Start with the company’s Form 10-Q and compare the current fiscal quarter with the same fiscal quarter a year earlier. Then compare year-to-date results with the prior-year period. Read the income statement alongside the balance sheet, cash flow statement, notes and management’s discussion and analysis (MD&A): a revenue or earnings change alone cannot show what drove it, whether cash followed, or whether the periods are truly comparable.
Which periods and filings should you compare?
For a U.S. domestic public company, the Form 10-Q is the main quarterly filing. It contains unaudited financial statements for the prior three months and year to date, with corresponding periods from the previous year. Domestic companies file 10-Qs for the first three fiscal quarters; the fourth-quarter comparison is generally made using the annual report and earnings-announcement materials instead. See the SEC’s overview of public companies.
Find the current and matching prior-year filings through EDGAR, the SEC’s free public filing system. Foreign issuers may report on different forms, so this 10-Q workflow applies specifically to domestic issuers.
Use matching fiscal quarters first
Compare, for example, a company’s fiscal third quarter with its fiscal third quarter a year earlier. This helps account for recurring seasonal patterns. Do not assume that fiscal quarters end on March 31, June 30, September 30 and December 31; check the company’s fiscal year and quarter-end dates in its filing.
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Add the year-to-date comparison
The quarter shows the latest three-month period; year-to-date figures show the cumulative result over the fiscal year so far. Compare each with the corresponding prior-year period. If you also compare one quarter with the immediately preceding quarter, treat that as a separate, more seasonality-sensitive view—not as a replacement for the year-over-year comparison.
Use an earnings release as a starting point, not the final record
Companies often announce results in a press release furnished with a Form 8-K. The release can provide a timely summary, but the full statements generally appear in the 10-Q or 10-K. Verify reported figures and explanations in the filing. The SEC’s guide to Form 8-K explains the role of these current reports.
Build a like-for-like comparison
Before calculating changes, make sure the figures use the same currency, units and period length. Note the source page or table for each value, and keep quarterly figures separate from year-to-date figures. A simple table makes mismatches easier to spot:
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| Measure | Current fiscal quarter | Same quarter, prior year | Change |
|---|---|---|---|
| Revenue | Record filing value and units | Record filing value and units | Current minus prior; percentage change if meaningful |
| Operating income | Record filing value and units | Record filing value and units | Current minus prior; percentage change if meaningful |
| Net income and diluted EPS | Record filing values | Record filing values | Calculate separately; do not treat EPS as dollars of total earnings |
| Operating cash flow | Record filing value and units | Record filing value and units | Current minus prior; investigate differences from earnings |
| Cash, borrowings and relevant balances | Record balance-sheet date and values | Record comparable balance-sheet date and values | Compare balances and explain material movement |
Choose measures that fit the business. Depending on the company, useful lines can include gross profit or margin, capital expenditures, segment results, working capital and debt. No single line is a complete verdict.
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Calculate both absolute and percentage change
Absolute change = current-period value − prior-period value. Percentage change = (current-period value − prior-period value) ÷ prior-period value × 100. State the units and identify the prior period as the denominator. For example, if revenue rises from $100 million to $110 million, the absolute change is $10 million and the percentage change is 10%.
A percentage can mislead when the prior value is zero, negative, unusually small or distorted by a one-off event. In those cases, explain the absolute movement and why a percentage comparison does not convey it reliably; do not present a mathematically possible rate as if it were an informative growth measure.
Read the statements together
Income statement: what changed in reported performance?
Review revenue, costs, operating income, net income and diluted earnings per share (EPS). A higher revenue figure does not by itself establish stronger profitability, and higher net income does not show how much cash the business generated.
Cash flow statement: did earnings turn into cash?
Compare operating cash flow with earnings and review capital expenditures where relevant. If cash generation moves differently from reported income, use the cash flow statement, notes and MD&A to look for disclosed explanations rather than assuming a cause.
Balance sheet: what happened to liquidity and financing?
Check cash, borrowings, working capital and other material balances. The balance sheet reports amounts at a point in time, so compare the dates explicitly and read changes alongside the period’s cash flows and earnings.
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Notes and MD&A: what does the filing say is behind the movement?
MD&A discusses material changes, known trends and uncertainties; the notes give detail on accounting policies, estimates and specific items. Look for disclosed effects of volume, pricing, costs, acquisitions or divestitures, foreign exchange, restructuring, impairment, tax, litigation, accounting changes and seasonality where relevant. Keep a distinction between a reported change and management’s explanation of it. The SEC’s guide to reading a 10-K or 10-Q describes these filing sections and their purpose.
Keep GAAP and adjusted results distinct
GAAP is the accounting framework used for a company’s reported financial statements. A company may also present non-GAAP measures such as adjusted earnings or adjusted EBITDA, but those measures do not conform to GAAP. Treat them as supplementary: identify the closest GAAP measure, read the reconciliation and note what items were excluded. Consider whether the company applies adjustments consistently across periods; an adjusted figure is not automatically a better measure simply because it excludes costs. The SEC explains generally accepted accounting principles (GAAP).
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| Comparison | What it helps show | What to keep in mind |
|---|---|---|
| Same fiscal quarter, year over year | How a quarter compares with the same seasonal period a year earlier | It does not show the full year’s cumulative performance |
| Year to date, year over year | How cumulative results compare over the fiscal year so far | It can mask a recent change within the latest quarter |
| Sequential quarter over quarter | Whether results have recently accelerated or weakened | Seasonality, quarter length and fiscal-calendar effects can make periods less comparable |
| Reported versus adjusted | How management’s supplementary measure differs from GAAP results | Inspect the reconciliation and exclusions before interpreting the adjusted figure |
| Earnings versus cash | Whether cash flow is moving in line with income-statement results | Use the cash flow statement and balance sheet to investigate differences |
| Company total versus segments | Whether different businesses show different trends beneath the aggregate | Use segment information when the company reports it |
These are analytical choices, not a regulator-prescribed scorecard. State which comparison you are using and what it does—and does not—tell you.
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Write a conclusion that stays close to the evidence
A useful summary names the period, measure and size of the change, then describes the explanation the filing gives. For instance: “Revenue increased by X% year over year in the fiscal quarter; the company attributed the change to [disclosed driver]. Operating cash flow moved [direction], so the cash-flow statement provides a separate view of the period.” Replace the brackets only with information actually reported in the filing, and distinguish management’s account from your own conclusion.
A quarter’s reported statements are unaudited. The SEC reviews filings for compliance but does not certify them; the SEC’s Investor.gov bulletin How to Read a 10-K/10-Q states, “The SEC does not vouch for the accuracy of a 10-K or 10-Q.” Historical growth or decline alone does not predict future performance, and this comparison method cannot establish whether a stock is fairly valued or suitable for a particular investor.
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