A:
If it is the case that the capital is invested in one project amounting to an established company most of whose assets are present, it is (Part No. 14; Page No. 330) permissible for a person having shares therein to sell it provided that the sold item is known. However, he may not sell it unless he seeks the permission of his partners. This is based on the general purport of the statement of the Prophet (peace be upon him):
It's not permissible for a partner to sell anything without the permission of the other partner.
(Related by
Muslim).
Moreover, some partners may raise objections which may cause harm to other partners. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.