Byline Bancorp, Inc. and Illinois State Bancorp, Inc. Announce Definitive Merger Agreement

Roberto R. Herencia, Executive Chairman and Chief Executive Officer of Byline Bancorp, Inc.

“This partnership represents another meaningful step in Byline's growth strategy and further strengthens our position in the Chicago market. Illinois State Bancorp has developed deep customer relationships and a strong community banking franchise. Together, we will be well-positioned to continue delivering the local decision-making, personalized service, and financial expertise our customers value while advancing our goal of becoming the preeminent commercial bank in Chicago.”

Alberto J. Paracchini, President of Byline Bancorp, Inc.

“At Byline, we have always believed that successful partnerships begin with shared values, strong cultures, and a common commitment to serving customers and communities. Illinois State Bancorp embodies those qualities and has established an outstanding reputation across the markets it serves”

Alberto J. Paracchini, President of Byline Bancorp, Inc.

“We are pleased to add this high-quality and complementary Chicago-area franchise, which enhances our presence in attractive markets, expands our customer reach, and adds a stable core deposit base. We believe this partnership will drive sustainable growth, enhance long-term stockholder value, and reinforce our commitment to the local markets and communities we proudly serve.”

Florian J. Barbi, Chairman, President and Chief Executive Officer of Illinois State Bancorp, Inc.

“When evaluating the future of our franchise, it was critical to identify a partner that would preserve the values and customer-focused culture that define Illinois State Bancorp. We found that partner in Byline, whose strong Chicago market presence, relationship-driven approach to banking, commitment to local decision-making, and continued investment in technology, innovation, and fraud management closely align with our vision for the future. We believe this partnership will create meaningful opportunities for our customers, employees, and communities while building on the strengths of both organizations.”