Net interest income reached $32.7 million in 2026Q1, yet the net interest margin remains constrained within a narrow 0.6% to 0.8% range, indicating limited core spread expansion.
| Metric | TTM | Dec'25 | Dec'24 | Dec'23 | Dec'22 | Dec'21 | Dec'20 | Dec'19 | Dec'18 | Dec'17 | Dec'16 | Dec'15 | Dec'14 | Dec'13 | Dec'12 |
|---|
| Net Interest Income | 95.09M | 80.77M | 69.75M | 74.52M | 89.78M | 83.81M | 73.53M | 64.82M | 57.37M | 42.52M | 34.74M | 31.46M | 26.69M | 19.01M | 12.04M |
| NII Growth % | 134.45% | 15.8% | -6.4% | -17% | 7.12% | 13.98% | 13.45% | 12.98% | 34.93% | 22.39% | 10.43% | 17.85% | 40.41% | 57.84% | - |
| Net Interest Margin % | 2.45% | 2.85% | 2.56% | 2.65% | 3.26% | 3.33% | 3.17% | 3.02% | 3.21% | 2.62% | 3% | 3.05% | 3.04% | 2.99% | 3.21% |
| Interest Income | 162.79M | 144.02M | 143.87M | 133.2M | 104.57M | 95.54M | 93.79M | 89.44M | 73.89M | 53.35M | 43.15M | 37.34M | 31.37M | 22.47M | 14.59M |
| Interest Expense | 67.7M | 63.24M | 74.11M | 58.68M | 14.78M | 11.73M | 20.26M | 24.63M | 16.52M | 10.83M | 8.41M | 5.88M | 4.67M | 3.46M | 2.54M |
| Loan Loss Provision | 280K | -3.32M | -3.48M | -2M | 2.92M | 22.89M | 11.16M | 1.91M | 2.57M | 1.54M | 2.08M | 1.86M | 1.63M | 1.03M | 685K |
| Non-Interest Income | 7.46M | 9.47M | 12.66M | 7.86M | 18.61M | 12.45M | 12.13M | 6.23M | 4.22M | 3.69M | 4.2M | 8.33M | 5.86M | 4.45M | 3.63M |
| Non-Interest Income % | 4.38% | 6.17% | 8.09% | 5.57% | 15.11% | 11.53% | 11.45% | 6.51% | 5.4% | 6.47% | 8.87% | 18.24% | 15.73% | 16.52% | 19.9% |
| Total Revenue | 170.24M | 153.49M | 156.52M | 141.06M | 123.18M | 107.99M | 105.93M | 95.67M | 78.11M | 57.03M | 47.35M | 45.67M | 37.23M | 26.92M | 18.21M |
| Revenue Growth % | 42.43% | -1.94% | 10.96% | 14.52% | 14.06% | 1.95% | 10.72% | 22.48% | 36.96% | 20.44% | 3.69% | 22.68% | 38.28% | 47.81% | - |
| Non-Interest Expense | 72.35M | 65.75M | 61.48M | 63.95M | 61.12M | 63.47M | 57.17M | 48.18M | 41.78M | 32.22M | 25.37M | 27.34M | 24.38M | 18.12M | 11.64M |
| Efficiency Ratio | 42.5% | 42.84% | 39.28% | 45.34% | 49.62% | 58.77% | 53.97% | 50.36% | 53.49% | 56.48% | 53.58% | 59.86% | 65.49% | 67.3% | 63.94% |
| Operating Income | 29.92M | 27.81M | 24.41M | 20.43M | 44.35M | 9.91M | 17.34M | 20.96M | 17.24M | 12.45M | 11.49M | 10.58M | 6.54M | 4.32M | 3.34M |
| Operating Margin % | 17.57% | 18.12% | 15.59% | 14.48% | 36% | 9.18% | 16.37% | 21.91% | 22.07% | 21.83% | 24.26% | 23.18% | 17.57% | 16.03% | 18.34% |
| Operating Income Growth % | - | 13.95% | 19.47% | -53.94% | 347.55% | -42.85% | -17.27% | 21.59% | 38.44% | 8.36% | 8.55% | 61.79% | 51.58% | 29.22% | - |
| Pretax Income | 35.08M | 27.89M | 24.41M | 20.43M | 44.35M | 9.91M | 17.34M | 20.96M | 17.24M | 12.45M | 11.49M | 10.58M | 6.54M | 4.32M | 3.34M |
| Pretax Margin % | 20.61% | 18.17% | 15.59% | 14.48% | 36% | 9.18% | 16.37% | 21.91% | 22.07% | 21.83% | 24.26% | 23.18% | 17.57% | 16.03% | 18.34% |
| Income Tax | 6.45M | 4.98M | 4.15M | 3.75M | 8.64M | 1.91M | 3.45M | 4.12M | 3.63M | 4.25M | 3.61M | 3.51M | 1.15M | 1.15M | 979K |
| Effective Tax Rate % | 18.37% | 17.87% | 17.02% | 18.36% | 19.48% | 19.27% | 19.9% | 19.65% | 21.06% | 34.12% | 31.41% | 33.17% | 17.5% | 26.6% | 29.31% |
| Net Income | 28.64M | 22.9M | 20.25M | 16.68M | 35.71M | 8M | 13.89M | 16.84M | 13.61M | 8.2M | 7.88M | 7.07M | 5.4M | 3.17M | 2.36M |
| Net Margin % | 16.82% | 14.92% | 12.94% | 11.82% | 28.99% | 7.41% | 13.11% | 17.6% | 17.42% | 14.38% | 16.64% | 15.49% | 14.5% | 11.77% | 12.96% |
| Net Income Growth % | 31.12% | 13.1% | 21.43% | -53.29% | 346.36% | -42.4% | -17.52% | 23.76% | 65.89% | 4.09% | 11.41% | 31.05% | 70.36% | 34.18% | - |
| Net Income (Continuing) | 28.64M | 22.9M | 20.25M | 16.68M | 35.71M | 8M | 13.89M | 16.84M | 13.61M | 8.2M | 7.88M | 7.07M | 5.4M | 3.17M | 2.36M |
| EPS (Diluted) | 1.92 | 2.08 | 2.05 | 1.69 | 3.50 | 0.76 | 1.27 | 1.66 | 1.39 | 0.96 | 1.10 | 0.97 | 0.93 | 0.44 | 0.33 |
| EPS Growth % | 1.37% | 1.46% | 21.3% | -51.71% | 360.53% | -40.16% | -23.49% | 19.42% | 44.79% | -12.73% | 13.4% | 4.3% | 111.36% | 33.33% | - |
| EPS (Basic) | - | 2.22 | 2.06 | 1.69 | 3.54 | 0.77 | 1.27 | 1.68 | 1.41 | 0.96 | 1.11 | 0.98 | 0.98 | 0.46 | 0.35 |
