In principle, shareholders are free to pursue their own interests through their participation in a legal entity, in accordance with the principle of private autonomy under Swiss private law. Accordingly, they are also free to exercise their rights at shareholders' meetings (e.g., art. 689 para. 1 Swiss Code of Obligations), particularly when appointing the organs of the legal entity.
On the other hand, it is the bodies, in particular the board of directors, as well as third parties involved in the management of the company, must perform their duties with due care and act in good faith in the interests of the legal entity (e.g., art. 717 Swiss Code of Obligations). They must treat shareholders equally under the same conditions (e.g., art. 717 para. 2 Swiss Code of Obligations).
However, resolutions of the shareholders' meeting that violate the law or the articles of association may be challenged by the board of directors and any shareholder in court by bringing an action against the legal entity (e.g., art. 706 para. 1 Swiss Code of Obligations).
It is the legal entity that is liable for damage resulting from unlawful acts committed by a person authorised to manage or represent the company in the course of their business activities (e.g., art. 722 Swiss Code of Obligations).
The persons acting are also personally liable for their negligence (art. 55 para. 3 of the Swiss Civil Code). In this regard, reference should also be made to the comments in section 1 (last paragraph) above.
Who can be prosecuted as an organ of a legal entity is not determined solely on the basis of formal criteria, but also on whether the person in question has made decisions reserved to organs or has been responsible for the actual management of the company and, thus, has had a decisive influence on the formation of the company's will (so-called de facto organ; BGE 114 V 213, abstract and consideration 4e).
In conclusion, Swiss law provides a differentiated set of criminal and civil law intervention and liability instruments in the event of unlawful pursuit of personal interests by shareholders. The use of these instruments must be considered on a case-by-case basis – with regard to the respective instrument, the facts of the case, the parties involved and the legal consequences. It should be noted that the passive legitimacy of the instruments is generally not linked to the status as a shareholder, but rather to decisions of the legal entity and the actions (or omissions) of its organs and the persons acting on their behalf.