“投资风险”常见的英文表达是 investment risk。
例如：
Before making any investment, you should carefully assess the investment risk.（在进行任何投资之前，你都应该仔细评估投资风险。）
Investors need to be aware of the various investment risks associated with different financial products.（投资者需要了解与不同金融产品相关的各种投资风险 。）