CIK number (Central Index Key)

A CIK number is a unique identification code assigned by the SEC (Securities and Exchange Commission) to every company that files financial documents with them. Think of it as a fingerprint for public companies—it's how the SEC keeps track of who's who in the filing system. You'll encounter CIK numbers when digging through SEC filings like 10-Ks (annual reports) or 10-Qs (quarterly reports), which is where companies disclose their financial health and business details. It matters because it's the fastest way to find a specific company's official filings without getting lost in thousands of documents. For example, if you're researching TechCorp Inc., you'd search for their CIK number on the SEC website to pull up all their filings in one place.