Being a shareholder of a company does not directly affect professional responsibility as a controller. As a controller, your primary responsibility is to ensure that the company's financial records are accurate and complete, and to provide timely and relevant financial information to management and stakeholders.
However, it is important to note that as a shareholder, you may have a financial interest in the company's performance, and this may create conflicts of interest that could potentially affect your objectivity and professional judgment. As a controller, it is important to be aware of these potential conflicts of interest and to ensure that your actions and decisions are always guided by your professional responsibilities and ethical obligations. In some cases, it may be necessary to disclose any conflicts of interest and take steps to mitigate them to ensure that your professional responsibilities are not compromised.