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Filing counts on the last weekday of each 2026 month, with prior-year weekday month-ends as controls

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 2026-07-26, from SEC EDGAR Index Gap: the Missing Month-Ends.

as of ranking 8×3read in context →
Filing counts on the last weekday of each 2026 month, with prior-year weekday month-ends as controls — 8 rows by 3 columns, computed from US exchange, SIP and OPRA data.
dfilingsmonth_ends_on
2026-01-304332Saturday
2026-02-277870Saturday
2026-03-3155weekday (the gap day)
2026-04-3034weekday (the gap day)
2026-05-295527Sunday
2026-06-3031weekday (the gap day)
2025-09-303460weekday, full in the prior year
2025-12-312289weekday, full in the prior year
Rows × columns
8 × 3
Period covered
to
Computed
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 Filing counts on the last weekday of each 2026 month, with prior-year weekday month-ends as controls, derived from the stored result.
ColumnTypeRangeNotes
d date 2025-09-30 to 2026-06-30
filings number 31 to 7,870
month_ends_on text 4 distinct values (Saturday, Sunday, weekday (the gap day)…)

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.

the exact SQL behind every number 
SELECT d, filings, month_ends_on FROM (
    SELECT '2026-01-30' AS d, (SELECT uniqExact(accession_number) FROM global_markets.stocks_sec_edgar_index WHERE filing_date = toDate('2026-01-30')) AS filings, 'Saturday' AS month_ends_on, 1 AS ord
    UNION ALL SELECT '2026-02-27', (SELECT uniqExact(accession_number) FROM global_markets.stocks_sec_edgar_index WHERE filing_date = toDate('2026-02-27')), 'Saturday', 2
    UNION ALL SELECT '2026-03-31', (SELECT uniqExact(accession_number) FROM global_markets.stocks_sec_edgar_index WHERE filing_date = toDate('2026-03-31')), 'weekday (the gap day)', 3
    UNION ALL SELECT '2026-04-30', (SELECT uniqExact(accession_number) FROM global_markets.stocks_sec_edgar_index WHERE filing_date = toDate('2026-04-30')), 'weekday (the gap day)', 4
    UNION ALL SELECT '2026-05-29', (SELECT uniqExact(accession_number) FROM global_markets.stocks_sec_edgar_index WHERE filing_date = toDate('2026-05-29')), 'Sunday', 5
    UNION ALL SELECT '2026-06-30', (SELECT uniqExact(accession_number) FROM global_markets.stocks_sec_edgar_index WHERE filing_date = toDate('2026-06-30')), 'weekday (the gap day)', 6
    UNION ALL SELECT '2025-09-30', (SELECT uniqExact(accession_number) FROM global_markets.stocks_sec_edgar_index WHERE filing_date = toDate('2025-09-30')), 'weekday, full in the prior year', 7
    UNION ALL SELECT '2025-12-31', (SELECT uniqExact(accession_number) FROM global_markets.stocks_sec_edgar_index WHERE filing_date = toDate('2025-12-31')), 'weekday, full in the prior year', 8
) ORDER BY ord

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