---
schema_version: "secwatch.filing_event.v1"
accession: "0001558370-25-009259"
form_type: "8-K"
ticker: "NBBK"
cik: "0001979330"
company_name: "NB Bancorp, Inc."
filed_at: "2025-07-16T23:59:59+00:00"
generated_at: "2026-05-18T06:20:17.635613+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# NB Bancorp completes stock repurchase program, repurchased 2M shares at avg $17.96

## Summary
- Under the plan, repurchased 2,028,522 shares (~5% of then-outstanding stock) at avg price $17.96 (incl. commission and excise tax).
- Cumulative repurchases from Jan 22, 2025, through program completion: 4,163,809 shares (9.8% of IPO shares) at weighted avg $18.52.
- Tangible book value per share as of March 31, 2025, was $18.20, near the repurchase average price.
- Share repurchase reflects management's confidence and is accretive to book value per share.

## SEC filing metadata
- accession: 0001558370-25-009259
- form_type: 8-K
- ticker: NBBK
- cik: 0001979330
- company_name: NB Bancorp, Inc.
- filed_at: 2025-07-16T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1979330/000155837025009259/0001558370-25-009259-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1979330/000155837025009259/nbbk-20250715x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001558370-25-009259
- JSON: https://secwatch.observer/filing/0001558370-25-009259.json
- Plain text: https://secwatch.observer/filing/0001558370-25-009259.txt

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