10-K
Form 10-K includes almost everything about the business that a potential investor would want to know including: a corporate overview, risk factors, financial statements, accounting policies and practices, changes in management, legal proceedings, directors, executive officers, current operations, future plans, and more. Often you may find market segment or market share information, key brands, etc. The annual report often sent to shareholders often differs from the 10-K, but some companies publish the annual report and the 10-K as one document.