Motley Fool analyst Andrew Tonner answers the question: What is a 10-K?

A 10-K is a financial document that all public companies file with the SEC each year. It's chock-full of investor must-haves, including financial statements and management discussion and analysis. It also includes the notes to financial statements, which are valuable for assessing a company's risk factors.

These are hefty documents. Apple's most recent 10-K was 20 pages long, while Google's was 18. It's worth taking the time to patiently sit down and read them carefully, though, because that's where great investments are found.

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Andrew Tonner owns shares of Apple. The Motley Fool owns shares of Apple and Google. Motley Fool newsletter services recommend Apple and Google. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.