This document provides an overview of the types of company information available depending on whether a company is private, non-profit, or publicly traded. It focuses on the extensive information publicly traded companies must disclose through required Securities and Exchange Commission (SEC) filings like the 10-K, 10-Q, and 8-K. These filings contain detailed information about a company's business operations, financial position, risks, and legal proceedings that investors use to analyze the company. The document describes how to find these filings on the SEC Edgar database or company websites and provides examples of additional sources like company profiles and stock reports that can help interpret the SEC filings.