Buying a share of stock and buying a corporate bond are different transactions. One makes you a part-owner of a business; the other makes you a lender to it. Yet the discipline behind both is remarkably similar: gather the facts, understand the risks, and decide whether the price compensates you for taking them. The ten questions below are designed to work for either investment, which is useful because many people end up considering both forms of a single company’s securities.
Why the same ten questions serve stocks and bonds
The U.S. Securities and Exchange Commission (SEC) requires public companies to disclose financial and other information so that investors can judge for themselves whether to buy, sell, or hold a security. That principle – equal access to basic facts – is the foundation of due diligence for both equities and fixed income.
What changes between the two is emphasis. An equity investor is asking whether profits will grow and whether the share price already reflects that growth. A bondholder is asking whether the company can pay interest on time and return principal at maturity. Some questions matter more in one case than the other, but skipping any of them tends to turn an investment into a guess.
1. Do I actually understand what this business does?
This sounds trivial and often is not. A useful test is to describe the company in one or two plain sentences without borrowing its own marketing language. What does it sell, to whom, and why do customers choose it over alternatives?
Primary filings are the place to start. For U.S. public companies, the annual report on Form 10-K is audited and contains a business overview, a discussion of material risks, and management’s discussion and analysis of results. The quarterly Form 10-Q is unaudited but updates the picture. Both are free to read through the SEC’s EDGAR database, which also holds registration statements, shareholder meeting materials, executive compensation details, and insider transaction records.
If you cannot explain the business in plain language, the research is not finished. That is not a judgment about the company – it is a signal about the state of your own understanding.
2. How does the company earn revenue, and how durable is that revenue?
Revenue quality varies enormously. Recurring subscription income behaves differently from one-off project work. A company that depends on a single customer or a single product carries more concentration risk than one with a broad base.
Look at where growth comes from. Is it driven by higher volumes, higher prices, new markets, or acquisitions? Headline growth assembled through acquisitions is generally considered a different proposition from organic expansion, and the segment notes in a filing usually reveal the difference. A five-year trend tells you more than any single quarter, since one strong period can reflect timing rather than a durable shift.
3. Are reported profits backed by real cash?
Accounting earnings and cash generation are related but not identical. Over time, a healthy business usually converts a substantial share of its net income into operating cash flow and free cash flow. A persistent, widening gap – where reported profit consistently exceeds cash generation – is a common reason analysts dig deeper into revenue recognition, working capital, and accrual practices.
On the cash flow statement, compare operating cash flow with net income across several years. Then look at what the company does with the cash: reinvestment, debt reduction, dividends, or share buybacks. The buyback table in the annual report shows the average price paid per share, which is one of the few capital allocation decisions with an explicit price attached to it.
4. How much debt is on the balance sheet, and can it be serviced?
Leverage is central to both equity and credit analysis. A common measure is net debt relative to EBITDA – earnings before interest, taxes, depreciation, and amortization. Ratios that look manageable in a stable industry can become difficult in a cyclical one, and what matters is the trend over time, not a single year’s snapshot.
Also read the debt schedule and the notes to the financial statements. Maturity dates matter: a company with large borrowings coming due soon faces refinancing risk if credit conditions tighten. Off-balance-sheet obligations such as purchase commitments, operating leases, guarantees, and underfunded pension gaps appear in the footnotes rather than in headline ratios, and for a bondholder they count.
5. What is already priced in?
A strong business can still be a poor investment if the price assumes too much. The most common valuation yardstick for shares is the price-to-earnings (P/E) ratio, which shows how much investors are paying for each dollar of annual profit. Because companies differ in size and share count, ratios make comparison easier; FINRA’s investor education materials describe several widely used measures, including earnings per share, P/E, price-to-sales, and debt-to-equity.
For bonds, the equivalent question is what the yield is compensating you for. A higher yield generally reflects a higher perception of risk, whether from credit quality, maturity, or the bond’s terms. Yields are not a free lunch, and a yield that stands out from comparable issuers deserves a closer look rather than automatic enthusiasm.
6. What legal, regulatory, and industry risks does the company itself disclose?
Every annual report contains a risk factors section, and it is one of the fastest ways to learn what management considers material. The same filing usually has a contingencies note covering litigation and other uncertain obligations, with disclosure thresholds that can leave a gap between the maximum possible exposure stated in the notes and any liability recognized on the balance sheet.
Regulation is a recurring theme because changes to rules can alter a company’s cost base or its competitive position. Investors who want a wider view of how legal and commercial developments are reported across industries sometimes follow general legal sector coverage, though such reporting is best treated as a starting point for further research rather than a substitute for a company’s own disclosures.
7. If this is a bond, what does the credit rating actually measure?
A bond is a debt obligation. Investors who buy corporate bonds are lending money to the issuer, which commits to pay interest and, in most cases, to return principal at maturity. Credit ratings are letter grades issued by rating agencies registered with the SEC as Nationally Recognized Statistical Rating Organizations (NRSROs). Each agency has its own scale, but a common dividing line falls between BBB- and BB: ratings at or above BBB- are generally considered investment grade, while lower ratings are described as non-investment grade, speculative, or high yield.
Ratings are estimates of relative credit risk, not investment advice, and they address creditworthiness alone. They do not capture market risk, liquidity risk, or the price at which a bond is offered. For a step-by-step look at the features that matter, FINRA publishes a bond due diligence guide covering maturity, security provisions, yield, call status, tax treatment, and credit rating.
