---
schema_version: "secwatch.filing_event.v1"
accession: "0001558370-24-002044"
form_type: "8-K"
ticker: "NBBK"
cik: "0001979330"
company_name: "NB Bancorp, Inc."
filed_at: "2024-02-29T23:59:59+00:00"
generated_at: "2026-06-05T07:29:44.382616+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# NB Bancorp FY23 adj. net income $34.3M (up 14%); GAAP net income $9.8M on $19.1M foundation contribution

## Summary
- Net income $9.8M vs $30.1M prior year; excluding one-time conversion/IPO costs, adj. net income $34.3M.
- Total assets $4.53B (+26.2% YoY); net loans $3.86B (+29.0%) driven by CRE, C&I, and residential growth.
- Net interest income $130.1M (+23.9% YoY); net interest margin 3.41%, down 8 bps on higher funding costs.
- Book value per share $17.75; tangible book value $17.72; shareholders' equity $758.0M (+120.3% from IPO).
- Allowance for credit losses 0.83% of loans; non-performing loans $10.8M, down from $12.9M at year-end 2022.

## SEC filing metadata
- accession: 0001558370-24-002044
- form_type: 8-K
- ticker: NBBK
- cik: 0001979330
- company_name: NB Bancorp, Inc.
- filed_at: 2024-02-29T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1979330/000155837024002044/0001558370-24-002044-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1979330/000155837024002044/nbbk-20240228x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001558370-24-002044
- JSON: https://secwatch.observer/filing/0001558370-24-002044.json
- Plain text: https://secwatch.observer/filing/0001558370-24-002044.txt

## Key facts
- Earnings Releases
  NB Bancorp, Inc. reported the year ended December 31, 2023 results: net income $9.8 million.
  - Period: the year ended December 31, 2023
  - Net income: $9.8 million
  - Result: reported results
  source text: net income of $9.8 million for the year ended December 31, 2023
  evidence_url: https://www.sec.gov/Archives/edgar/data/1979330/000155837024002044/0001558370-24-002044-index.htm

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