{"slug":"how-to-read-a-form-4","qid":"amendments","label":"Original Form 4 documents and Form 4/A amendments, by filing month","post_title":"How to Read a Form 4 Insider Trading Filing","post_url":"/blog/how-to-read-a-form-4#q-amendments","columns":["month","original_count","amendment_count","amendment_pct"],"rows":[{"month":"2025-08-01","original_count":11279,"amendment_count":142,"amendment_pct":1.24},{"month":"2025-09-01","original_count":9840,"amendment_count":174,"amendment_pct":1.74},{"month":"2025-10-01","original_count":9322,"amendment_count":98,"amendment_pct":1.04},{"month":"2025-11-01","original_count":10772,"amendment_count":114,"amendment_pct":1.05},{"month":"2025-12-01","original_count":13067,"amendment_count":187,"amendment_pct":1.41},{"month":"2026-01-01","original_count":13813,"amendment_count":187,"amendment_pct":1.34},{"month":"2026-02-01","original_count":21029,"amendment_count":291,"amendment_pct":1.36},{"month":"2026-03-01","original_count":21959,"amendment_count":422,"amendment_pct":1.89},{"month":"2026-04-01","original_count":12850,"amendment_count":254,"amendment_pct":1.94},{"month":"2026-05-01","original_count":19206,"amendment_count":243,"amendment_pct":1.25},{"month":"2026-06-01","original_count":17694,"amendment_count":217,"amendment_pct":1.21},{"month":"2026-07-01","original_count":11033,"amendment_count":189,"amendment_pct":1.68}],"shape":"series","sql":"SELECT\n    toString(toStartOfMonth(filing_date))                                  AS month,\n    uniqExactIf(accession_number, form_type = '4')                         AS original_count,\n    uniqExactIf(accession_number, form_type = '4/A')                       AS amendment_count,\n    round(100 * uniqExactIf(accession_number, form_type = '4/A')\n              / uniqExact(accession_number), 2)                            AS amendment_pct\nFROM global_markets.stocks_form4\nWHERE filing_date >= toDate('2025-08-01')\n  AND filing_date <  toDate('2026-08-01')\n  AND form_type IN ('4', '4/A')\nGROUP BY month\nHAVING uniqExact(accession_number) > 0\nORDER BY month","computed_at":"2026-08-08T15:31:36.199979+00:00","elapsed":0.011448318}