Isabella Bank Corporation ("Isabella") (NASDAQ:ISBA) (the "Company"), the holding company for Isabella Bank, today announced it has been added to the Russell 2000® Index, effective after the U.S. market closed on June 26, 2026.

The Russell 2000® Index measures the performance of approximately 2,000 small-cap U.S. companies and is widely regarded as a leading benchmark for the small-cap segment of the U.S. equity market. Membership in the index is determined primarily by market capitalization and is reconstituted annually.