Exhibit 99.1 Contact: Cass Investor Relations ir@cassinfo.com October 23, 2025 Cass Information Systems reports Third Quarter 2025 Results ST. LOUIS – Cass Information Systems, Inc. (Nasdaq: CASS) (the Company or Cass) today reported its third quarter 2025 earnings as follows: | ($ in thousands, except per share data) | | | | | Three Months Ended | | | | | | | Nine Months Ended | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | 9/30/25 | | 6/30/25 | | 3/31/25 | | 1 ...