Is it permissible to subscribe to a trading company that does not guarantee capital and promises a 300% profit margin after 16 months, in addition to registration fees and a 7% commission for each new subscriber, and gives a portion of its annual profits?

The mere existence of registration and deposit fees is impermissible. If this is combined with pyramid or network marketing and profiting from subscribers through you, the matter becomes even more forbidden, regardless of the investment field itself, which must be permissible in its own right. This does not include investment companies operating through Forex and currency trading without their Sharia-compliant controls.