In some trading strategies, it may happen that the exact purchase price is unknown to the buyer or the seller.
Example : If you use a trailing stop, or buy at the market…
We know that in Islam, knowing the price is important.
But the broker knows the price, it’s probably a robot but does that settle the matter?
May Allah bless you.
A trailing stop order involves determining whether it will be based on a percentage or a fixed-dollar amount, as well as the extent to which it will trail or follow the price.
There is no gharar involved as such, as you have given your consent to the broker to act on your behalf with specific instructions. However this must be provided that the structure of the transactions follow other shariah principles too.
And Allah knows best!