Isabella Bank Corporation (NASDAQ: ISBA) is a Michigan-based bank holding company that operates through its subsidiary, Isabella Bank, providing commercial banking, retail banking, and wealth management services. The corporation generates revenue primarily through net interest income on loans and deposits, with noninterest income from wealth management and mortgage servicing operations. Total assets were $2,209,448 thousand as of December 31, 2025, an increase of 5.9% from December 31, 2024, driven by loan growth, increased bank-owned life insurance policies, and appreciation in available-for-sale securities. Noninterest expenses for the year ended December 31, 2025 were $54,950 thousand. The corporation competes with banks and other financial institutions for deposits and lending relationships across its Michigan markets. The Board declared regular quarterly cash dividends as of the filing date, and a share repurchase plan was amended on April 30, 2025, authorizing an additional 500,000 shares for repurchase.

Revenue model

Net interest income from loans and deposits is the primary revenue driver, with noninterest income from wealth management services, mortgage origination, and mortgage servicing rights providing supplementary revenue streams.

Products and services

Commercial and retail banking, deposit accounts, loans, wealth management and trust services, mortgage origination and servicing, bank-owned life insurance (BOLI) policies, available-for-sale investment securities portfolio.

Customers and end markets

Retail deposit customers, commercial borrowers, trust and wealth management clients across Michigan markets. Deposit base is a primary funding source, with trust clients providing a significant portion of deposits.

Value-chain role

Community bank holding company operating as a deposit-funded lender and wealth manager, sitting between depositors and borrowers and between investment clients and capital markets.

Geographic exposure

Michigan-focused operations, regulated by the Michigan Department of Insurance and Financial Services (DIFS) and the Federal Reserve Board.

Competitors

Banks and other financial institutions competing for deposits and loans in Michigan markets

Source: SEC 10-K, filed 2026-03-13

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