns the whole question into a formation-stage formality rather than a structural constraint - and it is what makes the two standard routes work.

The route clients most often take is to buy a ready-made company and transfer the shares to the intended shareholder. Where the company is instead formed from scratch, I have on a few occasions had a second group entity take up a single share at incorporation and then, immediately after registration, transferred that one share to the entity always intended as the sole shareholder - a second founder that existed only for the moment of registration, after which we returned to the target structure.

What this means for you

If the entity that is to hold your Polish company is a single-member sp. z o.o. - or, on the prevailing view, its foreign single-member equivalent - do not incorporate with it as the only founder. Buy a ready-made company and transfer the shares, or add a second group entity as founder for a single share and move it out immediately after registration. Above all, settle this while the structure is still on the drawing board: the costly version of this problem is the one discovered after “registration is imminent” has already gone up the chain. Once the company is registered, consolidate to your single-shareholder target with a clear conscience.

Watch out

  • The one moment this bites is incorporation and the registry filing. Found the company correctly and there is nothing left to manage afterwards.
  • The bar concerns a single-member sp. z o.o. as sole founder. A single natural person may found a sp. z o.o. alone, and so may a single-member S.A. or PSA - none of those is caught.