The riskiest types of investments typically include highly speculative, unverified financial instruments such as leveraged cryptocurrency derivatives, penny stocks of pre-revenue micro-cap companies, heavily shorted meme stocks, and unregulated digital tokens. These assets feature extreme price volatility, complete lack of underlying fundamental value or regulatory protection, low liquidity, and a high probability of total capital loss. Financial experts advise that aggressive risk capital should only comprise a tiny fraction of a well-diversified portfolio.