Is it permissible to sell owned shares at a price higher than the current purchase price and in installments, given that they can only be transferred by selling them?

It is permissible to sell permissible shares in installments, even if they remain in the seller's name, with the importance of documenting the sale. Dr. Muhammad Al-Osaimi advised against selling shares in this manner due to the potential for dispute, the lack of documentation for the sale, and the difficulty of transferring ownership to the buyer, who in this case should not sell the shares to others, but rather ask the seller to sell them in the market.