10-K vs 10-Q: What's the Difference?

A 10-K is a public company’s comprehensive, audited annual report filed with the U.S. Securities and Exchange Commission; a 10-Q is its shorter, unaudited quarterly report filed for each of the three quarters between annual reports. Both are mandatory disclosures for companies with publicly traded stock, and together they’re the primary paper trail investors use to understand a company’s actual financial condition, independent of whatever the company says in a press release or on an earnings call.

What a 10-K contains

The 10-K is the most detailed disclosure a public company files in a given year. It typically includes:

• Business overview — what the company does, its segments, competitive landscape, and strategy.
• Risk factors — a lengthy, company-drafted list of things that could hurt the business, from competition to regulation to supply chain dependencies. These are written broadly and defensively, but changes year over year are often informative.
• Management’s Discussion and Analysis (MD&A) — management’s own narrative explaining the numbers: why revenue moved, what drove margin changes, and what they expect going forward.
• Audited financial statements — the income statement, balance sheet, cash flow statement, and accompanying footnotes, reviewed and certified by an independent external auditor.
• Executive compensation and governance — pay structures, equity grants, and board composition, though much of this detail also appears in a separate proxy statement.

Because the financials are externally audited, a 10-K carries a higher assurance standard than any other routine filing — it’s the version of the numbers that’s had outside scrutiny applied to it.

What a 10-Q contains

A 10-Q covers the same general categories — financial statements and an MD&A section — but scoped to a single quarter, and without the full annual report’s depth. Critically, the financial statements in a 10-Q are unaudited: they’re reviewed by an external auditor under a lighter-touch standard, not fully audited the way the annual figures are. Risk factors and business descriptions are usually included only as updates to what was already disclosed in the most recent 10-K, rather than restated in full.

Comparing the two

	10-K	10-Q
Frequency	Once a year	Three times a year (Q1, Q2, Q3)
Audit status	Fully audited	Unaudited (reviewed, not audited)
Depth	Comprehensive — full business, risk, and governance detail	Abbreviated — focused on the quarter’s numbers and material changes
Typical filing deadline	60–90 days after fiscal year end, depending on company size	40–45 days after quarter end, depending on company size
Fourth quarter	Covered within the 10-K, not a separate 10-Q	N/A — no 10-Q is filed for Q4

Note there’s no separate 10-Q for the fourth quarter — its results are folded into the annual 10-K, which is one reason full-year 10-K numbers can’t simply be derived by summing four quarters of standalone 10-Q data.

Why the audit distinction matters

An audit means an independent accounting firm has examined the company’s financial records and internal controls and issued an opinion on whether the statements fairly represent the company’s financial position under applicable accounting standards. A quarterly review is a lighter procedure — auditors perform analytical checks and inquiries, but don’t do the full substantive testing an annual audit requires. This is why the annual numbers in a 10-K are treated as the more authoritative source, and why restatements, when they happen, are more likely to surface around annual audit season than during a quarter.

Where these filings fit alongside other disclosures

10-Ks and 10-Qs are periodic disclosures — filed on a fixed schedule regardless of what’s happening at the company. They’re distinct from an 8-K, which is filed on an as-needed basis to disclose specific material events (a CEO departure, an acquisition, a major legal settlement) as they occur, and from a company’s IPO prospectus, which is a one-time filing made before a company goes public rather than a recurring one. Together with the proxy statement covering executive pay and shareholder votes, these filings form the backbone of what a public company is legally required to tell investors, as opposed to what it chooses to say in an earnings call or investor presentation.

How investors actually use them

Analysts and serious investors read past the headline numbers already reported in earnings coverage and go to the MD&A and footnotes directly — that’s where the detail lives on things like debt maturities, contingent liabilities, segment-level performance, and management’s own framing of risks. Comparing the risk factors section across successive 10-Ks, for instance, is a common way to spot what a company is newly worried about, since boilerplate language tends to persist while genuinely new risks get added deliberately. This kind of filing-level analysis complements, rather than replaces, metrics like the P/E ratio or free cash flow that get calculated from the numbers these filings disclose.

The takeaway

A 10-K is the annual, fully audited deep-dive into a public company’s business and financials; a 10-Q is the quarterly, unaudited check-in that covers the same ground in less depth, filed three times a year with the fourth quarter folded into the next 10-K. Both are mandatory SEC filings rather than marketing material, which is exactly why serious analysis of a company usually starts there rather than with its press releases.