{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-21-251963","form_type":"8-K","ticker":"WMS","cik":"0001604028","company_name":"ADVANCED DRAINAGE SYSTEMS, INC.","filed_at":"2021-08-20T23:59:59+00:00","discovered_at":"2026-05-14T18:04:18.768105+00:00","generated_at":"2026-06-29T08:39:31.814927+00:00","sec_items":["1.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.6,"calibrated_materiality_score":0.6,"confidence":"high","headline":"Advanced Drainage Systems enters shareholder agreement with CPPIB after 3.1M share purchase from Chlapaty trust","bullets":["CPPIB purchased 3.1M shares from Joseph Chlapaty trust; company received no proceeds.","Shareholder Agreement imposes transfer restrictions and standstill obligations on CPPIB's Active Equities Group until later of 2 years or below 5% ownership.","Registration Rights Agreement grants CPPIB demand and piggyback registration rights, subject to $50M minimum and certain limits.","Company waived consent right to CPPIB's acquisition of remaining shares via ROFO.","Standstill limits CPPIB from owning >9.99% without Board consent, up to 20% with consent."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-21-251963","json":"https://secwatch.observer/filing/0001193125-21-251963.json","markdown":"https://secwatch.observer/filing/0001193125-21-251963.md","text":"https://secwatch.observer/filing/0001193125-21-251963.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1604028/000119312521251963/0001193125-21-251963-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1604028/000119312521251963/d192515d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-29T08:39:31.814927+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}