OSBC vs RBB

Key Takeaways

• Old Second Bancorp (OSBC) and RBB Bancorp (RBB) are both U.S. regional banks, but they operate in distinctly different geographic and demographic markets — the Midwest versus Southern California.
• OSBC has recently scaled up through the acquisition of Bancorp Financial (Evergreen Bank Group), which closed in mid-2025, significantly boosting its asset base, loan portfolio, and net interest income.
• RBB has been navigating a multi-quarter credit cleanup, with nonperforming assets (NPAs) declining 34% in fiscal 2025 and classified loans dropping 43%, signaling a normalization of credit quality.
• OSBC boasts a substantially higher net interest margin (NIM) of roughly 5.09% compared to RBB's 2.99%, reflecting different loan mix, pricing power, and funding cost structures.
• RBB returned over $25 million to shareholders in fiscal 2025 through dividends and share repurchases, with a quarterly dividend of $0.16 per share versus OSBC's $0.07 per share.
• Both banks have demonstrated improving fundamentals, but their risk profiles and growth trajectories diverge meaningfully, making this a nuanced comparison for investors weighing profitability against turnaround momentum.

Introduction

Comparing two regional bank stocks such as Old Second Bancorp (OSBC) and RBB Bancorp (RBB) offers a revealing look at how community and regional banks are navigating the current interest rate environment, credit cycles, and competitive landscape. Both institutions serve as essential credit providers in their respective markets, yet they differ significantly in scale, geographic focus, profitability metrics, and near-term catalysts. This stock comparison is relevant for investors who track the banking sector and are evaluating relative performance, growth potential, and risk-adjusted returns in the regional banking space. By examining each bank's recent results, market positioning, and strategic direction, this analysis provides a clear, data-driven picture of where these two financial institutions stand today.

OSBC Overview and Recent Performance

Old Second Bancorp, headquartered in Aurora, Illinois, is the parent company of Old Second National Bank — one of the Chicago area's longest-standing financial institutions, tracing its roots back to 1871. OSBC operates a diversified community banking model offering commercial and consumer loans, deposit services, wealth management, and mortgage products across its branch network. The most transformative development for the bank in recent quarters has been its acquisition of Bancorp Financial, Inc. and its subsidiary Evergreen Bank Group, which closed in July 2025. This transaction added approximately $1.4 billion in assets, significantly expanded the bank's consumer lending capabilities — particularly in the powersports segment — and meaningfully enhanced its competitive position in the Chicago metropolitan market.

In recent market activity, OSBC delivered a standout fourth quarter of 2025, reporting net income of $28.8 million, or $0.54 per diluted share, with adjusted earnings reaching $30.8 million, or $0.58 per share. The bank's net interest margin (NIM) — a key measure of lending profitability — reached an impressive 5.09% on a tax-equivalent basis, placing it well above the regional bank peer average. Return on average tangible common equity (ROATCE), another critical profitability gauge, stood at 16.15% for the quarter. Tangible book value per share grew to $14.12, reflecting a 14% increase over the prior year. The integration of Evergreen Bank has proceeded ahead of management's initial expectations, and CEO Jim Eccher has emphasized that earnings accretion estimates appear conservative as asset yields have exceeded internal projections.

RBB Overview and Recent Performance

RBB Bancorp, based in Los Angeles, California, is the holding company for Royal Business Bank and RBB Asset Management Company. RBB primarily serves the Asian-American business community across Southern California and has built a specialized commercial banking franchise with a heavy emphasis on commercial real estate and residential mortgage lending. The bank's loan portfolio is notably concentrated in non-qualified mortgage (non-QM) residential loans in New York and California, representing roughly 50% of total loans, with an average loan-to-value ratio (LTV) of 54%.

The defining narrative for RBB over the past year has been a determined credit cleanup effort. During fiscal 2025, nonperforming loans decreased by 45% and nonperforming assets declined by 34%. Classified and criticized loans fell 43% year over year, and at the end of the fourth quarter of 2025, stood at $94.4 million. Net income for Q4 2025 reached $10.2 million, or $0.59 per diluted share — more than double the same quarter a year earlier. For the full fiscal year 2025, net income totaled $31.9 million, or $1.83 per diluted share, a 24.5% increase in earnings per share compared to fiscal 2024. Loan growth was solid at 8.6% for the year, supported by $713 million in originations — a 32% increase over 2024. The bank also returned $25.3 million to shareholders through dividends ($0.16 per quarter) and share buybacks, while tangible book value per share rose 7.8% to $26.42. Net interest margin improved steadily throughout the year, ending at 2.99%.

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Head-to-Head Comparison

When placed side by side, OSBC and RBB reveal sharp contrasts in nearly every meaningful category. In terms of profitability, OSBC holds a commanding lead: its net interest margin of 5.09% is roughly 210 basis points wider than RBB's 2.99%, and its ROATCE of 16.15% dwarfs the single-digit returns that RBB has been generating as it works through credit challenges. This margin advantage reflects OSBC's higher-yielding loan mix — enhanced by the Evergreen acquisition — and its relatively lower-cost deposit base in the Midwest.

On the other hand, RBB offers a more compelling shareholder return story in the near term, with a quarterly dividend of $0.16 per share that significantly exceeds OSBC's $0.07 payout. RBB's aggressive share repurchase program — which reduced outstanding shares by approximately 4% in 2025 — further supports per-share metrics. From a risk standpoint, RBB carries a notably higher loan-to-deposit ratio near 99%, which may constrain balance sheet flexibility, whereas OSBC maintains a more conservative ratio following its acquisition. Geographic exposure also diverges: OSBC is anchored in the economically diverse Chicago metro area, while RBB's concentration in Southern California and New York real estate markets introduces different cyclical sensitivities. Both banks maintain solid capital cushions, with OSBC reporting a Common Equity Tier 1 (CET1) capital ratio of 12.99% and RBB operating comfortably above regulatory well-capitalized thresholds.

Tickeron AI Verdict

Based on observable market data and the comparative metrics outlined above, Tickeron's AI-driven analysis would likely favor Old Second Bancorp (OSBC) in the current environment. The combination of a superior net interest margin, a successful and accretive acquisition that is already delivering above-expected results, and a stronger return on tangible equity suggests more consistent trend strength and a higher-quality earnings profile. While RBB Bancorp (RBB) presents an attractive turnaround narrative with improving credit metrics and robust capital returns to shareholders, the lingering credit overhang and tighter liquidity position introduce greater uncertainty. An AI model weighing momentum, profitability, and risk-adjusted stability would therefore assign a higher probability of favorable near-to-medium-term performance to OSBC, while acknowledging that RBB could close the gap if its credit normalization continues at the current pace and net interest margin expansion materializes further.

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