The phrase "substantial risk of loss" means that there is a significant likelihood or probability of losing something important or valuable. Full definition
Futures and options trading involves substantial risk of loss and may not be suitable for everyone. (futuresmag.com)
Trading futures and options involves substantial risk of loss no matter who is managing your money and is not suitable for all investors. (trendfollowingmentor.com)
Futures and options trading involves substantial risk of loss and is not suitable for all investors. (optimusfutures.com)