10-K vs 10-Q: What's the Difference Between Annual and Quarterly Reports?
The 10-K and 10-Q are the two backbone financial filings of any US public company. They sound similar but serve different purposes, carry different levels of scrutiny, and reward different reading. Here's how to tell them apart.
The 10-K: the audited annual report
A 10-K is the comprehensive annual report a US public company files with the SEC. It is audited by an independent accounting firm and is the most thorough single document a company produces — covering the business, risk factors, management's discussion and analysis (MD&A), and full financial statements.
The 10-Q: the lighter quarterly update
A 10-Q is filed for each of the first three quarters of the fiscal year. It is unaudited (the auditor reviews but does not fully audit it) and is shorter, focused on updating the financials and any material changes since the last report. There is no fourth-quarter 10-Q — the annual 10-K covers that period.
Filing timelines
Deadlines depend on the company's filer status. Large accelerated filers must file a 10-K within 60 days of fiscal year-end and a 10-Q within 40 days of quarter-end; smaller (non-accelerated) filers get more time — up to 90 days for the 10-K and 45 for the 10-Q.
Sections worth reading first
- Risk Factors — what the company itself says could go wrong (changes year-over-year are telling)
- MD&A — management's own narrative on results, trends and liquidity
- Financial Statements — the income statement, balance sheet and cash-flow statement
- Notes to the financials — where the real detail (and sometimes the red flags) lives
How to use them together
Read the 10-K to understand the business and its risks in depth; use successive 10-Qs to monitor whether the story is playing out as management described. Divergence between the annual narrative and the quarterly reality is often where the most useful signals appear.
Frequently asked questions
Is a 10-Q audited?
No. A 10-Q is unaudited — the independent auditor performs a lighter review rather than a full audit. Only the annual 10-K is fully audited.
Why is there no fourth-quarter 10-Q?
Because the annual 10-K covers the full fiscal year, including the fourth quarter. Companies file 10-Qs for the first three quarters and a 10-K for the year.