{"schema_version":"secwatch.filing_event.v1","accession":"0001104659-25-112627","form_type":"8-K","ticker":"NBBK","cik":"0001979330","company_name":"NB Bancorp, Inc.","filed_at":"2025-11-14T23:59:59+00:00","discovered_at":"2026-05-14T18:02:41.203317+00:00","generated_at":"2026-05-16T19:57:01.550692+00:00","sec_items":["8.01","9.01"],"event_type":"m_and_a","sentiment":"neutral","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"NB Bancorp and Provident Bancorp close merger effective Nov 15, 2025; PVBC delisted","bullets":["All closing conditions satisfied; merger effective shortly after midnight (ET) on November 15, 2025.","Joseph B. Reilly appointed to board of NB Bancorp and Needham Bank, effective at closing.","Conversion of BankProv products and services to Needham Bank scheduled over Nov 15-16 weekend.","Last trading day for Provident (PVBC) common stock was November 14, 2025; delisting follows."],"urls":{"canonical":"https://secwatch.observer/filing/0001104659-25-112627","json":"https://secwatch.observer/filing/0001104659-25-112627.json","markdown":"https://secwatch.observer/filing/0001104659-25-112627.md","text":"https://secwatch.observer/filing/0001104659-25-112627.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1979330/000110465925112627/0001104659-25-112627-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1979330/000110465925112627/tm2531268d1_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T19:57:01.550692+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"}