Is investment in the US stock market permissible? The assumption is that we avoid stocks of companies that are involved in haram activities such as gambling, alcoholic drinks, etc.
Investment in the US stock market is permissible as long as you are knowingly investing in a company that does not participate in forbidden (haram) activities. In the case of a mutual fund that may contain a company that participates in forbidden activities, you must take out an amount of your investment profits that is equal to the ratio of the companies that participate in forbidden activities (from the whole of the companies in the mutual funds) and donate it to charity (sadaqah).