A:
It is permissible for a person to buy shares in these companies if they do not deal in Riba (usury/interest). There is no harm in selling, keeping and investing in them. It is impermissible to sell the shares of the heirs without their permission except if they are minors and the guardian sees that they may benefit from selling the shares. May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions!