The most-amended SEC forms: /A filings, trailing 12 months
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 2026-10-04, from The Most Common SEC Filings, Explained by Data.
| amended_form | amendments | amendments_display | pct_of_amendments |
|---|---|---|---|
| SCHEDULE 13G/A | 33850 | 33,850 | 36.1 |
| D/A | 22685 | 22,685 | 24.2 |
| SCHEDULE 13D/A | 8299 | 8,299 | 8.9 |
| 40-APP/A | 6090 | 6,090 | 6.5 |
| 4/A | 5363 | 5,363 | 5.7 |
| S-1/A | 1514 | 1,514 | 1.6 |
| 8-K/A | 1420 | 1,420 | 1.5 |
| 3/A | 1303 | 1,303 | 1.4 |
- Rows × columns
- 8 × 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 |
|---|---|---|---|
amended_form |
text | 8 distinct values (3/A, 4/A, 40-APP/A…) | |
amendments |
number | 1,303 to 33,850 | |
amendments_display |
text | 8 distinct values (1,303, 1,420, 1,514…) | |
pct_of_amendments |
number | 1.4 to 36.1 | 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.
SELECT form_type AS amended_form,
count() AS amendments,
reverse(arrayStringConcat(extractAll(reverse(toString(count())), '[0-9]{1,3}'), ',')) AS amendments_display,
round(100.0 * count() / (SELECT countIf(endsWith(form_type, '/A')) FROM global_markets.stocks_sec_edgar_index WHERE filing_date >= today() - INTERVAL 12 MONTH AND filing_date < today()), 1) AS pct_of_amendments
FROM global_markets.stocks_sec_edgar_index
WHERE filing_date >= today() - INTERVAL 12 MONTH AND filing_date < today()
AND endsWith(form_type, '/A')
GROUP BY form_type
ORDER BY amendments DESC
LIMIT 8
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