For a U.S. reporting company, start with its latest Form 10-K, latest Form 10-Q, and any relevant Form 8-K filed since the latest quarterly or annual report. Read the business description, financial statements and notes, management’s discussion, and risk disclosures together; then consider valuation and how the stock fits your portfolio. These filings help you investigate a company, but they do not establish that its shares are a good buy.
1. Find the latest company filings
Search the company name or ticker in the SEC’s EDGAR database, which provides free public access to company filings. Check the filing dates and the periods covered so you are working with current information rather than an older annual report.
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- Form 10-K: the annual report, with information about the business, risks, management’s discussion and analysis (MD&A), and audited financial statements.
- Form 10-Q: a quarterly report that updates results and risks and includes unaudited quarterly financial statements.
- Form 8-K: a current report used for specified or material events. Review filings since the latest 10-K or 10-Q for developments that may change your understanding of the company.
The SEC’s guide to reading a 10-K or 10-Q explains what these reports contain. Reporting obligations differ for non-U.S. issuers, so an EDGAR review may not capture all relevant disclosures for a foreign company.
2. Understand how the company makes money
Begin with the Business section of the 10-K. Before judging growth or profitability, identify what the company sells, who it serves, and what could affect demand or its ability to operate.
- Identify its main products or services and the markets in which it competes.
- Note important customer, supplier, or other dependencies where the company discloses them.
- Look for relevant regulation, geographic exposure, competition, and seasonal factors.
This context helps you interpret the figures: a change in revenue or costs may mean something different depending on the company’s business and the conditions it describes.
3. Read earnings alongside cash flow and the balance sheet
Use consistent fiscal periods when comparing results. Review revenue, expenses, operating results, and net income in the financial statements, then read the MD&A for management’s explanation of what changed and why. Check that explanation against the cash flow statement and balance sheet, and consult the notes for accounting details that affect how to interpret the reported numbers.
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Do not treat a single quarter or one headline earnings figure as a complete account of the business. An earnings result is more informative when considered alongside cash movements, the company’s financial position, and the explanation in its filing. The SEC’s 10-K and 10-Q guide describes these reports and their main sections.
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4. Use P/E as one valuation lens
The price-to-earnings ratio (P/E) compares a stock’s price with its earnings per share (EPS). Investor.gov describes P/E as the current share price divided by EPS and describes EPS using earnings for the past 12 months divided by common shares outstanding. When looking at a quoted ratio, check the earnings period and basis used; figures based on different periods may not be directly comparable.
P/E can help compare a company’s share price with its earnings or compare companies, but it does not determine fair value on its own. Compare businesses with care, since their operations and circumstances may differ. The SEC does not prescribe a universal fair-value multiple or a numerical P/E threshold for buying; a low ratio does not automatically mean a stock is cheap, and a high one does not automatically mean it is overvalued. See Investor.gov’s P/E ratio explanation.
5. Examine company-specific risks and uncertainty
Read the 10-K’s Risk Factors and MD&A, and review Item 7A, Quantitative and Qualitative Disclosures About Market Risk, where present. Disclosures may discuss exposure to interest rates, currencies, commodities, or equity prices, alongside industry, geographic, and company-specific risks.
Relate those disclosures to the business model and financial statements. A list of risks is not a ranking of their likelihood or impact, so do not assume every listed item is equally serious—or dismiss a risk simply because its description sounds general. The SEC’s filing guide provides context for the sections to examine.
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6. Compare companies on a like-for-like basis
If you are evaluating more than one company, use the same fiscal periods and definitions wherever possible. A comparison should put the numbers in business context rather than letting one ratio decide the result.
| What to compare | What to examine |
|---|---|
| Business | Business model, markets, products or services, and important dependencies. |
| Results | Direction and consistency of revenue, earnings, and cash flow over comparable periods. |
| Financial position | Balance-sheet and financing context visible in each company’s filings. |
| Risks | Disclosed uncertainties and exposures, considered in light of each business. |
| Valuation | Measures such as P/E, with the earnings basis and differences between businesses made explicit. |
No single metric is established as decisive, and the filings do not supply a universal numerical cutoff that makes a company attractive.
7. Consider the stock in your portfolio
Company research cannot determine whether a single stock suits your time horizon, tolerance for loss, or existing holdings. A stock can fall in price, and you can lose money. Investor.gov explains that diversification can reduce overall portfolio risk; it does not remove risk or guarantee a return. See its overview of stocks.
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