When an investment loses money, the question is not whether the market moved. It is whether someone did something they were not permitted to do. This article explains how investment loss claims are actually built and recovered: the duties a broker or adviser owes, the difference between a bad outcome and a legal violation, and the forum where nearly every customer dispute is decided. It covers suitability and best interest standards, unauthorized trading, excessive trading, misrepresentation, failure to supervise, and selling away. It explains the private securities fraud claim — its elements, its heightened pleading requirements, and the presumption of reliance that makes class treatment possible. It covers registration, exemptions, and why unregistered offerings produce so many claims. It closes with what to do the week a statement looks wrong.