The most-amended SEC forms: /A filings, trailing 12 months

Name: The most-amended SEC forms: /A filings, trailing 12 months
Creator: Strasmore
Published: 2026-08-22
License: https://www.strasmore.com/terms/

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 2026-08-22, from The Most Common SEC Filings, Explained by Data.

as of 2026-08-22 ranking 8×4read in context →

The most-amended SEC forms: /A filings, trailing 12 months — 8 rows by 4 columns, computed 2026-08-22 from US exchange, SIP and OPRA data.
amended_form	amendments	amendments_display	pct_of_amendments
SCHEDULE 13G/A	33916	33,916	35.5
D/A	21990	21,990	23
SCHEDULE 13D/A	8421	8,421	8.8
40-APP/A	8095	8,095	8.5
4/A	5202	5,202	5.4
S-1/A	1631	1,631	1.7
8-K/A	1428	1,428	1.5
3/A	1328	1,328	1.4

Rows × columns: 8 × 4
Computed: 2026-08-22
Completeness: No missing values
Source: US exchange, SIP and OPRA market data
Licence: Strasmore terms · free, no signup
Formats: JSON · CSV · the SQL below

What each column holds

Column definitions for The most-amended SEC forms: /A filings, trailing 12 months, derived from the stored result.
Column	Type	Range	Notes
`amended_form`	text	8 distinct values (3/A, 4/A, 40-APP/A…)
`amendments`	number	1,328 to 33,916
`amendments_display`	text	8 distinct values (1,328, 1,428, 1,631…)
`pct_of_amendments`	number	1.4 to 35.5	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 2026-08-22, and the query below is what returned them.

the exact SQL behind every number

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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