For: Immediate Release Contact: Brett Bauer October 22, 2026 574-235-2000 1st Source Corporation Reports Record Third Quarter Results, Cash Dividend Declared QUARTERLY HIGHLIGHTS Exhibit 99.1 South Bend, IN - 1st Source Corporation (NASDAQ: SRCE), parent company of 1st Source Bank, today reported record quarterly net income of $49.54 million for the third quarter of 2026, up 4.20% compared to $47.54 million reported in the previous quarter and up 17.13% compared to $42.30 million in the third quarter a year ...