NBBK achieved a 49.0% growth in net interest income to $64.9M in 2026Q1, though operational scaling remains challenged by an efficiency ratio of 38.1%.
| Net Interest Income | 218.8M | 197.46M | 161.2M | 131.72M | 105.47M | 78.01M |
| NII Growth % | 125.18% | 22.5% | 22.38% | 24.89% | 35.2% | - |
| Net Interest Margin % | 3.03% | 2.82% | 3.13% | 2.91% | 2.94% | 2.67% |
| Interest Income | 364.58M | 335.75M | 292.52M | 222.16M | 121.02M | 90.64M |
| Interest Expense | 145.78M | 138.29M | 131.32M | 90.44M | 15.55M | 12.63M |
| Loan Loss Provision | 9.82M | 4.65M | 12.12M | 13.88M | 6.7M | 2.05M |
| Non-Interest Income | -18.95M | -18.54M | 11.53M | 15.35M | 7.87M | 8.16M |
| Non-Interest Income % | -5.48% | -5.84% | 3.79% | 6.46% | 6.1% | 8.26% |
| Total Revenue | 345.63M | 317.21M | 304.05M | 237.52M | 128.88M | 98.8M |
| Revenue Growth % | 41.7% | 4.33% | 28.01% | 84.29% | 30.45% | - |
| Non-Interest Expense | 116.11M | 103.14M | 101.99M | 121.34M | 70.25M | 56.49M |
| Efficiency Ratio | 33.59% | 32.51% | 33.54% | 51.09% | 54.51% | 57.17% |
| Operating Income | 73.92M | 71.13M | 58.62M | 11.84M | 36.39M | 27.63M |
| Operating Margin % | 21.39% | 22.42% | 19.28% | 4.99% | 28.23% | 27.97% |
| Operating Income Growth % | - | 21.35% | 394.92% | -67.45% | 31.69% | - |
| Pretax Income | 73.92M | 71.13M | 58.62M | 11.84M | 36.39M | 27.63M |
| Pretax Margin % | 21.39% | 22.42% | 19.28% | 4.99% | 28.23% | 27.97% |
| Income Tax | 21.28M | 20.83M | 16.47M | 2.02M | 6.32M | 6.06M |
| Effective Tax Rate % | 28.79% | 29.28% | 28.1% | 17.05% | 17.38% | 21.92% |
| Net Income | 52.63M | 50.3M | 42.15M | 9.82M | 30.07M | 21.57M |
| Net Margin % | 15.23% | 15.86% | 13.86% | 4.14% | 23.33% | 21.84% |
| Net Income Growth % | 14.16% | 19.35% | 329% | -67.32% | 39.35% | - |
| Net Income (Continuing) | 52.63M | 50.3M | 42.15M | 9.82M | 30.07M | 21.57M |
| EPS (Diluted) | 1.27 | 1.32 | 1.07 | 0.23 | 0.70 | 0.51 |
| EPS Growth % | 16.1% | 23.36% | 365.22% | -67.14% | 37.25% | - |
| EPS (Basic) | - | 1.32 | 1.07 | 0.23 | 0.70 | 0.51 |
| Diluted Shares Outstanding | 41.42M | 41.17M | 39.39M | 42.02M | 42.71M | 42.71M |
CRE concentration and liquidity
According to the latest quarterly financial data, NBBK achieved a significant NII expansion to $64.9M in 2026Q1, representing a 49.0% growth rate that suggests the bank is successfully deploying its post-conversion capital base into interest-earning assets despite a highly competitive regional funding environment.
The sharp acceleration in NII suggests that the bank is effectively utilizing its excess liquidity to scale its loan portfolio. Investors should monitor whether this growth is sustainable or if it reflects a temporary surge in asset deployment that may eventually face diminishing returns.
As reported in financial statements, NBBK's net interest margin has remained largely range-bound at 0.9% in 2026Q1, indicating that while the bank is growing its interest-earning assets, it is struggling to expand its spread against rising deposit costs in the Greater Boston market.
The persistent 0.8% to 0.9% NIM range suggests that funding costs are largely offsetting the benefits of asset repricing. This implies that the bank's deposit beta may be higher than anticipated, potentially limiting future profitability expansion unless the asset mix shifts toward higher-yielding commercial credits.
Based on reported figures, NBBK's efficiency ratio reached 38.1% in 2026Q1, a level that appears to reflect the increased overhead associated with operating as a public entity while simultaneously managing the integration of its recent mutual-to-stock conversion capital into the broader operational framework.
The fluctuation in the efficiency ratio suggests that management is still calibrating its cost structure to match its new, larger capital base. Analysts should investigate whether the current expense trajectory is a permanent feature of the public company model or a temporary byproduct of growth-related investments.
Data from the most recent quarter shows a provision expense of $6.3M, which, when compared to historical trends, suggests a more conservative approach to credit risk management as the bank expands its commercial real estate and specialized lending portfolios in a volatile interest rate environment.
The increase in provision expense may indicate management's anticipation of potential credit deterioration within its CRE-heavy loan book. This warrants further investigation into the specific risk-weighting assumptions applied to the bank's niche lending segments, such as cannabis and structured finance, which may carry idiosyncratic risks.
Quick answers to the most common questions about buying NBBK stock.
NB Bancorp, Inc. Common Stock (NBBK) is profitable, generating $50.3M in net income for the fiscal year ending 2025 with a net profit margin of 15.9%.
NB Bancorp, Inc. Common Stock (NBBK) reported an operating income of $71.1M, resulting in an operating profit margin of 22.4%. This margin reflects the operational efficiency of the business before interest and taxes.
NB Bancorp, Inc. Common Stock (NBBK) generated $174.3M in gross profit for the year, representing a gross profit margin of 54.9%. This demonstrates the company's core pricing power and production efficiency.