A law firm, under the Greek Law, is a civil association between practicing Lawyers and its supreme body/institution is the "General Meeting of Partners". All partners of the "General Meeting" must fulfil the Greek/EU/EEA citizenship requirement for obtaining a license to practice Law in Greece.
"Article 6 - Legal requirements - Barriers
The lawyer must:
1 . Be a Greek citizen or a citizen of a member state of the European Union or of another state, which is a party to the Convention on the European Economic Area. A Greek can be appointed a lawyer with the permission of the Minister of Justice, which is issued after the opinion of the relevant bar association.
[...]
Article 49 - Establishment of a Law Firm - Headquarters Branches - Legal entity Company name
1 . A Civil Law Firm (hereinafter referred to as the "Law Firm" or the "Company") may be established only between practicing lawyers (hereinafter referred to as the "Partners") for the sole purpose of providing legal services (anywhere, inside or outside Greece) and the distribution exclusively between the Partners (according to the method, which they will agree at their non-binding judgment) of the total profits, which will result from the activity of the company.
[...]
Article 52 - Contributions - Corporate Property - Corporate Shares
1 . The Partners obligatorily contribute their work to the Company. In addition, the contribution of money or movables and the use of movable and immovable things is allowed exclusively for the service of the needs of the Company. It is also allowed the acquisition of property ownership by the Company for its professional installation only. The valuation of the contributions, as well as any omissions and refunds of any amounts to the Partners, due to departure or for any other reason, are decided by the Partners of the Law Firm.
2 . The contributions of the Partners and everything else, acquired in any way in the name or on behalf of the Company, belong to the Company.
3 . The shares of each Partner are set freely by the General Meeting in percentages and are not linked to the Partner's contribution.
4 . By a decision of the General Meeting taken in accordance with the provisions of the Articles of Association with the required quorum and majority, the shares are redistributed either with the entry or departure of a Partner or with its expulsion for a good reason, or for any other reason. Unless otherwise specified in the Articles of Association, a decision of the Partners representing 3/4 of the shares is required. The change of the shares for any reason constitutes an amendment of the Articles of Association.
5 . By decision of the General Meeting of Partners it may be provided that fees from participation in Boards of Directors or from a paid mandate can be collected by the Partner directly if this collection is not made by the Company but individually by the Partner.[...]" (Lawyers' Code (4194/2013), subsequetly amended, Articles 6, 49 and 52 [google translation based on unofficial text at kodiko.gr])
Lawyers' Code (4194/2013), subsequently amended, Articles 6, 49 and 52
[<a href="http://www.et.gr/idocs-nph/search/pdfViewerForm.html?args=5C7QrtC22wEaosRGzKxO6XdtvSoClrL8A9d-yAUcKEJ5MXD0LzQTLWPU9yLzB8V68knBzLCmTXKaO6fpVZ6Lx9hLslJUqeiQZo6QYW-uV-ENHV699Y3tkm_Vc8nmsGuL9nO7gKwnjWc.">Code (official)</a>],[<a href="https://www.kodiko.gr/nomothesia/document/76222">Code (unofficial)</a>]