Is it permissible to buy shares in Alujain Company—after it has become impermissible or mixed—with the intention of lowering the purchase rate, then selling them to recover only the capital?

For dealing in shares to be permissible, two conditions must be met: The first is that the company's activity must be permissible, and the second is that the company does not engage in usury or forbidden transactions. Therefore, it is not permissible to purchase shares of companies that mix permissible and impermissible activities in their work, and the intention to compensate for losses does not make it permissible.