When annual filings land: 10-K filings by calendar month, three years
Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-10-09, from How to Read a 10-K Annual Report Filing.
| month | month_name | filing_count | share_of_filings_pct |
|---|---|---|---|
| 1 | January | 286 | 1.6 |
| 2 | February | 5600 | 31 |
| 3 | March | 7854 | 43.4 |
| 4 | April | 1255 | 6.9 |
| 5 | May | 463 | 2.6 |
| 6 | June | 414 | 2.3 |
| 7 | July | 298 | 1.6 |
| 8 | August | 361 | 2 |
| 9 | September | 464 | 2.6 |
| 10 | October | 280 | 1.5 |
| 11 | November | 442 | 2.4 |
| 12 | December | 375 | 2.1 |
- Rows × columns
- 12 × 4
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
month |
number | 1 to 12 | |
month_name |
text | 12 distinct values (April, August, December…) | |
filing_count |
number | 280 to 7,854 | count |
share_of_filings_pct |
number | 1.5 to 43.4 | percent |
Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on , and the query below is what returned them.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
WITH annual_filings AS (
SELECT
toMonth(filing_date) AS filing_month,
arrayElement(
['January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December'],
toUInt8(toMonth(filing_date))
) AS month_name,
accession_number AS accession_number
FROM global_markets.stocks_sec_edgar_index
WHERE form_type = '10-K'
AND filing_date >= '2023-10-01'
AND filing_date < '2026-10-01'
)
SELECT
filing_month AS month,
any(month_name) AS month_name,
uniqExact(accession_number) AS filing_count,
round(100.0 * uniqExact(accession_number) / (SELECT uniqExact(accession_number) FROM annual_filings), 1) AS share_of_filings_pct
FROM annual_filings
GROUP BY filing_month
ORDER BY filing_month
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