Start with the company behind the stock
A stock is an ownership interest in a company. Its market price can rise or fall, and shareholders can lose money. A strong business and an attractive investment are different questions: even a successful company can disappoint investors if its price already assumes exceptional growth.
Write a one-sentence business description before looking at a chart. Identify the customer, the product and the reason a customer pays. If the company has several segments, describe each separately. This gives later figures a useful context: revenue growth means more when you understand what produced it.
Source references: Investor.gov — Stocks
Separate a market benchmark from your company
A stock index tracks a defined group of securities under its own methodology. The S&P 500, for example, measures large U.S. companies and uses float-adjusted market-capitalization weighting. Larger constituents therefore have more influence on its movement. An index headline does not describe every stock or every investor’s portfolio.
Use a relevant benchmark to frame a question, then investigate the company itself. If your stock moves differently from a broad index, check company announcements, sector developments and the comparison period before assigning a cause. A shared direction alone does not establish why prices changed.
Source references: S&P Dow Jones Indices — S&P 500
Build a small library of primary documents
Start with the annual filing, then check subsequent updates. A Form 10-K includes business information, risks, management discussion and financial statements. A Form 10-Q provides quarterly financial information and updates. Current reports on Form 8-K disclose specified material events. Foreign issuers may use different forms, including 20-F and 6-K.
Save the document date, reporting period and relevant section beside each note. An earnings presentation is useful context, but trace important accounting figures back to the filing and its notes. Management expectations should remain clearly labeled as expectations.
| Research question | Where to begin | What to record |
|---|---|---|
| How does the business earn money? | Business and segment descriptions | Products, customers and revenue drivers |
| What changed this period? | Management discussion and financial statements | Period, comparison basis and explanation |
| What could weaken the outlook? | Risk factors and subsequent disclosures | Specific exposure and what would make it worse |
| Can accounting profit become cash? | Cash-flow statement and supporting notes | Operating cash flow, investment needs and timing |
Source references: Investor.gov — How to Read a 10-K/10-Q · Investor.gov — Using EDGAR to Research Investments
Compare figures on the same basis
Our comparison worksheet starts with definitions. Record whether a figure covers a quarter, fiscal year or trailing twelve months; whether it is reported or forecast; and whether it applies to the entire company or one share. Keep company-adjusted measures separate from GAAP measures and read the reconciliation.
For a simple hypothetical example, a $40 share price divided by $2 of annual earnings per share gives a price-to-earnings ratio of 20. If a forecast instead uses $2.50 of earnings, the resulting ratio is 16. The lower number comes from a different assumption, not a change in today’s share price. Neither calculation establishes what the shares should be worth.
- Revenue: What grew, and was the change organic, acquired or affected by currency?
- Profitability: Are margins improving for reasons likely to continue?
- Cash and debt: What must the business fund, and when do obligations come due?
- Share count: Does dilution change the growth available to each share?
- Valuation: Which earnings or cash-flow assumption supports the comparison?
Read the clock beside a market price
NYSE’s core trading session runs from 9:30 a.m. to 4 p.m. Eastern Time. Holidays, early closes and other sessions require checking the exchange calendar. Use Eastern Time explicitly rather than assuming a fixed difference from your own time zone.
A price is incomplete without its timestamp, source and session. Confirm whether it is delayed, adjusted for corporate actions or from extended trading before comparing it with another quote. A page’s publication date and the underlying market-data timestamp answer different questions.
Source references: NYSE — Holidays and Trading Hours
Finish with a research note you can revisit
Use this outline to make your thinking inspectable. Keep verified facts separate from your interpretation, and leave unknowns visible. The goal is a clearer question and a record you can update when new evidence arrives.
Company research also sits inside a broader investment decision. Diversification considers how holdings work together; owning several companies exposed to the same demand cycle may leave a shared risk. This guide does not assess your finances, time horizon or suitability for any investment.
- Business: In one sentence, explain who pays the company and why.
- Evidence: List three material facts with their document dates and locations.
- Assumptions: Write what would need to happen for your interpretation to hold.
- Risks: Identify evidence that would change your view.
- Next review: Name the filing or event that would resolve an open question.
Source references: Investor.gov — Asset Allocation and Diversification
Sources & corrections
Use the linked primary sources to check definitions and company disclosures. Filings and service details can change; verify the relevant period before relying on a figure.
- Investor.gov — Stocks
- S&P Dow Jones Indices — S&P 500
- Investor.gov — How to Read a 10-K/10-Q
- Investor.gov — Using EDGAR to Research Investments
- NYSE — Holidays and Trading Hours
- Investor.gov — Asset Allocation and Diversification
Found an error? Send a correction with the page, the claim and a supporting source. These guides provide general education; they do not assess your financial circumstances or recommend a trade. Read our research disclosures.