8. How sensitive is the bond to interest rate moves?
Market interest rates and bond prices generally move in opposite directions. When rates rise, the price of a fixed-rate bond typically falls, and when rates fall, it typically rises. This is known as interest rate risk, and it applies even to bonds backed by the U.S. government.
Maturity and coupon influence how much a price changes. The SEC’s investor education materials explain that longer-dated bonds and lower-coupon bonds are generally more sensitive to rate moves. Duration expresses roughly how much a bond’s value is likely to change for a given change in rates. If you intend to hold a bond to maturity and the issuer pays as agreed, day-to-day price swings may matter less – but if you may need to sell early, they matter a great deal.
9. What are the bond’s terms if something changes?
Read the offering documents, not just the yield. Maturity tells you when principal is due: short term is often defined as under three years, medium term as roughly four to ten years, and long term as more than ten years. A call provision lets the issuer redeem the bond early, often when rates have fallen, which creates reinvestment risk for the holder. Some bonds are secured by specific assets; others are unsecured. Floating-rate and zero-coupon structures change the timing of cash flows entirely.
Ranking also matters. In a bankruptcy, bondholders generally have priority over shareholders in claims on the company’s assets, and among bonds the seniority of each issue can differ. These terms are set out in the indenture and offering materials, and they determine what you actually own.
10. Does this investment fit the rest of my portfolio?
An investment can pass every company-level test and still be unsuitable. Time horizon, ability to absorb loss, and existing exposure all matter. If a large share of your holdings already sits in one sector, adding another company from that sector concentrates rather than diversifies the risk. The SEC notes that diversification and asset allocation are core ways to manage investment risk, and that a single stock or narrowly focused fund may provide neither.
One practical habit is to write down, before buying, the amount you can afford to lose and the condition that would tell you the original thesis is wrong. That written record is what makes a later decision about holding or selling a matter of reasoning rather than reaction.
Stock versus bond due diligence at a glance
| Aspect | Stock (equity) | Corporate bond (debt) |
|---|---|---|
| What you own | Part ownership of the company | A creditor claim on the company |
| How you can earn a return | Share price changes and any declared dividends | Interest payments and return of principal at maturity |
| Position if the issuer fails | Shareholders generally rank below creditors | Bondholders generally have priority over shareholders |
| Primary risks | Business performance, valuation, earnings quality | Default risk, interest rate risk, liquidity risk, call risk |
| Key source documents | 10-K, 10-Q, proxy statement, earnings transcripts | Offering documents, indenture, credit ratings, 10-K debt notes |
| Central question | Will profits grow enough to justify the price? | Will interest and principal be paid as promised? |
Source: SEC Investor.gov bulletins on corporate bonds, credit ratings, and interest rate risk; FINRA investor education. Figures and definitions reflect the sources as published and are subject to change.
How to verify the answers yourself
Most of these questions can be answered from primary documents. Start with the latest 10-K and 10-Q, then the proxy statement for governance and compensation, then earnings-call transcripts for how management responds to difficult questions. For ratios and market data, public databases and broker tools provide a quick overview, though the underlying filings remain the reference point.
Before working with any firm or professional, the SEC and FINRA both maintain free verification tools. Investor.gov’s Ask and Check resources let you look up registration status, disciplinary history, and business practices, while FINRA’s BrokerCheck covers brokerage firms and brokers. If an offer involves an unregistered entity, that alone is a reason for caution.
Frequently asked questions
Is a bond safer than a stock?
Not automatically. A bond from a financially weak company can be riskier than shares in a stable one. Bonds typically rank ahead of stock in a bankruptcy and offer defined interest payments, but they carry default risk, interest rate risk, and liquidity risk. Low-risk status applies to specific issuers, not to bonds as a category.
What is the single most important document to read first?
For most U.S. public companies, the annual report on Form 10-K is the most efficient starting point. It combines audited financial statements, a description of the business, management’s discussion of results, and the company’s own list of material risks in one filing.
Do credit ratings tell me whether to buy a bond?
No. Ratings estimate relative credit risk and are one input among several. They do not address market, liquidity, or prepayment risk, and they do not consider the price at which a bond is offered. They are best used alongside your own analysis rather than instead of it.
Can a bond lose money even if the issuer does not default?
Yes. If market interest rates rise, the price of an existing fixed-rate bond generally falls, so selling before maturity can produce a loss. Liquidity can also be limited, meaning you may not find a buyer at the price you want.
What is duration, in plain terms?
Duration is a measure of how sensitive a bond’s price is to changes in market interest rates. Higher duration means greater sensitivity, which generally means larger price swings when rates move. Longer maturity and lower coupon are common reasons a bond has higher duration.
How often should I revisit my research?
Revisiting after each earnings report, and after any material filing, acquisition, capital raise, or change in the forces that drive the business, is a common approach. What matters is comparing the new information with the reasons you originally invested, and recording what changed.
How this article was put together
This guide draws on investor education material published by the SEC’s Office of Investor Education and Advocacy and by FINRA, including the SEC bulletins on corporate bonds, credit ratings, and interest rate risk, and FINRA’s guides to stock and bond due diligence. Definitions of maturity bands, the investment-grade boundary, and the relationship between interest rates and bond prices reflect those sources. The article is general information, not personalized investment advice, and it does not account for any individual’s circumstances. Rating scales, tax treatment, and market conditions change over time, so figures and definitions should be rechecked against current official sources before being relied on.
