Praise be to Allah.
If the company sells permissible products, and does not take riba-based loans , and does not deposit its money in riba-based accounts, then there is nothing wrong with buying their shares and benefiting from this incentive.
It says in a statement of the Islamic Fiqh Council belonging to the Muslim World League that was issued during its fourteenth session in 1415 AH/1995 CE:
- Given that the basic principle regarding transactions is that they are permissible, establishing a joint-stock company whose purposes and activities are permissible is something that is allowed according to Islamic teachings.
- There is no difference of scholarly opinion concerning the prohibition on shares in companies whose basic purpose is prohibited, such as dealing in riba, or manufacturing or trading in things that are prohibited.
- It is not permissible for the Muslim to buy shares in companies and banks , if some of their transactions involve riba or manufacturing or trading in things that are prohibited.”
It is not clear what the reason is for what you have mentioned about there being interest of less than 1%. Perhaps it comes from putting their money in a current account – as is the case in some banks. Whatever the case, it seems that this company cannot be described as depositing its money in a riba-based account. But you should get rid of this percentage, because gifts in return for a current account are haram.
And Allah knows best.