How to Use SEC Filings to Evaluate a Stock Before Buying

Start with the Most Recent 10-K

The annual 10-K is the foundation of any serious stock research effort. Read it in this order: first, the Business section (Item 1) to understand what the company actually does and how it makes money; second, the Risk Factors (Item 1A) to understand what could go wrong; third, the MD&A (Item 7) to hear management's interpretation of the financial results; and finally, the Financial Statements (Item 8) to verify the numbers behind the narrative.

Pull Five Years of Revenue and Margin Data

A single year's results tell you little. Build a five-year table of revenue, gross margin, operating margin, net margin, and free cash flow. Is the business growing consistently? Are margins expanding or compressing? Is earnings quality high (free cash flow close to reported net income) or low (large divergence between earnings and cash)?

Read the Last Three 8-Ks

The three most recent 8-K filings give you a quick window into material events — management changes, acquisitions, contract wins, and earnings results. They bridge the gap between annual reports and help you understand what has happened recently that may not yet be reflected in the 10-K.

Check Insider Activity

Form 4 filings show what executives and directors are doing with their own money. Recent open market purchases (code P) are a positive signal. Heavy selling by multiple insiders simultaneously warrants investigation — though selling alone, without context, is inconclusive.

Assess the Balance Sheet

Review current vs. long-term debt, cash balance, and recent trend in shareholders' equity. Is the company self-funding or dependent on external financing? Is debt growing at a sustainable pace? Are there large contingent liabilities in the footnotes that could materialize?