Ruling on buying halaal shares through riba-based banks
Question

                What is the ruling on buying a halal company’s stocks with a condition that these must be bought through banks only?.
Praise be to Allah.
    It is permissible to buy shares in permissible companies via 
    the banks, and what the riba-based banks charge from the purchaser or 
    company is only in return for serving as an intermediary, and it is a fee 
    that is permissible for them, because it is in return for permissible work. 

    Shaykh al-‘Uthaymeen (may Allaah have mercy on him) said: 

    There is nothing wrong with dealing with the banks in 
    permissible transactions, for example, I may buy from them, or get change 
    from them, or transfer money through them – there is nothing wrong with 
    that. Rather what is forbidden is riba. If it is not riba there is nothing 
    wrong with it. It was proven that the Prophet  (peace and blessings of 
    Allaah be upon him) bought from the Jews, and accepted gifts from them, 
    although they consumed haraam wealth and took riba, and when he  (peace 
    and blessings of Allaah be upon him) died, his shield was being held in 
    pledge by a Jew. 

    Liqaa’aat al-Baab il-Maftoohah 
    (70/question no. 7) 

    And Allaah knows best.