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NB Bancorp, Inc. (NBBK) Fundamental Analysis & AI Grade 2026

NBBK Nasdaq Savings Institutions, Not Federally Chartered CIK: 0001979330
Updated This Month • Analysis: May 9, 2026 • SEC Data: 2026-03-31
Combined AI Grade
B
69% Confidence
STRONG AGREEMENT
B
70% Conf
B
68% Conf

📊 NBBK Key Takeaways

Revenue: $105.7M
Net Margin: 14.2%
Free Cash Flow: $25.3M
Current Ratio: N/A
Debt/Equity: 0.00x
EPS: $0.36
AI Grade: B with 70% confidence
NB Bancorp, Inc. (NBBK) receives a B fundamental grade with 69% confidence from our AI analysis based on SEC 10-K filings. With revenue of $105.7M, net profit margin of 14.2%, and return on equity (ROE) of 1.8%, NB Bancorp, Inc. demonstrates mixed fundamentals in the Finance sector. Below is our complete NBBK stock analysis for 2026.

Is NB Bancorp, Inc. (NBBK) a Good Investment?

Claude

NB Bancorp exhibits exceptional 70% YoY revenue growth and robust 23.9% free cash flow margin, demonstrating operational scale. However, flat net income despite explosive revenue growth combined with critically depressed ROE (1.8%) and ROA (0.2%) indicate severe capital efficiency problems well below banking industry standards, suggesting either asset quality concerns or unsustainable growth strategies.

ChatGPT

NB Bancorp shows robust balance sheet strength with high liquidity and no long-term debt, alongside strong free cash flow and a sizable revenue increase. However, flat net income despite 70% revenue growth and subdued ROE/ROA indicate profitability and efficiency challenges that need to improve. Await clearer translation of growth into earnings and better returns before a more constructive stance.

NB Bancorp, Inc. Key Strengths (NBBK)

Claude
  • + Exceptional revenue growth of 70% year-over-year demonstrates strong market expansion
  • + Strong free cash flow generation at $25.3M with 23.9% FCF margin relative to revenue
  • + Fortress balance sheet with zero debt burden (0.00x debt-to-equity) and $375.4M cash position
  • + Healthy operating margin of 19.3% showing operational leverage capability
  • + EPS growth of 25.2% suggests active capital management through potential share buybacks
ChatGPT
  • + Strong capital and liquidity (equity ~12% of assets; high cash)
  • + Positive free cash flow with solid 17% FCF margin
  • + Healthy interest coverage and double‑digit operating margin

NBBK Stock Risks: NB Bancorp, Inc. Investment Risks

Claude
  • ! Flat net income (0% YoY growth) despite 70% revenue growth signals margin compression and deteriorating profitability
  • ! Return on Equity of 1.8% is critically depressed; banking peers typically generate 8-15%, indicating shareholder capital is earning substandard returns
  • ! Return on Assets of 0.2% is critically low for banking sector (typical range 0.8-1.5%), indicating severe asset deployment inefficiency
  • ! Interest coverage ratio of 3.8x is below acceptable levels for a financial institution, raising earnings stability concerns
  • ! Potential credit quality deterioration hidden in loan portfolio given low returns without corresponding operational costs disclosure
ChatGPT
  • ! Revenue growth not converting to earnings (flat net income)
  • ! Low ROE (5.9%) and ROA (0.7%) signal subpar profitability
  • ! Potential margin pressure from higher funding costs and credit provisions

Key Metrics to Watch

Claude
  • * Return on Equity trajectory - must sustainably improve toward 8%+ minimum to justify equity ownership
  • * Return on Assets improvement - critical indicator of asset quality and credit loss trends
  • * Net profit margin expansion - whether operating leverage converts revenue growth to earnings
  • * Non-performing loan ratio and charge-off trends - to assess hidden credit deterioration
  • * Net Interest Margin (NIM) - primary profitability driver for banking institutions
ChatGPT
  • * Net interest margin (NIM)
  • * Efficiency ratio (noninterest expense/revenue)

NB Bancorp, Inc. (NBBK) Financial Metrics & Key Ratios

Revenue
$105.7M
Net Income
$15.0M
EPS (Diluted)
$0.36
Free Cash Flow
$25.3M
Total Assets
$7.2B
Cash Position
$375.4M

💡 AI Analyst Insight

The 23.9% free cash flow margin provides substantial flexibility for dividends, buybacks, and strategic investments. The current ratio below 1.0x warrants monitoring of short-term liquidity.

NBBK Profit Margin, ROE & Profitability Analysis

Gross Margin N/A
Operating Margin 19.3%
Net Margin 14.2%
ROE 1.8%
ROA 0.2%
FCF Margin 23.9%

NBBK vs Finance Sector: How NB Bancorp, Inc. Compares

How NB Bancorp, Inc. compares to Finance sector averages

Net Margin
NBBK 14.2%
vs
Sector Avg 25.0%
NBBK Sector
ROE
NBBK 1.8%
vs
Sector Avg 12.0%
NBBK Sector
Current Ratio
NBBK 0.0x
vs
Sector Avg 1.2x
NBBK Sector
Debt/Equity
NBBK 0.0x
vs
Sector Avg 2.0x
NBBK Sector

Sector benchmarks are approximate industry averages. Actual sector performance may vary.

Is NB Bancorp, Inc. Stock Overvalued? NBBK Valuation Analysis 2026

Based on fundamental analysis, NB Bancorp, Inc. has mixed fundamental signals relative to the Finance sector in 2026.