| Diluted Shares Outstanding | 14.93M | 10.61M | 9.94M | 9.84M | 10.18M | 10.5M | 10.87M | 10.14M | 9.79M | 8.54M | 7.17M | 7.26M | 5.78M | 7.25M | 7.25M |
CRE Concentration and Insurance
According to the provided quarterly data, Investar's net interest income surged to $32.7 million in 2026Q1, representing a significant departure from the $17.5 million to $21.6 million range observed throughout 2024 and 2025, suggesting a potential shift in the bank's core interest-earning asset generation strategy.
The sharp uptick in NII suggests that the bank may have successfully repriced its loan portfolio or benefited from a favorable shift in asset mix despite the broader regional economic headwinds. Investors should monitor whether this growth is sustainable or if it reflects one-time accounting adjustments that could normalize in subsequent quarters.
As reported in financial statements, the net interest margin has remained stubbornly low, fluctuating between 0.6% and 0.8% over the last ten quarters, which indicates that the bank is struggling to expand its interest spread despite the recent volatility in the broader interest rate environment.
The inability to meaningfully expand the NIM suggests that funding costs are likely rising in lockstep with asset yields, potentially due to the competitive nature of the South Louisiana deposit market. This margin compression warrants further investigation into the bank's deposit beta and its ability to retain low-cost core deposits.
Based on the bank's reported figures, the efficiency ratio has hovered between 38.3% and 44.6% over the past two years, demonstrating that Investar maintains a relatively consistent cost structure despite the significant fluctuations in total revenue and the recent negative growth trends observed in the underlying business.
The stability of the efficiency ratio suggests that management has been successful in controlling non-interest expenses, yet the lack of operating leverage implies that the bank's physical branch footprint may be limiting its ability to scale profitably. Investors should consider whether this fixed-cost base will become a burden if revenue growth remains stagnant.
Data from the income statement reveals highly irregular provision expense patterns, including a notable $3.6 million reversal in 2025Q1 and subsequent small charges, which complicates the assessment of the bank's true credit quality and its underlying exposure to the regional commercial real estate market.
The frequent swings in provision expense suggest that management's CECL-based modeling is highly sensitive to shifting economic forecasts, which may obscure the actual performance of the loan book. This volatility warrants further investigation into the specific non-accrual trends within the CRE and construction portfolios to determine if credit risk is being adequately captured.
Based on the most recent quarterly data, the 2026Q1 period appears to be a critical inflection point, as the bank reported a substantial increase in net interest income to $32.7 million, signaling a potential departure from the stagnant revenue environment that characterized the previous eight quarters of operations.
This sudden shift in earnings power may indicate that the bank has successfully integrated recent acquisitions or adjusted its lending focus to capture higher-yielding opportunities. However, given the lack of historical precedent for this level of income, it remains unclear whether this represents a permanent improvement in earnings quality or a transient benefit.
Quick answers to the most common questions about buying ISTR stock.
Investar Holding Corporation (ISTR) is profitable, generating $22.9M in net income for the fiscal year ending 2025 with a net profit margin of 14.9%.
Investar Holding Corporation (ISTR) reported an operating income of $27.8M, resulting in an operating profit margin of 18.1%. This margin reflects the operational efficiency of the business before interest and taxes.
Investar Holding Corporation (ISTR) generated $93.6M in gross profit for the year, representing a gross profit margin of 61.0%. This demonstrates the company's core pricing power and production efficiency.