Material weakness

A material weakness is a serious flaw in a company's internal controls—the systems and procedures it uses to keep its financial records accurate and honest. You'll see this term in SEC filings (official documents companies file with regulators), and it matters because it's a red flag that the company's financial statements might contain errors or even fraud. Think of it like discovering your accountant has no organized filing system and nobody's checking their work—you can't trust the numbers. When auditors find a material weakness, they have to disclose it publicly, which often makes investors nervous. It's different from a minor control problem; "material" means it's serious enough to actually affect what investors should know about the company's finances.