The basic principle is that it is permissible to hold shares in any company if it does not deal with haram things such as riba and so on. But if it does deal with haram things such as riba, then it is not permissible to hold shares in it.

How to deal with financial losses in Islam: 1- The one who is managing the investment must be honest and truthful in telling the people what really happened. 2- If there has been any carelessness of negligence on his part, then he must replace what was lost through his negligence, and he himself must bear the loss that resulted from his carelessness. 3- The owner of the capital must accept the will and decree of Allah and strive to reduce the loss and deal with its effects, and save whatever he can of his capital by all permissible means.

Murabahah transaction for one who issued instructions to buy is permissible on condition that the one who is instructed to make the purchase buys the item for himself and takes possession of it in a real sense before he sells it to the one who gave those instructions.