Return on Equity
1.8%
Sector avg: 12%
Net Profit Margin
14.2%
Sector avg: 25%
Revenue Growth
N/A
Year-over-year
Debt/Equity
0.00x
Sector avg: 2x

Note: This is a fundamental analysis based on SEC filings. For P/E ratio, price targets, and market-based valuation, consult financial data providers. This is not investment advice.

NB Bancorp, Inc. Balance Sheet: NBBK Debt, Cash & Liquidity

Current Ratio
N/A
Quick Ratio
N/A
Debt/Equity
0.00x
Debt/Assets
88.3%
Interest Coverage
3.77x
Long-term Debt
N/A

NBBK Revenue & Earnings Growth: 5-Year Financial Trend

NBBK 5-year financial data:
Revenue
Net Income
EPS (right axis)

5-Year Trend Summary: NB Bancorp, Inc.'s revenue has remained relatively flat over the 5-year period, with a 0% decline. The most recent EPS of $0.23 reflects profitable operations.

NBBK Revenue Growth, EPS Growth & YoY Performance

Revenue Growth
N/A
Year-over-year
Net Income Growth
N/A
Year-over-year
EPS Growth
N/A
Earnings per share
FCF Margin
23.9%
Free cash flow / Revenue

NB Bancorp, Inc. Dividends, Buybacks & Capital Allocation

Operating Cash Flow
$27.3M
Cash generated from operations
Stock Buybacks
$27.8M
Shares repurchased (TTM)
Capital Expenditures
$2.0M
Investment in assets
Dividends Paid
$3.2M
Returned to shareholders

NBBK SEC Filings: Latest 10-K & 10-Q Analysis

Access official SEC EDGAR filings for NB Bancorp, Inc. (CIK: 0001979330)

📋 Recent SEC Filings

Date Form Document Action
May 21, 2026 8-K nbbk-20260521x8k.htm View →
May 18, 2026 4 xslF345X06/rdgdoc.xml View →
May 13, 2026 8-K nbbk-20260512x8k.htm View →
May 8, 2026 10-Q nbbk-20260331x10q.htm View →
Apr 29, 2026 8-K nbbk-20260429x8k.htm View →

Frequently Asked Questions about NBBK

What is the AI rating for NBBK?

NB Bancorp, Inc. (NBBK) has a Combined AI Grade of B from Claude (B) and ChatGPT (B) with 69% combined confidence, based on fundamental analysis of SEC EDGAR filings.

What are NBBK's key strengths?

Claude: Exceptional revenue growth of 70% year-over-year demonstrates strong market expansion. Strong free cash flow generation at $25.3M with 23.9% FCF margin relative to revenue. ChatGPT: Strong capital and liquidity (equity ~12% of assets; high cash). Positive free cash flow with solid 17% FCF margin.

What are the risks of investing in NBBK?

Claude: Flat net income (0% YoY growth) despite 70% revenue growth signals margin compression and deteriorating profitability. Return on Equity of 1.8% is critically depressed; banking peers typically generate 8-15%, indicating shareholder capital is earning substandard returns. ChatGPT: Revenue growth not converting to earnings (flat net income). Low ROE (5.9%) and ROA (0.7%) signal subpar profitability.

What is NBBK's revenue and growth?

NB Bancorp, Inc. reported revenue of $105.7M.

Does NBBK pay dividends?

NB Bancorp, Inc. pays dividends, with $3.2M distributed to shareholders in the trailing twelve months.

Where can I find NBBK SEC filings?

Official SEC filings for NB Bancorp, Inc. (CIK: 0001979330) including 10-K, 10-Q, and 8-K reports are available on SEC EDGAR.

What is NBBK's EPS?

NB Bancorp, Inc. has a diluted EPS of $0.36.

How is the AI analysis conducted?

Two independent AI systems — Claude (Anthropic) and ChatGPT (OpenAI) — analyze SEC EDGAR filings including 10-K annual reports and 10-Q quarterly reports. Each AI evaluates financial health, profitability ratios, balance sheet strength, and growth metrics. The combined grade reflects both perspectives for balanced insights.

What is NBBK's fundamental grade?

Based on our AI fundamental analysis in May 2026, NB Bancorp, Inc. has a B grade with 69% confidence. Review the strengths and risks sections above for full context. This is not investment advice.

Is NBBK stock overvalued or undervalued?

Valuation metrics for NBBK: ROE of 1.8% (sector avg: 12%), net margin of 14.2% (sector avg: 25%). Compare these metrics with sector averages to assess valuation.

What is NBBK's AI grade for 2026?

Our dual AI analysis gives NB Bancorp, Inc. a combined B grade for 2026. Revenue is data pending, with profitability at or below sector average. Always conduct your own research.

What is NBBK's free cash flow?

NB Bancorp, Inc.'s operating cash flow is $27.3M, with capital expenditures of $2.0M. FCF margin is 23.9%.

How does NBBK compare to other Finance stocks?

Vs Finance sector averages: Net margin 14.2% (avg: 25%), ROE 1.8% (avg: 12%), current ratio N/A (avg: 1.2).

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Disclaimer: This analysis is generated by Claude AI (Anthropic) and ChatGPT (OpenAI) based on publicly available SEC EDGAR filings. It does not include stock price data and should not be considered financial advice. All fundamental data is sourced from SEC public domain filings. Always conduct your own research and consult with a qualified financial advisor before making investment decisions.
Data Source: SEC EDGAR | Analysis Date: May 9, 2026 | Data as of: 2026-03-31 | Powered by Claude AI