LOS ANGELES, APRIL 3, 2026 - AMERICAN BUSINESS BANK (OTCQX: AMBZ) (“ABB”) announced that Jon Schlobohm will retire from the Bank’s Board of Directors, effective at the expiration of his current term. “Jon has been a valued member of our Board since 1998, the year the Bank was founded, and we are grateful for his years of dedicated service and thoughtful counsel,” said Leon Blankstein, Chief Executive Officer (CEO), President and Director of ABB.

LOS ANGELES, FEBRUARY 9, 2026 - AMERICAN BUSINESS BANK (OTCQX: AMBZ) (“ABB”) is pleased to announce it has been ranked in the OTCQX Best 50, a ranking of the top performing companies traded on the OTCQX Best market last year, published January 15, 2026.

LOS ANGELES, December 26, 2025- AMERICAN BUSINESS BANK (OTCQX: AMBZ) (the “ABB”) is proud to announce the promotion of Trey Weatherill to Regional Vice President of the Inland Empire Region in Ontario, California.

LOS ANGELES, CA December 19, 2025 - AMERICAN BUSINESS BANK (OTCQX: AMBZ) announces the promotion of Eric Dole and Chris Basirico to Executive Vice President, Corporate Banking. “We are excited about what the future holds for ABB,” said Leon Blankstein, CEO and Director of ABB. “These additions to our already dynamic executive leadership will continue our momentum. Their exemplary performance and commitment to excellence have been evident for years at our organization. Eric and Chris are each consummate professionals, embodying the ABB culture, and desire to see others succeed. I am eager to see their impact as they step into this next role.”

DOWNTOWN RIVERSIDE, CA. SEPTEMBER 2, 2025 - AMERICAN BUSINESS BANK (OTCQX: AMBZ) today is proud to announce the opening of its new Loan Production Office (LPO) in Downtown Riverside. The new office is located at 3801 University Ave., Suite 640 and marks a significant expansion of ABB’s footprint across Southern California. In addition, the Bank has also promoted David R. Valenzuela to Regional Vice President, to lead the new regional LPO office.