What is the ruling on the profit resulting from the sale of shares that were originally permissible but later became impermissible, and their owner only found out after some time? Is it permissible to give this profit to one's wife or sister?

Ruling on the shares of a specific company requires examining its dealings and financial statements. If the company's activity is forbidden, then only the impermissible portion of the profits must be disposed of, whether it is operating profit or profit resulting from buying and selling. It is permissible to give the impermissible portion to one's sister or her husband if they are poor, but it is not permissible if they are wealthy.