Penny stocks can be portfolio game changers even with a 10% to 15% allocation. The reason is that 5x or 10x returns in relatively quick time is not an unrealistic expectation. Of course, the ideas need to be well researched and the bullish thesis must be backed by fundamentals rather than being purely speculative. Around this time last year, Riot Platforms (NASDAQ:RIOT) stock was trading at $4.2. RIOT stock is already higher by 250% from those levels. Similarly, Archer Aviation (NYSE:ACHR) stock has surged ...