10-K vs 10-Q: Annual vs Quarterly SEC Filings

What the 10-K and 10-Q are

The 10-K and the 10-Q are the two core periodic financial reports that U.S. public companies file with the Securities and Exchange Commission. The 10-K is the comprehensive annual report: it covers a full fiscal year and includes audited financial statements, a detailed business description, risk factors, and management's discussion and analysis (MD&A). The 10-Q is a lighter quarterly update, filed for each of the first three fiscal quarters, containing condensed financial statements that are reviewed but not fully audited.

A company does not file a 10-Q for its fourth quarter. Instead, the fourth-quarter results are folded into the annual 10-K, which arrives roughly two to three months after the fiscal year ends. Over a typical year, then, an investor sees three 10-Qs and one 10-K. Both filings are free to the public on SEC EDGAR, and on TENK/calls the standardized figures pulled from them appear on each company's financials page and drive every column in the screener.

How the numbers relate

The key arithmetic link between the two filings is straightforward. A full fiscal year equals the sum of its four quarters:

• Annual revenue (from the 10-K) = Q1 + Q2 + Q3 + Q4 revenue.
• Implied fourth-quarter figure = Annual (10-K) − (Q1 + Q2 + Q3) from the three 10-Qs.
• Trailing twelve months (TTM) = the most recent four consecutive quarters, regardless of where the fiscal year ends.

Because a 10-Q reports a single three-month period (and a year-to-date total), and the 10-K reports twelve months, comparing the two directly without adjusting for length overstates the annual figure or understates the quarterly one. Analysts commonly annualize a quarter (multiply by four) for a rough run-rate, or build a TTM figure by rolling four quarters together so seasonal patterns wash out.

A worked example

Consider a hypothetical unnamed retailer with a December fiscal year-end. Its three 10-Q filings report quarterly revenue of $200M in Q1, $220M in Q2, and $240M in Q3 — a year-to-date total of $660M through nine months. When the 10-K lands, it reports full-year revenue of $1.0B.

• Implied Q4 revenue = $1.0B annual − $660M year-to-date = $340M.
• That fourth quarter is the largest of the year, consistent with a holiday-heavy retailer — a seasonal shape only visible once the 10-K reveals the missing quarter.
• Annualizing Q3 alone ($240M × 4 = $960M) would have understated the true $1.0B because it ignored the seasonal Q4 surge.
• Full-year net income in the 10-K is $80M, an 8 percent net margin ($80M ÷ $1.0B), a figure the reviewed quarterly statements only hinted at.

The same logic applies to the balance sheet, but with a difference: balance-sheet items (cash, debt, inventory) are point-in-time snapshots, so the 10-Q and 10-K each show a fresh reading as of the period-end date rather than something you sum across quarters.

How to read each filing

The 10-K is where investors go for depth and reliability. Its audited statements carry an independent auditor's opinion, its risk-factors section is the fullest disclosure of what could go wrong, and its MD&A explains the year's results in management's own words. Because it is annual, it is the natural unit for year-over-year trend analysis — the basis for the multi-year revenue, margin, and growth histories shown on a company's financials page and the composite quality rankings on the leaderboards.

The 10-Q is where investors go for timeliness. It reveals momentum shifts — accelerating or decelerating revenue, a margin that is compressing, a new risk disclosure — months before the annual report would. Its statements are reviewed rather than audited, a lighter level of assurance, so figures are more likely to be restated or refined later. Filing deadlines scale with company size: large accelerated filers generally have 40 days after quarter-end for a 10-Q and 60 days after year-end for a 10-K, while smaller reporting companies get 45 and 90 days respectively.

Where it can mislead

Treating the two filings as interchangeable is the most common error. Several traps recur:

• Length mismatch: putting a 10-Q's three-month revenue next to a 10-K's twelve-month revenue makes a company look as if it collapsed. Always compare like periods — quarter to quarter, or year to year.
• The invisible fourth quarter: because there is no Q4 10-Q, the fourth quarter must be backed out of the 10-K. Screens or models that only ingest 10-Q data can silently miss a company's biggest or weakest quarter.
• Assurance gap: 10-Q figures are reviewed, not audited. A number that looks precise in a quarterly filing can be revised in the annual audit, so early-quarter reads carry more restatement risk.
• Non-GAAP emphasis: both filings may highlight adjusted metrics (adjusted EBITDA, non-GAAP earnings) in press releases and MD&A, but only the GAAP statements are audited in the 10-K. Anchoring on management's adjusted numbers can overstate profitability.
• Fiscal-year quirks: not every company ends its year in December, and some use 52/53-week calendars, so an occasional fiscal year contains an extra week. That makes naive quarter-to-quarter or year-to-year comparisons slightly apples-to-oranges.

Because TENK/calls standardizes figures from both filing types into a common ten-year history and a trailing-twelve-months view, the length-mismatch and missing-quarter traps are handled before a number reaches the screener column or the financials page — but the underlying distinction between an audited annual report and a reviewed quarterly one is worth keeping in mind whenever a fresh quarter moves a metric.

Frequently asked questions

What is the main difference between a 10-K and a 10-Q?

The 10-K is the audited annual report covering a full fiscal year with complete business, risk, and MD&A disclosure; the 10-Q is a lighter, reviewed (not audited) quarterly report covering three months. Companies file three 10-Qs and one 10-K each year.

Why is there no 10-Q for the fourth quarter?

The fourth quarter is not reported separately. Its results are incorporated into the annual 10-K, so the implied fourth-quarter figure is found by subtracting the three 10-Q year-to-date totals from the full-year numbers in the 10-K.

Are 10-Q financial statements audited?

No. A 10-Q's statements are reviewed by an independent accountant, a lower level of assurance than the full audit in a 10-K. Quarterly figures can therefore be refined or restated when the annual report is audited.