---
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"
generated_at: "2026-05-16T19:57:01.550692+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# NB Bancorp and Provident Bancorp close merger effective Nov 15, 2025; PVBC delisted

## Summary
- 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.

## SEC filing metadata
- 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
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- 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

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-112627
- JSON: https://secwatch.observer/filing/0001104659-25-112627.json
- Plain text: https://secwatch.observer/filing/0001104659-25-112627.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.