In commercial engineering firms a majority of shareholders have to be licensed engineers. Authorised engineers are required to have a citizenship of an EU/EEA country or Switzerland.
"§ 1 Subject matter
(1) This law regulates
a) the conditions governing access to the occupations of architect, landscape architect and civil engineer by exercising the right of establishment, [...]
(2) Unless otherwise provided by this Act, the rules and procedures referred to in paragraph 1 shall apply to nationals of the Member States. For the purposes of this Act, a Member State shall mean a Member State of the European Union, a State party to the Agreement on the European Economic Area and the Swiss Confederation.
[...]
§ 2 Authorization
Authorization is a decision according to the third part on the registration of the applicant in the list according to § 3 par. 1, 2 or 3 (hereinafter "the list") on the basis of
a) obtaining a professional qualification under this Act, or
b) recognition of professional qualifications obtained in the home Member State.
§ 3 Basic provisions
(1) An authorized architect (hereinafter referred to as the "architect") is one who is registered in the list of authorized architects.
[...]
§ 9
(1) An architect or engineer may provide services alone or in conjunction with other architects or engineers. Architects or engineers may set up a business for the exercise of their profession if they are the majority shareholders in it.
[...]
§ 15 Listing
(1) The chamber shall enter the list on the basis of authorization
a) according to § 2 letter (a) who proves that:
1. is a national of a Member State and has full legal capacity, [...]
b) according to § 2 letter (b) who proves that
1. is a national of a Member State [...]" (Act on Authorized Architects and Authorized Civil Engineers (138/1992 Coll.), consolidated version effective from 01.11.2013 to 31.12.2015, §§ 1, 2, 3, 9 and 15 [google translation])
Act on Authorized Architects and Authorized Civil Engineers (138/1992 Coll.), consolidated version effective from 01.11.2013 to 31.12.2015, §§ 1, 2, 3, 9 and 15
[<a href="https://www.slov-lex.sk/pravne-predpisy/SK/ZZ/1992/138/20131101.html">Act</a>]