Most-filed 13D names of the last 18 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 2026-08-22, from Schedule 13D vs 13G: Rules and Deadlines.

Rows × columns

4 × 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

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.

SELECT
    ticker,
    any(issuer_name)                AS issuer,
    countIf(form_type = 'SC 13D')   AS initial_13d,
    countIf(form_type = 'SC 13D/A') AS amendments
FROM global_markets.stocks_sec_edgar_index
WHERE form_type LIKE 'SC 13D%'
  AND filing_date >= today() - 548
  AND filing_date <  today()
  AND ticker != ''
  AND ticker NOT IN ('SPCX')
GROUP BY ticker
ORDER BY (initial_13d + amendments) DESC, ticker
LIMIT 12