---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-060111"
form_type: "8-K"
ticker: "NBBK"
cik: "0001979330"
company_name: "NB Bancorp, Inc."
filed_at: "2026-05-13T18:00:31+00:00"
generated_at: "2026-05-13T18:01:21.109466+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# NB Bancorp completes stock repurchase; 2.2M shares bought at avg $20.96

## Summary
- Repurchased 2,207,236 shares (~5% of outstanding) at average price $20.96/share.
- Cumulative buybacks since Jan 2025: 6,371,044 shares (16% of IPO shares) at weighted avg $19.25.
- Tangible book value per share was $18.00 as of March 31, 2026.

## SEC filing metadata
- accession: 0001104659-26-060111
- form_type: 8-K
- ticker: NBBK
- cik: 0001979330
- company_name: NB Bancorp, Inc.
- filed_at: 2026-05-13T18:00:31+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1979330/000110465926060111/0001104659-26-060111-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1979330/000110465926060111/nbbk-20260512x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-060111
- JSON: https://secwatch.observer/filing/0001104659-26-060111.json
- Plain text: https://secwatch.observer/filing/0001104659-26-060111.txt

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